Merge tag 'efi-2022-04-rc1-2' of https://source.denx.de/u-boot/custodians/u-boot-efi

[thirdparty/u-boot.git] / lib / fdtdec.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2011 The Chromium OS Authors.
 */

#ifndef USE_HOSTCC
#include <common.h>
#include <boot_fit.h>
#include <dm.h>
#include <hang.h>
#include <init.h>
#include <log.h>
#include <malloc.h>
#include <net.h>
#include <dm/of_extra.h>
#include <env.h>
#include <errno.h>
#include <fdtdec.h>
#include <fdt_support.h>
#include <gzip.h>
#include <mapmem.h>
#include <linux/libfdt.h>
#include <serial.h>
#include <asm/global_data.h>
#include <asm/sections.h>
#include <linux/ctype.h>
#include <linux/lzo.h>
#include <linux/ioport.h>

DECLARE_GLOBAL_DATA_PTR;

/*
 * Here are the type we know about. One day we might allow drivers to
 * register. For now we just put them here. The COMPAT macro allows us to
 * turn this into a sparse list later, and keeps the ID with the name.
 *
 * NOTE: This list is basically a TODO list for things that need to be
 * converted to driver model. So don't add new things here unless there is a
 * good reason why driver-model conversion is infeasible. Examples include
 * things which are used before driver model is available.
 */
#define COMPAT(id, name) name
static const char * const compat_names[COMPAT_COUNT] = {
        COMPAT(UNKNOWN, "<none>"),
        COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"),
        COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"),
        COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"),
        COMPAT(NVIDIA_TEGRA124_XUSB_PADCTL, "nvidia,tegra124-xusb-padctl"),
        COMPAT(NVIDIA_TEGRA210_XUSB_PADCTL, "nvidia,tegra210-xusb-padctl"),
        COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
        COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"),
        COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
        COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"),
        COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"),
        COMPAT(GENERIC_SPI_FLASH, "jedec,spi-nor"),
        COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"),
        COMPAT(INTEL_MICROCODE, "intel,microcode"),
        COMPAT(INTEL_QRK_MRC, "intel,quark-mrc"),
        COMPAT(ALTERA_SOCFPGA_DWMAC, "altr,socfpga-stmmac"),
        COMPAT(ALTERA_SOCFPGA_DWMMC, "altr,socfpga-dw-mshc"),
        COMPAT(ALTERA_SOCFPGA_DWC2USB, "snps,dwc2"),
        COMPAT(INTEL_BAYTRAIL_FSP, "intel,baytrail-fsp"),
        COMPAT(INTEL_BAYTRAIL_FSP_MDP, "intel,baytrail-fsp-mdp"),
        COMPAT(INTEL_IVYBRIDGE_FSP, "intel,ivybridge-fsp"),
        COMPAT(COMPAT_SUNXI_NAND, "allwinner,sun4i-a10-nand"),
        COMPAT(ALTERA_SOCFPGA_CLK, "altr,clk-mgr"),
        COMPAT(ALTERA_SOCFPGA_PINCTRL_SINGLE, "pinctrl-single"),
        COMPAT(ALTERA_SOCFPGA_H2F_BRG, "altr,socfpga-hps2fpga-bridge"),
        COMPAT(ALTERA_SOCFPGA_LWH2F_BRG, "altr,socfpga-lwhps2fpga-bridge"),
        COMPAT(ALTERA_SOCFPGA_F2H_BRG, "altr,socfpga-fpga2hps-bridge"),
        COMPAT(ALTERA_SOCFPGA_F2SDR0, "altr,socfpga-fpga2sdram0-bridge"),
        COMPAT(ALTERA_SOCFPGA_F2SDR1, "altr,socfpga-fpga2sdram1-bridge"),
        COMPAT(ALTERA_SOCFPGA_F2SDR2, "altr,socfpga-fpga2sdram2-bridge"),
        COMPAT(ALTERA_SOCFPGA_FPGA0, "altr,socfpga-a10-fpga-mgr"),
        COMPAT(ALTERA_SOCFPGA_NOC, "altr,socfpga-a10-noc"),
        COMPAT(ALTERA_SOCFPGA_CLK_INIT, "altr,socfpga-a10-clk-init")
};

static const char *const fdt_src_name[] = {
        [FDTSRC_SEPARATE] = "separate",
        [FDTSRC_FIT] = "fit",
        [FDTSRC_BOARD] = "board",
        [FDTSRC_EMBED] = "embed",
        [FDTSRC_ENV] = "env",
};

const char *fdtdec_get_srcname(void)
{
        return fdt_src_name[gd->fdt_src];
}

const char *fdtdec_get_compatible(enum fdt_compat_id id)
{
        /* We allow reading of the 'unknown' ID for testing purposes */
        assert(id >= 0 && id < COMPAT_COUNT);
        return compat_names[id];
}

fdt_addr_t fdtdec_get_addr_size_fixed(const void *blob, int node,
                                      const char *prop_name, int index, int na,
                                      int ns, fdt_size_t *sizep,
                                      bool translate)
{
        const fdt32_t *prop, *prop_end;
        const fdt32_t *prop_addr, *prop_size, *prop_after_size;
        int len;
        fdt_addr_t addr;

        debug("%s: %s: ", __func__, prop_name);

        prop = fdt_getprop(blob, node, prop_name, &len);
        if (!prop) {
                debug("(not found)\n");
                return FDT_ADDR_T_NONE;
        }
        prop_end = prop + (len / sizeof(*prop));

        prop_addr = prop + (index * (na + ns));
        prop_size = prop_addr + na;
        prop_after_size = prop_size + ns;
        if (prop_after_size > prop_end) {
                debug("(not enough data: expected >= %d cells, got %d cells)\n",
                      (u32)(prop_after_size - prop), ((u32)(prop_end - prop)));
                return FDT_ADDR_T_NONE;
        }

#if CONFIG_IS_ENABLED(OF_TRANSLATE)
        if (translate)
                addr = fdt_translate_address(blob, node, prop_addr);
        else
#endif
                addr = fdtdec_get_number(prop_addr, na);

        if (sizep) {
                *sizep = fdtdec_get_number(prop_size, ns);
                debug("addr=%08llx, size=%llx\n", (unsigned long long)addr,
                      (unsigned long long)*sizep);
        } else {
                debug("addr=%08llx\n", (unsigned long long)addr);
        }

        return addr;
}

fdt_addr_t fdtdec_get_addr_size_auto_parent(const void *blob, int parent,
                                            int node, const char *prop_name,
                                            int index, fdt_size_t *sizep,
                                            bool translate)
{
        int na, ns;

        debug("%s: ", __func__);

        na = fdt_address_cells(blob, parent);
        if (na < 1) {
                debug("(bad #address-cells)\n");
                return FDT_ADDR_T_NONE;
        }

        ns = fdt_size_cells(blob, parent);
        if (ns < 0) {
                debug("(bad #size-cells)\n");
                return FDT_ADDR_T_NONE;
        }

        debug("na=%d, ns=%d, ", na, ns);

        return fdtdec_get_addr_size_fixed(blob, node, prop_name, index, na,
                                          ns, sizep, translate);
}

fdt_addr_t fdtdec_get_addr_size_auto_noparent(const void *blob, int node,
                                              const char *prop_name, int index,
                                              fdt_size_t *sizep,
                                              bool translate)
{
        int parent;

        debug("%s: ", __func__);

        parent = fdt_parent_offset(blob, node);
        if (parent < 0) {
                debug("(no parent found)\n");
                return FDT_ADDR_T_NONE;
        }

        return fdtdec_get_addr_size_auto_parent(blob, parent, node, prop_name,
                                                index, sizep, translate);
}

fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
                                const char *prop_name, fdt_size_t *sizep)
{
        int ns = sizep ? (sizeof(fdt_size_t) / sizeof(fdt32_t)) : 0;

        return fdtdec_get_addr_size_fixed(blob, node, prop_name, 0,
                                          sizeof(fdt_addr_t) / sizeof(fdt32_t),
                                          ns, sizep, false);
}

fdt_addr_t fdtdec_get_addr(const void *blob, int node, const char *prop_name)
{
        return fdtdec_get_addr_size(blob, node, prop_name, NULL);
}

int fdtdec_get_pci_vendev(const void *blob, int node, u16 *vendor, u16 *device)
{
        const char *list, *end;
        int len;

        list = fdt_getprop(blob, node, "compatible", &len);
        if (!list)
                return -ENOENT;

        end = list + len;
        while (list < end) {
                len = strlen(list);
                if (len >= strlen("pciVVVV,DDDD")) {
                        char *s = strstr(list, "pci");

                        /*
                         * check if the string is something like pciVVVV,DDDD.RR
                         * or just pciVVVV,DDDD
                         */
                        if (s && s[7] == ',' &&
                            (s[12] == '.' || s[12] == 0)) {
                                s += 3;
                                *vendor = simple_strtol(s, NULL, 16);

                                s += 5;
                                *device = simple_strtol(s, NULL, 16);

                                return 0;
                        }
                }
                list += (len + 1);
        }

        return -ENOENT;
}

int fdtdec_get_pci_bar32(const struct udevice *dev, struct fdt_pci_addr *addr,
                         u32 *bar)
{
        int barnum;

        /* extract the bar number from fdt_pci_addr */
        barnum = addr->phys_hi & 0xff;
        if (barnum < PCI_BASE_ADDRESS_0 || barnum > PCI_CARDBUS_CIS)
                return -EINVAL;

        barnum = (barnum - PCI_BASE_ADDRESS_0) / 4;

        /*
         * There is a strange toolchain bug with nds32 which complains about
         * an undefined reference here, even if fdtdec_get_pci_bar32() is never
         * called. An #ifdef seems to be the only fix!
         */
#if !IS_ENABLED(CONFIG_NDS32)
        *bar = dm_pci_read_bar32(dev, barnum);
#endif

        return 0;
}

int fdtdec_get_pci_bus_range(const void *blob, int node,
                             struct fdt_resource *res)
{
        const u32 *values;
        int len;

        values = fdt_getprop(blob, node, "bus-range", &len);
        if (!values || len < sizeof(*values) * 2)
                return -EINVAL;

        res->start = fdt32_to_cpu(*values++);
        res->end = fdt32_to_cpu(*values);

        return 0;
}

uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
                           uint64_t default_val)
{
        const unaligned_fdt64_t *cell64;
        int length;

        cell64 = fdt_getprop(blob, node, prop_name, &length);
        if (!cell64 || length < sizeof(*cell64))
                return default_val;

        return fdt64_to_cpu(*cell64);
}

int fdtdec_get_is_enabled(const void *blob, int node)
{
        const char *cell;

        /*
         * It should say "okay", so only allow that. Some fdts use "ok" but
         * this is a bug. Please fix your device tree source file. See here
         * for discussion:
         *
         * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
         */
        cell = fdt_getprop(blob, node, "status", NULL);
        if (cell)
                return strcmp(cell, "okay") == 0;
        return 1;
}

enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
{
        enum fdt_compat_id id;

        /* Search our drivers */
        for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
                if (fdt_node_check_compatible(blob, node,
                                              compat_names[id]) == 0)
                        return id;
        return COMPAT_UNKNOWN;
}

int fdtdec_next_compatible(const void *blob, int node, enum fdt_compat_id id)
{
        return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
}

int fdtdec_next_compatible_subnode(const void *blob, int node,
                                   enum fdt_compat_id id, int *depthp)
{
        do {
                node = fdt_next_node(blob, node, depthp);
        } while (*depthp > 1);

        /* If this is a direct subnode, and compatible, return it */
        if (*depthp == 1 && 0 == fdt_node_check_compatible(
                                                blob, node, compat_names[id]))
                return node;

        return -FDT_ERR_NOTFOUND;
}

int fdtdec_next_alias(const void *blob, const char *name, enum fdt_compat_id id,
                      int *upto)
{
#define MAX_STR_LEN 20
        char str[MAX_STR_LEN + 20];
        int node, err;

        /* snprintf() is not available */
        assert(strlen(name) < MAX_STR_LEN);
        sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
        node = fdt_path_offset(blob, str);
        if (node < 0)
                return node;
        err = fdt_node_check_compatible(blob, node, compat_names[id]);
        if (err < 0)
                return err;
        if (err)
                return -FDT_ERR_NOTFOUND;
        (*upto)++;
        return node;
}

int fdtdec_find_aliases_for_id(const void *blob, const char *name,
                               enum fdt_compat_id id, int *node_list,
                               int maxcount)
{
        memset(node_list, '\0', sizeof(*node_list) * maxcount);

        return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
}

/* TODO: Can we tighten this code up a little? */
int fdtdec_add_aliases_for_id(const void *blob, const char *name,
                              enum fdt_compat_id id, int *node_list,
                              int maxcount)
{
        int name_len = strlen(name);
        int nodes[maxcount];
        int num_found = 0;
        int offset, node;
        int alias_node;
        int count;
        int i, j;

        /* find the alias node if present */
        alias_node = fdt_path_offset(blob, "/aliases");

        /*
         * start with nothing, and we can assume that the root node can't
         * match
         */
        memset(nodes, '\0', sizeof(nodes));

        /* First find all the compatible nodes */
        for (node = count = 0; node >= 0 && count < maxcount;) {
                node = fdtdec_next_compatible(blob, node, id);
                if (node >= 0)
                        nodes[count++] = node;
        }
        if (node >= 0)
                debug("%s: warning: maxcount exceeded with alias '%s'\n",
                      __func__, name);

        /* Now find all the aliases */
        for (offset = fdt_first_property_offset(blob, alias_node);
                        offset > 0;
                        offset = fdt_next_property_offset(blob, offset)) {
                const struct fdt_property *prop;
                const char *path;
                int number;
                int found;

                node = 0;
                prop = fdt_get_property_by_offset(blob, offset, NULL);
                path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
                if (prop->len && 0 == strncmp(path, name, name_len))
                        node = fdt_path_offset(blob, prop->data);
                if (node <= 0)
                        continue;

                /* Get the alias number */
                number = dectoul(path + name_len, NULL);
                if (number < 0 || number >= maxcount) {
                        debug("%s: warning: alias '%s' is out of range\n",
                              __func__, path);
                        continue;
                }

                /* Make sure the node we found is actually in our list! */
                found = -1;
                for (j = 0; j < count; j++)
                        if (nodes[j] == node) {
                                found = j;
                                break;
                        }

                if (found == -1) {
                        debug("%s: warning: alias '%s' points to a node "
                                "'%s' that is missing or is not compatible "
                                " with '%s'\n", __func__, path,
                                fdt_get_name(blob, node, NULL),
                               compat_names[id]);
                        continue;
                }

                /*
                 * Add this node to our list in the right place, and mark
                 * it as done.
                 */
                if (fdtdec_get_is_enabled(blob, node)) {
                        if (node_list[number]) {
                                debug("%s: warning: alias '%s' requires that "
                                      "a node be placed in the list in a "
                                      "position which is already filled by "
                                      "node '%s'\n", __func__, path,
                                      fdt_get_name(blob, node, NULL));
                                continue;
                        }
                        node_list[number] = node;
                        if (number >= num_found)
                                num_found = number + 1;
                }
                nodes[found] = 0;
        }

        /* Add any nodes not mentioned by an alias */
        for (i = j = 0; i < maxcount; i++) {
                if (!node_list[i]) {
                        for (; j < maxcount; j++)
                                if (nodes[j] &&
                                    fdtdec_get_is_enabled(blob, nodes[j]))
                                        break;

                        /* Have we run out of nodes to add? */
                        if (j == maxcount)
                                break;

                        assert(!node_list[i]);
                        node_list[i] = nodes[j++];
                        if (i >= num_found)
                                num_found = i + 1;
                }
        }

        return num_found;
}

int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
                         int *seqp)
{
        int base_len = strlen(base);
        const char *find_name;
        int find_namelen;
        int prop_offset;
        int aliases;

        find_name = fdt_get_name(blob, offset, &find_namelen);
        debug("Looking for '%s' at %d, name %s\n", base, offset, find_name);

        aliases = fdt_path_offset(blob, "/aliases");
        for (prop_offset = fdt_first_property_offset(blob, aliases);
             prop_offset > 0;
             prop_offset = fdt_next_property_offset(blob, prop_offset)) {
                const char *prop;
                const char *name;
                const char *slash;
                int len, val;

                prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len);
                debug("   - %s, %s\n", name, prop);
                if (len < find_namelen || *prop != '/' || prop[len - 1] ||
                    strncmp(name, base, base_len))
                        continue;

                slash = strrchr(prop, '/');
                if (strcmp(slash + 1, find_name))
                        continue;

                /*
                 * Adding an extra check to distinguish DT nodes with
                 * same name
                 */
                if (IS_ENABLED(CONFIG_PHANDLE_CHECK_SEQ)) {
                        if (fdt_get_phandle(blob, offset) !=
                            fdt_get_phandle(blob, fdt_path_offset(blob, prop)))
                                continue;
                }

                val = trailing_strtol(name);
                if (val != -1) {
                        *seqp = val;
                        debug("Found seq %d\n", *seqp);
                        return 0;
                }
        }

        debug("Not found\n");
        return -ENOENT;
}

int fdtdec_get_alias_highest_id(const void *blob, const char *base)
{
        int base_len = strlen(base);
        int prop_offset;
        int aliases;
        int max = -1;

        debug("Looking for highest alias id for '%s'\n", base);

        aliases = fdt_path_offset(blob, "/aliases");
        for (prop_offset = fdt_first_property_offset(blob, aliases);
             prop_offset > 0;
             prop_offset = fdt_next_property_offset(blob, prop_offset)) {
                const char *prop;
                const char *name;
                int len, val;

                prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len);
                debug("   - %s, %s\n", name, prop);
                if (*prop != '/' || prop[len - 1] ||
                    strncmp(name, base, base_len))
                        continue;

                val = trailing_strtol(name);
                if (val > max) {
                        debug("Found seq %d\n", val);
                        max = val;
                }
        }

        return max;
}

const char *fdtdec_get_chosen_prop(const void *blob, const char *name)
{
        int chosen_node;

        if (!blob)
                return NULL;
        chosen_node = fdt_path_offset(blob, "/chosen");
        return fdt_getprop(blob, chosen_node, name, NULL);
}

int fdtdec_get_chosen_node(const void *blob, const char *name)
{
        const char *prop;

        prop = fdtdec_get_chosen_prop(blob, name);
        if (!prop)
                return -FDT_ERR_NOTFOUND;
        return fdt_path_offset(blob, prop);
}

int fdtdec_check_fdt(void)
{
        /*
         * We must have an FDT, but we cannot panic() yet since the console
         * is not ready. So for now, just assert(). Boards which need an early
         * FDT (prior to console ready) will need to make their own
         * arrangements and do their own checks.
         */
        assert(!fdtdec_prepare_fdt());
        return 0;
}

/*
 * This function is a little odd in that it accesses global data. At some
 * point if the architecture board.c files merge this will make more sense.
 * Even now, it is common code.
 */
int fdtdec_prepare_fdt(void)
{
        if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
            fdt_check_header(gd->fdt_blob)) {
#ifdef CONFIG_SPL_BUILD
                puts("Missing DTB\n");
#else
                printf("No valid device tree binary found at %p\n",
                       gd->fdt_blob);
# ifdef DEBUG
                if (gd->fdt_blob) {
                        printf("fdt_blob=%p\n", gd->fdt_blob);
                        print_buffer((ulong)gd->fdt_blob, gd->fdt_blob, 4,
                                     32, 0);
                }
# endif
#endif
                return -1;
        }
        return 0;
}

int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
{
        const u32 *phandle;
        int lookup;

        debug("%s: %s\n", __func__, prop_name);
        phandle = fdt_getprop(blob, node, prop_name, NULL);
        if (!phandle)
                return -FDT_ERR_NOTFOUND;

        lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
        return lookup;
}

/**
 * Look up a property in a node and check that it has a minimum length.
 *
 * @param blob          FDT blob
 * @param node          node to examine
 * @param prop_name     name of property to find
 * @param min_len       minimum property length in bytes
 * @param err           0 if ok, or -FDT_ERR_NOTFOUND if the property is not
                        found, or -FDT_ERR_BADLAYOUT if not enough data
 * Return: pointer to cell, which is only valid if err == 0
 */
static const void *get_prop_check_min_len(const void *blob, int node,
                                          const char *prop_name, int min_len,
                                          int *err)
{
        const void *cell;
        int len;

        debug("%s: %s\n", __func__, prop_name);
        cell = fdt_getprop(blob, node, prop_name, &len);
        if (!cell)
                *err = -FDT_ERR_NOTFOUND;
        else if (len < min_len)
                *err = -FDT_ERR_BADLAYOUT;
        else
                *err = 0;
        return cell;
}

int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
                         u32 *array, int count)
{
        const u32 *cell;
        int err = 0;

        debug("%s: %s\n", __func__, prop_name);
        cell = get_prop_check_min_len(blob, node, prop_name,
                                      sizeof(u32) * count, &err);
        if (!err) {
                int i;

                for (i = 0; i < count; i++)
                        array[i] = fdt32_to_cpu(cell[i]);
        }
        return err;
}

int fdtdec_get_int_array_count(const void *blob, int node,
                               const char *prop_name, u32 *array, int count)
{
        const u32 *cell;
        int len, elems;
        int i;

        debug("%s: %s\n", __func__, prop_name);
        cell = fdt_getprop(blob, node, prop_name, &len);
        if (!cell)
                return -FDT_ERR_NOTFOUND;
        elems = len / sizeof(u32);
        if (count > elems)
                count = elems;
        for (i = 0; i < count; i++)
                array[i] = fdt32_to_cpu(cell[i]);

        return count;
}

const u32 *fdtdec_locate_array(const void *blob, int node,
                               const char *prop_name, int count)
{
        const u32 *cell;
        int err;

        cell = get_prop_check_min_len(blob, node, prop_name,
                                      sizeof(u32) * count, &err);
        return err ? NULL : cell;
}

int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
{
        const s32 *cell;
        int len;

        debug("%s: %s\n", __func__, prop_name);
        cell = fdt_getprop(blob, node, prop_name, &len);
        return cell != NULL;
}

int fdtdec_parse_phandle_with_args(const void *blob, int src_node,
                                   const char *list_name,
                                   const char *cells_name,
                                   int cell_count, int index,
                                   struct fdtdec_phandle_args *out_args)
{
        const __be32 *list, *list_end;
        int rc = 0, size, cur_index = 0;
        uint32_t count = 0;
        int node = -1;
        int phandle;

        /* Retrieve the phandle list property */
        list = fdt_getprop(blob, src_node, list_name, &size);
        if (!list)
                return -ENOENT;
        list_end = list + size / sizeof(*list);

        /* Loop over the phandles until all the requested entry is found */
        while (list < list_end) {
                rc = -EINVAL;
                count = 0;

                /*
                 * If phandle is 0, then it is an empty entry with no
                 * arguments.  Skip forward to the next entry.
                 */
                phandle = be32_to_cpup(list++);
                if (phandle) {
                        /*
                         * Find the provider node and parse the #*-cells
                         * property to determine the argument length.
                         *
                         * This is not needed if the cell count is hard-coded
                         * (i.e. cells_name not set, but cell_count is set),
                         * except when we're going to return the found node
                         * below.
                         */
                        if (cells_name || cur_index == index) {
                                node = fdt_node_offset_by_phandle(blob,
                                                                  phandle);
                                if (node < 0) {
                                        debug("%s: could not find phandle\n",
                                              fdt_get_name(blob, src_node,
                                                           NULL));
                                        goto err;
                                }
                        }

                        if (cells_name) {
                                count = fdtdec_get_int(blob, node, cells_name,
                                                       -1);
                                if (count == -1) {
                                        debug("%s: could not get %s for %s\n",
                                              fdt_get_name(blob, src_node,
                                                           NULL),
                                              cells_name,
                                              fdt_get_name(blob, node,
                                                           NULL));
                                        goto err;
                                }
                        } else {
                                count = cell_count;
                        }

                        /*
                         * Make sure that the arguments actually fit in the
                         * remaining property data length
                         */
                        if (list + count > list_end) {
                                debug("%s: arguments longer than property\n",
                                      fdt_get_name(blob, src_node, NULL));
                                goto err;
                        }
                }

                /*
                 * All of the error cases above bail out of the loop, so at
                 * this point, the parsing is successful. If the requested
                 * index matches, then fill the out_args structure and return,
                 * or return -ENOENT for an empty entry.
                 */
                rc = -ENOENT;
                if (cur_index == index) {
                        if (!phandle)
                                goto err;

                        if (out_args) {
                                int i;

                                if (count > MAX_PHANDLE_ARGS) {
                                        debug("%s: too many arguments %d\n",
                                              fdt_get_name(blob, src_node,
                                                           NULL), count);
                                        count = MAX_PHANDLE_ARGS;
                                }
                                out_args->node = node;
                                out_args->args_count = count;
                                for (i = 0; i < count; i++) {
                                        out_args->args[i] =
                                                        be32_to_cpup(list++);
                                }
                        }

                        /* Found it! return success */
                        return 0;
                }

                node = -1;
                list += count;
                cur_index++;
        }

        /*
         * Result will be one of:
         * -ENOENT : index is for empty phandle
         * -EINVAL : parsing error on data
         * [1..n]  : Number of phandle (count mode; when index = -1)
         */
        rc = index < 0 ? cur_index : -ENOENT;
 err:
        return rc;
}

int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
                          u8 *array, int count)
{
        const u8 *cell;
        int err;

        cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
        if (!err)
                memcpy(array, cell, count);
        return err;
}

const u8 *fdtdec_locate_byte_array(const void *blob, int node,
                                   const char *prop_name, int count)
{
        const u8 *cell;
        int err;

        cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
        if (err)
                return NULL;
        return cell;
}

u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells)
{
        u64 number = 0;

        while (cells--)
                number = (number << 32) | fdt32_to_cpu(*ptr++);

        return number;
}

int fdt_get_resource(const void *fdt, int node, const char *property,
                     unsigned int index, struct fdt_resource *res)
{
        const fdt32_t *ptr, *end;
        int na, ns, len, parent;
        unsigned int i = 0;

        parent = fdt_parent_offset(fdt, node);
        if (parent < 0)
                return parent;

        na = fdt_address_cells(fdt, parent);
        ns = fdt_size_cells(fdt, parent);

        ptr = fdt_getprop(fdt, node, property, &len);
        if (!ptr)
                return len;

        end = ptr + len / sizeof(*ptr);

        while (ptr + na + ns <= end) {
                if (i == index) {
                        if (CONFIG_IS_ENABLED(OF_TRANSLATE))
                                res->start = fdt_translate_address(fdt, node, ptr);
                        else
                                res->start = fdtdec_get_number(ptr, na);

                        res->end = res->start;
                        res->end += fdtdec_get_number(&ptr[na], ns) - 1;
                        return 0;
                }

                ptr += na + ns;
                i++;
        }

        return -FDT_ERR_NOTFOUND;
}

int fdt_get_named_resource(const void *fdt, int node, const char *property,
                           const char *prop_names, const char *name,
                           struct fdt_resource *res)
{
        int index;

        index = fdt_stringlist_search(fdt, node, prop_names, name);
        if (index < 0)
                return index;

        return fdt_get_resource(fdt, node, property, index, res);
}

static int decode_timing_property(const void *blob, int node, const char *name,
                                  struct timing_entry *result)
{
        int length, ret = 0;
        const u32 *prop;

        prop = fdt_getprop(blob, node, name, &length);
        if (!prop) {
                debug("%s: could not find property %s\n",
                      fdt_get_name(blob, node, NULL), name);
                return length;
        }

        if (length == sizeof(u32)) {
                result->typ = fdtdec_get_int(blob, node, name, 0);
                result->min = result->typ;
                result->max = result->typ;
        } else {
                ret = fdtdec_get_int_array(blob, node, name, &result->min, 3);
        }

        return ret;
}

int fdtdec_decode_display_timing(const void *blob, int parent, int index,
                                 struct display_timing *dt)
{
        int i, node, timings_node;
        u32 val = 0;
        int ret = 0;

        timings_node = fdt_subnode_offset(blob, parent, "display-timings");
        if (timings_node < 0)
                return timings_node;

        for (i = 0, node = fdt_first_subnode(blob, timings_node);
             node > 0 && i != index;
             node = fdt_next_subnode(blob, node))
                i++;

        if (node < 0)
                return node;

        memset(dt, 0, sizeof(*dt));

        ret |= decode_timing_property(blob, node, "hback-porch",
                                      &dt->hback_porch);
        ret |= decode_timing_property(blob, node, "hfront-porch",
                                      &dt->hfront_porch);
        ret |= decode_timing_property(blob, node, "hactive", &dt->hactive);
        ret |= decode_timing_property(blob, node, "hsync-len", &dt->hsync_len);
        ret |= decode_timing_property(blob, node, "vback-porch",
                                      &dt->vback_porch);
        ret |= decode_timing_property(blob, node, "vfront-porch",
                                      &dt->vfront_porch);
        ret |= decode_timing_property(blob, node, "vactive", &dt->vactive);
        ret |= decode_timing_property(blob, node, "vsync-len", &dt->vsync_len);
        ret |= decode_timing_property(blob, node, "clock-frequency",
                                      &dt->pixelclock);

        dt->flags = 0;
        val = fdtdec_get_int(blob, node, "vsync-active", -1);
        if (val != -1) {
                dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH :
                                DISPLAY_FLAGS_VSYNC_LOW;
        }
        val = fdtdec_get_int(blob, node, "hsync-active", -1);
        if (val != -1) {
                dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH :
                                DISPLAY_FLAGS_HSYNC_LOW;
        }
        val = fdtdec_get_int(blob, node, "de-active", -1);
        if (val != -1) {
                dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH :
                                DISPLAY_FLAGS_DE_LOW;
        }
        val = fdtdec_get_int(blob, node, "pixelclk-active", -1);
        if (val != -1) {
                dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE :
                                DISPLAY_FLAGS_PIXDATA_NEGEDGE;
        }

        if (fdtdec_get_bool(blob, node, "interlaced"))
                dt->flags |= DISPLAY_FLAGS_INTERLACED;
        if (fdtdec_get_bool(blob, node, "doublescan"))
                dt->flags |= DISPLAY_FLAGS_DOUBLESCAN;
        if (fdtdec_get_bool(blob, node, "doubleclk"))
                dt->flags |= DISPLAY_FLAGS_DOUBLECLK;

        return ret;
}

int fdtdec_setup_mem_size_base(void)
{
        int ret;
        ofnode mem;
        struct resource res;

        mem = ofnode_path("/memory");
        if (!ofnode_valid(mem)) {
                debug("%s: Missing /memory node\n", __func__);
                return -EINVAL;
        }

        ret = ofnode_read_resource(mem, 0, &res);
        if (ret != 0) {
                debug("%s: Unable to decode first memory bank\n", __func__);
                return -EINVAL;
        }

        gd->ram_size = (phys_size_t)(res.end - res.start + 1);
        gd->ram_base = (unsigned long)res.start;
        debug("%s: Initial DRAM size %llx\n", __func__,
              (unsigned long long)gd->ram_size);

        return 0;
}

ofnode get_next_memory_node(ofnode mem)
{
        do {
                mem = ofnode_by_prop_value(mem, "device_type", "memory", 7);
        } while (!ofnode_is_available(mem));

        return mem;
}

int fdtdec_setup_memory_banksize(void)
{
        int bank, ret, reg = 0;
        struct resource res;
        ofnode mem = ofnode_null();

        mem = get_next_memory_node(mem);
        if (!ofnode_valid(mem)) {
                debug("%s: Missing /memory node\n", __func__);
                return -EINVAL;
        }

        for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
                ret = ofnode_read_resource(mem, reg++, &res);
                if (ret < 0) {
                        reg = 0;
                        mem = get_next_memory_node(mem);
                        if (!ofnode_valid(mem))
                                break;

                        ret = ofnode_read_resource(mem, reg++, &res);
                        if (ret < 0)
                                break;
                }

                if (ret != 0)
                        return -EINVAL;

                gd->bd->bi_dram[bank].start = (phys_addr_t)res.start;
                gd->bd->bi_dram[bank].size =
                        (phys_size_t)(res.end - res.start + 1);

                debug("%s: DRAM Bank #%d: start = 0x%llx, size = 0x%llx\n",
                      __func__, bank,
                      (unsigned long long)gd->bd->bi_dram[bank].start,
                      (unsigned long long)gd->bd->bi_dram[bank].size);
        }

        return 0;
}

int fdtdec_setup_mem_size_base_lowest(void)
{
        int bank, ret, reg = 0;
        struct resource res;
        unsigned long base;
        phys_size_t size;
        ofnode mem = ofnode_null();

        gd->ram_base = (unsigned long)~0;

        mem = get_next_memory_node(mem);
        if (!ofnode_valid(mem)) {
                debug("%s: Missing /memory node\n", __func__);
                return -EINVAL;
        }

        for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
                ret = ofnode_read_resource(mem, reg++, &res);
                if (ret < 0) {
                        reg = 0;
                        mem = get_next_memory_node(mem);
                        if (!ofnode_valid(mem))
                                break;

                        ret = ofnode_read_resource(mem, reg++, &res);
                        if (ret < 0)
                                break;
                }

                if (ret != 0)
                        return -EINVAL;

                base = (unsigned long)res.start;
                size = (phys_size_t)(res.end - res.start + 1);

                if (gd->ram_base > base && size) {
                        gd->ram_base = base;
                        gd->ram_size = size;
                        debug("%s: Initial DRAM base %lx size %lx\n",
                              __func__, base, (unsigned long)size);
                }
        }

        return 0;
}

static int uncompress_blob(const void *src, ulong sz_src, void **dstp)
{
#if CONFIG_IS_ENABLED(MULTI_DTB_FIT_GZIP) ||\
        CONFIG_IS_ENABLED(MULTI_DTB_FIT_LZO)
        size_t sz_out = CONFIG_VAL(MULTI_DTB_FIT_UNCOMPRESS_SZ);
        bool gzip = 0, lzo = 0;
        ulong sz_in = sz_src;
        void *dst;
        int rc;

        if (CONFIG_IS_ENABLED(GZIP))
                if (gzip_parse_header(src, sz_in) >= 0)
                        gzip = 1;
        if (CONFIG_IS_ENABLED(LZO))
                if (!gzip && lzop_is_valid_header(src))
                        lzo = 1;

        if (!gzip && !lzo)
                return -EBADMSG;


        if (CONFIG_IS_ENABLED(MULTI_DTB_FIT_DYN_ALLOC)) {
                dst = malloc(sz_out);
                if (!dst) {
                        puts("uncompress_blob: Unable to allocate memory\n");
                        return -ENOMEM;
                }
        } else  {
# if CONFIG_IS_ENABLED(MULTI_DTB_FIT_USER_DEFINED_AREA)
                dst = (void *)CONFIG_VAL(MULTI_DTB_FIT_USER_DEF_ADDR);
# else
                return -ENOTSUPP;
# endif
        }

        if (CONFIG_IS_ENABLED(GZIP) && gzip)
                rc = gunzip(dst, sz_out, (u8 *)src, &sz_in);
        else if (CONFIG_IS_ENABLED(LZO) && lzo)
                rc = lzop_decompress(src, sz_in, dst, &sz_out);
        else
                hang();

        if (rc < 0) {
                /* not a valid compressed blob */
                puts("uncompress_blob: Unable to uncompress\n");
                if (CONFIG_IS_ENABLED(MULTI_DTB_FIT_DYN_ALLOC))
                        free(dst);
                return -EBADMSG;
        }
        *dstp = dst;
#else
        *dstp = (void *)src;
        *dstp = (void *)src;
#endif
        return 0;
}

/**
 * fdt_find_separate() - Find a devicetree at the end of the image
 *
 * Return: pointer to FDT blob
 */
static void *fdt_find_separate(void)
{
        void *fdt_blob = NULL;

#ifdef CONFIG_SPL_BUILD
        /* FDT is at end of BSS unless it is in a different memory region */
        if (IS_ENABLED(CONFIG_SPL_SEPARATE_BSS))
                fdt_blob = (ulong *)&_image_binary_end;
        else
                fdt_blob = (ulong *)&__bss_end;
#else
        /* FDT is at end of image */
        fdt_blob = (ulong *)&_end;
#endif

        return fdt_blob;
}

int fdtdec_set_ethernet_mac_address(void *fdt, const u8 *mac, size_t size)
{
        const char *path;
        int offset, err;

        if (!is_valid_ethaddr(mac))
                return -EINVAL;

        path = fdt_get_alias(fdt, "ethernet");
        if (!path)
                return 0;

        debug("ethernet alias found: %s\n", path);

        offset = fdt_path_offset(fdt, path);
        if (offset < 0) {
                debug("ethernet alias points to absent node %s\n", path);
                return -ENOENT;
        }

        err = fdt_setprop_inplace(fdt, offset, "local-mac-address", mac, size);
        if (err < 0)
                return err;

        debug("MAC address: %pM\n", mac);

        return 0;
}

static int fdtdec_init_reserved_memory(void *blob)
{
        int na, ns, node, err;
        fdt32_t value;

        /* inherit #address-cells and #size-cells from the root node */
        na = fdt_address_cells(blob, 0);
        ns = fdt_size_cells(blob, 0);

        node = fdt_add_subnode(blob, 0, "reserved-memory");
        if (node < 0)
                return node;

        err = fdt_setprop(blob, node, "ranges", NULL, 0);
        if (err < 0)
                return err;

        value = cpu_to_fdt32(ns);

        err = fdt_setprop(blob, node, "#size-cells", &value, sizeof(value));
        if (err < 0)
                return err;

        value = cpu_to_fdt32(na);

        err = fdt_setprop(blob, node, "#address-cells", &value, sizeof(value));
        if (err < 0)
                return err;

        return node;
}

int fdtdec_add_reserved_memory(void *blob, const char *basename,
                               const struct fdt_memory *carveout,
                               const char **compatibles, unsigned int count,
                               uint32_t *phandlep, unsigned long flags)
{
        fdt32_t cells[4] = {}, *ptr = cells;
        uint32_t upper, lower, phandle;
        int parent, node, na, ns, err;
        fdt_size_t size;
        char name[64];

        /* create an empty /reserved-memory node if one doesn't exist */
        parent = fdt_path_offset(blob, "/reserved-memory");
        if (parent < 0) {
                parent = fdtdec_init_reserved_memory(blob);
                if (parent < 0)
                        return parent;
        }

        /* only 1 or 2 #address-cells and #size-cells are supported */
        na = fdt_address_cells(blob, parent);
        if (na < 1 || na > 2)
                return -FDT_ERR_BADNCELLS;

        ns = fdt_size_cells(blob, parent);
        if (ns < 1 || ns > 2)
                return -FDT_ERR_BADNCELLS;

        /* find a matching node and return the phandle to that */
        fdt_for_each_subnode(node, blob, parent) {
                const char *name = fdt_get_name(blob, node, NULL);
                fdt_addr_t addr;
                fdt_size_t size;

                addr = fdtdec_get_addr_size_fixed(blob, node, "reg", 0, na, ns,
                                                  &size, false);
                if (addr == FDT_ADDR_T_NONE) {
                        debug("failed to read address/size for %s\n", name);
                        continue;
                }

                if (addr == carveout->start && (addr + size - 1) ==
                                                carveout->end) {
                        if (phandlep)
                                *phandlep = fdt_get_phandle(blob, node);
                        return 0;
                }
        }

        /*
         * Unpack the start address and generate the name of the new node
         * base on the basename and the unit-address.
         */
        upper = upper_32_bits(carveout->start);
        lower = lower_32_bits(carveout->start);

        if (na > 1 && upper > 0)
                snprintf(name, sizeof(name), "%s@%x,%x", basename, upper,
                         lower);
        else {
                if (upper > 0) {
                        debug("address %08x:%08x exceeds addressable space\n",
                              upper, lower);
                        return -FDT_ERR_BADVALUE;
                }

                snprintf(name, sizeof(name), "%s@%x", basename, lower);
        }

        node = fdt_add_subnode(blob, parent, name);
        if (node < 0)
                return node;

        if (flags & FDTDEC_RESERVED_MEMORY_NO_MAP) {
                err = fdt_setprop(blob, node, "no-map", NULL, 0);
                if (err < 0)
                        return err;
        }

        if (phandlep) {
                err = fdt_generate_phandle(blob, &phandle);
                if (err < 0)
                        return err;

                err = fdtdec_set_phandle(blob, node, phandle);
                if (err < 0)
                        return err;
        }

        /* store one or two address cells */
        if (na > 1)
                *ptr++ = cpu_to_fdt32(upper);

        *ptr++ = cpu_to_fdt32(lower);

        /* store one or two size cells */
        size = carveout->end - carveout->start + 1;
        upper = upper_32_bits(size);
        lower = lower_32_bits(size);

        if (ns > 1)
                *ptr++ = cpu_to_fdt32(upper);

        *ptr++ = cpu_to_fdt32(lower);

        err = fdt_setprop(blob, node, "reg", cells, (na + ns) * sizeof(*cells));
        if (err < 0)
                return err;

        if (compatibles && count > 0) {
                size_t length = 0, len = 0;
                unsigned int i;
                char *buffer;

                for (i = 0; i < count; i++)
                        length += strlen(compatibles[i]) + 1;

                buffer = malloc(length);
                if (!buffer)
                        return -FDT_ERR_INTERNAL;

                for (i = 0; i < count; i++)
                        len += strlcpy(buffer + len, compatibles[i],
                                       length - len) + 1;

                err = fdt_setprop(blob, node, "compatible", buffer, length);
                free(buffer);
                if (err < 0)
                        return err;
        }

        /* return the phandle for the new node for the caller to use */
        if (phandlep)
                *phandlep = phandle;

        return 0;
}

int fdtdec_get_carveout(const void *blob, const char *node,
                        const char *prop_name, unsigned int index,
                        struct fdt_memory *carveout, const char **name,
                        const char ***compatiblesp, unsigned int *countp,
                        unsigned long *flags)
{
        const fdt32_t *prop;
        uint32_t phandle;
        int offset, len;
        fdt_size_t size;

        offset = fdt_path_offset(blob, node);
        if (offset < 0)
                return offset;

        prop = fdt_getprop(blob, offset, prop_name, &len);
        if (!prop) {
                debug("failed to get %s for %s\n", prop_name, node);
                return -FDT_ERR_NOTFOUND;
        }

        if ((len % sizeof(phandle)) != 0) {
                debug("invalid phandle property\n");
                return -FDT_ERR_BADPHANDLE;
        }

        if (len < (sizeof(phandle) * (index + 1))) {
                debug("invalid phandle index\n");
                return -FDT_ERR_NOTFOUND;
        }

        phandle = fdt32_to_cpu(prop[index]);

        offset = fdt_node_offset_by_phandle(blob, phandle);
        if (offset < 0) {
                debug("failed to find node for phandle %u\n", phandle);
                return offset;
        }

        if (name)
                *name = fdt_get_name(blob, offset, NULL);

        if (compatiblesp) {
                const char **compatibles = NULL;
                const char *start, *end, *ptr;
                unsigned int count = 0;

                prop = fdt_getprop(blob, offset, "compatible", &len);
                if (!prop)
                        goto skip_compat;

                start = ptr = (const char *)prop;
                end = start + len;

                while (ptr < end) {
                        ptr = strchrnul(ptr, '\0');
                        count++;
                        ptr++;
                }

                compatibles = malloc(sizeof(ptr) * count);
                if (!compatibles)
                        return -FDT_ERR_INTERNAL;

                ptr = start;
                count = 0;

                while (ptr < end) {
                        compatibles[count] = ptr;
                        ptr = strchrnul(ptr, '\0');
                        count++;
                        ptr++;
                }

skip_compat:
                *compatiblesp = compatibles;

                if (countp)
                        *countp = count;
        }

        carveout->start = fdtdec_get_addr_size_auto_noparent(blob, offset,
                                                             "reg", 0, &size,
                                                             true);
        if (carveout->start == FDT_ADDR_T_NONE) {
                debug("failed to read address/size from \"reg\" property\n");
                return -FDT_ERR_NOTFOUND;
        }

        carveout->end = carveout->start + size - 1;

        if (flags) {
                *flags = 0;

                if (fdtdec_get_bool(blob, offset, "no-map"))
                        *flags |= FDTDEC_RESERVED_MEMORY_NO_MAP;
        }

        return 0;
}

int fdtdec_set_carveout(void *blob, const char *node, const char *prop_name,
                        unsigned int index, const struct fdt_memory *carveout,
                        const char *name, const char **compatibles,
                        unsigned int count, unsigned long flags)
{
        uint32_t phandle;
        int err, offset, len;
        fdt32_t value;
        void *prop;

        err = fdtdec_add_reserved_memory(blob, name, carveout, compatibles,
                                         count, &phandle, flags);
        if (err < 0) {
                debug("failed to add reserved memory: %d\n", err);
                return err;
        }

        offset = fdt_path_offset(blob, node);
        if (offset < 0) {
                debug("failed to find offset for node %s: %d\n", node, offset);
                return offset;
        }

        value = cpu_to_fdt32(phandle);

        if (!fdt_getprop(blob, offset, prop_name, &len)) {
                if (len == -FDT_ERR_NOTFOUND)
                        len = 0;
                else
                        return len;
        }

        if ((index + 1) * sizeof(value) > len) {
                err = fdt_setprop_placeholder(blob, offset, prop_name,
                                              (index + 1) * sizeof(value),
                                              &prop);
                if (err < 0) {
                        debug("failed to resize reserved memory property: %s\n",
                              fdt_strerror(err));
                        return err;
                }
        }

        err = fdt_setprop_inplace_namelen_partial(blob, offset, prop_name,
                                                  strlen(prop_name),
                                                  index * sizeof(value),
                                                  &value, sizeof(value));
        if (err < 0) {
                debug("failed to update %s property for node %s: %s\n",
                      prop_name, node, fdt_strerror(err));
                return err;
        }

        return 0;
}

/* TODO(sjg@chromium.org): This function should not be weak */
__weak int fdtdec_board_setup(const void *fdt_blob)
{
        return 0;
}

/**
 * setup_multi_dtb_fit() - locate the correct dtb from a FIT
 *
 * This supports the CONFIG_MULTI_DTB_FIT feature, looking for the dtb in a
 * supplied FIT
 *
 * It accepts the current value of gd->fdt_blob, which points to the FIT, then
 * updates that gd->fdt_blob, to point to the chosen dtb so that U-Boot uses the
 * correct one
 */
static void setup_multi_dtb_fit(void)
{
        void *blob;

        /*
         * Try and uncompress the blob.
         * Unfortunately there is no way to know how big the input blob really
         * is. So let us set the maximum input size arbitrarily high. 16MB
         * ought to be more than enough for packed DTBs.
         */
        if (uncompress_blob(gd->fdt_blob, 0x1000000, &blob) == 0)
                gd->fdt_blob = blob;

        /*
         * Check if blob is a FIT images containings DTBs.
         * If so, pick the most relevant
         */
        blob = locate_dtb_in_fit(gd->fdt_blob);
        if (blob) {
                gd_set_multi_dtb_fit(gd->fdt_blob);
                gd->fdt_blob = blob;
                gd->fdt_src = FDTSRC_FIT;
        }
}

int fdtdec_setup(void)
{
        int ret;

        /* The devicetree is typically appended to U-Boot */
        if (IS_ENABLED(CONFIG_OF_SEPARATE)) {
                gd->fdt_blob = fdt_find_separate();
                gd->fdt_src = FDTSRC_SEPARATE;
        } else { /* embed dtb in ELF file for testing / development */
                gd->fdt_blob = dtb_dt_embedded();
                gd->fdt_src = FDTSRC_EMBED;
        }

        /* Allow the board to override the fdt address. */
        if (IS_ENABLED(CONFIG_OF_BOARD)) {
                gd->fdt_blob = board_fdt_blob_setup(&ret);
                if (ret)
                        return ret;
                gd->fdt_src = FDTSRC_BOARD;
        }

        /* Allow the early environment to override the fdt address */
        if (!IS_ENABLED(CONFIG_SPL_BUILD)) {
                ulong addr;

                addr = env_get_hex("fdtcontroladdr", 0);
                if (addr) {
                        gd->fdt_blob = map_sysmem(addr, 0);
                        gd->fdt_src = FDTSRC_ENV;
                }
        }

        if (CONFIG_IS_ENABLED(MULTI_DTB_FIT))
                setup_multi_dtb_fit();

        ret = fdtdec_prepare_fdt();
        if (!ret)
                ret = fdtdec_board_setup(gd->fdt_blob);
        return ret;
}

int fdtdec_resetup(int *rescan)
{
        void *fdt_blob;

        /*
         * If the current DTB is part of a compressed FIT image,
         * try to locate the best match from the uncompressed
         * FIT image stillpresent there. Save the time and space
         * required to uncompress it again.
         */
        if (gd_multi_dtb_fit()) {
                fdt_blob = locate_dtb_in_fit(gd_multi_dtb_fit());

                if (fdt_blob == gd->fdt_blob) {
                        /*
                         * The best match did not change. no need to tear down
                         * the DM and rescan the fdt.
                         */
                        *rescan = 0;
                        return 0;
                }

                *rescan = 1;
                gd->fdt_blob = fdt_blob;
                return fdtdec_prepare_fdt();
        }

        /*
         * If multi_dtb_fit is NULL, it means that blob appended to u-boot is
         * not a FIT image containings DTB, but a single DTB. There is no need
         * to teard down DM and rescan the DT in this case.
         */
        *rescan = 0;
        return 0;
}

int fdtdec_decode_ram_size(const void *blob, const char *area, int board_id,
                           phys_addr_t *basep, phys_size_t *sizep,
                           struct bd_info *bd)
{
        int addr_cells, size_cells;
        const u32 *cell, *end;
        u64 total_size, size, addr;
        int node, child;
        bool auto_size;
        int bank;
        int len;

        debug("%s: board_id=%d\n", __func__, board_id);
        if (!area)
                area = "/memory";
        node = fdt_path_offset(blob, area);
        if (node < 0) {
                debug("No %s node found\n", area);
                return -ENOENT;
        }

        cell = fdt_getprop(blob, node, "reg", &len);
        if (!cell) {
                debug("No reg property found\n");
                return -ENOENT;
        }

        addr_cells = fdt_address_cells(blob, node);
        size_cells = fdt_size_cells(blob, node);

        /* Check the board id and mask */
        for (child = fdt_first_subnode(blob, node);
             child >= 0;
             child = fdt_next_subnode(blob, child)) {
                int match_mask, match_value;

                match_mask = fdtdec_get_int(blob, child, "match-mask", -1);
                match_value = fdtdec_get_int(blob, child, "match-value", -1);

                if (match_value >= 0 &&
                    ((board_id & match_mask) == match_value)) {
                        /* Found matching mask */
                        debug("Found matching mask %d\n", match_mask);
                        node = child;
                        cell = fdt_getprop(blob, node, "reg", &len);
                        if (!cell) {
                                debug("No memory-banks property found\n");
                                return -EINVAL;
                        }
                        break;
                }
        }
        /* Note: if no matching subnode was found we use the parent node */

        if (bd) {
                memset(bd->bi_dram, '\0', sizeof(bd->bi_dram[0]) *
                                                CONFIG_NR_DRAM_BANKS);
        }

        auto_size = fdtdec_get_bool(blob, node, "auto-size");

        total_size = 0;
        end = cell + len / 4 - addr_cells - size_cells;
        debug("cell at %p, end %p\n", cell, end);
        for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
                if (cell > end)
                        break;
                addr = 0;
                if (addr_cells == 2)
                        addr += (u64)fdt32_to_cpu(*cell++) << 32UL;
                addr += fdt32_to_cpu(*cell++);
                if (bd)
                        bd->bi_dram[bank].start = addr;
                if (basep && !bank)
                        *basep = (phys_addr_t)addr;

                size = 0;
                if (size_cells == 2)
                        size += (u64)fdt32_to_cpu(*cell++) << 32UL;
                size += fdt32_to_cpu(*cell++);

                if (auto_size) {
                        u64 new_size;

                        debug("Auto-sizing %llx, size %llx: ", addr, size);
                        new_size = get_ram_size((long *)(uintptr_t)addr, size);
                        if (new_size == size) {
                                debug("OK\n");
                        } else {
                                debug("sized to %llx\n", new_size);
                                size = new_size;
                        }
                }

                if (bd)
                        bd->bi_dram[bank].size = size;
                total_size += size;
        }

        debug("Memory size %llu\n", total_size);
        if (sizep)
                *sizep = (phys_size_t)total_size;

        return 0;
}

#endif /* !USE_HOSTCC */