yaffs2: cosmetic: remove self assignments

[people/ms/u-boot.git] / common / cmd_mem.c

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

/*
 * Memory Functions
 *
 * Copied from FADS ROM, Dan Malek (dmalek@jlc.net)
 */

#include <common.h>
#include <bootretry.h>
#include <cli.h>
#include <command.h>
#ifdef CONFIG_HAS_DATAFLASH
#include <dataflash.h>
#endif
#include <hash.h>
#include <watchdog.h>
#include <asm/io.h>
#include <linux/compiler.h>

DECLARE_GLOBAL_DATA_PTR;

#ifndef CONFIG_SYS_MEMTEST_SCRATCH
#define CONFIG_SYS_MEMTEST_SCRATCH 0
#endif

static int mod_mem(cmd_tbl_t *, int, int, int, char * const []);

/* Display values from last command.
 * Memory modify remembered values are different from display memory.
 */
static uint     dp_last_addr, dp_last_size;
static uint     dp_last_length = 0x40;
static uint     mm_last_addr, mm_last_size;

static  ulong   base_address = 0;

/* Memory Display
 *
 * Syntax:
 *      md{.b, .w, .l, .q} {addr} {len}
 */
#define DISP_LINE_LEN   16
static int do_mem_md(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        ulong   addr, length;
#if defined(CONFIG_HAS_DATAFLASH)
        ulong   nbytes, linebytes;
#endif
        int     size;
        int rc = 0;

        /* We use the last specified parameters, unless new ones are
         * entered.
         */
        addr = dp_last_addr;
        size = dp_last_size;
        length = dp_last_length;

        if (argc < 2)
                return CMD_RET_USAGE;

        if ((flag & CMD_FLAG_REPEAT) == 0) {
                /* New command specified.  Check for a size specification.
                 * Defaults to long if no or incorrect specification.
                 */
                if ((size = cmd_get_data_size(argv[0], 4)) < 0)
                        return 1;

                /* Address is specified since argc > 1
                */
                addr = simple_strtoul(argv[1], NULL, 16);
                addr += base_address;

                /* If another parameter, it is the length to display.
                 * Length is the number of objects, not number of bytes.
                 */
                if (argc > 2)
                        length = simple_strtoul(argv[2], NULL, 16);
        }

#if defined(CONFIG_HAS_DATAFLASH)
        /* Print the lines.
         *
         * We buffer all read data, so we can make sure data is read only
         * once, and all accesses are with the specified bus width.
         */
        nbytes = length * size;
        do {
                char    linebuf[DISP_LINE_LEN];
                void* p;
                linebytes = (nbytes>DISP_LINE_LEN)?DISP_LINE_LEN:nbytes;

                rc = read_dataflash(addr, (linebytes/size)*size, linebuf);
                p = (rc == DATAFLASH_OK) ? linebuf : (void*)addr;
                print_buffer(addr, p, size, linebytes/size, DISP_LINE_LEN/size);

                nbytes -= linebytes;
                addr += linebytes;
                if (ctrlc()) {
                        rc = 1;
                        break;
                }
        } while (nbytes > 0);
#else

# if defined(CONFIG_BLACKFIN)
        /* See if we're trying to display L1 inst */
        if (addr_bfin_on_chip_mem(addr)) {
                char linebuf[DISP_LINE_LEN];
                ulong linebytes, nbytes = length * size;
                do {
                        linebytes = (nbytes > DISP_LINE_LEN) ? DISP_LINE_LEN : nbytes;
                        memcpy(linebuf, (void *)addr, linebytes);
                        print_buffer(addr, linebuf, size, linebytes/size, DISP_LINE_LEN/size);

                        nbytes -= linebytes;
                        addr += linebytes;
                        if (ctrlc()) {
                                rc = 1;
                                break;
                        }
                } while (nbytes > 0);
        } else
# endif

        {
                ulong bytes = size * length;
                const void *buf = map_sysmem(addr, bytes);

                /* Print the lines. */
                print_buffer(addr, buf, size, length, DISP_LINE_LEN / size);
                addr += bytes;
                unmap_sysmem(buf);
        }
#endif

        dp_last_addr = addr;
        dp_last_length = length;
        dp_last_size = size;
        return (rc);
}

static int do_mem_mm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        return mod_mem (cmdtp, 1, flag, argc, argv);
}
static int do_mem_nm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        return mod_mem (cmdtp, 0, flag, argc, argv);
}

static int do_mem_mw(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        u64 writeval;
#else
        ulong writeval;
#endif
        ulong   addr, count;
        int     size;
        void *buf;
        ulong bytes;

        if ((argc < 3) || (argc > 4))
                return CMD_RET_USAGE;

        /* Check for size specification.
        */
        if ((size = cmd_get_data_size(argv[0], 4)) < 1)
                return 1;

        /* Address is specified since argc > 1
        */
        addr = simple_strtoul(argv[1], NULL, 16);
        addr += base_address;

        /* Get the value to write.
        */
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        writeval = simple_strtoull(argv[2], NULL, 16);
#else
        writeval = simple_strtoul(argv[2], NULL, 16);
#endif

        /* Count ? */
        if (argc == 4) {
                count = simple_strtoul(argv[3], NULL, 16);
        } else {
                count = 1;
        }

        bytes = size * count;
        buf = map_sysmem(addr, bytes);
        while (count-- > 0) {
                if (size == 4)
                        *((u32 *)buf) = (u32)writeval;
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
                else if (size == 8)
                        *((u64 *)buf) = (u64)writeval;
#endif
                else if (size == 2)
                        *((u16 *)buf) = (u16)writeval;
                else
                        *((u8 *)buf) = (u8)writeval;
                buf += size;
        }
        unmap_sysmem(buf);
        return 0;
}

#ifdef CONFIG_MX_CYCLIC
int do_mem_mdc ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        int i;
        ulong count;

        if (argc < 4)
                return CMD_RET_USAGE;

        count = simple_strtoul(argv[3], NULL, 10);

        for (;;) {
                do_mem_md (NULL, 0, 3, argv);

                /* delay for <count> ms... */
                for (i=0; i<count; i++)
                        udelay (1000);

                /* check for ctrl-c to abort... */
                if (ctrlc()) {
                        puts("Abort\n");
                        return 0;
                }
        }

        return 0;
}

int do_mem_mwc ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        int i;
        ulong count;

        if (argc < 4)
                return CMD_RET_USAGE;

        count = simple_strtoul(argv[3], NULL, 10);

        for (;;) {
                do_mem_mw (NULL, 0, 3, argv);

                /* delay for <count> ms... */
                for (i=0; i<count; i++)
                        udelay (1000);

                /* check for ctrl-c to abort... */
                if (ctrlc()) {
                        puts("Abort\n");
                        return 0;
                }
        }

        return 0;
}
#endif /* CONFIG_MX_CYCLIC */

static int do_mem_cmp(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        ulong   addr1, addr2, count, ngood, bytes;
        int     size;
        int     rcode = 0;
        const char *type;
        const void *buf1, *buf2, *base;
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        u64 word1, word2;
#else
        ulong word1, word2;
#endif

        if (argc != 4)
                return CMD_RET_USAGE;

        /* Check for size specification.
        */
        if ((size = cmd_get_data_size(argv[0], 4)) < 0)
                return 1;
        type = size == 8 ? "double word" :
               size == 4 ? "word" :
               size == 2 ? "halfword" : "byte";

        addr1 = simple_strtoul(argv[1], NULL, 16);
        addr1 += base_address;

        addr2 = simple_strtoul(argv[2], NULL, 16);
        addr2 += base_address;

        count = simple_strtoul(argv[3], NULL, 16);

#ifdef CONFIG_HAS_DATAFLASH
        if (addr_dataflash(addr1) | addr_dataflash(addr2)){
                puts ("Comparison with DataFlash space not supported.\n\r");
                return 0;
        }
#endif

#ifdef CONFIG_BLACKFIN
        if (addr_bfin_on_chip_mem(addr1) || addr_bfin_on_chip_mem(addr2)) {
                puts ("Comparison with L1 instruction memory not supported.\n\r");
                return 0;
        }
#endif

        bytes = size * count;
        base = buf1 = map_sysmem(addr1, bytes);
        buf2 = map_sysmem(addr2, bytes);
        for (ngood = 0; ngood < count; ++ngood) {
                if (size == 4) {
                        word1 = *(u32 *)buf1;
                        word2 = *(u32 *)buf2;
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
                } else if (size == 8) {
                        word1 = *(u64 *)buf1;
                        word2 = *(u64 *)buf2;
#endif
                } else if (size == 2) {
                        word1 = *(u16 *)buf1;
                        word2 = *(u16 *)buf2;
                } else {
                        word1 = *(u8 *)buf1;
                        word2 = *(u8 *)buf2;
                }
                if (word1 != word2) {
                        ulong offset = buf1 - base;
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
                        printf("%s at 0x%p (%#0*llx) != %s at 0x%p (%#0*llx)\n",
                               type, (void *)(addr1 + offset), size, word1,
                               type, (void *)(addr2 + offset), size, word2);
#else
                        printf("%s at 0x%08lx (%#0*lx) != %s at 0x%08lx (%#0*lx)\n",
                                type, (ulong)(addr1 + offset), size, word1,
                                type, (ulong)(addr2 + offset), size, word2);
#endif
                        rcode = 1;
                        break;
                }

                buf1 += size;
                buf2 += size;

                /* reset watchdog from time to time */
                if ((ngood % (64 << 10)) == 0)
                        WATCHDOG_RESET();
        }
        unmap_sysmem(buf1);
        unmap_sysmem(buf2);

        printf("Total of %ld %s(s) were the same\n", ngood, type);
        return rcode;
}

static int do_mem_cp(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        ulong   addr, dest, count, bytes;
        int     size;
        const void *src;
        void *buf;

        if (argc != 4)
                return CMD_RET_USAGE;

        /* Check for size specification.
        */
        if ((size = cmd_get_data_size(argv[0], 4)) < 0)
                return 1;

        addr = simple_strtoul(argv[1], NULL, 16);
        addr += base_address;

        dest = simple_strtoul(argv[2], NULL, 16);
        dest += base_address;

        count = simple_strtoul(argv[3], NULL, 16);

        if (count == 0) {
                puts ("Zero length ???\n");
                return 1;
        }

#ifndef CONFIG_SYS_NO_FLASH
        /* check if we are copying to Flash */
        if ( (addr2info(dest) != NULL)
#ifdef CONFIG_HAS_DATAFLASH
           && (!addr_dataflash(dest))
#endif
           ) {
                int rc;

                puts ("Copy to Flash... ");

                rc = flash_write ((char *)addr, dest, count*size);
                if (rc != 0) {
                        flash_perror (rc);
                        return (1);
                }
                puts ("done\n");
                return 0;
        }
#endif

#ifdef CONFIG_HAS_DATAFLASH
        /* Check if we are copying from RAM or Flash to DataFlash */
        if (addr_dataflash(dest) && !addr_dataflash(addr)){
                int rc;

                puts ("Copy to DataFlash... ");

                rc = write_dataflash (dest, addr, count*size);

                if (rc != 1) {
                        dataflash_perror (rc);
                        return (1);
                }
                puts ("done\n");
                return 0;
        }

        /* Check if we are copying from DataFlash to RAM */
        if (addr_dataflash(addr) && !addr_dataflash(dest)
#ifndef CONFIG_SYS_NO_FLASH
                                 && (addr2info(dest) == NULL)
#endif
           ){
                int rc;
                rc = read_dataflash(addr, count * size, (char *) dest);
                if (rc != 1) {
                        dataflash_perror (rc);
                        return (1);
                }
                return 0;
        }

        if (addr_dataflash(addr) && addr_dataflash(dest)){
                puts ("Unsupported combination of source/destination.\n\r");
                return 1;
        }
#endif

#ifdef CONFIG_BLACKFIN
        /* See if we're copying to/from L1 inst */
        if (addr_bfin_on_chip_mem(dest) || addr_bfin_on_chip_mem(addr)) {
                memcpy((void *)dest, (void *)addr, count * size);
                return 0;
        }
#endif

        bytes = size * count;
        buf = map_sysmem(dest, bytes);
        src = map_sysmem(addr, bytes);
        while (count-- > 0) {
                if (size == 4)
                        *((u32 *)buf) = *((u32  *)src);
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
                else if (size == 8)
                        *((u64 *)buf) = *((u64 *)src);
#endif
                else if (size == 2)
                        *((u16 *)buf) = *((u16 *)src);
                else
                        *((u8 *)buf) = *((u8 *)src);
                src += size;
                buf += size;

                /* reset watchdog from time to time */
                if ((count % (64 << 10)) == 0)
                        WATCHDOG_RESET();
        }
        return 0;
}

static int do_mem_base(cmd_tbl_t *cmdtp, int flag, int argc,
                       char * const argv[])
{
        if (argc > 1) {
                /* Set new base address.
                */
                base_address = simple_strtoul(argv[1], NULL, 16);
        }
        /* Print the current base address.
        */
        printf("Base Address: 0x%08lx\n", base_address);
        return 0;
}

static int do_mem_loop(cmd_tbl_t *cmdtp, int flag, int argc,
                       char * const argv[])
{
        ulong   addr, length, i, bytes;
        int     size;
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        volatile u64 *llp;
#endif
        volatile u32 *longp;
        volatile u16 *shortp;
        volatile u8 *cp;
        const void *buf;

        if (argc < 3)
                return CMD_RET_USAGE;

        /*
         * Check for a size specification.
         * Defaults to long if no or incorrect specification.
         */
        if ((size = cmd_get_data_size(argv[0], 4)) < 0)
                return 1;

        /* Address is always specified.
        */
        addr = simple_strtoul(argv[1], NULL, 16);

        /* Length is the number of objects, not number of bytes.
        */
        length = simple_strtoul(argv[2], NULL, 16);

        bytes = size * length;
        buf = map_sysmem(addr, bytes);

        /* We want to optimize the loops to run as fast as possible.
         * If we have only one object, just run infinite loops.
         */
        if (length == 1) {
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
                if (size == 8) {
                        llp = (u64 *)buf;
                        for (;;)
                                i = *llp;
                }
#endif
                if (size == 4) {
                        longp = (u32 *)buf;
                        for (;;)
                                i = *longp;
                }
                if (size == 2) {
                        shortp = (u16 *)buf;
                        for (;;)
                                i = *shortp;
                }
                cp = (u8 *)buf;
                for (;;)
                        i = *cp;
        }

#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        if (size == 8) {
                for (;;) {
                        llp = (u64 *)buf;
                        i = length;
                        while (i-- > 0)
                                *llp++;
                }
        }
#endif
        if (size == 4) {
                for (;;) {
                        longp = (u32 *)buf;
                        i = length;
                        while (i-- > 0)
                                *longp++;
                }
        }
        if (size == 2) {
                for (;;) {
                        shortp = (u16 *)buf;
                        i = length;
                        while (i-- > 0)
                                *shortp++;
                }
        }
        for (;;) {
                cp = (u8 *)buf;
                i = length;
                while (i-- > 0)
                        *cp++;
        }
        unmap_sysmem(buf);

        return 0;
}

#ifdef CONFIG_LOOPW
int do_mem_loopw (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        ulong   addr, length, i, bytes;
        int     size;
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        volatile u64 *llp;
        u64 data;
#else
        ulong   data;
#endif
        volatile u32 *longp;
        volatile u16 *shortp;
        volatile u8 *cp;
        void *buf;

        if (argc < 4)
                return CMD_RET_USAGE;

        /*
         * Check for a size specification.
         * Defaults to long if no or incorrect specification.
         */
        if ((size = cmd_get_data_size(argv[0], 4)) < 0)
                return 1;

        /* Address is always specified.
        */
        addr = simple_strtoul(argv[1], NULL, 16);

        /* Length is the number of objects, not number of bytes.
        */
        length = simple_strtoul(argv[2], NULL, 16);

        /* data to write */
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        data = simple_strtoull(argv[3], NULL, 16);
#else
        data = simple_strtoul(argv[3], NULL, 16);
#endif

        bytes = size * length;
        buf = map_sysmem(addr, bytes);

        /* We want to optimize the loops to run as fast as possible.
         * If we have only one object, just run infinite loops.
         */
        if (length == 1) {
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
                if (size == 8) {
                        llp = (u64 *)buf;
                        for (;;)
                                *llp = data;
                }
#endif
                if (size == 4) {
                        longp = (u32 *)buf;
                        for (;;)
                                *longp = data;
                }
                if (size == 2) {
                        shortp = (u16 *)buf;
                        for (;;)
                                *shortp = data;
                }
                cp = (u8 *)buf;
                for (;;)
                        *cp = data;
        }

#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        if (size == 8) {
                for (;;) {
                        llp = (u64 *)buf;
                        i = length;
                        while (i-- > 0)
                                *llp++ = data;
                }
        }
#endif
        if (size == 4) {
                for (;;) {
                        longp = (u32 *)buf;
                        i = length;
                        while (i-- > 0)
                                *longp++ = data;
                }
        }
        if (size == 2) {
                for (;;) {
                        shortp = (u16 *)buf;
                        i = length;
                        while (i-- > 0)
                                *shortp++ = data;
                }
        }
        for (;;) {
                cp = (u8 *)buf;
                i = length;
                while (i-- > 0)
                        *cp++ = data;
        }
}
#endif /* CONFIG_LOOPW */

#ifdef CONFIG_CMD_MEMTEST
static ulong mem_test_alt(vu_long *buf, ulong start_addr, ulong end_addr,
                          vu_long *dummy)
{
        vu_long *addr;
        ulong errs = 0;
        ulong val, readback;
        int j;
        vu_long offset;
        vu_long test_offset;
        vu_long pattern;
        vu_long temp;
        vu_long anti_pattern;
        vu_long num_words;
        static const ulong bitpattern[] = {
                0x00000001,     /* single bit */
                0x00000003,     /* two adjacent bits */
                0x00000007,     /* three adjacent bits */
                0x0000000F,     /* four adjacent bits */
                0x00000005,     /* two non-adjacent bits */
                0x00000015,     /* three non-adjacent bits */
                0x00000055,     /* four non-adjacent bits */
                0xaaaaaaaa,     /* alternating 1/0 */
        };

        num_words = (end_addr - start_addr) / sizeof(vu_long);

        /*
         * Data line test: write a pattern to the first
         * location, write the 1's complement to a 'parking'
         * address (changes the state of the data bus so a
         * floating bus doesn't give a false OK), and then
         * read the value back. Note that we read it back
         * into a variable because the next time we read it,
         * it might be right (been there, tough to explain to
         * the quality guys why it prints a failure when the
         * "is" and "should be" are obviously the same in the
         * error message).
         *
         * Rather than exhaustively testing, we test some
         * patterns by shifting '1' bits through a field of
         * '0's and '0' bits through a field of '1's (i.e.
         * pattern and ~pattern).
         */
        addr = buf;
        for (j = 0; j < sizeof(bitpattern) / sizeof(bitpattern[0]); j++) {
                val = bitpattern[j];
                for (; val != 0; val <<= 1) {
                        *addr = val;
                        *dummy  = ~val; /* clear the test data off the bus */
                        readback = *addr;
                        if (readback != val) {
                                printf("FAILURE (data line): "
                                        "expected %08lx, actual %08lx\n",
                                                val, readback);
                                errs++;
                                if (ctrlc())
                                        return -1;
                        }
                        *addr  = ~val;
                        *dummy  = val;
                        readback = *addr;
                        if (readback != ~val) {
                                printf("FAILURE (data line): "
                                        "Is %08lx, should be %08lx\n",
                                                readback, ~val);
                                errs++;
                                if (ctrlc())
                                        return -1;
                        }
                }
        }

        /*
         * Based on code whose Original Author and Copyright
         * information follows: Copyright (c) 1998 by Michael
         * Barr. This software is placed into the public
         * domain and may be used for any purpose. However,
         * this notice must not be changed or removed and no
         * warranty is either expressed or implied by its
         * publication or distribution.
         */

        /*
        * Address line test

         * Description: Test the address bus wiring in a
         *              memory region by performing a walking
         *              1's test on the relevant bits of the
         *              address and checking for aliasing.
         *              This test will find single-bit
         *              address failures such as stuck-high,
         *              stuck-low, and shorted pins. The base
         *              address and size of the region are
         *              selected by the caller.

         * Notes:       For best results, the selected base
         *              address should have enough LSB 0's to
         *              guarantee single address bit changes.
         *              For example, to test a 64-Kbyte
         *              region, select a base address on a
         *              64-Kbyte boundary. Also, select the
         *              region size as a power-of-two if at
         *              all possible.
         *
         * Returns:     0 if the test succeeds, 1 if the test fails.
         */
        pattern = (vu_long) 0xaaaaaaaa;
        anti_pattern = (vu_long) 0x55555555;

        debug("%s:%d: length = 0x%.8lx\n", __func__, __LINE__, num_words);
        /*
         * Write the default pattern at each of the
         * power-of-two offsets.
         */
        for (offset = 1; offset < num_words; offset <<= 1)
                addr[offset] = pattern;

        /*
         * Check for address bits stuck high.
         */
        test_offset = 0;
        addr[test_offset] = anti_pattern;

        for (offset = 1; offset < num_words; offset <<= 1) {
                temp = addr[offset];
                if (temp != pattern) {
                        printf("\nFAILURE: Address bit stuck high @ 0x%.8lx:"
                                " expected 0x%.8lx, actual 0x%.8lx\n",
                                start_addr + offset*sizeof(vu_long),
                                pattern, temp);
                        errs++;
                        if (ctrlc())
                                return -1;
                }
        }
        addr[test_offset] = pattern;
        WATCHDOG_RESET();

        /*
         * Check for addr bits stuck low or shorted.
         */
        for (test_offset = 1; test_offset < num_words; test_offset <<= 1) {
                addr[test_offset] = anti_pattern;

                for (offset = 1; offset < num_words; offset <<= 1) {
                        temp = addr[offset];
                        if ((temp != pattern) && (offset != test_offset)) {
                                printf("\nFAILURE: Address bit stuck low or"
                                        " shorted @ 0x%.8lx: expected 0x%.8lx,"
                                        " actual 0x%.8lx\n",
                                        start_addr + offset*sizeof(vu_long),
                                        pattern, temp);
                                errs++;
                                if (ctrlc())
                                        return -1;
                        }
                }
                addr[test_offset] = pattern;
        }

        /*
         * Description: Test the integrity of a physical
         *              memory device by performing an
         *              increment/decrement test over the
         *              entire region. In the process every
         *              storage bit in the device is tested
         *              as a zero and a one. The base address
         *              and the size of the region are
         *              selected by the caller.
         *
         * Returns:     0 if the test succeeds, 1 if the test fails.
         */
        num_words++;

        /*
         * Fill memory with a known pattern.
         */
        for (pattern = 1, offset = 0; offset < num_words; pattern++, offset++) {
                WATCHDOG_RESET();
                addr[offset] = pattern;
        }

        /*
         * Check each location and invert it for the second pass.
         */
        for (pattern = 1, offset = 0; offset < num_words; pattern++, offset++) {
                WATCHDOG_RESET();
                temp = addr[offset];
                if (temp != pattern) {
                        printf("\nFAILURE (read/write) @ 0x%.8lx:"
                                " expected 0x%.8lx, actual 0x%.8lx)\n",
                                start_addr + offset*sizeof(vu_long),
                                pattern, temp);
                        errs++;
                        if (ctrlc())
                                return -1;
                }

                anti_pattern = ~pattern;
                addr[offset] = anti_pattern;
        }

        /*
         * Check each location for the inverted pattern and zero it.
         */
        for (pattern = 1, offset = 0; offset < num_words; pattern++, offset++) {
                WATCHDOG_RESET();
                anti_pattern = ~pattern;
                temp = addr[offset];
                if (temp != anti_pattern) {
                        printf("\nFAILURE (read/write): @ 0x%.8lx:"
                                " expected 0x%.8lx, actual 0x%.8lx)\n",
                                start_addr + offset*sizeof(vu_long),
                                anti_pattern, temp);
                        errs++;
                        if (ctrlc())
                                return -1;
                }
                addr[offset] = 0;
        }

        return 0;
}

static ulong mem_test_quick(vu_long *buf, ulong start_addr, ulong end_addr,
                            vu_long pattern, int iteration)
{
        vu_long *end;
        vu_long *addr;
        ulong errs = 0;
        ulong incr, length;
        ulong val, readback;

        /* Alternate the pattern */
        incr = 1;
        if (iteration & 1) {
                incr = -incr;
                /*
                 * Flip the pattern each time to make lots of zeros and
                 * then, the next time, lots of ones.  We decrement
                 * the "negative" patterns and increment the "positive"
                 * patterns to preserve this feature.
                 */
                if (pattern & 0x80000000)
                        pattern = -pattern;     /* complement & increment */
                else
                        pattern = ~pattern;
        }
        length = (end_addr - start_addr) / sizeof(ulong);
        end = buf + length;
        printf("\rPattern %08lX  Writing..."
                "%12s"
                "\b\b\b\b\b\b\b\b\b\b",
                pattern, "");

        for (addr = buf, val = pattern; addr < end; addr++) {
                WATCHDOG_RESET();
                *addr = val;
                val += incr;
        }

        puts("Reading...");

        for (addr = buf, val = pattern; addr < end; addr++) {
                WATCHDOG_RESET();
                readback = *addr;
                if (readback != val) {
                        ulong offset = addr - buf;

                        printf("\nMem error @ 0x%08X: "
                                "found %08lX, expected %08lX\n",
                                (uint)(uintptr_t)(start_addr + offset*sizeof(vu_long)),
                                readback, val);
                        errs++;
                        if (ctrlc())
                                return -1;
                }
                val += incr;
        }

        return 0;
}

/*
 * Perform a memory test. A more complete alternative test can be
 * configured using CONFIG_SYS_ALT_MEMTEST. The complete test loops until
 * interrupted by ctrl-c or by a failure of one of the sub-tests.
 */
static int do_mem_mtest(cmd_tbl_t *cmdtp, int flag, int argc,
                        char * const argv[])
{
        ulong start, end;
        vu_long *buf, *dummy;
        int iteration_limit;
        int ret;
        ulong errs = 0; /* number of errors, or -1 if interrupted */
        ulong pattern;
        int iteration;
#if defined(CONFIG_SYS_ALT_MEMTEST)
        const int alt_test = 1;
#else
        const int alt_test = 0;
#endif

        if (argc > 1)
                start = simple_strtoul(argv[1], NULL, 16);
        else
                start = CONFIG_SYS_MEMTEST_START;

        if (argc > 2)
                end = simple_strtoul(argv[2], NULL, 16);
        else
                end = CONFIG_SYS_MEMTEST_END;

        if (argc > 3)
                pattern = (ulong)simple_strtoul(argv[3], NULL, 16);
        else
                pattern = 0;

        if (argc > 4)
                iteration_limit = (ulong)simple_strtoul(argv[4], NULL, 16);
        else
                iteration_limit = 0;

        printf("Testing %08x ... %08x:\n", (uint)start, (uint)end);
        debug("%s:%d: start %#08lx end %#08lx\n", __func__, __LINE__,
              start, end);

        buf = map_sysmem(start, end - start);
        dummy = map_sysmem(CONFIG_SYS_MEMTEST_SCRATCH, sizeof(vu_long));
        for (iteration = 0;
                        !iteration_limit || iteration < iteration_limit;
                        iteration++) {
                if (ctrlc()) {
                        errs = -1UL;
                        break;
                }

                printf("Iteration: %6d\r", iteration + 1);
                debug("\n");
                if (alt_test) {
                        errs = mem_test_alt(buf, start, end, dummy);
                } else {
                        errs = mem_test_quick(buf, start, end, pattern,
                                              iteration);
                }
                if (errs == -1UL)
                        break;
        }

        /*
         * Work-around for eldk-4.2 which gives this warning if we try to
         * case in the unmap_sysmem() call:
         * warning: initialization discards qualifiers from pointer target type
         */
        {
                void *vbuf = (void *)buf;
                void *vdummy = (void *)dummy;

                unmap_sysmem(vbuf);
                unmap_sysmem(vdummy);
        }

        if (errs == -1UL) {
                /* Memory test was aborted - write a newline to finish off */
                putc('\n');
                ret = 1;
        } else {
                printf("Tested %d iteration(s) with %lu errors.\n",
                        iteration, errs);
                ret = errs != 0;
        }

        return ret;     /* not reached */
}
#endif  /* CONFIG_CMD_MEMTEST */

/* Modify memory.
 *
 * Syntax:
 *      mm{.b, .w, .l, .q} {addr}
 *      nm{.b, .w, .l, .q} {addr}
 */
static int
mod_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char * const argv[])
{
        ulong   addr;
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        u64 i;
#else
        ulong i;
#endif
        int     nbytes, size;
        void *ptr = NULL;

        if (argc != 2)
                return CMD_RET_USAGE;

        bootretry_reset_cmd_timeout();  /* got a good command to get here */
        /* We use the last specified parameters, unless new ones are
         * entered.
         */
        addr = mm_last_addr;
        size = mm_last_size;

        if ((flag & CMD_FLAG_REPEAT) == 0) {
                /* New command specified.  Check for a size specification.
                 * Defaults to long if no or incorrect specification.
                 */
                if ((size = cmd_get_data_size(argv[0], 4)) < 0)
                        return 1;

                /* Address is specified since argc > 1
                */
                addr = simple_strtoul(argv[1], NULL, 16);
                addr += base_address;
        }

#ifdef CONFIG_HAS_DATAFLASH
        if (addr_dataflash(addr)){
                puts ("Can't modify DataFlash in place. Use cp instead.\n\r");
                return 0;
        }
#endif

#ifdef CONFIG_BLACKFIN
        if (addr_bfin_on_chip_mem(addr)) {
                puts ("Can't modify L1 instruction in place. Use cp instead.\n\r");
                return 0;
        }
#endif

        /* Print the address, followed by value.  Then accept input for
         * the next value.  A non-converted value exits.
         */
        do {
                ptr = map_sysmem(addr, size);
                printf("%08lx:", addr);
                if (size == 4)
                        printf(" %08x", *((u32 *)ptr));
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
                else if (size == 8)
                        printf(" %016llx", *((u64 *)ptr));
#endif
                else if (size == 2)
                        printf(" %04x", *((u16 *)ptr));
                else
                        printf(" %02x", *((u8 *)ptr));

                nbytes = cli_readline(" ? ");
                if (nbytes == 0 || (nbytes == 1 && console_buffer[0] == '-')) {
                        /* <CR> pressed as only input, don't modify current
                         * location and move to next. "-" pressed will go back.
                         */
                        if (incrflag)
                                addr += nbytes ? -size : size;
                        nbytes = 1;
                        /* good enough to not time out */
                        bootretry_reset_cmd_timeout();
                }
#ifdef CONFIG_BOOT_RETRY_TIME
                else if (nbytes == -2) {
                        break;  /* timed out, exit the command  */
                }
#endif
                else {
                        char *endp;
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
                        i = simple_strtoull(console_buffer, &endp, 16);
#else
                        i = simple_strtoul(console_buffer, &endp, 16);
#endif
                        nbytes = endp - console_buffer;
                        if (nbytes) {
                                /* good enough to not time out
                                 */
                                bootretry_reset_cmd_timeout();
                                if (size == 4)
                                        *((u32 *)ptr) = i;
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
                                else if (size == 8)
                                        *((u64 *)ptr) = i;
#endif
                                else if (size == 2)
                                        *((u16 *)ptr) = i;
                                else
                                        *((u8 *)ptr) = i;
                                if (incrflag)
                                        addr += size;
                        }
                }
        } while (nbytes);
        if (ptr)
                unmap_sysmem(ptr);

        mm_last_addr = addr;
        mm_last_size = size;
        return 0;
}

#ifdef CONFIG_CMD_CRC32

static int do_mem_crc(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        int flags = 0;
        int ac;
        char * const *av;

        if (argc < 3)
                return CMD_RET_USAGE;

        av = argv + 1;
        ac = argc - 1;
#ifdef CONFIG_HASH_VERIFY
        if (strcmp(*av, "-v") == 0) {
                flags |= HASH_FLAG_VERIFY;
                av++;
                ac--;
        }
#endif

        return hash_command("crc32", flags, cmdtp, flag, ac, av);
}

#endif

/**************************************************/
U_BOOT_CMD(
        md,     3,      1,      do_mem_md,
        "memory display",
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        "[.b, .w, .l, .q] address [# of objects]"
#else
        "[.b, .w, .l] address [# of objects]"
#endif
);


U_BOOT_CMD(
        mm,     2,      1,      do_mem_mm,
        "memory modify (auto-incrementing address)",
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        "[.b, .w, .l, .q] address"
#else
        "[.b, .w, .l] address"
#endif
);


U_BOOT_CMD(
        nm,     2,      1,      do_mem_nm,
        "memory modify (constant address)",
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        "[.b, .w, .l, .q] address"
#else
        "[.b, .w, .l] address"
#endif
);

U_BOOT_CMD(
        mw,     4,      1,      do_mem_mw,
        "memory write (fill)",
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        "[.b, .w, .l, .q] address value [count]"
#else
        "[.b, .w, .l] address value [count]"
#endif
);

U_BOOT_CMD(
        cp,     4,      1,      do_mem_cp,
        "memory copy",
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        "[.b, .w, .l, .q] source target count"
#else
        "[.b, .w, .l] source target count"
#endif
);

U_BOOT_CMD(
        cmp,    4,      1,      do_mem_cmp,
        "memory compare",
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        "[.b, .w, .l, .q] addr1 addr2 count"
#else
        "[.b, .w, .l] addr1 addr2 count"
#endif
);

#ifdef CONFIG_CMD_CRC32

#ifndef CONFIG_CRC32_VERIFY

U_BOOT_CMD(
        crc32,  4,      1,      do_mem_crc,
        "checksum calculation",
        "address count [addr]\n    - compute CRC32 checksum [save at addr]"
);

#else   /* CONFIG_CRC32_VERIFY */

U_BOOT_CMD(
        crc32,  5,      1,      do_mem_crc,
        "checksum calculation",
        "address count [addr]\n    - compute CRC32 checksum [save at addr]\n"
        "-v address count crc\n    - verify crc of memory area"
);

#endif  /* CONFIG_CRC32_VERIFY */

#endif

#ifdef CONFIG_CMD_MEMINFO
__weak void board_show_dram(ulong size)
{
        puts("DRAM:  ");
        print_size(size, "\n");
}

static int do_mem_info(cmd_tbl_t *cmdtp, int flag, int argc,
                       char * const argv[])
{
        board_show_dram(gd->ram_size);

        return 0;
}
#endif

U_BOOT_CMD(
        base,   2,      1,      do_mem_base,
        "print or set address offset",
        "\n    - print address offset for memory commands\n"
        "base off\n    - set address offset for memory commands to 'off'"
);

U_BOOT_CMD(
        loop,   3,      1,      do_mem_loop,
        "infinite loop on address range",
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        "[.b, .w, .l, .q] address number_of_objects"
#else
        "[.b, .w, .l] address number_of_objects"
#endif
);

#ifdef CONFIG_LOOPW
U_BOOT_CMD(
        loopw,  4,      1,      do_mem_loopw,
        "infinite write loop on address range",
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        "[.b, .w, .l, .q] address number_of_objects data_to_write"
#else
        "[.b, .w, .l] address number_of_objects data_to_write"
#endif
);
#endif /* CONFIG_LOOPW */

#ifdef CONFIG_CMD_MEMTEST
U_BOOT_CMD(
        mtest,  5,      1,      do_mem_mtest,
        "simple RAM read/write test",
        "[start [end [pattern [iterations]]]]"
);
#endif  /* CONFIG_CMD_MEMTEST */

#ifdef CONFIG_MX_CYCLIC
U_BOOT_CMD(
        mdc,    4,      1,      do_mem_mdc,
        "memory display cyclic",
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        "[.b, .w, .l, .q] address count delay(ms)"
#else
        "[.b, .w, .l] address count delay(ms)"
#endif
);

U_BOOT_CMD(
        mwc,    4,      1,      do_mem_mwc,
        "memory write cyclic",
#ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
        "[.b, .w, .l, .q] address value delay(ms)"
#else
        "[.b, .w, .l] address value delay(ms)"
#endif
);
#endif /* CONFIG_MX_CYCLIC */

#ifdef CONFIG_CMD_MEMINFO
U_BOOT_CMD(
        meminfo,        3,      1,      do_mem_info,
        "display memory information",
        ""
);
#endif