include/configs/rpi.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * (C) Copyright 2012-2016 Stephen Warren
   4  */
   5
   6 #ifndef __CONFIG_H
   7 #define __CONFIG_H
   8
   9 #include <linux/sizes.h>
  10 #include <asm/arch/timer.h>
  11
  12 #if defined(CONFIG_TARGET_RPI_2) || defined(CONFIG_TARGET_RPI_3_32B)
  13 #define CONFIG_SKIP_LOWLEVEL_INIT
  14 #endif
  15
  16 /* Architecture, CPU, etc.*/
  17
  18 /* Use SoC timer for AArch32, but architected timer for AArch64 */
  19 #ifndef CONFIG_ARM64
  20 #define CONFIG_SYS_TIMER_RATE           1000000
  21 #define CONFIG_SYS_TIMER_COUNTER        \
  22         (&((struct bcm2835_timer_regs *)BCM2835_TIMER_PHYSADDR)->clo)
  23 #endif
  24
  25 /*
  26  * 2835 is a SKU in a series for which the 2708 is the first or primary SoC,
  27  * so 2708 has historically been used rather than a dedicated 2835 ID.
  28  *
  29  * We don't define a machine type for bcm2709/bcm2836 since the RPi Foundation
  30  * chose to use someone else's previously registered machine ID (3139, MX51_GGC)
  31  * rather than obtaining a valid ID:-/
  32  *
  33  * For the bcm2837, hopefully a machine type is not needed, since everything
  34  * is DT.
  35  */
  36 #ifdef CONFIG_BCM2835
  37 #define CONFIG_MACH_TYPE                MACH_TYPE_BCM2708
  38 #endif
  39
  40 /* Memory layout */
  41 #define CONFIG_SYS_SDRAM_BASE           0x00000000
  42 #define CONFIG_SYS_UBOOT_BASE           CONFIG_SYS_TEXT_BASE
  43 /*
  44  * The board really has 256M. However, the VC (VideoCore co-processor) shares
  45  * the RAM, and uses a configurable portion at the top. We tell U-Boot that a
  46  * smaller amount of RAM is present in order to avoid stomping on the area
  47  * the VC uses.
  48  */
  49 #define CONFIG_SYS_SDRAM_SIZE           SZ_128M
  50 #define CONFIG_SYS_INIT_SP_ADDR         (CONFIG_SYS_SDRAM_BASE + \
  51                                          CONFIG_SYS_SDRAM_SIZE - \
  52                                          GENERATED_GBL_DATA_SIZE)
  53 #define CONFIG_SYS_MALLOC_LEN           SZ_4M
  54 #define CONFIG_SYS_MEMTEST_START        0x00100000
  55 #define CONFIG_SYS_MEMTEST_END          0x00200000
  56 #define CONFIG_LOADADDR                 0x00200000
  57
  58 /* Devices */
  59 /* GPIO */
  60 #define CONFIG_BCM2835_GPIO
  61 /* LCD */
  62 #define CONFIG_LCD_DT_SIMPLEFB
  63 #define CONFIG_VIDEO_BCM2835
  64
  65 #ifdef CONFIG_CMD_USB
  66 #define CONFIG_TFTP_TSIZE
  67 #endif
  68
  69 /* Console configuration */
  70 #define CONFIG_SYS_CBSIZE               1024
  71
  72 /* Environment */
  73 #define CONFIG_ENV_SIZE                 SZ_16K
  74 #define CONFIG_SYS_LOAD_ADDR            0x1000000
  75
  76 /* Shell */
  77
  78 /* ATAGs support for bootm/bootz */
  79 #define CONFIG_SETUP_MEMORY_TAGS
  80 #define CONFIG_CMDLINE_TAG
  81 #define CONFIG_INITRD_TAG
  82
  83 /* Environment */
  84 #define ENV_DEVICE_SETTINGS \
  85         "stdin=serial,usbkbd\0" \
  86         "stdout=serial,vidconsole\0" \
  87         "stderr=serial,vidconsole\0"
  88
  89 #ifdef CONFIG_ARM64
  90 #define FDT_HIGH "ffffffffffffffff"
  91 #define INITRD_HIGH "ffffffffffffffff"
  92 #else
  93 #define FDT_HIGH "ffffffff"
  94 #define INITRD_HIGH "ffffffff"
  95 #endif
  96
  97 /*
  98  * Memory layout for where various images get loaded by boot scripts:
  99  *
 100  * I suspect address 0 is used as the SMP pen on the RPi2, so avoid this.
 101  *
 102  * Older versions of the boot firmware place the firmware-loaded DTB at 0x100,
 103  * newer versions place it in high memory. So prevent U-Boot from doing its own
 104  * DTB + initrd relocation so that we won't accidentally relocate the initrd
 105  * over the firmware-loaded DTB and generally try to lay out things starting
 106  * from the bottom of RAM.
 107  *
 108  * kernel_addr_r has different constraints on ARM and Aarch64.  For 32-bit ARM,
 109  * it must be within the first 128M of RAM in order for the kernel's
 110  * CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed
 111  * to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The
 112  * decompressor also likes to relocate itself to right past the end of the
 113  * decompressed kernel, so in total the sum of the compressed and and
 114  * decompressed kernel needs to be reserved.
 115  *
 116  *   For Aarch64, the kernel image is uncompressed and must be loaded at
 117  *   text_offset bytes (specified in the header of the Image) into a 2MB
 118  *   boundary. The 'booti' command relocates the image if necessary. Linux uses
 119  *   a default text_offset of 0x80000.  In summary, loading at 0x80000
 120  *   satisfies all these constraints and reserving memory up to 0x02400000
 121  *   permits fairly large (roughly 36M) kernels.
 122  *
 123  * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
 124  * conflict with something else. Reserving 1M for each of them at
 125  * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
 126  *
 127  * On ARM, both the DTB and any possible initrd must be loaded such that they
 128  * fit inside the lowmem mapping in Linux. In practice, this usually means not
 129  * more than ~700M away from the start of the kernel image but this number can
 130  * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
 131  * parameter given to the kernel. So reserving memory from low to high
 132  * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
 133  * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
 134  * Even with the smallest possible CPU-GPU memory split of the CPU getting
 135  * only 64M, the remaining 25M starting at 0x02700000 should allow quite
 136  * large initrds before they start colliding with U-Boot.
 137  */
 138 #define ENV_MEM_LAYOUT_SETTINGS \
 139         "fdt_high=" FDT_HIGH "\0" \
 140         "initrd_high=" INITRD_HIGH "\0" \
 141         "kernel_addr_r=0x00080000\0" \
 142         "scriptaddr=0x02400000\0" \
 143         "pxefile_addr_r=0x02500000\0" \
 144         "fdt_addr_r=0x02600000\0" \
 145         "ramdisk_addr_r=0x02700000\0"
 146
 147 #if CONFIG_IS_ENABLED(CMD_MMC)
 148         #define BOOT_TARGET_MMC(func) \
 149                 func(MMC, mmc, 0) \
 150                 func(MMC, mmc, 1)
 151 #else
 152         #define BOOT_TARGET_MMC(func)
 153 #endif
 154
 155 #if CONFIG_IS_ENABLED(CMD_USB)
 156         #define BOOT_TARGET_USB(func) func(USB, usb, 0)
 157 #else
 158         #define BOOT_TARGET_USB(func)
 159 #endif
 160
 161 #if CONFIG_IS_ENABLED(CMD_PXE)
 162         #define BOOT_TARGET_PXE(func) func(PXE, pxe, na)
 163 #else
 164         #define BOOT_TARGET_PXE(func)
 165 #endif
 166
 167 #if CONFIG_IS_ENABLED(CMD_DHCP)
 168         #define BOOT_TARGET_DHCP(func) func(DHCP, dhcp, na)
 169 #else
 170         #define BOOT_TARGET_DHCP(func)
 171 #endif
 172
 173 #define BOOT_TARGET_DEVICES(func) \
 174         BOOT_TARGET_MMC(func) \
 175         BOOT_TARGET_USB(func) \
 176         BOOT_TARGET_PXE(func) \
 177         BOOT_TARGET_DHCP(func)
 178
 179 #include <config_distro_bootcmd.h>
 180
 181 #define CONFIG_EXTRA_ENV_SETTINGS \
 182         "dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \
 183         ENV_DEVICE_SETTINGS \
 184         ENV_MEM_LAYOUT_SETTINGS \
 185         BOOTENV
 186
 187
 188 #endif