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 #ifndef __ASSEMBLY__
  13 #include <asm/arch/base.h>
  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 /* Memory layout */
  26 #define CONFIG_SYS_SDRAM_BASE           0x00000000
  27 #define CONFIG_SYS_UBOOT_BASE           CONFIG_SYS_TEXT_BASE
  28 /*
  29  * The board really has 256M. However, the VC (VideoCore co-processor) shares
  30  * the RAM, and uses a configurable portion at the top. We tell U-Boot that a
  31  * smaller amount of RAM is present in order to avoid stomping on the area
  32  * the VC uses.
  33  */
  34 #define CONFIG_SYS_SDRAM_SIZE           SZ_128M
  35 #define CONFIG_SYS_INIT_SP_ADDR         (CONFIG_SYS_SDRAM_BASE + \
  36                                          CONFIG_SYS_SDRAM_SIZE - \
  37                                          GENERATED_GBL_DATA_SIZE)
  38
  39 #ifdef CONFIG_ARM64
  40 #define CONFIG_SYS_BOOTM_LEN            SZ_64M
  41 #endif
  42
  43 /* Devices */
  44 /* LCD */
  45
  46 /* DFU over USB/UDC */
  47 #ifdef CONFIG_CMD_DFU
  48 #ifdef CONFIG_ARM64
  49 #define KERNEL_FILENAME         "Image"
  50 #else
  51 #define KERNEL_FILENAME         "zImage"
  52 #endif
  53
  54 #define ENV_DFU_SETTINGS \
  55         "dfu_alt_info=u-boot.bin fat 0 1;uboot.env fat 0 1;" \
  56                       "config.txt fat 0 1;" \
  57                       KERNEL_FILENAME " fat 0 1\0"
  58 #else
  59 #define ENV_DFU_SETTINGS ""
  60 #endif
  61
  62 /* Console configuration */
  63 #define CONFIG_SYS_CBSIZE               1024
  64
  65 /* Environment */
  66
  67 /* Shell */
  68
  69 /* Environment */
  70 #define ENV_DEVICE_SETTINGS \
  71         "stdin=serial,usbkbd\0" \
  72         "stdout=serial,vidconsole\0" \
  73         "stderr=serial,vidconsole\0"
  74
  75 #ifdef CONFIG_ARM64
  76 #define FDT_HIGH "ffffffffffffffff"
  77 #define INITRD_HIGH "ffffffffffffffff"
  78 #else
  79 #define FDT_HIGH "ffffffff"
  80 #define INITRD_HIGH "ffffffff"
  81 #endif
  82
  83 /*
  84  * Memory layout for where various images get loaded by boot scripts:
  85  *
  86  * I suspect address 0 is used as the SMP pen on the RPi2, so avoid this.
  87  *
  88  * Older versions of the boot firmware place the firmware-loaded DTB at 0x100,
  89  * newer versions place it in high memory. So prevent U-Boot from doing its own
  90  * DTB + initrd relocation so that we won't accidentally relocate the initrd
  91  * over the firmware-loaded DTB and generally try to lay out things starting
  92  * from the bottom of RAM.
  93  *
  94  * kernel_addr_r has different constraints on ARM and Aarch64.  For 32-bit ARM,
  95  * it must be within the first 128M of RAM in order for the kernel's
  96  * CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed
  97  * to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The
  98  * decompressor also likes to relocate itself to right past the end of the
  99  * decompressed kernel, so in total the sum of the compressed and and
 100  * decompressed kernel needs to be reserved.
 101  *
 102  *   For Aarch64, the kernel image is uncompressed and must be loaded at
 103  *   text_offset bytes (specified in the header of the Image) into a 2MB
 104  *   boundary. The 'booti' command relocates the image if necessary. Linux uses
 105  *   a default text_offset of 0x80000.  In summary, loading at 0x80000
 106  *   satisfies all these constraints and reserving memory up to 0x02400000
 107  *   permits fairly large (roughly 36M) kernels.
 108  *
 109  * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
 110  * conflict with something else. Reserving 1M for each of them at
 111  * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
 112  *
 113  * On ARM, both the DTB and any possible initrd must be loaded such that they
 114  * fit inside the lowmem mapping in Linux. In practice, this usually means not
 115  * more than ~700M away from the start of the kernel image but this number can
 116  * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
 117  * parameter given to the kernel. So reserving memory from low to high
 118  * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
 119  * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
 120  * Even with the smallest possible CPU-GPU memory split of the CPU getting
 121  * only 64M, the remaining 25M starting at 0x02700000 should allow quite
 122  * large initrds before they start colliding with U-Boot.
 123  */
 124 #define ENV_MEM_LAYOUT_SETTINGS \
 125         "fdt_high=" FDT_HIGH "\0" \
 126         "initrd_high=" INITRD_HIGH "\0" \
 127         "kernel_addr_r=0x00080000\0" \
 128         "scriptaddr=0x02400000\0" \
 129         "pxefile_addr_r=0x02500000\0" \
 130         "fdt_addr_r=0x02600000\0" \
 131         "ramdisk_addr_r=0x02700000\0"
 132
 133 #if CONFIG_IS_ENABLED(CMD_MMC)
 134         #define BOOT_TARGET_MMC(func) \
 135                 func(MMC, mmc, 0) \
 136                 func(MMC, mmc, 1) \
 137                 func(MMC, mmc, 2)
 138 #else
 139         #define BOOT_TARGET_MMC(func)
 140 #endif
 141
 142 #if CONFIG_IS_ENABLED(CMD_USB)
 143         #define BOOT_TARGET_USB(func) func(USB, usb, 0)
 144 #else
 145         #define BOOT_TARGET_USB(func)
 146 #endif
 147
 148 #if CONFIG_IS_ENABLED(CMD_PXE)
 149         #define BOOT_TARGET_PXE(func) func(PXE, pxe, na)
 150 #else
 151         #define BOOT_TARGET_PXE(func)
 152 #endif
 153
 154 #if CONFIG_IS_ENABLED(CMD_DHCP)
 155         #define BOOT_TARGET_DHCP(func) func(DHCP, dhcp, na)
 156 #else
 157         #define BOOT_TARGET_DHCP(func)
 158 #endif
 159
 160 #define BOOT_TARGET_DEVICES(func) \
 161         BOOT_TARGET_MMC(func) \
 162         BOOT_TARGET_USB(func) \
 163         BOOT_TARGET_PXE(func) \
 164         BOOT_TARGET_DHCP(func)
 165
 166 #include <config_distro_bootcmd.h>
 167
 168 #define CONFIG_EXTRA_ENV_SETTINGS \
 169         "dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \
 170         ENV_DEVICE_SETTINGS \
 171         ENV_DFU_SETTINGS \
 172         ENV_MEM_LAYOUT_SETTINGS \
 173         BOOTENV
 174
 175
 176 #endif