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 #define CONFIG_ARCH_CPU_INIT
  18
  19 /* Use SoC timer for AArch32, but architected timer for AArch64 */
  20 #ifndef CONFIG_ARM64
  21 #define CONFIG_SYS_TIMER_RATE           1000000
  22 #define CONFIG_SYS_TIMER_COUNTER        \
  23         (&((struct bcm2835_timer_regs *)BCM2835_TIMER_PHYSADDR)->clo)
  24 #endif
  25
  26 /*
  27  * 2835 is a SKU in a series for which the 2708 is the first or primary SoC,
  28  * so 2708 has historically been used rather than a dedicated 2835 ID.
  29  *
  30  * We don't define a machine type for bcm2709/bcm2836 since the RPi Foundation
  31  * chose to use someone else's previously registered machine ID (3139, MX51_GGC)
  32  * rather than obtaining a valid ID:-/
  33  *
  34  * For the bcm2837, hopefully a machine type is not needed, since everything
  35  * is DT.
  36  */
  37 #ifdef CONFIG_BCM2835
  38 #define CONFIG_MACH_TYPE                MACH_TYPE_BCM2708
  39 #endif
  40
  41 /* Memory layout */
  42 #define CONFIG_SYS_SDRAM_BASE           0x00000000
  43 #define CONFIG_SYS_UBOOT_BASE           CONFIG_SYS_TEXT_BASE
  44 /*
  45  * The board really has 256M. However, the VC (VideoCore co-processor) shares
  46  * the RAM, and uses a configurable portion at the top. We tell U-Boot that a
  47  * smaller amount of RAM is present in order to avoid stomping on the area
  48  * the VC uses.
  49  */
  50 #define CONFIG_SYS_SDRAM_SIZE           SZ_128M
  51 #define CONFIG_SYS_INIT_SP_ADDR         (CONFIG_SYS_SDRAM_BASE + \
  52                                          CONFIG_SYS_SDRAM_SIZE - \
  53                                          GENERATED_GBL_DATA_SIZE)
  54 #define CONFIG_SYS_MALLOC_LEN           SZ_4M
  55 #define CONFIG_SYS_MEMTEST_START        0x00100000
  56 #define CONFIG_SYS_MEMTEST_END          0x00200000
  57 #define CONFIG_LOADADDR                 0x00200000
  58
  59 /* Devices */
  60 /* GPIO */
  61 #define CONFIG_BCM2835_GPIO
  62 /* LCD */
  63 #define CONFIG_LCD_DT_SIMPLEFB
  64 #define CONFIG_VIDEO_BCM2835
  65
  66 #ifdef CONFIG_CMD_USB
  67 #define CONFIG_TFTP_TSIZE
  68 #endif
  69
  70 /* Console configuration */
  71 #define CONFIG_SYS_CBSIZE               1024
  72
  73 /* Environment */
  74 #define CONFIG_ENV_SIZE                 SZ_16K
  75 #define CONFIG_SYS_LOAD_ADDR            0x1000000
  76 #define CONFIG_USE_PREBOOT
  77 #define CONFIG_PREBOOT                  "usb start"
  78
  79 /* Shell */
  80
  81 /* ATAGs support for bootm/bootz */
  82 #define CONFIG_SETUP_MEMORY_TAGS
  83 #define CONFIG_CMDLINE_TAG
  84 #define CONFIG_INITRD_TAG
  85
  86 /* Environment */
  87 #define ENV_DEVICE_SETTINGS \
  88         "stdin=serial,usbkbd\0" \
  89         "stdout=serial,vidconsole\0" \
  90         "stderr=serial,vidconsole\0"
  91
  92 #ifdef CONFIG_ARM64
  93 #define FDT_HIGH "ffffffffffffffff"
  94 #define INITRD_HIGH "ffffffffffffffff"
  95 #else
  96 #define FDT_HIGH "ffffffff"
  97 #define INITRD_HIGH "ffffffff"
  98 #endif
  99
 100 /*
 101  * Memory layout for where various images get loaded by boot scripts:
 102  *
 103  * I suspect address 0 is used as the SMP pen on the RPi2, so avoid this.
 104  *
 105  * Older versions of the boot firmware place the firmware-loaded DTB at 0x100,
 106  * newer versions place it in high memory. So prevent U-Boot from doing its own
 107  * DTB + initrd relocation so that we won't accidentally relocate the initrd
 108  * over the firmware-loaded DTB and generally try to lay out things starting
 109  * from the bottom of RAM.
 110  *
 111  * kernel_addr_r has different constraints on ARM and Aarch64.  For 32-bit ARM,
 112  * it must be within the first 128M of RAM in order for the kernel's
 113  * CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed
 114  * to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The
 115  * decompressor also likes to relocate itself to right past the end of the
 116  * decompressed kernel, so in total the sum of the compressed and and
 117  * decompressed kernel needs to be reserved.
 118  *
 119  *   For Aarch64, the kernel image is uncompressed and must be loaded at
 120  *   text_offset bytes (specified in the header of the Image) into a 2MB
 121  *   boundary. The 'booti' command relocates the image if necessary. Linux uses
 122  *   a default text_offset of 0x80000.  In summary, loading at 0x80000
 123  *   satisfies all these constraints and reserving memory up to 0x02400000
 124  *   permits fairly large (roughly 36M) kernels.
 125  *
 126  * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
 127  * conflict with something else. Reserving 1M for each of them at
 128  * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
 129  *
 130  * On ARM, both the DTB and any possible initrd must be loaded such that they
 131  * fit inside the lowmem mapping in Linux. In practice, this usually means not
 132  * more than ~700M away from the start of the kernel image but this number can
 133  * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
 134  * parameter given to the kernel. So reserving memory from low to high
 135  * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
 136  * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
 137  * Even with the smallest possible CPU-GPU memory split of the CPU getting
 138  * only 64M, the remaining 25M starting at 0x02700000 should allow quite
 139  * large initrds before they start colliding with U-Boot.
 140  */
 141 #define ENV_MEM_LAYOUT_SETTINGS \
 142         "fdt_high=" FDT_HIGH "\0" \
 143         "initrd_high=" INITRD_HIGH "\0" \
 144         "kernel_addr_r=0x00080000\0" \
 145         "scriptaddr=0x02400000\0" \
 146         "pxefile_addr_r=0x02500000\0" \
 147         "fdt_addr_r=0x02600000\0" \
 148         "ramdisk_addr_r=0x02700000\0"
 149
 150 #if CONFIG_IS_ENABLED(CMD_MMC)
 151         #define BOOT_TARGET_MMC(func) \
 152                 func(MMC, mmc, 0) \
 153                 func(MMC, mmc, 1)
 154 #else
 155         #define BOOT_TARGET_MMC(func)
 156 #endif
 157
 158 #if CONFIG_IS_ENABLED(CMD_USB)
 159         #define BOOT_TARGET_USB(func) func(USB, usb, 0)
 160 #else
 161         #define BOOT_TARGET_USB(func)
 162 #endif
 163
 164 #if CONFIG_IS_ENABLED(CMD_PXE)
 165         #define BOOT_TARGET_PXE(func) func(PXE, pxe, na)
 166 #else
 167         #define BOOT_TARGET_PXE(func)
 168 #endif
 169
 170 #if CONFIG_IS_ENABLED(CMD_DHCP)
 171         #define BOOT_TARGET_DHCP(func) func(DHCP, dhcp, na)
 172 #else
 173         #define BOOT_TARGET_DHCP(func)
 174 #endif
 175
 176 #define BOOT_TARGET_DEVICES(func) \
 177         BOOT_TARGET_MMC(func) \
 178         BOOT_TARGET_USB(func) \
 179         BOOT_TARGET_PXE(func) \
 180         BOOT_TARGET_DHCP(func)
 181
 182 #include <config_distro_bootcmd.h>
 183
 184 #define CONFIG_EXTRA_ENV_SETTINGS \
 185         "dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \
 186         ENV_DEVICE_SETTINGS \
 187         ENV_MEM_LAYOUT_SETTINGS \
 188         BOOTENV
 189
 190
 191 #endif