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_PREBOOT "usb start" 77 78 /* Shell */ 79 80 /* ATAGs support for bootm/bootz */ 81 #define CONFIG_SETUP_MEMORY_TAGS 82 #define CONFIG_CMDLINE_TAG 83 #define CONFIG_INITRD_TAG 84 85 /* Environment */ 86 #define ENV_DEVICE_SETTINGS \ 87 "stdin=serial,usbkbd\0" \ 88 "stdout=serial,vidconsole\0" \ 89 "stderr=serial,vidconsole\0" 90 91 #ifdef CONFIG_ARM64 92 #define FDT_HIGH "ffffffffffffffff" 93 #define INITRD_HIGH "ffffffffffffffff" 94 #else 95 #define FDT_HIGH "ffffffff" 96 #define INITRD_HIGH "ffffffff" 97 #endif 98 99 /* 100 * Memory layout for where various images get loaded by boot scripts: 101 * 102 * I suspect address 0 is used as the SMP pen on the RPi2, so avoid this. 103 * 104 * Older versions of the boot firmware place the firmware-loaded DTB at 0x100, 105 * newer versions place it in high memory. So prevent U-Boot from doing its own 106 * DTB + initrd relocation so that we won't accidentally relocate the initrd 107 * over the firmware-loaded DTB and generally try to lay out things starting 108 * from the bottom of RAM. 109 * 110 * kernel_addr_r has different constraints on ARM and Aarch64. For 32-bit ARM, 111 * it must be within the first 128M of RAM in order for the kernel's 112 * CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed 113 * to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The 114 * decompressor also likes to relocate itself to right past the end of the 115 * decompressed kernel, so in total the sum of the compressed and and 116 * decompressed kernel needs to be reserved. 117 * 118 * For Aarch64, the kernel image is uncompressed and must be loaded at 119 * text_offset bytes (specified in the header of the Image) into a 2MB 120 * boundary. The 'booti' command relocates the image if necessary. Linux uses 121 * a default text_offset of 0x80000. In summary, loading at 0x80000 122 * satisfies all these constraints and reserving memory up to 0x02400000 123 * permits fairly large (roughly 36M) kernels. 124 * 125 * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't 126 * conflict with something else. Reserving 1M for each of them at 127 * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty. 128 * 129 * On ARM, both the DTB and any possible initrd must be loaded such that they 130 * fit inside the lowmem mapping in Linux. In practice, this usually means not 131 * more than ~700M away from the start of the kernel image but this number can 132 * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line 133 * parameter given to the kernel. So reserving memory from low to high 134 * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for 135 * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000. 136 * Even with the smallest possible CPU-GPU memory split of the CPU getting 137 * only 64M, the remaining 25M starting at 0x02700000 should allow quite 138 * large initrds before they start colliding with U-Boot. 139 */ 140 #define ENV_MEM_LAYOUT_SETTINGS \ 141 "fdt_high=" FDT_HIGH "\0" \ 142 "initrd_high=" INITRD_HIGH "\0" \ 143 "kernel_addr_r=0x00080000\0" \ 144 "scriptaddr=0x02400000\0" \ 145 "pxefile_addr_r=0x02500000\0" \ 146 "fdt_addr_r=0x02600000\0" \ 147 "ramdisk_addr_r=0x02700000\0" 148 149 #define BOOT_TARGET_DEVICES(func) \ 150 func(MMC, mmc, 0) \ 151 func(MMC, mmc, 1) \ 152 func(USB, usb, 0) \ 153 func(PXE, pxe, na) \ 154 func(DHCP, dhcp, na) 155 #include <config_distro_bootcmd.h> 156 157 #define CONFIG_EXTRA_ENV_SETTINGS \ 158 "dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \ 159 ENV_DEVICE_SETTINGS \ 160 ENV_MEM_LAYOUT_SETTINGS \ 161 BOOTENV 162 163 164 #endif 165