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_NR_DRAM_BANKS 1 43 #define CONFIG_SYS_SDRAM_BASE 0x00000000 44 #define CONFIG_SYS_UBOOT_BASE CONFIG_SYS_TEXT_BASE 45 /* 46 * The board really has 256M. However, the VC (VideoCore co-processor) shares 47 * the RAM, and uses a configurable portion at the top. We tell U-Boot that a 48 * smaller amount of RAM is present in order to avoid stomping on the area 49 * the VC uses. 50 */ 51 #define CONFIG_SYS_SDRAM_SIZE SZ_128M 52 #define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + \ 53 CONFIG_SYS_SDRAM_SIZE - \ 54 GENERATED_GBL_DATA_SIZE) 55 #define CONFIG_SYS_MALLOC_LEN SZ_4M 56 #define CONFIG_SYS_MEMTEST_START 0x00100000 57 #define CONFIG_SYS_MEMTEST_END 0x00200000 58 #define CONFIG_LOADADDR 0x00200000 59 60 /* Devices */ 61 /* GPIO */ 62 #define CONFIG_BCM2835_GPIO 63 /* LCD */ 64 #define CONFIG_LCD_DT_SIMPLEFB 65 #define CONFIG_VIDEO_BCM2835 66 67 #ifdef CONFIG_CMD_USB 68 #define CONFIG_TFTP_TSIZE 69 #define CONFIG_MISC_INIT_R 70 #endif 71 72 /* Console configuration */ 73 #define CONFIG_SYS_CBSIZE 1024 74 75 /* Environment */ 76 #define CONFIG_ENV_SIZE SZ_16K 77 #define CONFIG_SYS_LOAD_ADDR 0x1000000 78 #define CONFIG_PREBOOT "usb start" 79 80 /* Shell */ 81 82 /* ATAGs support for bootm/bootz */ 83 #define CONFIG_SETUP_MEMORY_TAGS 84 #define CONFIG_CMDLINE_TAG 85 #define CONFIG_INITRD_TAG 86 87 /* Environment */ 88 #define ENV_DEVICE_SETTINGS \ 89 "stdin=serial,usbkbd\0" \ 90 "stdout=serial,vidconsole\0" \ 91 "stderr=serial,vidconsole\0" 92 93 /* 94 * Memory layout for where various images get loaded by boot scripts: 95 * 96 * I suspect address 0 is used as the SMP pen on the RPi2, so avoid this. 97 * 98 * Older versions of the boot firmware place the firmware-loaded DTB at 0x100, 99 * newer versions place it in high memory. So prevent U-Boot from doing its own 100 * DTB + initrd relocation so that we won't accidentally relocate the initrd 101 * over the firmware-loaded DTB and generally try to lay out things starting 102 * from the bottom of RAM. 103 * 104 * kernel_addr_r has different constraints on ARM and Aarch64. For 32-bit ARM, 105 * it must be within the first 128M of RAM in order for the kernel's 106 * CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed 107 * to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The 108 * decompressor also likes to relocate itself to right past the end of the 109 * decompressed kernel, so in total the sum of the compressed and and 110 * decompressed kernel needs to be reserved. 111 * 112 * For Aarch64, the kernel image is uncompressed and must be loaded at 113 * text_offset bytes (specified in the header of the Image) into a 2MB 114 * boundary. The 'booti' command relocates the image if necessary. Linux uses 115 * a default text_offset of 0x80000. In summary, loading at 0x80000 116 * satisfies all these constraints and reserving memory up to 0x02400000 117 * permits fairly large (roughly 36M) kernels. 118 * 119 * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't 120 * conflict with something else. Reserving 1M for each of them at 121 * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty. 122 * 123 * On ARM, both the DTB and any possible initrd must be loaded such that they 124 * fit inside the lowmem mapping in Linux. In practice, this usually means not 125 * more than ~700M away from the start of the kernel image but this number can 126 * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line 127 * parameter given to the kernel. So reserving memory from low to high 128 * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for 129 * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000. 130 * Even with the smallest possible CPU-GPU memory split of the CPU getting 131 * only 64M, the remaining 25M starting at 0x02700000 should allow quite 132 * large initrds before they start colliding with U-Boot. 133 */ 134 #define ENV_MEM_LAYOUT_SETTINGS \ 135 "fdt_high=ffffffff\0" \ 136 "initrd_high=ffffffff\0" \ 137 "kernel_addr_r=0x00080000\0" \ 138 "scriptaddr=0x02400000\0" \ 139 "pxefile_addr_r=0x02500000\0" \ 140 "fdt_addr_r=0x02600000\0" \ 141 "ramdisk_addr_r=0x02700000\0" 142 143 #define BOOT_TARGET_DEVICES(func) \ 144 func(MMC, mmc, 0) \ 145 func(USB, usb, 0) \ 146 func(PXE, pxe, na) \ 147 func(DHCP, dhcp, na) 148 #include <config_distro_bootcmd.h> 149 150 #define CONFIG_EXTRA_ENV_SETTINGS \ 151 "dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \ 152 ENV_DEVICE_SETTINGS \ 153 ENV_MEM_LAYOUT_SETTINGS \ 154 BOOTENV 155 156 157 #endif 158