1 /* SPDX-License-Identifier: GPL-2.0 */
3 * (C) Copyright 2012-2016 Stephen Warren
9 #include <linux/sizes.h>
10 #include <asm/arch/timer.h>
12 #if defined(CONFIG_TARGET_RPI_2) || defined(CONFIG_TARGET_RPI_3_32B)
13 #define CONFIG_SKIP_LOWLEVEL_INIT
16 /* Architecture, CPU, etc.*/
17 #define CONFIG_ARCH_CPU_INIT
19 /* Use SoC timer for AArch32, but architected timer for AArch64 */
21 #define CONFIG_SYS_TIMER_RATE 1000000
22 #define CONFIG_SYS_TIMER_COUNTER \
23 (&((struct bcm2835_timer_regs *)BCM2835_TIMER_PHYSADDR)->clo)
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.
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:-/
34 * For the bcm2837, hopefully a machine type is not needed, since everything
38 #define CONFIG_MACH_TYPE MACH_TYPE_BCM2708
42 #define CONFIG_NR_DRAM_BANKS 1
43 #define CONFIG_SYS_SDRAM_BASE 0x00000000
44 #define CONFIG_SYS_UBOOT_BASE CONFIG_SYS_TEXT_BASE
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
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
62 #define CONFIG_BCM2835_GPIO
64 #define CONFIG_LCD_DT_SIMPLEFB
65 #define CONFIG_VIDEO_BCM2835
68 #define CONFIG_TFTP_TSIZE
69 #define CONFIG_MISC_INIT_R
72 /* Console configuration */
73 #define CONFIG_SYS_CBSIZE 1024
76 #define CONFIG_ENV_SIZE SZ_16K
77 #define CONFIG_SYS_LOAD_ADDR 0x1000000
78 #define CONFIG_PREBOOT "usb start"
82 /* ATAGs support for bootm/bootz */
83 #define CONFIG_SETUP_MEMORY_TAGS
84 #define CONFIG_CMDLINE_TAG
85 #define CONFIG_INITRD_TAG
88 #define ENV_DEVICE_SETTINGS \
89 "stdin=serial,usbkbd\0" \
90 "stdout=serial,vidconsole\0" \
91 "stderr=serial,vidconsole\0"
94 * Memory layout for where various images get loaded by boot scripts:
96 * I suspect address 0 is used as the SMP pen on the RPi2, so avoid this.
98 * fdt_addr_r simply shouldn't overlap anything else. However, the RPi's
99 * binary firmware loads a DT to address 0x100, so we choose this address to
100 * match it. This allows custom boot scripts to pass this DT on to Linux
101 * simply by not over-writing the data at this address. When using U-Boot,
102 * U-Boot (and scripts it executes) typicaly ignore the DT loaded by the FW
103 * and loads its own DT from disk (triggered by boot.scr or extlinux.conf).
105 * pxefile_addr_r can be pretty much anywhere that doesn't conflict with
106 * something else. Put it low in memory to avoid conflicts.
108 * kernel_addr_r must be within the first 128M of RAM in order for the
109 * kernel's CONFIG_AUTO_ZRELADDR option to work. Since the kernel will
110 * decompress itself to 0x8000 after the start of RAM, kernel_addr_r
111 * should not overlap that area, or the kernel will have to copy itself
112 * somewhere else before decompression. Similarly, the address of any other
113 * data passed to the kernel shouldn't overlap the start of RAM. Pushing
114 * this up to 16M allows for a sizable kernel to be decompressed below the
115 * compressed load address.
117 * scriptaddr can be pretty much anywhere that doesn't conflict with something
118 * else. Choosing 32M allows for the compressed kernel to be up to 16M.
120 * ramdisk_addr_r simply shouldn't overlap anything else. Choosing 33M allows
121 * for any boot script to be up to 1M, which is hopefully plenty.
123 #define ENV_MEM_LAYOUT_SETTINGS \
124 "fdt_high=ffffffff\0" \
125 "initrd_high=ffffffff\0" \
126 "fdt_addr_r=0x00000100\0" \
127 "pxefile_addr_r=0x00100000\0" \
128 "kernel_addr_r=0x01000000\0" \
129 "scriptaddr=0x02000000\0" \
130 "ramdisk_addr_r=0x02100000\0" \
132 #define BOOT_TARGET_DEVICES(func) \
137 #include <config_distro_bootcmd.h>
139 #define CONFIG_EXTRA_ENV_SETTINGS \
140 "dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \
141 ENV_DEVICE_SETTINGS \
142 ENV_MEM_LAYOUT_SETTINGS \