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 * 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.
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.
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.
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.
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.
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"
143 #define BOOT_TARGET_DEVICES(func) \
148 #include <config_distro_bootcmd.h>
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 \