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>
13 #include <asm/arch/base.h>
16 /* Architecture, CPU, etc.*/
18 /* Use SoC timer for AArch32, but architected timer for AArch64 */
20 #define CONFIG_SYS_TIMER_RATE 1000000
21 #define CONFIG_SYS_TIMER_COUNTER \
22 (&((struct bcm2835_timer_regs *)BCM2835_TIMER_PHYSADDR)->clo)
26 * 2835 is a SKU in a series for which the 2708 is the first or primary SoC,
27 * so 2708 has historically been used rather than a dedicated 2835 ID.
29 * We don't define a machine type for bcm2709/bcm2836 since the RPi Foundation
30 * chose to use someone else's previously registered machine ID (3139, MX51_GGC)
31 * rather than obtaining a valid ID:-/
33 * For the bcm2837, hopefully a machine type is not needed, since everything
37 #define CONFIG_MACH_TYPE MACH_TYPE_BCM2708
41 #define CONFIG_SYS_SDRAM_BASE 0x00000000
42 #define CONFIG_SYS_UBOOT_BASE CONFIG_SYS_TEXT_BASE
44 * The board really has 256M. However, the VC (VideoCore co-processor) shares
45 * the RAM, and uses a configurable portion at the top. We tell U-Boot that a
46 * smaller amount of RAM is present in order to avoid stomping on the area
49 #define CONFIG_SYS_SDRAM_SIZE SZ_128M
50 #define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + \
51 CONFIG_SYS_SDRAM_SIZE - \
52 GENERATED_GBL_DATA_SIZE)
55 #define CONFIG_SYS_BOOTM_LEN SZ_64M
60 #define CONFIG_BCM2835_GPIO
62 #define CONFIG_LCD_DT_SIMPLEFB
63 #define CONFIG_VIDEO_BCM2835
65 /* DFU over USB/UDC */
68 #define KERNEL_FILENAME "Image"
70 #define KERNEL_FILENAME "zImage"
73 #define ENV_DFU_SETTINGS \
74 "dfu_alt_info=u-boot.bin fat 0 1;uboot.env fat 0 1;" \
75 "config.txt fat 0 1;" \
76 KERNEL_FILENAME " fat 0 1\0"
78 #define ENV_DFU_SETTINGS ""
81 /* Console configuration */
82 #define CONFIG_SYS_CBSIZE 1024
88 /* ATAGs support for bootm/bootz */
89 #define CONFIG_SETUP_MEMORY_TAGS
90 #define CONFIG_CMDLINE_TAG
91 #define CONFIG_INITRD_TAG
94 #define ENV_DEVICE_SETTINGS \
95 "stdin=serial,usbkbd\0" \
96 "stdout=serial,vidconsole\0" \
97 "stderr=serial,vidconsole\0"
100 #define FDT_HIGH "ffffffffffffffff"
101 #define INITRD_HIGH "ffffffffffffffff"
103 #define FDT_HIGH "ffffffff"
104 #define INITRD_HIGH "ffffffff"
108 * Memory layout for where various images get loaded by boot scripts:
110 * I suspect address 0 is used as the SMP pen on the RPi2, so avoid this.
112 * Older versions of the boot firmware place the firmware-loaded DTB at 0x100,
113 * newer versions place it in high memory. So prevent U-Boot from doing its own
114 * DTB + initrd relocation so that we won't accidentally relocate the initrd
115 * over the firmware-loaded DTB and generally try to lay out things starting
116 * from the bottom of RAM.
118 * kernel_addr_r has different constraints on ARM and Aarch64. For 32-bit ARM,
119 * it must be within the first 128M of RAM in order for the kernel's
120 * CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed
121 * to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The
122 * decompressor also likes to relocate itself to right past the end of the
123 * decompressed kernel, so in total the sum of the compressed and and
124 * decompressed kernel needs to be reserved.
126 * For Aarch64, the kernel image is uncompressed and must be loaded at
127 * text_offset bytes (specified in the header of the Image) into a 2MB
128 * boundary. The 'booti' command relocates the image if necessary. Linux uses
129 * a default text_offset of 0x80000. In summary, loading at 0x80000
130 * satisfies all these constraints and reserving memory up to 0x02400000
131 * permits fairly large (roughly 36M) kernels.
133 * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
134 * conflict with something else. Reserving 1M for each of them at
135 * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
137 * On ARM, both the DTB and any possible initrd must be loaded such that they
138 * fit inside the lowmem mapping in Linux. In practice, this usually means not
139 * more than ~700M away from the start of the kernel image but this number can
140 * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
141 * parameter given to the kernel. So reserving memory from low to high
142 * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
143 * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
144 * Even with the smallest possible CPU-GPU memory split of the CPU getting
145 * only 64M, the remaining 25M starting at 0x02700000 should allow quite
146 * large initrds before they start colliding with U-Boot.
148 #define ENV_MEM_LAYOUT_SETTINGS \
149 "fdt_high=" FDT_HIGH "\0" \
150 "initrd_high=" INITRD_HIGH "\0" \
151 "kernel_addr_r=0x00080000\0" \
152 "scriptaddr=0x02400000\0" \
153 "pxefile_addr_r=0x02500000\0" \
154 "fdt_addr_r=0x02600000\0" \
155 "ramdisk_addr_r=0x02700000\0"
157 #if CONFIG_IS_ENABLED(CMD_MMC)
158 #define BOOT_TARGET_MMC(func) \
162 #define BOOT_TARGET_MMC(func)
165 #if CONFIG_IS_ENABLED(CMD_USB)
166 #define BOOT_TARGET_USB(func) func(USB, usb, 0)
168 #define BOOT_TARGET_USB(func)
171 #if CONFIG_IS_ENABLED(CMD_PXE)
172 #define BOOT_TARGET_PXE(func) func(PXE, pxe, na)
174 #define BOOT_TARGET_PXE(func)
177 #if CONFIG_IS_ENABLED(CMD_DHCP)
178 #define BOOT_TARGET_DHCP(func) func(DHCP, dhcp, na)
180 #define BOOT_TARGET_DHCP(func)
183 #define BOOT_TARGET_DEVICES(func) \
184 BOOT_TARGET_MMC(func) \
185 BOOT_TARGET_USB(func) \
186 BOOT_TARGET_PXE(func) \
187 BOOT_TARGET_DHCP(func)
189 #include <config_distro_bootcmd.h>
191 #define CONFIG_EXTRA_ENV_SETTINGS \
192 "dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \
193 ENV_DEVICE_SETTINGS \
195 ENV_MEM_LAYOUT_SETTINGS \