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 CFG_SYS_TIMER_RATE 1000000
21 #define CFG_SYS_TIMER_COUNTER \
22 (&((struct bcm2835_timer_regs *)BCM2835_TIMER_PHYSADDR)->clo)
26 #define CFG_SYS_SDRAM_BASE 0x00000000
27 #define CFG_SYS_UBOOT_BASE CONFIG_TEXT_BASE
29 * The board really has 256M. However, the VC (VideoCore co-processor) shares
30 * the RAM, and uses a configurable portion at the top. We tell U-Boot that a
31 * smaller amount of RAM is present in order to avoid stomping on the area
34 #define CFG_SYS_SDRAM_SIZE SZ_128M
39 /* DFU over USB/UDC */
42 #define KERNEL_FILENAME "Image"
44 #define KERNEL_FILENAME "zImage"
47 #define ENV_DFU_SETTINGS \
48 "dfu_alt_info=u-boot.bin fat 0 1;uboot.env fat 0 1;" \
49 "config.txt fat 0 1;" \
50 KERNEL_FILENAME " fat 0 1\0"
52 #define ENV_DFU_SETTINGS ""
55 /* Console configuration */
62 #define ENV_DEVICE_SETTINGS \
63 "stdin=serial,usbkbd\0" \
64 "stdout=serial,vidconsole\0" \
65 "stderr=serial,vidconsole\0"
68 #define FDT_HIGH "ffffffffffffffff"
69 #define INITRD_HIGH "ffffffffffffffff"
71 #define FDT_HIGH "ffffffff"
72 #define INITRD_HIGH "ffffffff"
76 * Memory layout for where various images get loaded by boot scripts:
78 * I suspect address 0 is used as the SMP pen on the RPi2, so avoid this.
80 * Older versions of the boot firmware place the firmware-loaded DTB at 0x100,
81 * newer versions place it in high memory. So prevent U-Boot from doing its own
82 * DTB + initrd relocation so that we won't accidentally relocate the initrd
83 * over the firmware-loaded DTB and generally try to lay out things starting
84 * from the bottom of RAM.
86 * kernel_addr_r has different constraints on ARM and Aarch64. For 32-bit ARM,
87 * it must be within the first 128M of RAM in order for the kernel's
88 * CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed
89 * to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The
90 * decompressor also likes to relocate itself to right past the end of the
91 * decompressed kernel, so in total the sum of the compressed and and
92 * decompressed kernel needs to be reserved.
94 * For Aarch64, the kernel image is uncompressed and must be loaded at
95 * text_offset bytes (specified in the header of the Image) into a 2MB
96 * boundary. The 'booti' command relocates the image if necessary. Linux uses
97 * a default text_offset of 0x80000. In summary, loading at 0x80000
98 * satisfies all these constraints and reserving memory up to 0x02400000
99 * permits fairly large (roughly 36M) kernels.
101 * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
102 * conflict with something else. Reserving 1M for each of them at
103 * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
105 * On ARM, both the DTB and any possible initrd must be loaded such that they
106 * fit inside the lowmem mapping in Linux. In practice, this usually means not
107 * more than ~700M away from the start of the kernel image but this number can
108 * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
109 * parameter given to the kernel. So reserving memory from low to high
110 * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
111 * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
112 * Even with the smallest possible CPU-GPU memory split of the CPU getting
113 * only 64M, the remaining 25M starting at 0x02700000 should allow quite
114 * large initrds before they start colliding with U-Boot.
116 #define ENV_MEM_LAYOUT_SETTINGS \
117 "fdt_high=" FDT_HIGH "\0" \
118 "initrd_high=" INITRD_HIGH "\0" \
119 "kernel_addr_r=0x00080000\0" \
120 "scriptaddr=0x02400000\0" \
121 "pxefile_addr_r=0x02500000\0" \
122 "fdt_addr_r=0x02600000\0" \
123 "ramdisk_addr_r=0x02700000\0"
125 #if CONFIG_IS_ENABLED(CMD_MMC)
126 #define BOOT_TARGET_MMC(func) \
131 #define BOOT_TARGET_MMC(func)
134 #if CONFIG_IS_ENABLED(CMD_USB)
135 #define BOOT_TARGET_USB(func) func(USB, usb, 0)
137 #define BOOT_TARGET_USB(func)
140 #if CONFIG_IS_ENABLED(CMD_PXE)
141 #define BOOT_TARGET_PXE(func) func(PXE, pxe, na)
143 #define BOOT_TARGET_PXE(func)
146 #if CONFIG_IS_ENABLED(CMD_DHCP)
147 #define BOOT_TARGET_DHCP(func) func(DHCP, dhcp, na)
149 #define BOOT_TARGET_DHCP(func)
152 #define BOOT_TARGET_DEVICES(func) \
153 BOOT_TARGET_MMC(func) \
154 BOOT_TARGET_USB(func) \
155 BOOT_TARGET_PXE(func) \
156 BOOT_TARGET_DHCP(func)
158 #include <config_distro_bootcmd.h>
160 #define CONFIG_EXTRA_ENV_SETTINGS \
161 "dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \
162 ENV_DEVICE_SETTINGS \
164 ENV_MEM_LAYOUT_SETTINGS \