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 #define CONFIG_SYS_SDRAM_BASE 0x00000000
27 #define CONFIG_SYS_UBOOT_BASE CONFIG_SYS_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 CONFIG_SYS_SDRAM_SIZE SZ_128M
35 #define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + \
36 CONFIG_SYS_SDRAM_SIZE - \
37 GENERATED_GBL_DATA_SIZE)
40 #define CONFIG_SYS_BOOTM_LEN SZ_64M
45 #define CONFIG_BCM2835_GPIO
47 #define CONFIG_LCD_DT_SIMPLEFB
48 #define CONFIG_VIDEO_BCM2835
50 /* DFU over USB/UDC */
53 #define KERNEL_FILENAME "Image"
55 #define KERNEL_FILENAME "zImage"
58 #define ENV_DFU_SETTINGS \
59 "dfu_alt_info=u-boot.bin fat 0 1;uboot.env fat 0 1;" \
60 "config.txt fat 0 1;" \
61 KERNEL_FILENAME " fat 0 1\0"
63 #define ENV_DFU_SETTINGS ""
66 /* Console configuration */
67 #define CONFIG_SYS_CBSIZE 1024
74 #define ENV_DEVICE_SETTINGS \
75 "stdin=serial,usbkbd\0" \
76 "stdout=serial,vidconsole\0" \
77 "stderr=serial,vidconsole\0"
80 #define FDT_HIGH "ffffffffffffffff"
81 #define INITRD_HIGH "ffffffffffffffff"
83 #define FDT_HIGH "ffffffff"
84 #define INITRD_HIGH "ffffffff"
88 * Memory layout for where various images get loaded by boot scripts:
90 * I suspect address 0 is used as the SMP pen on the RPi2, so avoid this.
92 * Older versions of the boot firmware place the firmware-loaded DTB at 0x100,
93 * newer versions place it in high memory. So prevent U-Boot from doing its own
94 * DTB + initrd relocation so that we won't accidentally relocate the initrd
95 * over the firmware-loaded DTB and generally try to lay out things starting
96 * from the bottom of RAM.
98 * kernel_addr_r has different constraints on ARM and Aarch64. For 32-bit ARM,
99 * it must be within the first 128M of RAM in order for the kernel's
100 * CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed
101 * to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The
102 * decompressor also likes to relocate itself to right past the end of the
103 * decompressed kernel, so in total the sum of the compressed and and
104 * decompressed kernel needs to be reserved.
106 * For Aarch64, the kernel image is uncompressed and must be loaded at
107 * text_offset bytes (specified in the header of the Image) into a 2MB
108 * boundary. The 'booti' command relocates the image if necessary. Linux uses
109 * a default text_offset of 0x80000. In summary, loading at 0x80000
110 * satisfies all these constraints and reserving memory up to 0x02400000
111 * permits fairly large (roughly 36M) kernels.
113 * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
114 * conflict with something else. Reserving 1M for each of them at
115 * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
117 * On ARM, both the DTB and any possible initrd must be loaded such that they
118 * fit inside the lowmem mapping in Linux. In practice, this usually means not
119 * more than ~700M away from the start of the kernel image but this number can
120 * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
121 * parameter given to the kernel. So reserving memory from low to high
122 * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
123 * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
124 * Even with the smallest possible CPU-GPU memory split of the CPU getting
125 * only 64M, the remaining 25M starting at 0x02700000 should allow quite
126 * large initrds before they start colliding with U-Boot.
128 #define ENV_MEM_LAYOUT_SETTINGS \
129 "fdt_high=" FDT_HIGH "\0" \
130 "initrd_high=" INITRD_HIGH "\0" \
131 "kernel_addr_r=0x00080000\0" \
132 "scriptaddr=0x02400000\0" \
133 "pxefile_addr_r=0x02500000\0" \
134 "fdt_addr_r=0x02600000\0" \
135 "ramdisk_addr_r=0x02700000\0"
137 #if CONFIG_IS_ENABLED(CMD_MMC)
138 #define BOOT_TARGET_MMC(func) \
142 #define BOOT_TARGET_MMC(func)
145 #if CONFIG_IS_ENABLED(CMD_USB)
146 #define BOOT_TARGET_USB(func) func(USB, usb, 0)
148 #define BOOT_TARGET_USB(func)
151 #if CONFIG_IS_ENABLED(CMD_PXE)
152 #define BOOT_TARGET_PXE(func) func(PXE, pxe, na)
154 #define BOOT_TARGET_PXE(func)
157 #if CONFIG_IS_ENABLED(CMD_DHCP)
158 #define BOOT_TARGET_DHCP(func) func(DHCP, dhcp, na)
160 #define BOOT_TARGET_DHCP(func)
163 #define BOOT_TARGET_DEVICES(func) \
164 BOOT_TARGET_MMC(func) \
165 BOOT_TARGET_USB(func) \
166 BOOT_TARGET_PXE(func) \
167 BOOT_TARGET_DHCP(func)
169 #include <config_distro_bootcmd.h>
171 #define CONFIG_EXTRA_ENV_SETTINGS \
172 "dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \
173 ENV_DEVICE_SETTINGS \
175 ENV_MEM_LAYOUT_SETTINGS \