165 lines
5.4 KiB
C
165 lines
5.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* (C) Copyright 2012-2016 Stephen Warren
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*/
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#ifndef __CONFIG_H
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#define __CONFIG_H
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#include <linux/sizes.h>
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#include <asm/arch/timer.h>
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#if defined(CONFIG_TARGET_RPI_2) || defined(CONFIG_TARGET_RPI_3_32B)
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#define CONFIG_SKIP_LOWLEVEL_INIT
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#endif
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/* Architecture, CPU, etc.*/
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#define CONFIG_ARCH_CPU_INIT
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/* Use SoC timer for AArch32, but architected timer for AArch64 */
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#ifndef CONFIG_ARM64
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#define CONFIG_SYS_TIMER_RATE 1000000
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#define CONFIG_SYS_TIMER_COUNTER \
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(&((struct bcm2835_timer_regs *)BCM2835_TIMER_PHYSADDR)->clo)
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#endif
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/*
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* 2835 is a SKU in a series for which the 2708 is the first or primary SoC,
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* so 2708 has historically been used rather than a dedicated 2835 ID.
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*
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* We don't define a machine type for bcm2709/bcm2836 since the RPi Foundation
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* chose to use someone else's previously registered machine ID (3139, MX51_GGC)
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* rather than obtaining a valid ID:-/
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*
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* For the bcm2837, hopefully a machine type is not needed, since everything
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* is DT.
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*/
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#ifdef CONFIG_BCM2835
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#define CONFIG_MACH_TYPE MACH_TYPE_BCM2708
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#endif
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/* Memory layout */
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#define CONFIG_SYS_SDRAM_BASE 0x00000000
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#define CONFIG_SYS_UBOOT_BASE CONFIG_SYS_TEXT_BASE
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/*
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* The board really has 256M. However, the VC (VideoCore co-processor) shares
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* the RAM, and uses a configurable portion at the top. We tell U-Boot that a
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* smaller amount of RAM is present in order to avoid stomping on the area
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* the VC uses.
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*/
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#define CONFIG_SYS_SDRAM_SIZE SZ_128M
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#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + \
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CONFIG_SYS_SDRAM_SIZE - \
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GENERATED_GBL_DATA_SIZE)
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#define CONFIG_SYS_MALLOC_LEN SZ_4M
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#define CONFIG_SYS_MEMTEST_START 0x00100000
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#define CONFIG_SYS_MEMTEST_END 0x00200000
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#define CONFIG_LOADADDR 0x00200000
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/* Devices */
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/* GPIO */
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#define CONFIG_BCM2835_GPIO
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/* LCD */
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#define CONFIG_LCD_DT_SIMPLEFB
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#define CONFIG_VIDEO_BCM2835
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#ifdef CONFIG_CMD_USB
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#define CONFIG_TFTP_TSIZE
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#endif
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/* Console configuration */
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#define CONFIG_SYS_CBSIZE 1024
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/* Environment */
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#define CONFIG_ENV_SIZE SZ_16K
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#define CONFIG_SYS_LOAD_ADDR 0x1000000
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#define CONFIG_PREBOOT "usb start"
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/* Shell */
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/* ATAGs support for bootm/bootz */
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#define CONFIG_SETUP_MEMORY_TAGS
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#define CONFIG_CMDLINE_TAG
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#define CONFIG_INITRD_TAG
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/* Environment */
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#define ENV_DEVICE_SETTINGS \
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"stdin=serial,usbkbd\0" \
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"stdout=serial,vidconsole\0" \
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"stderr=serial,vidconsole\0"
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#ifdef CONFIG_ARM64
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#define FDT_HIGH "ffffffffffffffff"
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#define INITRD_HIGH "ffffffffffffffff"
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#else
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#define FDT_HIGH "ffffffff"
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#define INITRD_HIGH "ffffffff"
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#endif
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/*
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* Memory layout for where various images get loaded by boot scripts:
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*
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* I suspect address 0 is used as the SMP pen on the RPi2, so avoid this.
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*
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* Older versions of the boot firmware place the firmware-loaded DTB at 0x100,
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* newer versions place it in high memory. So prevent U-Boot from doing its own
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* DTB + initrd relocation so that we won't accidentally relocate the initrd
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* over the firmware-loaded DTB and generally try to lay out things starting
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* from the bottom of RAM.
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*
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* kernel_addr_r has different constraints on ARM and Aarch64. For 32-bit ARM,
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* it must be within the first 128M of RAM in order for the kernel's
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* CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed
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* to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The
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* decompressor also likes to relocate itself to right past the end of the
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* decompressed kernel, so in total the sum of the compressed and and
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* decompressed kernel needs to be reserved.
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*
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* For Aarch64, the kernel image is uncompressed and must be loaded at
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* text_offset bytes (specified in the header of the Image) into a 2MB
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* boundary. The 'booti' command relocates the image if necessary. Linux uses
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* a default text_offset of 0x80000. In summary, loading at 0x80000
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* satisfies all these constraints and reserving memory up to 0x02400000
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* permits fairly large (roughly 36M) kernels.
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*
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* scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
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* conflict with something else. Reserving 1M for each of them at
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* 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
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*
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* On ARM, both the DTB and any possible initrd must be loaded such that they
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* fit inside the lowmem mapping in Linux. In practice, this usually means not
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* more than ~700M away from the start of the kernel image but this number can
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* be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
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* parameter given to the kernel. So reserving memory from low to high
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* satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
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* the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
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* Even with the smallest possible CPU-GPU memory split of the CPU getting
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* only 64M, the remaining 25M starting at 0x02700000 should allow quite
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* large initrds before they start colliding with U-Boot.
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*/
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#define ENV_MEM_LAYOUT_SETTINGS \
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"fdt_high=" FDT_HIGH "\0" \
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"initrd_high=" INITRD_HIGH "\0" \
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"kernel_addr_r=0x00080000\0" \
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"scriptaddr=0x02400000\0" \
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"pxefile_addr_r=0x02500000\0" \
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"fdt_addr_r=0x02600000\0" \
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"ramdisk_addr_r=0x02700000\0"
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#define BOOT_TARGET_DEVICES(func) \
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func(MMC, mmc, 0) \
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func(MMC, mmc, 1) \
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func(USB, usb, 0) \
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func(PXE, pxe, na) \
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func(DHCP, dhcp, na)
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#include <config_distro_bootcmd.h>
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#define CONFIG_EXTRA_ENV_SETTINGS \
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"dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \
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ENV_DEVICE_SETTINGS \
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ENV_MEM_LAYOUT_SETTINGS \
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BOOTENV
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#endif
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