mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-13 06:42:56 +00:00
78 lines
3 KiB
Bash
78 lines
3 KiB
Bash
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/* SPDX-License-Identifier: GPL-2.0+ */
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/* environment for Raspberry Pi boards */
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dhcpuboot=usb start; dhcp u-boot.uimg; bootm
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/* Environment */
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stdin=serial,usbkbd
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stdout=serial,vidconsole
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stderr=serial,vidconsole
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/* DFU over USB/UDC */
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#ifdef CONFIG_CMD_DFU
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dfu_alt_info=u-boot.bin fat 0 1;uboot.env fat 0 1;
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config.txt fat 0 1;
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#ifdef CONFIG_ARM64
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dfu_alt_info+=Image fat 0 1
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#else
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dfu_alt_info+=zImage fat 0 1
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#endif
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#endif /* CONFIG_CMD_DFU */
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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
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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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#ifdef CONFIG_ARM64
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fdt_high=ffffffffffffffff
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initrd_high=ffffffffffffffff
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#else
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fdt_high=ffffffff
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initrd_high=ffffffff
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#endif
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kernel_addr_r=0x00080000
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scriptaddr=0x02400000
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pxefile_addr_r=0x02500000
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fdt_addr_r=0x02600000
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ramdisk_addr_r=0x02700000
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boot_targets=mmc usb pxe dhcp
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