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115 lines
3.1 KiB
ReStructuredText
115 lines
3.1 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0+:
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booti command
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=============
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Synopsis
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--------
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::
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booti [<addr> [<initrd>[:<size>]] [<fdt>]]
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Description
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-----------
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The booti command is used to boot a Linux kernel in flat or compressed
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'Image' format. Which compressed formats are supported is configurable.
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addr
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address of kernel image, defaults to CONFIG_SYS_LOAD_ADDR.
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initrd
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address of the initial RAM disk. Use '-' to boot a kernel with a device
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tree but without an initial RAM disk.
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size
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size of the initial RAM disk. This parameter must be specified for raw
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initial RAM disks.
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fdt
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address of the device tree.
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To support compressed Image files the following environment variables must be
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set:
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kernel_comp_addr_r
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start of memory area used for decompression
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kernel_comp_size
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size of the compressed file. The value has to be at least the size of
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loaded image for decompression to succeed. For the booti command the
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maximum decompressed size is 10 times this value.
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Example
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-------
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This is the boot log of an Odroid C2 board:
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::
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=> load mmc 0:1 $fdt_addr_r dtb-5.10.0-3-arm64
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27530 bytes read in 7 ms (3.7 MiB/s)
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=> load mmc 0:1 $kernel_addr_r vmlinuz-5.10.0-3-arm64
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26990448 bytes read in 1175 ms (21.9 MiB/s)
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=> load mmc 0:1 $ramdisk_addr_r initrd.img-5.10.0-3-arm64
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27421776 bytes read in 1209 ms (21.6 MiB/s)
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=> booti $kernel_addr_r $ramdisk_addr_r:$filesize $fdt_addr_r
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Moving Image from 0x8080000 to 0x8200000, end=9c60000
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## Flattened Device Tree blob at 08008000
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Booting using the fdt blob at 0x8008000
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Loading Ramdisk to 7a52a000, end 7bf50c50 ... OK
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Loading Device Tree to 000000007a520000, end 000000007a529b89 ... OK
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Starting kernel ...
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The kernel can be compressed with gzip:
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.. code-block:: bash
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cd /boot
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gzip -k vmlinuz-5.10.0-3-arm64
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Here is the boot log for the compressed kernel:
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::
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=> setenv kernel_comp_addr_r 0x50000000
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=> setenv kernel_comp_size 0x04000000
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=> load mmc 0:1 $fdt_addr_r dtb-5.10.0-3-arm64
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27530 bytes read in 6 ms (4.4 MiB/s)
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=> load mmc 0:1 $kernel_addr_r vmlinuz-5.10.0-3-arm64.gz
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9267730 bytes read in 402 ms (22 MiB/s)
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=> load mmc 0:1 $ramdisk_addr_r initrd.img-5.10.0-3-arm64
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27421776 bytes read in 1181 ms (22.1 MiB/s)
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=> booti $kernel_addr_r $ramdisk_addr_r:$filesize $fdt_addr_r
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Uncompressing Kernel Image
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Moving Image from 0x8080000 to 0x8200000, end=9c60000
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## Flattened Device Tree blob at 08008000
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Booting using the fdt blob at 0x8008000
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Loading Ramdisk to 7a52a000, end 7bf50c50 ... OK
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Loading Device Tree to 000000007a520000, end 000000007a529b89 ... OK
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Starting kernel ...
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Configuration
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-------------
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The booti command is only available if CONFIG_CMD_BOOTI=y.
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Which compression types are supported depends on:
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* CONFIG_BZIP2
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* CONFIG_GZIP
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* CONFIG_LZ4
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* CONFIG_LZMA
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* CONFIG_LZO
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* CONFIG_ZSTD
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Return value
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------------
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Normally this command does not return. If an error occurs, the return value $?
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is set to 1 (false). If the operating system returns to U-Boot, the system is
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reset.
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