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34e452dd02
Currently all shell command docs are put in the doc/usage root. Let's group them into cmd/ sub-directory. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
80 lines
1.9 KiB
ReStructuredText
80 lines
1.9 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+:
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fatload command
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===============
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Synopsis
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--------
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::
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fatload <interface> [<dev[:part]> [<addr> [<filename> [bytes [pos]]]]]
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Description
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-----------
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The fatload command is used to read a file from a FAT filesystem into memory.
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You can always use the :doc:`load command <load>` instead.
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The number of transferred bytes is saved in the environment variable filesize.
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The load address is saved in the environment variable fileaddr.
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interface
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interface for accessing the block device (mmc, sata, scsi, usb, ....)
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dev
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device number
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part
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partition number, defaults to 0 (whole device)
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addr
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load address, defaults to environment variable loadaddr or if loadaddr is
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not set to configuration variable CONFIG_SYS_LOAD_ADDR
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filename
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path to file, defaults to environment variable bootfile
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bytes
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maximum number of bytes to load
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pos
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number of bytes to skip
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addr, bytes, pos are hexadecimal numbers.
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If either 'pos' or 'bytes' are not aligned according to the minimum alignment
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requirement for DMA transfer (ARCH_DMA_MINALIGN) additional buffering will be
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used, a misaligned buffer warning will be printed, and performance will suffer
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for the load.
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Example
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-------
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::
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=> fatload mmc 0:1 ${kernel_addr_r} snp.efi
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149280 bytes read in 11 ms (12.9 MiB/s)
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=>
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=> fatload mmc 0:1 ${kernel_addr_r} snp.efi 1000000
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149280 bytes read in 9 ms (15.8 MiB/s)
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=>
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=> fatload mmc 0:1 ${kernel_addr_r} snp.efi 1000000 100
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149024 bytes read in 10 ms (14.2 MiB/s)
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=>
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=> fatload mmc 0:1 ${kernel_addr_r} snp.efi 10
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16 bytes read in 1 ms (15.6 KiB/s)
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=>
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Configuration
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-------------
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The fatload command is only available if CONFIG_CMD_FAT=y.
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Return value
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------------
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The return value $? is set to 0 (true) if the file was successfully loaded
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even if the number of bytes is less then the specified length.
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If an error occurs, the return value $? is set to 1 (false).
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