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82 lines
2 KiB
ReStructuredText
82 lines
2 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0+:
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imxtract command
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================
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Synopsis
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--------
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::
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imxtract addr part [dest]
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imxtract addr uname [dest]
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Description
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-----------
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The imxtract command is used to extract a part of a multi-image file.
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Two different file formats are supported:
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* FIT images
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* legacy U-Boot images
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addr
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Address of the multi-image file from which a part shall be extracted
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part
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Index (hexadecimal) of the part of a legacy U-Boot image to be extracted
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uname
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Name of the part of a FIT image to be extracted
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dest
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Destination address (defaults to 0x0)
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The value of environment variable *verify* controls if the hashes and
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signatures of FIT images or the check sums of legacy U-Boot images are checked.
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To enable checking set *verify* to one of the values *1*, *yes*, *true*.
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(Actually only the first letter is checked disregarding the case.)
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To list the parts of an image the *iminfo* command can be used.
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Examples
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--------
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With verify=no incorrect hashes, signatures, or check sums don't stop the
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extraction. But correct hashes are still indicated in the output
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(here: md5, sha1).
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.. code-block:: console
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=> setenv verify no
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=> imxtract $loadaddr kernel-1 $kernel_addr_r
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## Copying 'kernel-1' subimage from FIT image at 40200000 ...
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md5+ sha1+ Loading part 0 ... OK
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=>
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With verify=yes incorrect hashes, signatures, or check sums stop the extraction.
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.. code-block:: console
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=> setenv verify yes
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=> imxtract $loadaddr kernel-1 $kernel_addr_r
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## Copying 'kernel-1' subimage from FIT image at 40200000 ...
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md5 error!
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Bad hash value for 'hash-1' hash node in 'kernel-1' image node
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Bad Data Hash
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=>
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Configuration
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-------------
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The imxtract command is only available if CONFIG_CMD_XIMG=y. Support for FIT
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images requires CONFIG_FIT=y. Support for legacy U-Boot images requires
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CONFIG_LEGACY_IMAGE_FORMAT=y.
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Return value
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------------
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On success the return value $? of the command is 0 (true). On failure the
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return value is 1 (false).
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