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008ae72c69
Comparing a hex dump on the U-Boot command line with the contents of a file on the host system is fairly easy and convenient to do manually if it is small. But the format used hexdump by default differs from that shown by U-Boot. Add a note about how to make them the same. (For large dumps, writing the data to the network with tftpput, or to a USB stick with ext4save is easiest.) Signed-off-by: Simon Glass <sjg@chromium.org>
107 lines
3.8 KiB
ReStructuredText
107 lines
3.8 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+:
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md command
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==========
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Synopis
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-------
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::
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md <address>[<data_size>] [<length>]
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Description
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-----------
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The md command is used to dump the contents of memory. It uses a standard
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format that includes the address, hex data and ASCII display. It supports
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various data sizes and uses the endianness of the target.
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The specified data_size and length become the defaults for future memory
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commands commands.
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address
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start address to display
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data_size
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size of each value to display (defaults to .l):
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========= ===================
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data_size Output size
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========= ===================
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.b byte
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.w word (16 bits)
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.l long (32 bits)
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.q quadword (64 bits)
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========= ===================
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length
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number of values to dump. Defaults to 40 (0d64). Note that this is not
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the same as the number of bytes, unless .b is used.
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Note that the format of 'md.b' can be emulated from linux with::
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# This works but requires using sed to get the extra spaces
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# <addr> is the address, <f> is the filename
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xxd -o <addr> -g1 <f> |sed 's/ / /' >bad
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# This uses a single tool but the offset always starts at 0
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# <f> is the filename
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hexdump -v -e '"%08.8_ax: " 16/1 "%02x " " "' -e '16/1 "%_p" "\n" ' <f>
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Example
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-------
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::
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=> md 10000
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00010000: 00010000 00000000 f0f30f00 00005596 .............U..
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00010010: 10011010 00000000 10011010 00000000 ................
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00010020: 10011050 00000000 b96d4cd8 00007fff P........Lm.....
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00010030: 00000000 00000000 f0f30f18 00005596 .............U..
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00010040: 10011040 00000000 10011040 00000000 @.......@.......
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00010050: b96d4cd8 00007fff 10011020 00000000 .Lm..... .......
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00010060: 00000003 000000c3 00000000 00000000 ................
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00010070: 00000000 00000000 f0e892f3 00005596 .............U..
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00010080: 00000000 000000a1 00000000 00000000 ................
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00010090: 00000000 00000000 f0e38aa6 00005596 .............U..
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000100a0: 00000000 000000a6 00000022 00000000 ........".......
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000100b0: 00000001 00000000 f0e38aa1 00005596 .............U..
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000100c0: 00000000 000000be 00000000 00000000 ................
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000100d0: 00000000 00000000 00000000 00000000 ................
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000100e0: 00000000 00000000 00000000 00000000 ................
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000100f0: 00000000 00000000 00000000 00000000 ................
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=> md.b 10000
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00010000: 00 00 01 00 00 00 00 00 00 0f f3 f0 96 55 00 00 .............U..
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00010010: 10 10 01 10 00 00 00 00 10 10 01 10 00 00 00 00 ................
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00010020: 50 10 01 10 00 00 00 00 d8 4c 6d b9 ff 7f 00 00 P........Lm.....
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00010030: 00 00 00 00 00 00 00 00 18 0f f3 f0 96 55 00 00 .............U..
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=> md.b 10000 10
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00010000: 00 00 01 00 00 00 00 00 00 0f f3 f0 96 55 00 00 .............U..
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=>
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00010010: 10 10 01 10 00 00 00 00 10 10 01 10 00 00 00 00 ................
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=>
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00010020: 50 10 01 10 00 00 00 00 d8 4c 6d b9 ff 7f 00 00 P........Lm.....
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=>
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=> md.q 10000
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00010000: 0000000000010000 00005596f0f30f00 .............U..
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00010010: 0000000010011010 0000000010011010 ................
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00010020: 0000000010011050 00007fffb96d4cd8 P........Lm.....
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00010030: 0000000000000000 00005596f0f30f18 .............U..
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00010040: 0000000010011040 0000000010011040 @.......@.......
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00010050: 00007fffb96d4cd8 0000000010011020 .Lm..... .......
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00010060: 000000c300000003 0000000000000000 ................
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00010070: 0000000000000000 00005596f0e892f3 .............U..
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The empty commands cause a 'repeat', so that md shows the next available data
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in the same format as before.
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Return value
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------------
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The return value $? is always 0 (true).
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