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| author | Simon Glass <sjg@chromium.org> | 2021-02-06 09:57:30 -0700 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2021-03-02 15:53:37 -0500 |
| commit | 008ae72c6946f85e9083118e750de68591f4ed12 (patch) | |
| tree | ade00896e5124da993c6ffbabe57bc77c7e74db5 /doc | |
| parent | 671c454368374b538fd0421d3da08ed59328099d (diff) | |
| download | u-boot-008ae72c6946f85e9083118e750de68591f4ed12.tar.gz u-boot-008ae72c6946f85e9083118e750de68591f4ed12.tar.xz u-boot-008ae72c6946f85e9083118e750de68591f4ed12.zip | |
doc: Add a note about producing 'md.b' output using hexdump
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>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/usage/md.rst | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/doc/usage/md.rst b/doc/usage/md.rst index 3951b0d58f..4c1073ea35 100644 --- a/doc/usage/md.rst +++ b/doc/usage/md.rst @@ -39,6 +39,16 @@ length number of values to dump. Defaults to 40 (0d64). Note that this is not the same as the number of bytes, unless .b is used. +Note that the format of 'md.b' can be emulated from linux with:: + + # This works but requires using sed to get the extra spaces + # <addr> is the address, <f> is the filename + xxd -o <addr> -g1 <f> |sed 's/ / /' >bad + + # This uses a single tool but the offset always starts at 0 + # <f> is the filename + hexdump -v -e '"%08.8_ax: " 16/1 "%02x " " "' -e '16/1 "%_p" "\n" ' <f> + Example ------- |