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binman: doc: Add documentation for fdt_add_pubkey bintool

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Add documentation for btool which calls 'fdt_add_pubkey'

Signed-off-by: Lukas Funke <lukas.funke@weidmueller.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
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Lukas Funke 2023-07-18 13:53:12 +02:00 committed by Simon Glass
parent f0989c29f8
commit c76831d189
1 changed files with 10 additions and 0 deletions
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10
tools/binman/bintools.rst
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@ -194,3 +194,13 @@ Documentation is available via::
Bintool: fdt_add_pubkey: Add public key to device tree
------------------------------------------------------
This bintool supports running `fdt_add_pubkey` in order to add a public
key coming from a certificate to a device-tree.
Normally signing is done using `mkimage` in context of `binman sign`. However,
in this process the public key is not added to the stage before u-boot proper.
Using `fdt_add_pubkey` the key can be injected to the SPL independent of
`mkimage`