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binman: doc: Add documentation for fdt_add_pubkey bintool
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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@ -194,3 +194,13 @@ Documentation is available via::
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Bintool: fdt_add_pubkey: Add public key to device tree
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This bintool supports running `fdt_add_pubkey` in order to add a public
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key coming from a certificate to a device-tree.
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Normally signing is done using `mkimage` in context of `binman sign`. However,
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in this process the public key is not added to the stage before u-boot proper.
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Using `fdt_add_pubkey` the key can be injected to the SPL independent of
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`mkimage`
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