From patchwork Tue May 26 10:44:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Heiko Stuebner X-Patchwork-Id: 246578 List-Id: U-Boot discussion From: heiko at sntech.de (Heiko Stuebner) Date: Tue, 26 May 2020 12:44:11 +0200 Subject: [PATCH v3 4/5] spl: fit: add Kconfig option to specify key-hint for fit_generator In-Reply-To: <20200526104412.3666210-1-heiko@sntech.de> References: <20200526104412.3666210-1-heiko@sntech.de> Message-ID: <20200526104412.3666210-5-heiko@sntech.de> From: Heiko Stuebner The u-boot.itb can be generated either from a static .its that can simply include the needed signature nodes with key-hints or from a fit-generator script referenced in CONFIG_SPL_FIT_GENERATOR. In the script-case it will need to know what key to include for the key-hint and specified algorithm, so add an option for that key-name. Signed-off-by: Heiko Stuebner Reviewed-by: Philipp Tomsich Reviewed-by: Simon Glass Reviewed-by: Kever Yang --- changes in v2: - add doc snippet explaining the option Kconfig | 8 ++++++++ doc/uImage.FIT/howto.txt | 13 +++++++++++++ 2 files changed, 21 insertions(+) diff --git a/Kconfig b/Kconfig index bab7c4f3ee..6a9bf8d865 100644 --- a/Kconfig +++ b/Kconfig @@ -548,6 +548,14 @@ config SPL_FIT_GENERATOR passed a list of supported device tree file stub names to include in the generated image. +config SPL_FIT_GENERATOR_KEY_HINT + string "key hint for signing U-Boot FIT image" + depends on SPL_FIT_SIGNATURE + default "dev" + help + The key hint to store in both the generated .its file as well as + u-boot-key.dtb generated separately and embedded into the SPL. + endif # SPL endif # FIT diff --git a/doc/uImage.FIT/howto.txt b/doc/uImage.FIT/howto.txt index 8592719685..f409b3770e 100644 --- a/doc/uImage.FIT/howto.txt +++ b/doc/uImage.FIT/howto.txt @@ -66,6 +66,19 @@ can point to a script which generates this image source file during the build process. It gets passed a list of device tree files (taken from the CONFIG_OF_LIST symbol). +Signing u-boot.itb with SPL_FIT_GENERATOR +----------------------------------------- + +u-boot.itb can be signed to verify the integrity of its components. +When CONFIG_SPL_FIT_SIGNATURE is enabled the CONFIG_SPL_FIT_SIGNATURE_KEY_DIR +option can be used to specifiy the key directory - either a relative or +absolute path. + +See signature.txt for general signature handling, but when +CONFIG_SPL_FIT_GENERATOR is used the option CONFIG_SPL_FIT_GENERATOR_KEY_HINT +can be used to specify the key-hint that should be included into the +created u-boot.its by the generator. + Example 1 -- old-style (non-FDT) kernel booting -----------------------------------------------