This series takes a different approach to embedding the public key EFI Signature List(ESL) needed for capsule authentication into the platform's DTB.
The earlier approach [1] was using a u-boot.dtsi file to embed the key. But this approach has a few issues. 1) The path of the incbin file is not relative to $(srctree), but relative to the directory of the dts file which is including the dtsi -- this causes problems when the dts file are located in different directories. 2) The u-boot.dtsi file only gets included in the DTB if there are no other *u-boot.dtsi files being included. 3) A separate u-boot.dtsi is needed per arch.
To get around these issues, this approach generates a dtsi file(.capsule_esl.dtsi) with the public key node during build. This generated dtsi file contains the resolved path to the ESL and is then included for the DTB generation.
The first patch of the series also cleans up the logic to include the dtsi files, by collating all the dtsi files to be included into a single variable.
These patches need to be applied on top of the series for generating the capsules as part of the build [2].
[1] - https://lists.denx.de/pipermail/u-boot/2023-August/526323.html [2] - https://lore.kernel.org/u-boot/20230812153024.334563-1-sughosh.ganu@linaro.o...
Changes since RFC series:
* s/include_files/dtsi_include_list * Remove the default value of the config symbol. * s/include_files/dtsi_include_list * Add all the dtsi files being included as dependency for the dtb target. * s/u-boot/U-Boot in the commit message. * New patch for removing superfluous logic from efi capsule update test setup.
Sughosh Ganu (5): scripts/Makefile.lib: Collate all dtsi files for inclusion scripts/Makefile.lib: Embed capsule public key in platform's dtb sandbox: capsule: Add path to the public key ESL file doc: capsule: Document the new mechanism to embed ESL file into dtb test: capsule: Remove logic to add public key ESL
configs/sandbox_defconfig | 1 + configs/sandbox_flattree_defconfig | 1 + doc/develop/uefi/uefi.rst | 19 ++++--------- lib/efi_loader/Kconfig | 8 ++++++ lib/efi_loader/capsule_esl.dtsi.in | 11 ++++++++ scripts/Makefile.lib | 29 ++++++++++++++++---- test/py/tests/test_efi_capsule/conftest.py | 28 +++++-------------- test/py/tests/test_efi_capsule/signature.dts | 10 ------- 8 files changed, 57 insertions(+), 50 deletions(-) create mode 100644 lib/efi_loader/capsule_esl.dtsi.in delete mode 100644 test/py/tests/test_efi_capsule/signature.dts