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This class calls systemd ukify tool, which will combine kernel/initrd/stub components to build the UKI. To sign the UKI (i.e. SecureBoot), the keys/cert files can be specified in a configuration file or UEFI binary signing can be done via separate steps, see qemuarm64-secureboot in meta-arm. UKIs are loaded by UEFI firmware on target which can improve security by loading only correctly signed kernel, initrd and kernel command line. Using systemd-measure to pre-calculate TPM PCR values and sign them is not supported since that requires a TPM device on the build host. Thus "ConditionSecurity=measured-uki" default from systemd 256 does not work but "ConditionSecurity=tpm2" in combination with secure boot will. These can be used to boot securely into systemd-boot, kernel, kernel command line and initrd which then securely mounts a read-only dm-verity /usr partition and creates a TPM encrypted read-write / rootfs. Tested via qemuarm64-secureboot in meta-arm with https://lists.yoctoproject.org/g/meta-arm/topic/patch_v3_02_13/108031399 and a few more changes needed, will be posted separately. (From OE-Core rev: da69a73491a72b46e299f874ce90d81135cd9656) Signed-off-by: Michelle Lin <michelle.linto91@gmail.com> Acked-by: Erik Schilling <erik.schilling@linaro.org> Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>