Firmware version management is not implemented in the current FMP implementation. This series aims to add the versioning support in FMP.
Currently, there is no way to know the current running firmware version through the EFI interface. FMP->GetImageInfo() returns always 0 for the version number. So a user can not know that expected firmware is running after the capsule update.
EDK II reference implementation utilizes the FMP Payload Header inserted right before the capsule payload. U-Boot also follows the EDK II implementation. With this series applied, version number can be specified in the capsule file generation with mkeficapsule tool, then user can know the running firmware version through FMP->GetImageInfo() and ESRT.
There is a design consideration for lowest supported version. If the backing storage is a file we can't trust any of that information since anyone can tamper with the file, although the variables are defined as RO. With that, we store the lowest supported version in the device tree. We can trust the information from dtb as long as the former stage boot loader verifies the image containing the dtb. The firmware version can not be stored in device tree because not all the capsule files do not have a device tree.
Note that this series does not mandate the FMP Payload Header, compatible with boards that are already using the existing U-Boot FMP implementation. If no FMP Payload Header is found in the capsule file, fw_version, lowest supported version, last attempt version and last attempt status is set to 0 and this is the same behavior as existing FMP implementation.
Major Changes in v6: - change the location of fw_version and lowest supported version - fw_version is stored in FMP Payload Header in the capsule file - lowest_supported_version is stored in the device tree
Major Changes in v5: - major design changes, versioning is implemented with device tree instead of EFI variable
Major Changes in v4: - add python-based test
Major Changes in v3: - exclude CONFIG_FWU_MULT
Masahisa Kojima (8): efi_loader: add the number of image entries in efi_capsule_update_info efi_loader: store firmware version into FmpState variable efi_loader: versioning support in GetImageInfo efi_loader: get lowest supported version from device tree efi_loader: check lowest supported version mkeficapsule: add FMP Payload Header doc: uefi: add firmware versioning documentation doc: uefi: add anti-rollback documentation
arch/arm/mach-rockchip/board.c | 4 +- .../imx8mp_rsb3720a1/imx8mp_rsb3720a1.c | 2 +- .../imx8mm-cl-iot-gate/imx8mm-cl-iot-gate.c | 2 +- board/emulation/qemu-arm/qemu-arm.c | 2 +- board/kontron/pitx_imx8m/pitx_imx8m.c | 2 +- board/kontron/sl-mx8mm/sl-mx8mm.c | 2 +- board/kontron/sl28/sl28.c | 2 +- board/rockchip/evb_rk3399/evb-rk3399.c | 2 +- board/sandbox/sandbox.c | 2 +- board/socionext/developerbox/developerbox.c | 2 +- board/st/stm32mp1/stm32mp1.c | 2 +- board/xilinx/common/board.c | 2 +- doc/develop/uefi/uefi.rst | 61 ++++ .../firmware/firmware-version.txt | 22 ++ doc/mkeficapsule.1 | 10 + include/efi_loader.h | 3 +- lib/efi_loader/efi_firmware.c | 273 ++++++++++++++++-- lib/fwu_updates/fwu.c | 2 +- tools/eficapsule.h | 30 ++ tools/mkeficapsule.c | 37 ++- 20 files changed, 421 insertions(+), 43 deletions(-) create mode 100644 doc/device-tree-bindings/firmware/firmware-version.txt