Heinrich Schuchardt <xypron.g...@gmx.de> writes: > Am 13. Juni 2025 16:54:48 MESZ schrieb Javier Martinez Canillas > <javi...@redhat.com>: >>Heinrich Schuchardt <xypron.g...@gmx.de> writes: >> >>Hello Heinrich, >> >>Thanks for your feedback. >> >>> Am 13. Juni 2025 10:57:38 MESZ schrieb Javier Martinez Canillas >>> <javi...@redhat.com>: >>>>The UEFI 2.10 specification mentions that this protocol shall be installed >>>>along with EFI_BLOCK_IO_PROTOCOL. It provides cached partition information >>>>for MBR and GPT partition types. >>> >>> U-Boot is targeting the EBBR specifcation which defines a subset of UEFI. >>> >> >>Interesting. I knew that the u-boot EFI implementation was to support >>SystemReady IR (what is now called SystemReady DeviceTree) and EBBR, >>but I didn't know that meant to only implement what's required by EBBR. >> >>I noticed that EFI_PARTITION_INFO_PROTOCOL is not even required by SBBR >>and only EFI_BLOCK_IO_PROTOCOL is required there just like for EBBR. >> >>> Which application needs this protocol? >> >>We are experimenting with a new A/B boot protocol and an EFI binary that >>implements it. It's inspired on what the Android Boot Loader does for its >>A/B booting too. >> >>The project is https://gitlab.com/CentOS/automotive/src/ukiboot and reads >>UKI (https://uapi-group.org/specifications/specs/unified_kernel_image) >>images from raw data partitions. Just like ABL reads Android Boot images. > > Linaro already implemented A/B EFI Boot in U-Boot. > (https://docs.u-boot.org/en/latest/develop/uefi/fwu_updates.html). What are > you missing in the existing solution? >
Maybe I haven't explained myself clearly but we are talking about different things here. The solution you mention is to support A/B *firmware* updates, while I was talking about A/B *Linux kernel* updates. ukiboot already works on platforms that use an edk2 based EFI firmwares, since these provide the EFI_PARTITION_INFO_PROTOCOL. I just want to make it work on platforms that use u-boot instead. > Best regards > > Heinrich > -- Best regards, Javier Martinez Canillas Core Platforms Red Hat
