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C61 wic image is based on meta-seco-imx, actual image needs changes

    • Closed Issue created by Zygmunt Krynicki @zyga

    The module affected

    Oniro

    What is the action to reproduce the bug?

    Build C61 image and look at the partition table.

    What is the result you see?

    C61 fell through the cracks, most likely because we didn't look at what we built and tried to make sure it is sensible. The resulting image is quite different from other images and is thus difficult to support for updates.

    • The system uses two boot partitions, ESP with GRUB as an EFI app (and custom grub config) and U-boot FAT partition with a kernel image (possibly unused) and some device tree files.
    • U-boot is stashed somewhere in raw space outside of the GPT partition space (this is my best guess, I don't really know what wic and uuu did)
    • It's unclear where u-boot environment is, presumably in the same raw space.
    • U-boot boots GRUB as an EFI app from another partition
    • U-boot hard-codes some partition numbers in a C61 specific patch (grep for efi_partition= in meta-seco-imx).
    • GRUB environment file is missing
    • GRUB configuration from oniro/wic is not used.
    • GRUB configuration file needs to know the partition numbers that contain A/B slots, this needs to work across MACHINES, and avoid per-MACHINE config files.
    • Kernel image inside rootfs/squashfs needs to be at a specific location that GRUB config knows about, differences in Image vs bzImage break this.

    What is the result you expect?

    • C61 should follow the partition scheme we've defined for Jasmine and Goofy.
    • If U-boot is present it should not require a separate partition but instead co-inhabit ESP in a well-defined place (which exact place is unclear).
    • GRUB should load the kernel, from a known fixed file name, inside the squashfs file system in either A or B slots, depending on GRUB environment.
    • GRUB configuration file should be the same across all boards
    • Ideally GRUB configuration would be hard-coded into GRUB binary, making updates easier.
    • Ideally, when using eMMC, U-Boot would live in boot0 and boot1 partitions, so that we could update it atomically.

    Frequency?

    Always

    Tested version

    Current head as of this writing

    Do you know any workaround of this issue?

    The issue is a bit complex and I don't have all the elements. I would suggest that interested parties meet and discuss how to make progress.

    Do you have a fix for this issue?

    No

    Edited
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