[Bug 2054092] Re: [SRU] Add support for FIT images to rpi config

[Dave Jones]

That indeed only applied to the abandoned Core 24 case, so no issues
there.

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Title:
  [SRU] Add support for FIT images to rpi config

Status in u-boot package in Ubuntu:
  Fix Released
Status in u-boot source package in Noble:
  Fix Committed

Bug description:
  [ Impact ]

  The current u-boot-rpi package does not include support for FIT
  images. Enabling this feature has been requested by an internal team.

  [ Test Plan ]

  To test FIT image generation:

  * Flash the Ubuntu Server for Raspberry Pi 24.04.1 image [1] to an SD card
  * Boot Ubuntu Server and login
  * cp /boot/firmware/vmlinuz .
  * cp /boot/firmware/initrd.img .
  * cat << EOF > image.its
  /dts-v1/;
  / {
      description = "FIT payload";
      #address-cells = <2>;
      images {
          kernel {
              description = "kernel";
              data = /incbin/("vmlinuz");
              type = "kernel";
              arch = "arm64";
              os = "linux";
              compression = "gzip";
              load =  <0x200000>;
              entry = <0x200000>;
              hash {
                  algo = "sha1";
              };
          };
          initrd {
              description = "initramfs";
              data = /incbin/("initrd.img");
              type = "ramdisk";
              arch = "arm64";
              os = "linux";
              compression = "none";
              hash {
                  algo = "sha1";
              };
          };
      };
      configurations {
          default = "standard";
          standard {
              description = "config";
              kernel = "kernel";
              ramdisk = "initrd";
              hash {
                  algo = "sha1";
              };
          };
      };
  };
  EOF
  * Run mkimage -f image.its -T flat_dt image.fit
  * Observe failure with current version
  * Upgrade u-boot-rpi to version in -proposed
  * Run mkimage -f image.its -T flat_dt image.fit
  * Observe successful generation of image in image.fit

  To test no regression in boot operation (carrying on from previous
  instructions):

  * Modify the boot sequence to include u-boot. In config.txt:
    - Set kernel=uboot_rpi_4.bin (adjust as appropriate for test board)
    - Set device_tree_address=0x03000000
    - Comment out initramfs line
  * sudo cp image.fit /boot/firmware/
  * sudo reboot
  * Interrupt u-boot
  * setexpr loadaddr $fdt_addr + 0x100000
  * load mmc 0:1 $loadaddr image.fit
  * bootm :kernel :initrd $fdt_addr
  * Ensure boot succeeds

  [1]:
  http://cdimage.ubuntu.com/releases/24.04.1/release/ubuntu-24.04.1-preinstalled-
  desktop-arm64+raspi.img.xz

  [ Regression Potential ]

  Varied; the u-boot package hasn't been used in the classic images
  since focal (and jammy upgrades includes a quirk to remove it from the
  boot chain), so the impact on the server and desktop images should be
  nil even if it failed entirely. However, the Core images still use
  u-boot so its operation should be checked on all boards supported by
  Core 24 (specifically the Pi 3, 4, and 5 series) by following the
  second part of the test plan above.

  [ Original Description ]

  Support for signed FIT images has been requested; the following config
  items should be enabled for the rpi 3 and 4 configurations (in both
  armhf and arm64):

  CONFIG_FIT=y
  CONFIG_FIT_SIGNATURE=y
  CONFIG_FIT_VERBOSE=y
  CONFIG_FIT_PRINT=y
  CONFIG_TOOLS_FIT=y
  CONFIG_TOOLS_FIT_SIGNATURE=y
  CONFIG_TOOLS_FIT_VERBOSE=y
  CONFIG_TOOLS_FIT_PRINT=y
  CONFIG_ZSTD=y

  Check this doesn't affect core 24 images (there will inevitably be a
  size increase as a result of enabling more flags; this is probably a
  good time to unseed u-boot on the pi images for oracular).

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