[DistroKit] [PATCH v2 0/4] enable uploading kernel, dtb and initramfs over fastboot and boot it on Rock3A

[Johannes Zink <j.zink@pengutronix.de>]

This series enables building Android sparse images of kernel, dtb and
initramfs for the Radxa Rock3A, enables mounting corresponding ram-files
as fastboot partitions in the barebox fastboot gadget, and adds support
for booting the image uploaded via fastboot.

This can be useful in situations, where booting a Linux system is
required on such target without touching the nonvolatile storage, e.g.
for debugging purposes.

For uploading kernel, dtb and initramfs use

fastboot flash ram-kernel    platform-v8a/images/linuximage -S 1
fastboot flash ram-oftree    platform-v8a/images/rk3568-rock-3a.dtb -S 1
fastboot flash ram-initramfs platform-v8a/images/initramfs-sparse.img -S 1

then for booting either use the barebox command

boot ram-fastboot

or pass the bootcommand over fastboot from the host via

fastboot oem exec boot ram-fastboot

Best regards
Johannes

To: distrokit@pengutronix.de
Cc: patchwork-jzi@pengutronix.de

Signed-off-by: Johannes Zink <j.zink@pengutronix.de>
---
Changes in v2:
- worked in feedback from Ahmad, Jan and Robert (off-list). Thanks for
  your review and feedback!
  - only support zstd compressed initramfs, drop support for gzip (image
    generation and kernel config)
  - drop generation of android-sparse images. Use -S 1 parameter on
    fastboot command instead to avoid cut-off issues
  - export mmc{0,1,2} as optional partitions with generic names now,
    add init script to detect these partitions on boot
  - rename fastboot partitions {kernel,initramfs,oftree} to
    ram-{kernel,initramfs,oftree} to make their non-permanent state more
    obvious
  - change name of fastboot boot script to ram-fastboot for the same
    reason
  - remove unneeded root=/dev/ram from kernel cmdline for the
    ram-fastboot target
  - update commit messages and cover-letter accordingly
- Link to v1: https://lore.distrokit.org/20230606-default_enable_fastboot_rock3a-v1-0-42195d538df2@pengutronix.de

---
Johannes Zink (4):
      v8a: enable initrd generation
      v8a: kernel: enable initramfs in kernel config
      v8a: barebox: enable loading kernel, dtb and initrd via fastboot
      v8a: barebox: add a boot target for fastboot loaded image files

 .../barebox-common-defaultenv/boot/ram-fastboot           |  7 +++++++
 .../barebox-common-defaultenv/init/detect-mmcs            |  3 +++
 .../barebox-common-defaultenv/nv/fastboot.acm             |  1 +
 .../barebox-common-defaultenv/nv/fastboot.bbu             |  1 +
 .../barebox-common-defaultenv/nv/fastboot.partitions      |  1 +
 .../barebox-common-defaultenv/nv/usbgadget.autostart      |  1 +
 configs/platform-v8a/kernelconfig                         | 15 ++++++++++++---
 configs/platform-v8a/platformconfig                       | 12 +++++++++++-
 8 files changed, 37 insertions(+), 4 deletions(-)
---
base-commit: 282b5aff9aecf141de5040f896a9a10081596350
change-id: 20230606-default_enable_fastboot_rock3a-3223c6b01647

Best regards,
-- 
Johannes Zink <j.zink@pengutronix.de>