Adolfo Delorenzo 80aca5e372 feat: ARM64 generic UEFI disk image (GPT + GRUB A/B) ...

Produces a UEFI-bootable raw disk image for generic ARM64 hosts (QEMU virt,
Ampere/Graviton cloud, ARM64 SBCs with UEFI). Reuses the existing 4-partition
A/B layout from x86 (EFI 256 MB FAT32 + System A 512 MB ext4 + System B 512 MB
ext4 + Data ext4 remainder).

Changes:
- build/scripts/create-disk-image.sh: TARGET_ARCH env var (amd64 default,
  arm64). Selects kernel source path, grub-mkimage target (x86_64-efi vs
  arm64-efi), EFI binary name (bootx64.efi vs BOOTAA64.EFI), grub.cfg variant,
  and whether to also install BIOS GRUB (x86 only).
- build/grub/grub-arm64.cfg: ARM64 variant of grub.cfg. Identical A/B logic;
  console=ttyAMA0+ttyS0 to cover QEMU virt PL011, Ampere PL011, and Graviton
  16550-compat.
- build/Dockerfile.builder: add grub-efi-amd64-bin, grub-efi-arm64-bin,
  grub-pc-bin, grub-common, grub2-common so the builder container can produce
  EFI images for both architectures.
- hack/dev-vm-arm64.sh: split into kernel mode (direct -kernel/-initrd, fast
  iteration) and --disk mode (UEFI firmware + GRUB + disk image, full
  integration test). Probes common UEFI firmware paths on Ubuntu/Fedora/macOS.
  Default kernel path now points at kernel-arm64-generic/Image with fallback
  to the renamed custom-kernel-rpi/Image.
- test/qemu/test-boot-arm64-disk.sh: new CI test for the full UEFI -> GRUB ->
  kernel -> stage-90 boot chain. Uses a scratch copy of the disk so grubenv
  writes don't mutate the source artifact.
- Makefile: new disk-image-arm64 target (depends on rootfs-arm64 + kernel-arm64),
  new test-boot-arm64-disk target, .PHONY + help updates.

Phase 3 scaffold is in place. First real end-to-end ARM64 build runs in the
next step on the Odroid runner — that's where we find out what's actually
broken.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-14 10:36:08 -06:00

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