Emma Thorpe b3fa34f431 feat(t400): add coreboot GRUB/UEFI boot variants and discrete ATI GPU ...

Split the T400 bootloader into self-contained, importable modules so the host
can match whatever firmware is flashed (switch by changing one import):
- boot-bios.nix       stock BIOS / coreboot+SeaBIOS -> GRUB on the MBR (default)
- boot-coreboot-grub.nix  coreboot GRUB payload -> config-only GRUB (device=nodev)
- boot-coreboot-uefi.nix  coreboot Tianocore/UEFI payload -> systemd-boot; carries
                          its own ESP (/boot vfat) so it travels with the mode

Cover the optional discrete ATI Mobility Radeon HD 3470 (RV620): load the open
`radeon` KMS driver in the initrd for early modesetting (firmware via
enableRedistributableFirmware), with a note on the T400's switchable graphics.

All three boot variants evaluate; nixfmt clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-06-04 15:35:31 +01:00

..

machine

feat(t400): add coreboot GRUB/UEFI boot variants and discrete ATI GPU

2026-06-04 15:35:31 +01:00

modules

refactor(nixos): declare bootloader per-host, not in workstation.nix

2026-06-04 15:22:07 +01:00