cproudlock adc8d50e66 pxe: arch-aware NBP + undionly.kpxe for legacy BIOS clients ...

Legacy-BIOS PXE clients booting Blancco reported "NBP is too big to
fit in free base memory". Cause: dnsmasq unconditionally served
ipxe.efi (~675KB EFI binary) which legacy BIOS PXE ROMs cannot
execute and which exceeds their NBP cap.

Fix:
- Add undionly.kpxe (~70KB BIOS-mode iPXE, from boot.ipxe.org).
- dnsmasq: dhcp-match on option:client-arch,0 (BIOS) -> undionly.kpxe;
  default (everything else, including UEFI x86_64 arch 7 and 9) keeps
  getting ipxe.efi. Tag form is reversible: if the match fails to
  evaluate, fallback is the working EFI path, not the new binary.
- Ansible TFTP-copy loop: mirror undionly.kpxe alongside ipxe.efi.
- .gitignore exception: track the open-source kpxe binary so the
  air-gapped USB build stays self-contained.

UEFI clients unchanged. Blancco/Clonezilla/WinPE chain after the
iPXE menu is identical regardless of which iPXE variant delivered it.

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

2026-05-12 15:13:44 -04:00

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