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

Browse Source

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>

...

This commit is contained in:

cproudlock

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

parent 3896667c90

commit adc8d50e66

3 changed files with 17 additions and 4 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download Patch File Download Diff File Expand all files Collapse all files

BIN

boot-files/undionly.kpxe Normal file

Binary file not shown.