Add a Kconfig to enable building iPXE for EFI target, which can be
executed from EDK2. If not selected, iPXE will be built for use with
legacy BIOS. Add support to the Makefile to build the EFI target.
Change-Id: I7f247a59a65aeb18a67475d4d543f519af88aeb9
Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83385
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>