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On some systems (observed on an AWS m8g.medium instance in eu-west-2), the UEFI firmware omits the PCI host bridge drivers for all but the first PCI bus. The observable result is that any devices on other PCI buses (such as the ENA network device) are not enumerated by the UEFI firmware and are therefore unusable by iPXE. Support these systems by switching to using PCIAPI_CLOUD for EFI cloud builds, trying the EFI PCI I/O API first and falling back to direct access (via ECAM) for devices that the UEFI firmware has failed to enumerate itself. Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE README File Quick start guide: cd src make For any more detailed instructions, see http://ipxe.org