> > https://ftp.fau.de/centos/7.1.1503/os/x86_64/EFI/BOOT/ > > That grubx64.efi binary makes no attempt to even look for an > EFI_PXE_BASE_CODE_PROTOCOL. Here's the complete log of calls that it makes:
With grubx86.efi loaded via tftp I assume? > OpenProtocol ( > PciRoot(0x0)/Pci(0x3,0x0)/MAC(525400123456,0x1)/grubx64.efi, > LoadedImage, > PciRoot(0x0)/Pci(0x3,0x0)/MAC(525400123456,0x1)/grubx64.efi, <NULL>, G ) > = 0 ( 0x3f1aac00 ) -> 0x3e90349b ... yes, seems so. The very same grub binary boots from network and disk, so I guess here it tries to figure how it was loaded to then go fetch the grub.cfg file from the same location. On a successfull boot (with EFI_DOWNGRADE_UX) I see this in the ovmf log: [ ... lot of stuff snipped ... ] Booting EFI Network InstallProtocolInterface: 245DCA21-FB7B-11D3-8F01-00A0C969723B 6FD60E0 InstallProtocolInterface: 41D94CD2-35B6-455A-8258-D4E51334AADD 7073B20 InstallProtocolInterface: 3AD9DF29-4501-478D-B1F8-7F7FE70E50F3 7074BF8 InstallProtocolInterface: F4B427BB-BA21-4F16-BC4E-43E416AB619C 70798B0 InstallProtocolInterface: 245DCA21-FB7B-11D3-8F01-00A0C969723B 6FD60E0 InstallProtocolInterface: 5B1B31A1-9562-11D2-8E3F-00A0C969723B 70ADB40 Loading driver at 0x00006605000 EntryPoint=0x00006605400 InstallProtocolInterface: BC62157E-3E33-4FEC-9920-2D3B36D750DF 7094898 PixelBlueGreenRedReserved8BitPerColor The guids translate to: 245DCA21-FB7B-11D3-8F01-00A0C969723B gEfiPxeBaseCodeCallbackProtocolGuid 41D94CD2-35B6-455A-8258-D4E51334AADD gEfiIp4ProtocolGuid 3AD9DF29-4501-478D-B1F8-7F7FE70E50F3 gEfiUdp4ProtocolGuid F4B427BB-BA21-4F16-BC4E-43E416AB619C gEfiArpProtocolGuid 245DCA21-FB7B-11D3-8F01-00A0C969723B gEfiPxeBaseCodeCallbackProtocolGuid 5B1B31A1-9562-11D2-8E3F-00A0C969723B gEfiLoadedImageProtocolGuid BC62157E-3E33-4FEC-9920-2D3B36D750DF gEfiLoadedImageDevicePathProtocolGuid Hmm, EfiPxeBaseCode*Callback*Protocol? > Do you have a set of instructions (starting from "git clone > git://git.savannah.gnu.org/grub.git") which will allow me to rebuild > that grubx64.efi binary from the source? The rpm spec file for grub2 is here: https://git.centos.org/blob/rpms! grub2/c695181b7bb165516116ba7c7d94805c799ae977/SPECS!grub2.spec grubx64.efi is created with grub-mkimage: <quote> ./grub-mkimage -O %{grubefiarch} -o %{grubefiname}.orig \ -p /EFI/%{efidir} -d grub-core ${GRUB_MODULES} </quote> cheers, Gerd