TianoCore is an open source implementation of UEFI, the Unified Extensible Firmware Interface. UEFI (formerly EFI) is intended to replace the traditional PC BIOS. TianoCore as in implementation cannot do that, as it lacks the code to do hardware initalization. Since hardware initialization is exactly what coreboot does, the combination of coreboot + TianoCore is the most straightforward option to provide a complete, opensource UEFI environment.
There are various approaches for loading TianoCore, the easiest one seem to be to use SeaBIOS floppy mechanism and DuetPkg.
- Setup edk2 for compilation:
- First compile DuetPkg:
cd BaseTools export EDK_TOOLS_PATH=$(pwd) cd ../ . ./edksetup.sh BaseTools build -p DuetPkg/DuetPkgIa32.dsc
- Then package it in a floppy file:
Go in the edk2 directory, then run the following commands:
cd BaseTools export EDK_TOOLS_PATH=$(pwd) cd ../ . ./edksetup.sh BaseTools ./DuetPkg/PostBuild.sh IA32 GCC44 ./DuetPkg/CreateBootDisk.sh file ./floppy.img ./floppy.img FAT12 IA32 GCC44 lzma -zc floppy.img > myfloppy.img.lzma
- Then add it to cbfs:
Go into the coreboot directory and do:
./build/cbfstool coreboot.rom add -f /path/to/myfloppy.img.lzma -n floppyimg/MyFloppy.lzma -t raw ./build/cbfstool coreboot.rom print
- reflash coreboot and reboot.
- Then while booting press F12 and choose it:
Press F12 for boot menu. Select boot device: 1. Ramdisk [MyFloppy] 2. ata1-0: Hitachi HDP725050GLA360 ATA-8 Hard-Disk (465 GiByte
M4a785T-M => fails with an interrupt issue Qemu => wait or hang (I should use gdb to find out which one) x60 => reboots (maybe it's normal and it reboots becuase it didn't find an uefi boot media?)