This branch introduces the corebootPkg. It allows to easily build a tianocore image that is suitable as coreboot payload.
First you need to set up your EDK2 environment. You can either try your host gcc for which edk2 provides toolchain configurations GCC44 through GCC47 (the latter seems to work with gcc 4.8, too), or you build a mingw compiler, for which Tianocore provides a tool (BaseTools/gcc/mingw-gcc-build.py).
After entering the environment (". edksetup.sh"), build corebootPkg using one of
build -t YOURTOOLCHAIN -a IA32 -p corebootPkg/corebootPkg.dsc
build -t YOURTOOLCHAIN -a X64 -p corebootPkg/corebootPkg.dsc
This ideally creates Build/corebootPkg/DEBUG_YOURTOOLCHAIN/FV/COREBOOT.fd, the payload image.
Configure coreboot to use a Tianocore payload and point it to the COREBOOT.fd created before.
Build, run, have fun. If (no, when) you find bugs, I'd love to see your patches that fix them :-)
It's possible to run corebootPkg with SeaBIOS as CSM. David Woodhouse did the necessary work at http://git.infradead.org/users/dwmw2/edk2.git which I integrated (Thanks David!).
- Fetch SeaBIOS master (eg. git clone http://review.coreboot.org/seabios.git).
- Apply http://git.infradead.org/users/dwmw2/seabios.git/commitdiff/ef6babf96de2b2a15318ee113aee38f5e882e50a to SeaBIOS
- Build SeaBIOS as CSM (General Features - Build Target - Build as Compatibility Support Module ...)
- Copy $SEABIOS/out/bios.bin to $TIANO/corebootPkg/Csm/Csm16/Csm16.bin
- Add -D CSM_ENABLE=TRUE to the tiano build line above
From here, proceed as usual (add COREBOOT.fd as payload).
Please note that the vgabios-cirrus.bin shipped with QEmu/KVM isn't exactly in the format CSM expects. See https://lists.gnu.org/archive/html/qemu-devel/2013-01/msg03650.html
Using SeaBIOS' vgabios implementation for QEmu from latest master should work.
corebootPkg is a collaborative work. First, it's standing on the shoulders of giants, namely the Tianocore project, from which it was branched from. Hopefully we'll eventually get far enough to merge the coreboot support there.
It was started as kind of a dare, which at times seems to be the main driver of coreboot innovation. "Thanks" Stefan Reinauer ;-)
He also contributed a bunch of interoperability patches, most importantly memory table support.
David Woodhouse did the CSM port and provided some guidance when it came to integration.
Scott Duplichan is (to my knowledge) the first one to seriously try to get it running on real hardware. Some of the emulator-specific bits that corebootPkg inherited from OVMF are gone thanks to his code slaying prowess.
Vladimir 'phcoder' Serbinenko added corebootPkg support to GRUB2's coreboot loader, so it can chainload into UEFI.
-- Patrick Georgi