Re: qemu/powernv: coreboot support?

[Marty E. Plummer]

On Sat, Oct 19, 2019 at 05:53:12PM +0200, Cédric Le Goater wrote:
> On 19/10/2019 17:31, Marty E. Plummer wrote:
> > On Sat, Oct 19, 2019 at 03:46:59PM +0200, Cédric Le Goater wrote:
> >> On 18/10/2019 19:28, Marty E. Plummer wrote:
> >>> Hello,
> >>>
> >>> First off, thank you for the work you've done on the ppc64 support, it
> >>> has been very useful. I'm currently working on a coreboot port for the
> >>> talos ii line of systems (which means more ppc64 support, support
> >>> specifically for the power9 sforza chip, and specific mainboard support.
> >>> My plate is very full lol) and have been using qemu to debug the
> >>> bootblock.
> >>>
> >>> It has been very useful for that, but I'm now at the point where I need
> >>> to jump to romstage, and that's where it gets tricky. qemu parses the rom
> >>> image and looks for a ffs header, locates skiboot on it, and jumps 
> >>> straight
> >>> to that. Not exactly ideal for debugging something not produced from 
> >>> op-build.
> >>
> >> yes. I suppose you are using my branch powernv-4.2 which adds PNOR support
> >> and a way to boot directly from PNOR. In that case, QEMU parses the PNOR
> >> file to extract the PAYLOAD partition (skiboot). skiboot also detects the
> >> flash and extract the kernel and initramfs from the PNOR.
> >>
> >> However, you can bypass all this internal boot process by simply passing
> >> a -bios option and not passing a MTD device.
> >>
> > Doing so gives me the following error:
> > qemu-system-ppc64: Could not load OPAL firmware 'build/coreboot.rom'
> > (this is after I patched the 4mb size limit up)
> 
> Could you make that rom available ? 
> 
Sure, I think. Not sure about how sending files works in my current mail
client but will see. Its more or less a 'stock' (as stock as can be for
a new coreboot target) coreboot.rom file, but I've added some logic into
the build to fake a pnor ffs header at the end in order to trick hostboot
bootloader into loading it.
> Thanks,
> 
> C.

coreboot.rom.gz
Description: Binary data