Re: qemu/powernv: coreboot support?

From: "Marty E. Plummer" <hanetzer@startmail.com>
To: "Cédric Le Goater" <clg@kaod.org>
Cc: Joel Stanley <joel@jms.id.au>,
	qemu-ppc@nongnu.org, qemu-devel@nongnu.org,
	David Gibson <david@gibson.dropbear.id.au>
Subject: Re: qemu/powernv: coreboot support?
Date: Sat, 19 Oct 2019 11:09:34 -0500	[thread overview]
Message-ID: <20191019160933.fizoc6tpu5jday4o@proprietary-killer> (raw)
In-Reply-To: <1cbd1882-15c8-5471-cd65-1c84c2920ba8@kaod.org>

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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. 

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