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.
Ah! Now I understand. I hadn't looked at that branch, so I had no
idea what all this pnor stuff was about. In mainline we just load
skiboot as a normal firmware file and jump into it.
> However, you can bypass all this internal boot process by simply passing
> a -bios option and not passing a MTD device.
Right.
> I haven't published the PNOR support and the boot from PNOR yet. Lack
> of time and because sPAPR is the priority.
>
> > Do you think it would be within your wheelhouse to provide a generic,
> > non-ffs
> > pnor interface for loading arbitary rom images?
>
> I should probably send the PNOR patchset now so that we can discuss on
> a better way to satisfy all needs.
>
> > It would be of great help if
> > you could. (This would still hopefully have the bmc support code as
> > well, as I'm still needing to support a system using one).
>
> We have support for Aspeed machines AST2400, AST2500 and AST2600. It
> is possible to interconnect them through the BT device. Or you can use
> the IPMI BT simulator of QEMU on the PowerNV machine
>
> Thanks,
>
> C.
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
signature.asc
Description: PGP signature
