Re: [RFC PATCH 0/5] ppc/Pegasos2 VOF

[David Gibson]

On Thu, Jun 10, 2021 at 05:14:45PM +1000, Alexey Kardashevskiy wrote:
> 
> 
> On 6/9/21 20:28, BALATON Zoltan wrote:
> > On Wed, 9 Jun 2021, Alexey Kardashevskiy wrote:
> > > On 6/7/21 01:46, BALATON Zoltan wrote:
> > > > Based-on: <20210520090557.435689-1-aik@ozlabs.ru>
> > > > ^ That is v20 of Alexey's VOF patch
> > > > 
> > > > Hello,
> > > > 
> > > > Posting these for early review now. I plan to rebase on the next VOF
> > > > patch that hopefully fixes those points that I had to circumvent in
> > > > patch 1 for now. I've reported these before but now all of those that
> > > > are needed for pegasos2 are in one place. Other points I've reported
> > > > could be clean ups but not sttictly needed.
> > > > 
> > > > With this series on top of VOF v20 I can now boot Linux and MorphOS on
> > > > pegasos2 without needing a firmware blob so I hope this is enough to
> > > > get this board in 6.1 and also have it enabled so users can start
> > > > using it. That means that VOF will also be merged by then. This now
> > > > gives VOF another use case that may help it getting finished.
> > > > 
> > > > I've also updated my development tree with this series here:
> > > > 
> > > > https://osdn.net/projects/qmiga/scm/git/qemu/tree/pegasos2/
> > > > 
> > > > Please review so I can do any needed changes together with the rebase
> > > > on next VOF patch so we don't miss 6.1 this time.
> > > 
> > > 
> > > It would help if you provided the disk or/and kernel or/and
> > > initramdisk images and the example command line to give this a try.
> > > And said a few words who is this Pegasos2 guy :) The series looks ok
> > > to me otherwise. Thanks,
> > 
> > These were in the original series adding this board:
> > 
> > https://patchew.org/QEMU/cover.1616680239.git.balaton@eik.bme.hu/
> 
> 
> Ah ok. Thanks!
> 
> 
> > For testing I've used the kernel from debian 8.11.0 powerpc iso which is
> > known to work on real hardware and MorphOS demo iso available from
> > www.morphos-team.net. For debian look into install/pegasos to find the
> > right vmlinuz-chrp.initrd kernel, for MorphOS use the boot.img from root
> > of the iso as -kernel.
> > 
> > What's still missing is some rtas functions like get-time-of-day. Are
> > these any kind of standard and is there a doc about their parameters and
> > returns or I'll heave to find out from kernel sources? I plan to add
> > these later but not needed to get it boot.
> 
> pseries guests use what the LoPAPR spec (derived from sPAPR - "server PAPR")
> describes:
> 
> https://openpowerfoundation.org/?resource_lib=linux-on-power-architecture-platform-reference

Of course pegasos won't remotely be PAPR, but you could look at how
the RTAS functions are defined there.

I'm not really sure of the origins of RTAS.  It's not in plain
IEEE1275 (the original OF spec), but the fact pegasos uses it suggests
it's not purely a PAPR thing, either.

-- 
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

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