Qemu: SMBus controller not found (Re: Looking for Sun W1100z/2100z coreboot support)

[Dan Connelly]

Yes, I do have a lot of reading to do (per Peter's comment).   But I am bashing ahead, none the less.

I cloned the Tyan s2885 mainboard as Sunw k85ae.   (Both AMD k8 with same North/South.)

The superio on the k85ae is different from the s2885.  I hacked out the Winbond w83627hf and hacked in the NSC pc87360 stolen from the HP e_vectra_p2706t.

Probably I have not supplied correct PCI address for the NSC chip on my k85ae. (But how would qemu know this?)

Difference between pc87363 and the pc87360 probably not significant (MIDI, game ports, wake-up and Protection?).

Set maximal debugging for coreboot and build the coreboot.rom (with a few adjustments for gcc-4.6.3).

Out of laziness, I have not supplied hda image (yet).

superiotool:  Found NSC PC87363 (sid=0xe8, srid=0x10) at 0x2e

qemu-system-x86_64 -bios build/coreboot.rom -nographic

coreboot-4.0-2490-gf03dff7-dirty Mon Jul  9 15:32:46 EDT 2012 starting...
Enabling routing table for node 00 done.
Enabling UP settings
coherent_ht_finalize
done
SBLink=03
ht reset -
SMBUS controller not found

Hangs there.   Not sure how to proceed from here.   Do the reading, I presume.

-- Dan Connelly

Message: 4
Date: Tue, 3 Jul 2012 01:35:13 +0200
From: Peter Stuge
To:[e-mail]
Subject: Re: [coreboot] Looking for Sun W1100z/2100z coreboot support
Message-ID:
Content-Type: text/plain; charset=us-ascii

Dan Connelly wrote:
> I have decided to put coreboot and linux loader into the existing
> ROM (with reasonable effort).
> Or, perhaps onto a spare chip for the ROM socket.

Yes, using spare chip is the good way.

Depending on your definition of reasonable the project can succeed.

If you have zero experience with PC firmware you have a lot of
reading to do.

You have three mainboards to look at which are all for k8 with 8151.

$ grep 8151 src/mainboard/*/*/Kconfig
src/mainboard/amd/serengeti_cheetah/Kconfig:    select SOUTHBRIDGE_AMD_AMD8151
src/mainboard/tyan/s2875/Kconfig:       select SOUTHBRIDGE_AMD_AMD8151
src/mainboard/tyan/s2885/Kconfig:       select SOUTHBRIDGE_AMD_AMD8151
$
> my guess is that a coreboot configuration should be fairly
> straight-forward (I for a coreboot insider).

Basicaly noone but yourself has an interest in this system, so you
are on your own for doing the work. But when you ask questions along
the way you can get some very good answers from the mailing list.

//Peter

Qemu: SMBus controller not found (Re: Looking for Sun W1100z/2100z coreboot support)

[Peter Stuge]

Dan Connelly wrote:
> Set maximal debugging for coreboot and build the coreboot.rom (with a
> few adjustments for gcc-4.6.3).

Sounds good so far.
> qemu-system-x86_64 -bios build/coreboot.rom -nographic

Sorry, no. You can't test coreboot built for one machine (your sunw)
on another machine (qemu). It will never work.

You can use qemu to learn about coreboot, if you build coreboot for
qemu. But you can not use qemu as a replacement for your actual
hardware unless you first implement full emulation of that hardware
in qemu. Not the way to go.

Related would be serialice. You could then use qemu to run coreboot
on your PC while letting it communicate with the serialice monitor
which runs on your real hardware.

Anyway, if you want to bash further ahead then now is when you must
investigate how to run coreboot on the real hardware, and how you
will deal with the many times that coreboot will not work at all.

Swapping flash chips is the simplest way. If you have more budget you
can buy increasingly fancy tools to make the whole task easier.

//Peter