[coreboot] Trying to port abit A-S78H

Prakash Punnoor prakash at punnoor.de
Sun Jan 29 16:47:38 CET 2012

On Friday 27 January 2012 12:08:01 Prakash Punnoor wrote:
> On Tuesday 24 January 2012 22:26:31 Scott Duplichan wrote:
> > Prakash Punnoor wrote:
> > ] At least the following "die(...)" statement (romstage.c
> > ]cache_as_ram_main) suggests that program flow should NOT get there. So,
> > if
> > ]coreboots runs again from start, why doesn't it enable port 80 again like
> > ]it did initially?
> > 
> > I am not sure. But the important function is sb7xx_51xx_pci_port80(),
> > called from line 90 of romstage.c. It looks like that function does
> > everything needed to enable PCI port 80. You could try calling the
> > function unconditionally and see what happens.
> Unfortunately that didn't help. So maybe coreboot isn't reaching
> cache_as_ram_main after soft_reset anymore. I commented out the call to
> soft_reset (and die) and now coreboot runs till the device init as on "warm
> start". Any other ideas how to make soft_reset work?

Yay, I think I solved this problem. Some amd functions are depending on the 
cpu type, which are read out at a different place:

diff --git a/src/northbridge/amd/amdfam10/raminit_amdmct.c 
index 0c01cf1..0d7e91e 100644
--- a/src/northbridge/amd/amdfam10/raminit_amdmct.c
+++ b/src/northbridge/amd/amdfam10/raminit_amdmct.c
@@ -197,6 +197,7 @@ u32 mctGetLogicalCPUID(u32 Node)
                ret = AMD_RB_C2;
        case 0x10043:
+       case 0x10053:
                ret = AMD_RB_C3;
        case 0x10062:

According to my research the RB C3 ist closest to my BL C3 and with this patch 
soft_reset seems to work now. The other problems still remains, ie

- seabios payload: no gfx output, but postcode is F8
- grub2 payload, coreboot initialized option ROM: infinte reset loop (but now 
"warm start" and cold start behaviour is identical).

I might try putting in a delay for the post code function, so I can wrtie down 
the last post code in the reset loop...



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