Re: [coreboot] [PATCH] AMD MMCONF Support

[Arne Georg Gleditsch]

Myles Watson  writes:
> RES_PCI_IO, PCI_ADDR(0, 1, 0, 0x78), 0xC0FFFFFF, 0x19000000,
> /* The following operation hangs when performed via MMCFG:
>     pci_read_config32(romcc): 00010000:0078: 20040000
>     setup_resource_map_x_offset: 10000, 78: 20040000
>     pci_write_config32(romcc): 00010000:0078: 19040000
>     (hang)
>   Response missing? */
> /* RES_PCI_IO, PCI_ADDR(0, 1, 0, 0x78), 0xC0FFFFFF, 0x19000000, */
>
> I forgot to ask if you'd tried setting the SyncOnWdError bit (20) in
> function 3, register 0x44.  That could help further debug this
> problem.  For me it caused a reboot instead of a hang when there was a
> response missing.  Bit 21 could also be helpful.

I can have a look.  I won't get a chance until Monday, though.
> Since we don't have the chipset documentation, it makes me a little
> worried to leave out one of the settings.  Maybe we could use non
> MMCONF writes for that setting.

We could fall back to that, if we want to keep it.  FWIW, Ed Swierk had
some input on the semantics of this register the last time this came up:
http://thread.gmane.org/gmane.linux.bios/57708/focus=59900