[coreboot] PCI MMCONF on amdfam10

ron minnich rminnich at gmail.com
Fri Dec 13 02:46:42 CET 2013

Which is why I always worry about global changes of this sort when
they can't be tested.

Things like this that *should* work, and look very reasonable, can at
times get nasty.


On Thu, Dec 12, 2013 at 3:34 PM, Stefan Reinauer
<stefan.reinauer at coreboot.org> wrote:
> * Kyösti Mälkki <kyosti.malkki at gmail.com> [131212 16:02]:
>> Hi
>> After commit 872c922 there is some trouble on PCI configuration
>> access with Asus M4A785-M. This could apply to other amdfam10 too,
>> although I have not yet received such reports.
>> As the commit message stated, I had discovered that in the beginning
>> of ramstage all PCI configuration access used the IO (0xcf8) method
>> even though Kconfig specified MMCONF_SUPPORT_DEFAULT which should
>> imply all PCI config access is done with MMCONF unless IO is
>> explicitly requested.
> Not sure if this is relevant, but on i945 not all PCI devices are
> visible in MMCONF space. So enabling MMCONF_SUPPORT_DEFAULT there will
> break the system.
> Stefan
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