[coreboot] [PATCH] Istanbul support

Ed Swierk eswierk at aristanetworks.com
Wed Apr 14 06:15:53 CEST 2010

On Tue, Apr 13, 2010 at 12:35 AM, Arne Georg Gleditsch
<arne.gleditsch at numascale.com> wrote:
> That's a valuable data point.  I'm also running with it disabled, no
> apparent problems here either.
> I'd like to push this mmconf patch upstream in some shape or form, so if
> anyone would like to chime in how to approach this I'd be glad.  I could
> just wrap the offending line with "#if !CONFIG_MMCONF_SUPPORT_DEFAULT"
> or something, if that's acceptable.  If we can't figure out what it
> affects, however, perhaps we're just as well off removing it?

It appears that the write to register 0x78 is attempting to switch the
LPC device from subtractive decode to positive decode. Presumably the
hang is due to the LPC device not being configured for some IO or
memory range. Why you're seeing the hang only when mmconfig is
enabled, I have no idea.

I'd vote for removing that line, but I have no means to check whether
that would break any board.


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