[SeaBIOS] MP Table corruption

Kevin O'Connor kevin at koconnor.net
Wed Oct 9 03:26:25 CEST 2013

On Tue, Oct 08, 2013 at 05:27:34PM -0500, Dave Frodin wrote:
> We have a customer that runs a RTOS that uses the MP Tables (rather
> than ACPI).  They are having an issue with the RTOS not being able
> to determine certain system interrupt settings from the MP
> tables. The sent me a MPDiag utility (this may be their own MPDiag
> utility, I believe I've seen others) that exposes the problem. Using
> it I was able to determine that the mptable that coreboot generates
> is getting corrupted somehow by seabios. When I bisected seabios I
> found that there are several commits that cause the mptable
> corruption. The first two problem commits are ...
> 5DBF1732 
> ECA5A947 

This is on coreboot, right?  I don't see a commit ECA5A947 in seabios,
and I don't see how 5DBF1732 could impact mptable.  I guess it's
possible that 5DBF1732 could impact the interrupts as we no longer run
a sipi on all the processors, but I don't think SeaBIOS should have to
issue a sipi - if that is doing something that impacts the OS then
coreboot should do it as part of initializing the processors.


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