Possible ACPI relared panic with Tyan S2720

[Nate Lawson]

Peter Holm wrote:
> I have a panic that comes and go. Kostik has helped me narrow the
> problem down to AcpiOsWritePort().
> 
> It is not a problem for me, as there are various was to work around
> it.
> 
> More info can be found here: http://people.freebsd.org/~pho/acpi.html

Thanks for all your debugging effort.

This is a really confusing issue.  All the trace you have shows is that
it occurs while transitioning the system from legacy to ACPI mode.
Unfortunately, the details of what is going on are hidden in the BIOS
since that write to a port triggers an SMI and the BIOS does the rest.

However, it seems like the BIOS is reserving more memory, using memory
it didn't reserve, or FreeBSD is using memory we shouldn't.  John, any
insight on the SMAP output?

> SMAP type=01 base=0000000000000000 len=000000000009fc00
> SMAP type=02 base=000000000009fc00 len=0000000000000400
> SMAP type=02 base=00000000000e0000 len=0000000000020000
> SMAP type=01 base=0000000000100000 len=000000003fef0000
> SMAP type=03 base=000000003fff0000 len=000000000000f000
> SMAP type=04 base=000000003ffff000 len=0000000000001000
> SMAP type=02 base=00000000fec00000 len=0000000000100000
> SMAP type=02 base=00000000fee00000 len=0000000000001000
> SMAP type=02 base=00000000fff80000 len=0000000000080000

Peter, can you figure out what phys address is getting overwritten?
Seems like it's the loader that sets up the module list and the loader's
allocator may be using RAM it shouldn't.

-- 
Nate