PIRQ problem (Please try using pci=biosirq)

[Eric W. Biederman]

"Deepak Kotian" <dkotian3 at vsnl.net> writes:

> I do not have acces to my system now, so cannot tell for sure but what
> it the signifigance  of this paramater CONFIG_COMPRESS = 0 or 1
> I have seen this in couple of other responses as well which talks about this
> one.
> 
> Can on please elaborate on this please and how this paramerter would lead
> to this error.

LinuxBIOS is naturally split into 2 components.  
The part that runs after ram is believed to be working.
And the part that is used to initialize ram.

During ram initialization the code must run out of
the ROM chip.  After that however the code can live
in RAM.  And we take advantage of that fact by compressing
that code in the ROM chip.

Currently the PIRQ tables are just copied from the LinuxBIOS
image in the ROM chip into RAM.  Around 0xf0000 - 0xfffff.
If ``shadow'' ram has not been enabled there the copy fails.

However if LinuxBIOS is not compressed in the ROM chip, the
uncompressed table can still be found in the last 64K before 1M.
And so the pirq table can still be found that way.

The real fix is to enable shadow RAM.  Disabling compression
is an effective short term work around.

Eric