Re: Intel DX58S0 (i7) motherboard and pci=nommconf

On Wed, 2009-08-05 at 10:26 -0600, Frank Cox wrote:
I asked about this the other day with no response so I'll bring it up again,
and include some detail that may be useful to others.

This computer is has an Intel i7-940 CPU and a DX58S0 motherboard. I have
updated it to the latest bios that's available from Intel's website.

With the default Fedora 11 installation, it will hang up on a warm boot. When
it boots normally it shows a quick "Intel" splash screen, the Grub, then loads
Fedora 11. If I warm boot it, most of the time it hangs up either right before
or right after the Intel splash screen, with a black screen and a flashing
cursor at the top left-hand side.

Edit your /etc/grub.conf, change:
timeout=0 to timeout=10 and comment out hidemenu.
Next, remove quiet and rhgb.

This should give you more information on what exactly hangs and when.

P.S. Any chance you have a second machine and a serial cable?


If I cold-boot it (turn the machine off for a minute then turn it back on) it
boots up and works fine.

After much experimenting I have discovered that this problem seems to go away
(at least so far) if I put "pci=nommconf" into my grub.conf file.

As far as I remember nommconf forces the kernel to ignore the PCI
configuration tables - which as far as I remember, are being generated
by the BIOS. (Anyone else?)

I find it hard to believe that an Intel board generates broken PCI
configuration tables.

Can you post the complete machine configuration?


Therefore, if anyone else has one of these motherboards, you might want to try
"pci=nommconf" and see if that solves the problem.

I still don't completely understand what it is that I am giving up or changing
by using pci=nommconf. This computer appears to perform just as well with that
line as without it. So what is the advantage of pci=mmconf (the default)
versus pci=nommconf? Or are we just looking at two different routes to the
same destination?

As far as I know, if everything works, it means that the kernel managed
to discover and configure all the PCI devices correctly and as such, I
see no harm in using it.

Either way, given the fact that it doesn't happen during cold boot, it
looks like a hardware issue to me.
I'd consider contacting your MB manufacturer.

- Gilboa

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