Solved it! After quite a lot of messing around... It turns out i was booting with the acpi=off option, but for the BIOS to see the 4 processors acpi has to be on. The problem was that with acpi=on, boot hangs, unless pci=nommconf is added to the boot options. To summarize, I now boot using the options acpi = on pci=nommconf Thanks. Julian. On Tue, May 27, 2008 at 6:29 PM, MHR <mhullrich at gmail.com> wrote: > On Tue, May 27, 2008 at 1:41 PM, John R Pierce <pierce at hogranch.com> > wrote: > > Julian Echave wrote: > >> > >> Sure, find below, I add other stuff as well. Note that there is some bug > >> in the Bios. This does not prevent Centos to boot, and, since Windows > sees > >> all four processors, I reckon it shouldn't be the problem...? > > > > > > yeah, looks like its probably broken ACPI data in the BIOS. see if the > > mainboard or system vendor has a BIOS update to fix this. just because > > operating system "X" works, doesn't mean its 'right'. > > > > You can try adding 'noacpi' to your boot string in your grub.conf file > and see if that helps. > > I have an AMD Athlon 64 x2 on an ECS mobo that is known to have a > problem with acpi. If I try to run without the noacpi switch, it runs > very poorly and crashes or halts within minutes of booting, if it > boots at all. With the flag, it runs smooth as silk. > > mhr > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20080528/7eac0217/attachment-0004.html>