Re: [2.6.26.*] boot problem (ahci/irq related?)

[Robert Hancock]

Andi Kleen wrote:
> On Mon, Aug 11, 2008 at 10:27:31PM +0200, Ingo Molnar wrote:
> > * Maciej Rutecki <maciej.rutecki@xxxxxxxxx> wrote:
> >
> > > A have problem with booting 2.6.26* and 2.6.27-rc* kernels. Very often
> > > booting stops on this message:
> > >
> > > [...]
> > > Uniform Multi-Platform E-IDE driver
> > > ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
> > > ICH7: IDE controller (0x8086:0x27df rev 0x01) at  PCI slot 0000:00:1f.1
> > > ACPI: PCI Interrupt 0000:00:1f.1[A] -> GSI 16 (level, low) -> IRQ 16
> > > ICH7: not 100% native mode: will probe irqs later
> > > ICH7: IDE port disabled
> > >     ide0: BM-DMA at 0x60a0-0x60a7
> > >
> > > afer should be:
> > > hda: MATSHITADVD-RAM UJ-840S, ATAPI CD/DVD-ROM drive
> > > hda: host max PIO4 wanted PIO255(auto-tune) selected PIO4
> > > hda: MWDMA2 mode selected
> > > ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> > > [...]
> > >
> > > Initially I was think, that is hardware problem. But XP and 2.6.25.8 
> > > work with _no_ problem (booting from xp, linux, knoppix, linux 
> > > firmware development kit - about 50 reboots).
> > > http://unixy.pl/maciek/download/kernel/dupa/dmesg-2.6.26.2.txt
> > > dmesg: http://unixy.pl/maciek/download/kernel/dupa/dmesg-2.6.25.8.txt
> > i had a look at diff -up dmesg-2.6.25.8.txt dmesg-2.6.26.2.txt, and 
> > these changes stood out:
>
> Yes post 2.6.25 changed to trust the ACPI motherboard resources
> to signify working mmcfg, previously it would use the e820 table
> which excluded near all motherboards which were not white listed
> by PCI-ID because BIOS programmers were generally not aware
> they had to reserve mcfg in e820. 
>
> You can verify this by booting with pci=nommconf. If it works
> then it's likely that.
>
> The new heuristic is apparently the same as what Vista does.
>
> Robert Hancock (cc'ed, fullquote) is mr. mmconfig quirk.
>
> -Andi

Wouldn't hurt to try it, but I'm kind of doubtful it's that - MMCONFIG 
failures don't normally get that far into bootup, and I believe we're 
not using it for non-extended config space anyways - I doubt IDE is 
doing extended config space access..
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