[FYI] linux 2.6 still not working with PReP (ppc32)

[Sebastian Heutling]

On Fri, 2004-12-31 at 23:28 +0100, Sven Luther wrote:
> On Fri, Dec 31, 2004 at 04:00:49PM +0100, Sebastian Heutling wrote:
> > On Fri, 2004-12-31 at 10:55 +0100, Sven Luther wrote:
> > > On Mon, Dec 27, 2004 at 03:47:05AM +0100, Christian wrote:
> > > > Marc Dietrich schrieb:
> > > > >Hi all,
> > > > >
> > > > >I read this thread about booting a PowerStack with newer kernels. 
> > > > >Motivated by this, I tried to compile a 2.6.10 kernel on my machine (with 
> > > > >sym53c825a onboard). Sadly, the scsi controller always timeouts during 
> > > > >initialisation. I 
> > > 
> > > I also have some strange issues with network support using the standard debian
> > > 2.6.8 kernel. ifconfig upping the decchip ethernet on the powerstack freezes
> > > the kernel, and i hear reports of problems on IBM PReP hardware too with not
> > > working ethernet, altough there is no freeze.
> > > 
> > > Any idea on this ? 
> > 
> > Does it contain the IRQ patch? Where does it boot from SCSI or net? What
> > PCI-Devices are installed?
> 
> Probably not, just the standard debian kernel, i donÃ't remember any irq
> patches, but there where a bunch of patches from leighbb. it is done

The patch is the one that is included in 2.6.10 which is mentioned above
and this thread already has somewhere in the beginning. I attached it
below.
I haven't had the time yet to test the 2.6.10 kernel. Maybe there is
another problem now ...


> netbooting, and the only pci device installed is the cirruss logic graphic
> card.

If you use the standard debian kernel - ok, it doesn't work because of
wrong IRQs on the PowerstackII (Utah).


BTW: The onboard Winbond IDE chip works as well although no connector is
provided. You only need a little bit of soldering and adjusting the IRQ
of Slot 1 from 0 to 4. :-)


Sebastian Heutling

-- 
diff -puN
arch/ppc/platforms/prep_pci.c~ppc32-fix-motorola-prep-powerstackii-utah-pci-irq-map arch/ppc/platforms/prep_pci.c
---
25/arch/ppc/platforms/prep_pci.c~ppc32-fix-motorola-prep-powerstackii-utah-pci-irq-map      2004-12-07 01:01:16.000000000 -0800
+++ 25-akpm/arch/ppc/platforms/prep_pci.c       2004-12-07
01:01:16.000000000 -0800
@@ -49,10 +49,10 @@ static char Utah_pci_IRQ_map[23] __prepd
         0,   /* Slot 1  - unused */
         5,   /* Slot 2  - SCSI - NCR825A  */
         0,   /* Slot 3  - unused */
-        1,   /* Slot 4  - Ethernet - DEC2114x */
+        3,   /* Slot 4  - Ethernet - DEC2114x */
         0,   /* Slot 5  - unused */
-        3,   /* Slot 6  - PCI Card slot #1 */
-        4,   /* Slot 7  - PCI Card slot #2 */
+        2,   /* Slot 6  - PCI Card slot #1 */
+        3,   /* Slot 7  - PCI Card slot #2 */
         5,   /* Slot 8  - PCI Card slot #3 */
         5,   /* Slot 9  - PCI Bridge */
              /* added here in case we ever support PCI bridges */