Re: PCI & IRQ problems on TI Extensa 600CD

[Jim Nelson]

David Jez wrote:
>   Hi Jim,
>
>
> > Need to compile a new kernel for this thing w/o tridentfb - doesn't work 
> > right on my system for some reason.
> >
> > <dmesg - haven't compiled a 2.6.9 for it yet>
> >
> > PCI: PCI BIOS revision 2.10 entry at 0xfd930, last bus=6
> > PCI: Using configuration type 1
> > Linux Kernel Card Services
> >  options:  [pci] [cardbus] [pm]
> > PCI: Probing PCI hardware
> > PCI: Probing PCI hardware (bus 00)
>
>   IRQ router is missing.
>
>
> > PCI: No IRQ known for interrupt pin A of device 0000:00:02.0. Please try 
> > using pci=biosirq.
> > PCI: No IRQ known for interrupt pin B of device 0000:00:02.1. Please try 
> > using pci=biosirq.
> >
> > 00:00.0 Class 0600: 8086:1235 (rev 02)
> > 00:01.0 Class 0601: 8086:122e (rev 02)
> > 00:02.0 Class 0607: 104c:ac12 (rev 04)
> > 00:02.1 Class 0607: 104c:ac12 (rev 04)
> > 00:03.0 Class 0300: 1023:9660 (rev d3)
> > 00:05.0 Class 0400: 1014:0057
> >
> > No PCI interrupt routing table was found.
> >
> > Interrupt router at 00:01.0: Intel 82371FB PIIX PCI-to-ISA bridge
> >  PIRQ1 (link 0x60): irq 11
> >  PIRQ2 (link 0x61): irq 11
> >  PIRQ3 (link 0x62): unrouted
> >  PIRQ4 (link 0x63): unrouted
> >  Serial IRQ: [disabled] [quiet] [frame=17] [pulse=4]
> >  Level mask: 0x0800 [11]
>
>   It looks that you have same problem and kernel doesn't find IRQ
> router. So try attached patch (for 2.6.9 and added your bridge) if it helps.
> I think that it may help (look at dump_pirq results).
>   You can try turn on DEBUG (in file arch/i386/pci/pci.h) and see debug
> messages on screen.
>
>   Dave

That patch comes too late in the PCI init sequence for my machine. 
pirq_find_router() (where your patch goes) depends on pirq_table being set up by 
pirq_find_routing_table().  When I put in the debug statement in the attached 
patch, I got the "PCI: No Interrupt Routing Table found" message.  Since 
pirq_table wasn't set up, pirq_find_router() is never called.  Let me look at this 
some more (got vacation this week, so I can finally devote some time to this.)

Jim
--- linux-2.6.9/arch/i386/pci/irq.c~~	2004-11-02 07:13:15.562669774 -0500
+++ linux-2.6.9/arch/i386/pci/irq.c	2004-11-02 09:01:05.911581344 -0500
@@ -80,6 +80,7 @@
 			return rt;
 		}
 	}
+	DBG("PCI: No Interrupt Routing Table found\n");
 	return NULL;
 }