Geode GX1 and IRQ tables

[ramesh bios]

Strike that. The issue is somewhere with
copy_pirq_routing_table. IE: why does the copy to
f0000 fail. I had assumed that the 500 address was an
alternate location that the table was copied to. So
now, I'm looking at that f000 failure.

--- ramesh bios <ramesh_bios at yahoo.com> wrote:

> The URL for the Cox/Weinigel thread about PIRQ
> tables
> on the geode gx1 is at:
> http://lkml.org/lkml/2002/7/5/104
> 
> I'm doing a little bit more analysis of the problem
> now. I've been looking at the following block of
> code
> from 2.6.10's pci/irq.c. First of all, LB states
> this
> during bootup:
> ---
> Checking IRQ routing tables...
> /bios/freebios/src/arch/i386/lib/pirq_routing.c:   
> 30:check_pirq_routing_table() - irq_routing_table
> located at: 0x00008740
> done.
> Copying IRQ routing tables to 0xf0000...done.
> Verifing priq routing tables copy at
> 0xf0000...failed
> Wrote linuxbios table at: 00000500 - 00000664 
> checksum f9fe
> ---
> I'm not sure why the copy to 0xf0000 failed. That's
> kinda odd but I'll live with it for now. Now, I put
> some debug in the kernel code to see whether it
> found
> the pirq table and I saw:
> 
> ---
> no pirq_table so calling
> pcibios_get_irq_routing_table
> pirq_table=00000000
> ---
> 
> coming from pcibios_irq_init. So based on the code
> appended below, I believe that the kernel isn't
> finding the pirq table. And I think this is because
> the kernel's pirq_find_routing_table function only
> looks from __va(0xf0000) to __va(0x100000) whereas
> LB
> puts it at 0000500. The second attempt that the
> kernel
> makes to get the PIRQ table is with
> pcibios_get_irq_routing_table and that fails too. I
> need to look at that, but first I think I'll look
> into
> why the copy to f0000 fails. In the meantime, any
> advice?
> 
> ---
> static int __init pcibios_irq_init(void)
> {
>         DBG("PCI: IRQ init\n");
> 
>         if (pcibios_enable_irq || raw_pci_ops ==
> NULL)
>                 return 0;
> 
>         dmi_check_system(pciirq_dmi_table);
> 
>         pirq_table = pirq_find_routing_table();
> 
> #ifdef CONFIG_PCI_BIOS
>         if (!pirq_table && (pci_probe &
> PCI_BIOS_IRQ_SCAN)) {
>                 printk(KERN_WARNING "no pirq_table
> so
> calling pcibios_get\n");
>                 pirq_table =
> pcibios_get_irq_routing_table();
>                 printk(KERN_WARNING
> "pirq_table=%p\n",pirq_table);
>         }
> #endif
>         if (pirq_table) {
>                 printk(KERN_WARNING "had
> pirq_table\n");
>                 pirq_peer_trick();
>                 pirq_find_router(&pirq_router);
>                 if (pirq_table->exclusive_irqs) {
>                         int i;
>                         for (i=0; i<16; i++)
>                                 if
> (!(pirq_table->exclusive_irqs & (1 << i)))
>                                        
> pirq_penalty[i] += 100;
>                 }
>                 /* If we're using the I/O APIC,
> avoid
> using the PCI IRQ routing table */
>                 if (io_apic_assign_pci_irqs) {
>                         printk(KERN_WARNING "using
> io_apic to assign irqs\n");
>                         pirq_table = NULL;
>                 }
>         }
> 
>         pcibios_enable_irq = pirq_enable_irq;
> 
>         pcibios_fixup_irqs();
>         return 0;
> }
> ---
> 
> 
> 
> 
> --- "Ronald G. Minnich" <rminnich at lanl.gov> wrote:
> > 
> > 
> > On Tue, 1 Mar 2005, Richard Smith wrote:
> > 
> > > I've found that Linux up to 2.6.9 (I haven't
> > tested .10)  Dosen't do
> > > this fully.  With my 440bx chipset there are
> > config registers in the
> > > northbridge that control which IRQ line each of
> > the PCI PIRQ lines are
> > > routed to.  Even with a proper PIRQ table these
> > registers are not setup
> > > and I get the same error reported.
> > 
> > that's whacky. The old linux did fine with 440bx.
> I
> > never had to do 
> > anything but set up PIRQ tables. 
> > 
> > > I suggest you diff the output of lspci -xxx for
> > the northbridge between
> > > linubios and factory bios and resolve all the
> > differences with the
> > > datasheet.
> > 
> > on the geode 2.4.18 always worked, and if I
> patched
> > linux for later 
> > linuxes, that worked fine too. 
> > 
> > What a mess PIRQ got to be .... 
> > 
> > ron
> > 
> 
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