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SubjectAthlon: Try this (was: Re: Athlon bug stomping #2)
On Fri, 14 Sep 2001, Roberto Jung Drebes wrote:

> On 13 Sep 2001, Eric W. Biederman wrote:
>
> > Anyone want to generate a kernel patch so this fix can get some wider
> > testing?
>
> I'll try to isolate the single bit in the register that is causing the
> fault and will send the diff.

I tested here and it seems that bit 7 is responsible. Here is the diff to
pci-pc.c:

=================================================
--- linux-2.4.9/arch/i386/kernel/pci-pc.c.orig Fri Sep 14 05:03:59 2001
+++ linux-2.4.9/arch/i386/kernel/pci-pc.c Fri Sep 14 05:12:28 2001
@@ -701,6 +701,22 @@
return rt;
}

+/* Fixes some oopses on fast_copy_page when it uses 'movntq's
+ * instead of 'movq's on Athlon/Duron optimized kernels.
+ * Bit 7 at offset 0x55 seems to be responsible.
+ * > Device 0 Offset 55 - Debug (RW)
+ * > 7-0 Reserved (do not program). default = 0
+ * > *** ABIT KT7A 3R BIOS: non-zero!? (oopses)
+ * > *** ABIT KT7A YH BIOS: zero. (works)
+ */
+static void __init pci_fixup_athlon_bug(struct pci_dev *d)
+{
+ u8 v;
+ printk("Trying to stomp on Athlon bug...\n");
+ pci_read_config_byte(d, 0x55, &v);
+ v &= 0x7f; /* clear bit 55.7 */
+ pci_write_config_byte(d, 0x55, v);
+}

int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq)
{
@@ -966,6 +982,8 @@
{ PCI_FIXUP_HEADER, PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases },
{ PCI_FIXUP_HEADER, PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency },
{ PCI_FIXUP_HEADER, PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency },
+ { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8363_0,
+ pci_fixup_athlon_bug },
{ PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3, pci_fixup_piix4_acpi },
{ 0 }
};
=================================================
--
Roberto Jung Drebes <drebes@inf.ufrgs.br>
Porto Alegre, RS - Brasil
http://www.inf.ufrgs.br/~drebes/

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