From: <aleksey_gorelov@phoenix.com>

Hopefully fix http://bugzilla.kernel.org/show_bug.cgi?id=5235

Similar problem has been reported before here:
http://groups.google.com/group/linux.kernel/browse_thread/thread/def4ca19dbc3cd4/5cffbf349f2c87a4?tvc=2&q=Aleksey+Gorelov&hl=en#5cffbf349f2c87a4
and was related to bug in BIOS reporting 82C686 router compatible to 586.

I suspect BIOS on this board has similar issue: reports VT8235 router to be
compatible with 586 one - which is obviously not true.  Patch from the link
above has already incorporated in both 2.6 & 2.4 series, but might not work
in this particular case.

Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 arch/i386/pci/irq.c |   55 ++++++++++++++++++++++++++++++++++------------------
 1 files changed, 36 insertions(+), 19 deletions(-)

diff -puN arch/i386/pci/irq.c~asus-vt8235-router-buggy-bios-workaround arch/i386/pci/irq.c
--- devel/arch/i386/pci/irq.c~asus-vt8235-router-buggy-bios-workaround	2005-10-11 00:34:42.000000000 -0700
+++ devel-akpm/arch/i386/pci/irq.c	2005-10-11 00:34:42.000000000 -0700
@@ -547,31 +547,48 @@ static __init int intel_router_probe(str
 	return 0;
 }
 
-static __init int via_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
+static __init int via_router_probe(struct irq_router *r,
+				struct pci_dev *router, u16 device)
 {
 	/* FIXME: We should move some of the quirk fixup stuff here */
 
-	if (router->device == PCI_DEVICE_ID_VIA_82C686 &&
-			device == PCI_DEVICE_ID_VIA_82C586_0) {
-		/* Asus k7m bios wrongly reports 82C686A as 586-compatible */
-		device = PCI_DEVICE_ID_VIA_82C686;
+	/*
+	 * work arounds for some buggy BIOSes
+	 */
+	if (device == PCI_DEVICE_ID_VIA_82C586_0) {
+		switch(router->device) {
+		case PCI_DEVICE_ID_VIA_82C686:
+			/*
+			 * Asus k7m bios wrongly reports 82C686A
+			 * as 586-compatible
+			 */
+			device = PCI_DEVICE_ID_VIA_82C686;
+			break;
+		case PCI_DEVICE_ID_VIA_8235:
+			/**
+			 * Asus a7v-x bios wrongly reports 8235
+			 * as 586-compatible
+			 */
+			device = PCI_DEVICE_ID_VIA_8235;
+			break;
+		}
 	}
 
-	switch(device)
-	{
-		case PCI_DEVICE_ID_VIA_82C586_0:
-			r->name = "VIA";
-			r->get = pirq_via586_get;
-			r->set = pirq_via586_set;
-			return 1;
-		case PCI_DEVICE_ID_VIA_82C596:
-		case PCI_DEVICE_ID_VIA_82C686:
-		case PCI_DEVICE_ID_VIA_8231:
+	switch(device) {
+	case PCI_DEVICE_ID_VIA_82C586_0:
+		r->name = "VIA";
+		r->get = pirq_via586_get;
+		r->set = pirq_via586_set;
+		return 1;
+	case PCI_DEVICE_ID_VIA_82C596:
+	case PCI_DEVICE_ID_VIA_82C686:
+	case PCI_DEVICE_ID_VIA_8231:
+	case PCI_DEVICE_ID_VIA_8235:
 		/* FIXME: add new ones for 8233/5 */
-			r->name = "VIA";
-			r->get = pirq_via_get;
-			r->set = pirq_via_set;
-			return 1;
+		r->name = "VIA";
+		r->get = pirq_via_get;
+		r->set = pirq_via_set;
+		return 1;
 	}
 	return 0;
 }
_