Please try this:
Index: pci/pci_machdep.c
===================================================================
RCS file: /cvs/src/sys/arch/i386/pci/pci_machdep.c,v
retrieving revision 1.66
diff -u -p -r1.66 pci_machdep.c
--- pci/pci_machdep.c 23 Oct 2011 21:18:14 -0000 1.66
+++ pci/pci_machdep.c 4 Dec 2011 17:16:22 -0000
@@ -298,17 +298,19 @@ pci_attach_hook(struct device *parent, s
break;
}
- /*
- * Don't enable MSI on a HyperTransport bus. In order to
- * determine that bus 0 is a HyperTransport bus, we look at
- * device 24 function 0, which is the HyperTransport
- * host/primary interface integrated on most 64-bit AMD CPUs.
- * If that device has a HyperTransport capability, bus 0 must
- * be a HyperTransport bus and we disable MSI.
- */
- tag = pci_make_tag(pc, 0, 24, 0);
- if (pci_get_capability(pc, tag, PCI_CAP_HT, NULL, NULL))
- pba->pba_flags &= ~PCI_FLAGS_MSI_ENABLED;
+ if (pci_mode != 2) {
+ /*
+ * Don't enable MSI on a HyperTransport bus. In order to
+ * determine that bus 0 is a HyperTransport bus, we look at
+ * device 24 function 0, which is the HyperTransport
+ * host/primary interface integrated on most 64-bit AMD CPUs.
+ * If that device has a HyperTransport capability, bus 0 must
+ * be a HyperTransport bus and we disable MSI.
+ */
+ tag = pci_make_tag(pc, 0, 24, 0);
+ if (pci_get_capability(pc, tag, PCI_CAP_HT, NULL, NULL))
+ pba->pba_flags &= ~PCI_FLAGS_MSI_ENABLED;
+ }
}
int
@@ -318,7 +320,7 @@ pci_bus_maxdevs(pci_chipset_tag_t pc, in
/*
* Bus number is irrelevant. If Configuration Mechanism 2 is in
* use, can only have devices 0-15 on any bus. If Configuration
- * Mechanism 1 is in use, can have devices 0-32 (i.e. the `normal'
+ * Mechanism 1 is in use, can have devices 0-31 (i.e. the `normal'
* range).
*/
if (pci_mode == 2)
