need to apply after
x86_64: check MSR to get MMCONFIG for AMD Family 10h Opteron v3
some BIOS only let AMD fam 10h handle bus0, and nvidia mcp55/ck804
to handle other buses. at that case MCFG will cover all over them.
this patch will skip it so to use MCFG later.
Signed-off-by: Yinghai Lu <[EMAIL PROTECTED]>
Index: linux-2.6/arch/x86/pci/mmconfig-shared.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/mmconfig-shared.c
+++ linux-2.6/arch/x86/pci/mmconfig-shared.c
@@ -123,6 +123,14 @@ static const char __init *pci_mmcfg_amd_
busnbits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
FAM10H_MMIO_CONF_BUSRANGE_MASK;
+
+ /*
+ * only handle bus 0 ?
+ * need to skip it
+ */
+ if (!busnbits)
+ return NULL;
+
if (busnbits > 8) {
segnbits = busnbits - 8;
busnbits = 8;
--
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