i7core_edac: Add a code to probe Xeon 55xx bus

This code changes the detection procedure of i7core_edac. Instead of
directly probing for MC registers, it probes for another register found
on Nehalem. If found, it tries to pick the first MC PCI BUS. This should
work fine with Xeon 35xx, but, on Xeon 55xx, this is at bus 254 and 255
that are not properly detected by the non-legacy PCI methods.

The new detection code scans specifically at buses 254 and 255 for the
Xeon 55xx devices.

This code has not tested yet. After working, a change at the code will
be needed, since the i7core is not yet ready for working with 2 sets of
MC.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
index c734c27..d6cc2ed 100644
--- a/arch/x86/pci/legacy.c
+++ b/arch/x86/pci/legacy.c
@@ -57,6 +57,7 @@ void pcibios_scan_specific_bus(int busn)
 		}
 	}
 }
+EXPORT_SYMBOL_GPL(pcibios_scan_specific_bus);
 
 int __init pci_subsys_init(void)
 {