Steven Sherk (steven.sh...@se-eng.com) just uploaded a new patch set to gerrit, 
which you can find at http://review.coreboot.org/2248

-gerrit

commit 744bd8e3717e4291ec146abf5542a9458368f990
Author: Steven Sherk <steven.sh...@se-eng.com>
Date:   Wed Jan 30 16:02:14 2013 -0700

    Add MMCONF resource to AMD fam15 PCI_DOMAIN
    
    This is a port of the following:
    commit d5c998be99709c92f200b3b08aed2ca3fee2d519
    
        The coreboot resource allocator doesn't respect resources
        claimed in the APIC_CLUSTER. Move the MMCONF resource to the
        PCI_DOMAIN to prevent overlap with PCI devices.
    
    original-Change-Id: I8541795f69bbdd9041b390103fb901d37e07eeb9
        Signed-off-by: Marc Jones <marc.jo...@se-eng.com>
        URL - http://review.coreboot.org/#/c/2167/
    
    Change-Id: I6e585d5cf0d46bd58337a6801fb0690ab2dd000c
    Signed-off-by: Steven Sherk <steven.sh...@se-eng.com>
---
 src/northbridge/amd/agesa/family15/northbridge.c | 32 +++++++++++++++---------
 1 file changed, 20 insertions(+), 12 deletions(-)

diff --git a/src/northbridge/amd/agesa/family15/northbridge.c 
b/src/northbridge/amd/agesa/family15/northbridge.c
index 2ab0e3e..6fb3105 100644
--- a/src/northbridge/amd/agesa/family15/northbridge.c
+++ b/src/northbridge/amd/agesa/family15/northbridge.c
@@ -341,6 +341,20 @@ static void nb_read_resources(device_t dev)
                        amdfam15_link_read_bases(dev, nodeid, link->link_num);
                }
        }
+
+       /*
+        * This MMCONF resource must be reserved in the PCI_DOMAIN.
+        * It is not honored by the coreboot resource allocator if it is in
+        * the APIC_CLUSTER.
+        */
+#if CONFIG_MMCONF_SUPPORT
+       struct resource *resource = new_resource(dev, 0xc0010058);
+       resource->base = CONFIG_MMCONF_BASE_ADDRESS;
+       resource->size = CONFIG_MMCONF_BUS_NUMBER * 4096 * 256;
+       resource->flags = IORESOURCE_MEM | IORESOURCE_RESERVE |
+           IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED;
+#endif
+
 }
 
 
@@ -448,6 +462,12 @@ static void nb_set_resources(device_t dev)
                        assign_resources(bus);
                }
        }
+
+       /* Print the MMCONF region if it has been reserved. */
+       res = find_resource(dev, 0xc0010058);
+       if (res) {
+               report_resource_stored(dev, res, " <mmconfig>");
+       }
 }
 
 static void northbridge_init(struct device *dev)
@@ -1095,22 +1115,10 @@ static void cpu_bus_noop(device_t dev)
 
 static void cpu_bus_read_resources(device_t dev)
 {
-#if CONFIG_MMCONF_SUPPORT
-       struct resource *resource = new_resource(dev, 0xc0010058);
-       resource->base = CONFIG_MMCONF_BASE_ADDRESS;
-       resource->size = CONFIG_MMCONF_BUS_NUMBER * 4096*256;
-       resource->flags = IORESOURCE_MEM | IORESOURCE_RESERVE |
-               IORESOURCE_FIXED | IORESOURCE_STORED |  IORESOURCE_ASSIGNED;
-#endif
 }
 
 static void cpu_bus_set_resources(device_t dev)
 {
-       struct resource *resource = find_resource(dev, 0xc0010058);
-       if (resource) {
-               report_resource_stored(dev, resource, " <mmconfig>");
-       }
-       pci_dev_set_resources(dev);
 }
 
 static struct device_operations cpu_bus_ops = {

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