diff --git a/src/northbridge/amd/amdk8/Kconfig b/src/northbridge/amd/amdk8/Kconfig
index 21d3c29460..dee7f8e0ba 100644
--- a/src/northbridge/amd/amdk8/Kconfig
+++ b/src/northbridge/amd/amdk8/Kconfig
@@ -119,4 +119,12 @@ config IOMMU
 	bool
 	default y
 
+config CBB
+	hex
+	default 0x00
+
+config CDB
+	hex
+	default 0x18
+
 endif #NORTHBRIDGE_AMD_K8