[coreboot-gerrit] New patch to review for coreboot: northbridge/amd/amdmct: Reduce maximum number of DDR3 DIMMs

[Timothy Pearson (tpearson@raptorengineeringinc.com)]

Timothy Pearson (tpearson at raptorengineeringinc.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/12107

-gerrit

commit fa336d0efd314418ee23d02cae1d169cce4530f5
Author: Timothy Pearson <tpearson at raptorengineeringinc.com>
Date:   Tue Oct 20 21:32:09 2015 -0500

    northbridge/amd/amdmct: Reduce maximum number of DDR3 DIMMs
    
    CAR space on certain platforms is nearly full.  This prevents the
    addition of necessary RAM initialization features such as x4 DIMM
    support.  As the DIMM SPD cache uses a sizeable amount of CAR RAM,
    reducing it would free up a significant amount of CAR RAM.
    
    DDR3-based AMD platforms only support up to 3 physical DIMMs on
    each channel (6 per node).  Reduce the maximum number of DIMMs
    on a node from 8 to 6 accordingly.
    
    Change-Id: I38def86da76fc622785318c825670209b2ac9017
    Signed-off-by: Timothy Pearson <tpearson at raptorengineeringinc.com>
---
 src/northbridge/amd/amdmct/wrappers/mcti.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/northbridge/amd/amdmct/wrappers/mcti.h b/src/northbridge/amd/amdmct/wrappers/mcti.h
index 2aba377..ef6e3dc 100644
--- a/src/northbridge/amd/amdmct/wrappers/mcti.h
+++ b/src/northbridge/amd/amdmct/wrappers/mcti.h
@@ -51,7 +51,11 @@ UPDATE AS NEEDED
 #endif
 
 #ifndef MAX_DIMMS_SUPPORTED
-#define MAX_DIMMS_SUPPORTED		8
+#if IS_ENABLED(CONFIG_DIMM_DDR3)
+ #define MAX_DIMMS_SUPPORTED		6
+#else
+ #define MAX_DIMMS_SUPPORTED		8
+#endif
 #endif
 
 #ifndef MAX_CS_SUPPORTED