AMD binaryPI: Allow fine-tuning platform memory configuration

The RDK amd/db-ft3b-lc board will use this for on-board DDR3.

Change-Id: I2ffd38e7e949d3a60487e91188ddaab04b03d4b2
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/12358
Tested-by: build bot (Jenkins)
Reviewed-by: Zheng Bao <zheng.bao@amd.com>

src/northbridge/amd/pi/agesawrapper.c

@@ -26,6 +26,8 @@
 VOID FchInitS3LateRestore (IN FCH_DATA_BLOCK *FchDataPtr);
 VOID FchInitS3EarlyRestore (IN FCH_DATA_BLOCK *FchDataPtr);
 
+void __attribute__((weak)) OemPostParams(AMD_POST_PARAMS *PostParams) {}
+
 #define FILECODE UNASSIGNED_FILE_FILECODE
 
 #ifndef __PRE_RAM__
@@ -132,6 +134,8 @@ AGESA_STATUS agesawrapper_amdinitpost(void)
 	AmdCreateStruct (&AmdParamStruct);
 	PostParams = (AMD_POST_PARAMS *)AmdParamStruct.NewStructPtr;
 
+	OemPostParams(PostParams);
+
 	// Do not use IS_ENABLED here.  CONFIG_GFXUMA should always have a value.  Allow
 	// the compiler to flag the error if CONFIG_GFXUMA is not set.
 	PostParams->MemConfig.UmaMode = CONFIG_GFXUMA ? UMA_AUTO : UMA_NONE;

src/northbridge/amd/pi/agesawrapper.h

@@ -58,4 +58,6 @@ VOID amd_initcpuio(void);
 VOID amd_initmmio(void);
 const void *agesawrapper_locate_module (const CHAR8 name[8]);
 
+void OemPostParams(AMD_POST_PARAMS *PostParams);
+
 #endif /* _AGESAWRAPPER_H_ */