add support for kingston 2G UDIMM at 400MHz

Change-Id: I96b97ed379698fb3ca3b51e1daca156b232a74c6

Targets/Bonito3a8780e/Bonito/start.S

@@ -368,12 +368,14 @@ gs_2f_v3_ddr2_cfg:
 #ifdef SOFT_CLKSEL
 
 //#define DDR_LOOPC  80 //667Mhz
-#define DDR_LOOPC  72 //600
+//#define DDR_LOOPC  72 //600
 //#define DDR_LOOPC  60 //500MHz
+#define DDR_LOOPC  48 //400MHz
 #define DDR_REFC   1
 #define DDR_DIV    4
 
 // L1_* define both CPU and Node freq simutanleously
+//#define L1_LOOPC    80//1000
 //#define L1_LOOPC    72//900
 #define L1_LOOPC    64//800
 //#define L1_LOOPC    48//600

pmon/arch/mips/mm/loongson3C_ddr3_leveling.S

@@ -38,13 +38,18 @@ ddr3_leveling:
     bgt     t1, t4, 3f
     nop
 
-
     //<= 500M, for udimm, add rd_oe_start/stop by 0x2 and sub tPHY_RDDATA by 0x1
     //         for rdimm, only sub tPHY_RDDATA by 0x1
     GET_DIMM_TYPE
     bnez    a1, 4f //RDIMM
     nop
 
+    //temp code for Kinston 2G UDIMM, at 400MHz, only sub tPHY_RDDATA by 0x1
+    dli     t4, 12
+    beq     t1, t4, 4f
+    nop
+
+
 /* identify wheather there is ecc slice */
     li      t0, 0x8
     dli     t1, 0x250