添加winbond ddr参数调整

doc/重要说明.txt

@@ -0,0 +1 @@
+1. ARK1668E项目如果使用WINBOND DDR，需要修改u-boot/arch/arm/mach-arkmicro/ddr_ark1668e.c文件，将DDR_WINBOND宏定义注释放开。

u-boot/arch/arm/mach-arkmicro/ddr_ark1668e.c

@@ -1,6 +1,7 @@
 #include <common.h>
 #define DDR_256MX16   1
 #define DDR_128MX16   0
+//#define DDR_WINBOND
 #define DDR3_REG_BASE  0xE9100000
 #define AHB_SYS_BASE   0xE4900000
 #define rDDR_MCCR   	    *((volatile unsigned int *)(DDR3_REG_BASE + 0x00))
@@ -334,11 +335,19 @@ unsigned int ddr3_sdramc_init(void)
 //    rDDR_PHYCR0  = 1 << 13 | 1 << 11 | 1 << 10 | 1 << 9 | 1 << 8 | 4<<4 | 4<<0;
     rDDR_PHYCR0  = 1 << 13 | 1 << 11 | 1 << 10 | 1 << 9 | 1 << 8 | 2<<4 | 2<<0;
 
+#ifdef DDR_WINBOND
+//0x24
+    rDDR_PHYRDTR   =  8<<4 | 8<<0;
+
+//0x130
+    rDDR_PHYRDTFR  	 =  8<<4 | 8<<0;
+#else
 //0x24
     rDDR_PHYRDTR   =  9<<4 | 9<<0;
 
 //0x130
     rDDR_PHYRDTFR  	 =  9<<4 | 9<<0;
+#endif
 
  //0x78
     rDDR_WRDLLCR     =  10<<4 | 10<<0;
@@ -415,4 +424,4 @@ unsigned int ddr3_sdramc_init(void)
 
 	printf("DDR3 256*16_20221130\n");
     return 0;
-}
+}