mv6601: added sdram config for 256mb 400mhz ddr3.

diff -u dramregs_400rd_A-MC_ddr3.txt dramregs_256mb_400mhz_ddr3.txt
--- dramregs_400rd_A-MC_ddr3.txt	2013-02-11 13:08:24.234143900 -0800
+++ dramregs_256mb_400mhz_ddr3.txt	2013-04-15 11:46:22.399022506 -0700
@@ -2,7 +2,7 @@
 0xFFD01404 0xB8603000
 0xFFD01408 0x3303555D
 0xFFD0140C 0x16000C3F
-0xFFD01410 0x0000000D
+0xFFD01410 0x00000001
 0xFFD01424 0x0000014F
 0xFFD01428 0x000C5720
 0xFFD0147c 0x0000A471
@@ -13,7 +13,7 @@
 0xFFD01514 0x0FFFFFF8
 0xFFD0151c 0x0FFFFFFc
 0xFFD20004 0x00000000
-0xFFD20000 0x07FF0E01
+0xFFD20000 0x0FFF0E01
 0xFFD015D0 0x00000620
 0xFFD015D4 0x00000044
 0xFFD015D8 0x00000000

Changed CSSingleDeviceSize[3:2] of SDRAM Address Control (0x00001410) from 3
(= 1 Gb) to 0 (= 2 Gb).

Changed Size[31:16] of Window0 Control (0x00020000) from 0x7ff
((0x7ff + 1) * 64 KB = 128 MB) to 0xfff.

Change-Id: I72ed1ab084e9c2019b366a1290343a64e9c477a8
diff --git a/dramregs_256mb_400mhz_ddr3.txt b/dramregs_256mb_400mhz_ddr3.txt
new file mode 100644
index 0000000..368638f
--- /dev/null
+++ b/dramregs_256mb_400mhz_ddr3.txt
@@ -0,0 +1,25 @@
+0xFFD01400 0x43014C30
+0xFFD01404 0xB8603000
+0xFFD01408 0x3303555D
+0xFFD0140C 0x16000C3F
+0xFFD01410 0x00000001
+0xFFD01424 0x0000014F
+0xFFD01428 0x000C5720
+0xFFD0147c 0x0000A471
+0xFFD01494 0x00010000
+0xFFD0149C 0x0000E801
+0xFFD01504 0x07FFFFF0
+0xFFD0150c 0x07FFFFF4
+0xFFD01514 0x0FFFFFF8
+0xFFD0151c 0x0FFFFFFc
+0xFFD20004 0x00000000
+0xFFD20000 0x0FFF0E01
+0xFFD015D0 0x00000620
+0xFFD015D4 0x00000044
+0xFFD015D8 0x00000000
+0xFFD015DC 0x00000000
+0xFFD015E0 0x00000001
+0xFFD015E4 0x00203C18
+0xFFD01620 0x00380000
+0xFFD014B0 0x0000000F
+0xFFD01480 0x00000001