sh: Add Renesas rsk7264 board

The rsk7264 (also know as rsk2+sh7264) is an SH2A based board
with 64MB NAND flash and 64MB SDRAM. It is very similar to the
rsk7203 board.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/arch/sh/cpu/sh2/cpu.c b/arch/sh/cpu/sh2/cpu.c
index 6bbedd9..fff25ac 100644
--- a/arch/sh/cpu/sh2/cpu.c
+++ b/arch/sh/cpu/sh2/cpu.c
@@ -33,6 +33,9 @@
 #define scif0_enable() do {\
 		writeb(readb(STBCR4) & ~0x80, STBCR4);\
 	} while (0)
+#define scif3_enable() do {\
+		writeb(readb(STBCR4) & ~0x10, STBCR4);\
+	} while (0)
 
 int checkcpu(void)
 {
@@ -47,7 +50,11 @@
 int cpu_init(void)
 {
 	/* SCIF enable */
+#if defined(CONFIG_CONS_SCIF3)
+	scif3_enable();
+#else
 	scif0_enable();
+#endif
 	/* CMT clock enable */
 	cmt_clock_enable() ;
 	return 0;