sh: Add support for ecovec board

The ecovec board has SH7724, 256MB DDR2-SDRAM, USB,
Ethernet, and more.

This patch supports the following functions:
	- 256MB DDR2-SDRAM
	- USB
	- I2C
	- Ethernet

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/boards.cfg b/boards.cfg
index 67b2d59..d9021aa 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -993,6 +993,7 @@
 sh7785lcr                    sh          sh4         sh7785lcr           renesas        -
 sh7785lcr_32bit              sh          sh4         sh7785lcr           renesas        -           sh7785lcr:SH_32BIT=1
 MigoR                        sh          sh4         MigoR               renesas        -
+ecovec                       sh          sh4         ecovec              renesas        -
 grsim_leon2                  sparc       leon2       -                   gaisler
 gr_cpci_ax2000               sparc       leon3       -                   gaisler
 gr_ep2s60                    sparc       leon3       -                   gaisler