sh: Add document for SuperH.

This document is a summary of information concerning SuperH of U-Boot.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

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+
+U-Boot for Renesas SuperH 
+       Last update 08/10/2007 by Nobuhiro Iwamatsu
+
+================================================================================
+0. What's this?
+       This file contains status information for the port of U-Boot to the
+       Renesas SuperH series of CPUs.
+
+================================================================================
+1. Overview
+       SuperH has an original boot loader. However, source code is dirty, and 
+       maintenance is not done.
+       To improve sharing and the maintenance of the code, Nobuhiro Iwamatsu 
+       started the porting to u-boot in 2007. 
+
+================================================================================
+2. Supported CPUs
+
+       2.1. Renesas SH7750/SH7750R
+       2.2. Renesas SH7722
+
+================================================================================
+3. Supported Boards
+
+       3.1. Hitachi UL MS7750SE01/MS7750RSE01
+               Board specific code is in board/ms7750se
+               To use this board, type "make ms7750se_config".
+
+       3.2. Hitachi UL MS7722SE01
+               Board specific code is in board/ms7722se
+               To use this board, type "make ms7722se_config".
+
+       ** README **
+               In SuperH, S-record and binary of made u-boot work on the memory.
+               When u-boot is written in the flash, it is necessary to change the 
+               address by using 'objcopy'.  
+               ex) shX-linux-objcopy -Ibinary -Osrec u-boot.bin u-boot.flash.srec
+       
+================================================================================
+4. Compiler
+       You can use the following of u-boot to compile. 
+               - SuperH Linux Open site
+                       http://www.superh-linux.org/
+               - KPIT GNU tools
+                       http://www.kpitgnutools.com/
+
+================================================================================
+5. Future
+       I plan to support the following CPUs and boards.
+               5.1. CPUs
+                       - SH7710/SH7712 (SH3)
+                       - SH7780(SH4)
+                       - SH7785(SH4)
+               
+               5.2. Boards
+                       - Many boards ;-)
+
+================================================================================
+Copyright (c) 2007
+    Nobuhiro Iwamatsu <iwamatsu@nigaur.org>
+