Add support for SBC8641D. Config files.

Add support for Wind River's SBC8641D reference board.

Signed-off by: Joe Hamman <joe.hamman@embeddedspecialties.com>
Acked-by: Wolfgang Denk <wd@denx.de>
Acked-by: Jon Loeliger <jdl@freescale.com>
diff --git a/doc/README.sbc8641d b/doc/README.sbc8641d
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+Wind River SBC8641D reference board
+===========================
+
+Created 06/14/2007 Joe Hamman
+Copyright 2007, Embedded Specialties, Inc.
+Copyright 2007 Wind River Systemes, Inc.
+-----------------------------
+
+1. Building U-Boot
+------------------
+The SBC8641D code is known to build using ELDK 4.1.
+
+    $ make sbc8641d_config
+    Configuring for sbc8641d board...
+
+    $ make
+
+
+2. Switch and Jumper Settings
+-----------------------------
+All Jumpers & Switches are in their default positions.  Please refer to
+the board documentation for details.  Some settings control CPU voltages
+and settings may change with board revisions.
+
+3. Known limitations
+--------------------
+PCI:
+	The PCI command may hang if no boards are present in either slot.