ppc4xx: Initial framework of the AMCC PPC460SX redwood reference board.

Add AMCC Redwood reference board that uses the latest
PPC 464 CPU processor combined with a rich mix of peripheral
controllers. The board will support PCIe, mutiple Gig ethernet
ports, advanced hardware RAID assistance and IEEE 1588.

Signed-off-by: Feng Kan <fkan@amcc.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/Makefile b/Makefile
index e557d0d..10a3e06 100644
--- a/Makefile
+++ b/Makefile
@@ -1418,6 +1418,9 @@
 	@echo "TEXT_BASE = 0x01000000" > $(obj)board/amcc/sequoia/config.tmp
 	@echo "CONFIG_NAND_U_BOOT = y" >> $(obj)include/config.mk
 
+redwood_config: unconfig
+	@$(MKCONFIG) $(@:_config=) ppc ppc4xx redwood amcc
+
 sc3_config:unconfig
 	@$(MKCONFIG) $(@:_config=) ppc ppc4xx sc3