Add support for KARO TX25 board

This is an i.MX25 base board with only NAND
so it uses nand_spl to boot.

Signed-off-by: John Rigby <jcrigby@gmail.com>

Tune configuration, add support for (redundant) environment in NAND.
Signed-off-by: Wolfgang Denk <wd@denx.de>

Acked-by: Wolfgang Denk <wd@denx.de>
CC: Fred Fan <fanyefeng@gmail.com>
CC: Tom <Tom.Rix@windriver.com>
diff --git a/Makefile b/Makefile
index ca399db..bd0151f 100644
--- a/Makefile
+++ b/Makefile
@@ -3100,6 +3100,10 @@
 		}
 	@$(MKCONFIG) -a $(call xtract_trab,$@) arm arm920t trab NULL s3c24x0
 
+tx25_config	: unconfig
+	@$(MKCONFIG) $(@:_config=) arm arm926ejs tx25 karo mx25
+	@echo "CONFIG_NAND_U_BOOT = y" >> $(obj)include/config.mk
+
 VCMA9_config	:	unconfig
 	@$(MKCONFIG) $(@:_config=) arm arm920t vcma9 mpl s3c24x0