+ To boot the image at the beginning of NAND flash, use these
+ DIP switch settings for S3 S4:
+
+ +------+ +------+
+ | * | | *** |
+ | *** | | * |
+ +------+ ON +------+ ON
+ 4321 4321
+ (where the '*' indicates the position of the tab of the switch.)
+
+ When booting from NAND, use u-boot-nand.bin, not u-boot.bin.
+