NAND: add the ability to directly write yaffs image

This patch add addition suffix to nand write to give the uboot
the power to directly burn the yaffs image to nand.

Signed-off-by: Lei Wen <leiwen@marvell.com>
diff --git a/common/cmd_nand.c b/common/cmd_nand.c
index 6783645..7bd37de 100644
--- a/common/cmd_nand.c
+++ b/common/cmd_nand.c
@@ -574,7 +574,15 @@
 							 (u_char *)addr);
 			else
 				ret = nand_write_skip_bad(nand, off, &rwsize,
-							  (u_char *)addr);
+							  (u_char *)addr, 0);
+#ifdef CONFIG_CMD_NAND_YAFFS
+		} else if (!strcmp(s, ".yaffs")) {
+			if (read) {
+				printf("Unknown nand command suffix '%s'.\n", s);
+				return 1;
+			}
+			ret = nand_write_skip_bad(nand, off, &rwsize, (u_char *)addr, 1);
+#endif
 		} else if (!strcmp(s, ".oob")) {
 			/* out-of-band data */
 			mtd_oob_ops_t ops = {
@@ -680,6 +688,11 @@
 	"nand write - addr off|partition size\n"
 	"    read/write 'size' bytes starting at offset 'off'\n"
 	"    to/from memory address 'addr', skipping bad blocks.\n"
+#ifdef CONFIG_CMD_NAND_YAFFS
+	"nand write.yaffs - addr off|partition size\n"
+	"    write 'size' bytes starting at offset 'off' with yaffs format\n"
+	"    from memory address 'addr', skipping bad blocks.\n"
+#endif
 	"nand erase[.spread] [clean] [off [size]] - erase 'size' bytes "
 	"from offset 'off'\n"
 	"    With '.spread', erase enough for given file size, otherwise,\n"