diff --git a/board/esd/cms700/cms700.c b/board/esd/cms700/cms700.c
index 649619d..e4cfe14 100644
--- a/board/esd/cms700/cms700.c
+++ b/board/esd/cms700/cms700.c
@@ -114,7 +114,7 @@
 
 int checkboard (void)
 {
-	unsigned char str[64];
+	char str[64];
 	int flashcnt;
 	int delay;
 	volatile unsigned char *led_reg = (unsigned char *)((ulong)CFG_PLD_BASE + 0x1000);
diff --git a/board/esd/common/auto_update.c b/board/esd/common/auto_update.c
index d48e972..1decc0e 100644
--- a/board/esd/common/auto_update.c
+++ b/board/esd/common/auto_update.c
@@ -283,7 +283,7 @@
 		 */
 		if (au_image[i].type != AU_NAND) {
 			debug ("flash_write(%p, %lx %x)\n", addr, start, nbytes);
-			rc = flash_write((uchar *)addr, start, nbytes);
+			rc = flash_write((char *)addr, start, nbytes);
 		} else {
 #if (CONFIG_COMMANDS & CFG_CMD_NAND)
 			debug ("nand_rw(%p, %lx %x)\n", addr, start, nbytes);
diff --git a/board/esd/hh405/hh405.c b/board/esd/hh405/hh405.c
index 3158803..9c582b1 100644
--- a/board/esd/hh405/hh405.c
+++ b/board/esd/hh405/hh405.c
@@ -590,7 +590,7 @@
 {
 	DECLARE_GLOBAL_DATA_PTR;
 
-	unsigned char str[64];
+	char str[64];
 	int i = getenv_r ("serial#", str, sizeof(str));
 
 	puts ("Board: ");
diff --git a/board/esd/vom405/vom405.c b/board/esd/vom405/vom405.c
index 445b8fc..bc5fa7c 100644
--- a/board/esd/vom405/vom405.c
+++ b/board/esd/vom405/vom405.c
@@ -97,7 +97,7 @@
 
 int checkboard (void)
 {
-	unsigned char str[64];
+	char str[64];
 	int i = getenv_r ("serial#", str, sizeof(str));
 	int flashcnt;
 	int delay;