diff --git a/lib_arm/armlinux.c b/lib_arm/armlinux.c
index ca630b3..dba2ff7 100644
--- a/lib_arm/armlinux.c
+++ b/lib_arm/armlinux.c
@@ -124,7 +124,7 @@
 		checksum = ntohl (hdr->ih_hcrc);
 		hdr->ih_hcrc = 0;
 
-		if (crc32 (0, (char *) data, len) != checksum) {
+		if (crc32 (0, (unsigned char *) data, len) != checksum) {
 			printf ("Bad Header Checksum\n");
 			SHOW_BOOT_PROGRESS (-11);
 			do_reset (cmdtp, flag, argc, argv);
@@ -148,7 +148,7 @@
 			ulong csum = 0;
 
 			printf ("   Verifying Checksum ... ");
-			csum = crc32 (0, (char *) data, len);
+			csum = crc32 (0, (unsigned char *) data, len);
 			if (csum != ntohl (hdr->ih_dcrc)) {
 				printf ("Bad Data CRC\n");
 				SHOW_BOOT_PROGRESS (-12);
diff --git a/lib_arm/board.c b/lib_arm/board.c
index c73cf0c..7663908 100644
--- a/lib_arm/board.c
+++ b/lib_arm/board.c
@@ -121,7 +121,7 @@
 
 static int init_baudrate (void)
 {
-	uchar tmp[64];	/* long enough for environment variables */
+	char tmp[64];	/* long enough for environment variables */
 	int i = getenv_r ("baudrate", tmp, sizeof (tmp));
 	gd->bd->bi_baudrate = gd->baudrate = (i > 0)
 			? (int) simple_strtoul (tmp, NULL, 10)
@@ -235,9 +235,11 @@
 
 void start_armboot (void)
 {
-	ulong size;
 	init_fnc_t **init_fnc_ptr;
 	char *s;
+#ifndef CFG_NO_FLASH
+	ulong size;
+#endif
 #if defined(CONFIG_VFD) || defined(CONFIG_LCD)
 	unsigned long addr;
 #endif
@@ -320,7 +322,7 @@
 		int i;
 		ulong reg;
 		char *s, *e;
-		uchar tmp[64];
+		char tmp[64];
 
 		i = getenv_r ("ethaddr", tmp, sizeof (tmp));
 		s = (i > 0) ? tmp : NULL;