diff --git a/board/trab/auto_update.c b/board/trab/auto_update.c
index 056e562..442c555 100644
--- a/board/trab/auto_update.c
+++ b/board/trab/auto_update.c
@@ -222,7 +222,7 @@
 	/* check the data CRC */
 	checksum = ntohl(hdr->ih_dcrc);
 
-	if (crc32 (0, (char *)(LOAD_ADDR + sizeof(*hdr)), ntohl(hdr->ih_size))
+	if (crc32 (0, (uchar *)(LOAD_ADDR + sizeof(*hdr)), ntohl(hdr->ih_size))
 		!= checksum)
 	{
 		printf ("Image %s bad data checksum\n", aufile[idx]);
@@ -261,7 +261,7 @@
 	checksum = ntohl(hdr->ih_hcrc);
 	hdr->ih_hcrc = 0;
 
-	if (crc32 (0, (char *)hdr, sizeof(*hdr)) != checksum) {
+	if (crc32 (0, (uchar *)hdr, sizeof(*hdr)) != checksum) {
 		printf ("Image %s bad header checksum\n", aufile[idx]);
 		return -1;
 	}
@@ -397,7 +397,7 @@
 	}
 
 	/* check the dcrc of the copy */
-	if (crc32 (0, (char *)(start + off), ntohl(hdr->ih_size)) != ntohl(hdr->ih_dcrc)) {
+	if (crc32 (0, (uchar *)(start + off), ntohl(hdr->ih_size)) != ntohl(hdr->ih_dcrc)) {
 		printf ("Image %s Bad Data Checksum After COPY\n", aufile[idx]);
 		return -1;
 	}
@@ -613,7 +613,8 @@
 #define VFD_LOGO_WIDTH 112
 #define VFD_LOGO_HEIGHT 72
 				/* must call transfer_pic directly */
-				transfer_pic(3, env, VFD_LOGO_HEIGHT, VFD_LOGO_WIDTH);
+				transfer_pic(3, (unsigned char *)env,
+					     VFD_LOGO_HEIGHT, VFD_LOGO_WIDTH);
 			}
 			bitmap_first = 1;
 		}