tools: kwboot: Remove code for handling CAN byte

It is unknown why handling of CAN byte was added into kwboot tool as
Marvell BootROM does not support CAN byte. It never sends CAN byte to host
and if host sends CAN byte BootROM handles it as an unknown byte.

Remove code for handling and sending CAN bytes from the kwboot tool.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>

1 files changed, 5 insertions, 11 deletions

diff --git a/tools/kwboot.c b/tools/kwboot.c
index be9a751406..0b97990d09 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -63,7 +63,6 @@ static unsigned char kwboot_msg_debug[] = {
 #define EOT	4	/* sender end of block transfer */
 #define ACK	6	/* target block ack */
 #define NAK	21	/* target block negative ack */
-#define CAN	24	/* target/sender transfer cancellation */
 
 #define KWBOOT_XM_BLKSZ	128 /* xmodem block size */
 
@@ -826,7 +825,7 @@ _now(void)
 static int
 _is_xm_reply(char c)
 {
-	return c == ACK || c == NAK || c == CAN;
+	return c == ACK || c == NAK;
 }
 
 static int
@@ -841,9 +840,6 @@ _xm_reply_to_error(int c)
 	case NAK:
 		errno = EBADMSG;
 		break;
-	case CAN:
-		errno = ECANCELED;
-		break;
 	default:
 		errno = EPROTO;
 		break;
@@ -966,7 +962,7 @@ kwboot_xm_sendblock(int fd, struct kwboot_block *block, int allow_non_xm,
 	do {
 		rc = kwboot_tty_send(fd, block, sizeof(*block), 1);
 		if (rc)
-			return rc;
+			goto err;
 
 		if (allow_non_xm && !*done_print) {
 			kwboot_progress(100, '.');
@@ -979,7 +975,7 @@ kwboot_xm_sendblock(int fd, struct kwboot_block *block, int allow_non_xm,
 					  allow_non_xm, &non_xm_print,
 					  baudrate, &baud_changed);
 		if (rc)
-			goto can;
+			goto err;
 
 		if (!allow_non_xm && c != ACK)
 			kwboot_progress(-1, '+');
@@ -990,15 +986,13 @@ kwboot_xm_sendblock(int fd, struct kwboot_block *block, int allow_non_xm,
 
 	if (allow_non_xm && baudrate && !baud_changed) {
 		fprintf(stderr, "Baudrate was not changed\n");
-		rc = -1;
 		errno = EPROTO;
-		goto can;
+		return -1;
 	}
 
 	return _xm_reply_to_error(c);
-can:
+err:
 	err = errno;
-	kwboot_tty_send_char(fd, CAN);
 	kwboot_printv("\n");
 	errno = err;
 	return rc;