Enable xmodem support

This is a trivial patch that just enables xmodem downloads using the existing
ymodem framework.

Signed-off-by: Angus Ainslie <angus@akkea.ca>

common/cmd_load.c

@@ -18,7 +18,7 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 #if defined(CONFIG_CMD_LOADB)
-static ulong load_serial_ymodem(ulong offset);
+static ulong load_serial_ymodem(ulong offset, int mode);
 #endif
 
 #if defined(CONFIG_CMD_LOADS)
@@ -462,7 +462,15 @@ static int do_load_serial_bin(cmd_tbl_t *cmdtp, int flag, int argc,
 			offset,
 			load_baudrate);
 
-		addr = load_serial_ymodem(offset);
+		addr = load_serial_ymodem(offset, xyzModem_ymodem);
+
+	} else if (strcmp(argv[0],"loadx")==0) {
+		printf("## Ready for binary (xmodem) download "
+			"to 0x%08lX at %d bps...\n",
+			offset,
+			load_baudrate);
+
+		addr = load_serial_ymodem(offset, xyzModem_xmodem);
 
 	} else {
 
@@ -942,7 +950,7 @@ static int getcxmodem(void) {
 		return (getc());
 	return -1;
 }
-static ulong load_serial_ymodem(ulong offset)
+static ulong load_serial_ymodem(ulong offset, int mode)
 {
 	int size;
 	int err;
@@ -953,7 +961,7 @@ static ulong load_serial_ymodem(ulong offset)
 	ulong addr = 0;
 
 	size = 0;
-	info.mode = xyzModem_ymodem;
+	info.mode = mode;
 	res = xyzModem_stream_open(&info, &err);
 	if (!res) {
 
@@ -1056,6 +1064,14 @@ U_BOOT_CMD(
 );
 
 U_BOOT_CMD(
+	loadx, 3, 0,	do_load_serial_bin,
+	"load binary file over serial line (xmodem mode)",
+	"[ off ] [ baud ]\n"
+	"    - load binary file over serial line"
+	" with offset 'off' and baudrate 'baud'"
+);
+
+U_BOOT_CMD(
 	loady, 3, 0,	do_load_serial_bin,
 	"load binary file over serial line (ymodem mode)",
 	"[ off ] [ baud ]\n"