3 files changed, 6 insertions, 6 deletions
diff --git a/lib/cc-usb.c b/lib/cc-usb.c
index 09b06bb5..9df2e312 100644
--- a/lib/cc-usb.c
+++ b/lib/cc-usb.c
@@ -317,13 +317,11 @@ cc_usb_reset(struct cc_usb *cc)
 static struct termios	save_termios;
 
 struct cc_usb *
-cc_usb_open(void)
+cc_usb_open(char *tty)
 {
 	struct cc_usb	*cc;
-	char		*tty;
 	struct termios	termios;
 	
-	tty = getenv("CCDBG_TTY");
 	if (!tty)
 		tty = DEFAULT_TTY;
 	cc = calloc (sizeof (struct cc_usb), 1);
diff --git a/lib/cc-usb.h b/lib/cc-usb.h
index 2adccb93..d7acfbd2 100644
--- a/lib/cc-usb.h
+++ b/lib/cc-usb.h
@@ -24,7 +24,7 @@
 struct cc_usb;
 
 struct cc_usb *
-cc_usb_open(void);
+cc_usb_open(char *tty);
 
 void
 cc_usb_close(struct cc_usb *cc);
diff --git a/lib/ccdbg-io.c b/lib/ccdbg-io.c
index acd44f10..9c6693cd 100644
--- a/lib/ccdbg-io.c
+++ b/lib/ccdbg-io.c
@@ -21,18 +21,20 @@
 #include "cc-usb.h"
 #include "cc-bitbang.h"
 
-
 struct ccdbg *
 ccdbg_open(void)
 {
 	struct ccdbg *dbg;
+	char *tty;
 
 	dbg = calloc(sizeof (struct ccdbg), 1);
 	if (!dbg) {
 		perror("calloc");
 		return NULL;
 	}
-	dbg->usb = cc_usb_open();
+	tty = getenv("CCDBG_TTY");
+	if (!tty || tty[0] == '/')
+		dbg->usb = cc_usb_open(tty);
 	if (!dbg->usb) {
 		dbg->bb = cc_bitbang_open();
 		if (!dbg->bb) {