[PATCH 3/7] scripts: kwboot: improve diagnostic output

[Uwe Kleine-König]

After entering uart boot mode the CPU prints some diagnostic messages.
Showing them to the user helps her to notice when the message window was
missed or there is an other problem.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
---
 scripts/kwboot.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/scripts/kwboot.c b/scripts/kwboot.c
index 9dfaf4a8dfb0..0a089b593625 100644
--- a/scripts/kwboot.c
+++ b/scripts/kwboot.c
@@ -9,6 +9,7 @@
  *   2008. Chapter 24.2 "BootROM Firmware".
  */
 
+#include <ctype.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -285,12 +286,20 @@ kwboot_bootmsg(int tty, void *msg)
 		}
 
 		rc = kwboot_tty_recv(tty, &c, 1, KWBOOT_MSG_RSP_TIMEO);
-
-		kwboot_spinner();
+		while (!rc && c != NAK) {
+			if (c == '\\')
+				kwboot_printv("\\\\", c);
+			else if (isprint(c) || c == '\r' || c == '\n')
+				kwboot_printv("%c", c);
+			else
+				kwboot_printv("\\x%02hhx", c);
+
+			rc = kwboot_tty_recv(tty, &c, 1, KWBOOT_MSG_RSP_TIMEO);
+		}
 
 	} while (rc || c != NAK);
 
-	kwboot_printv("\n");
+	kwboot_printv("\nGot expected NAK\n");
 
 	return rc;
 }
-- 
2.9.3