runqemu: Fix detection of -serial parameter

The pattern `-serial` matches also `-device usb-serial` and `virtio-serial`
which are not the desired parameter. This causes the serial console ttyS1 is
missing and Systemd's getty@ttyS1 fails constantly.

(From OE-Core rev: 44c1f003d617ac20527926b4b321ffd1fe4462bb)

Signed-off-by: Jörg Sommer <joerg.sommer@navimatix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit b6d035894120b45b42f146ab5b3110522c58d178)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/scripts/runqemu b/scripts/runqemu
index fe395d1bc6..2ab36fd03d 100755
--- a/scripts/runqemu
+++ b/scripts/runqemu
@@ -1487,7 +1487,7 @@ to your build configuration.
         # If no serial or serialtcp options were specified, only ttyS0 is created
         # and sysvinit shows an error trying to enable ttyS1:
         #     INIT: Id "S1" respawning too fast: disabled for 5 minutes
-        serial_num = len(re.findall("-serial", self.qemu_opt))
+        serial_num = len(re.findall("(^| )-serial ", self.qemu_opt))
 
         # Assume if the user passed serial options, they know what they want
         # and pad to two devices
@@ -1507,7 +1507,7 @@ to your build configuration.
 
                 self.qemu_opt += " %s" % self.get("QB_SERIAL_OPT")
 
-        serial_num = len(re.findall("-serial", self.qemu_opt))
+        serial_num = len(re.findall("(^| )-serial ", self.qemu_opt))
         if serial_num < 2:
             self.qemu_opt += " -serial null"