scripts: mkbootimg_rpi3.sh: replace waiting with sync command

The waiting with sleep command is not really required if there is
sync command before umount. Replace the waiting with sync command.

Change-Id: I97f886b9230aaafe20fc86caa2476d26c8464cde
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>

diff --git a/scripts/mkbootimg_rpi3.sh b/scripts/mkbootimg_rpi3.sh
index 4cc2a9c..f063185 100755 (executable)
--- a/scripts/mkbootimg_rpi3.sh
+++ b/scripts/mkbootimg_rpi3.sh
@@ -27,7 +27,7 @@ popd
 cp -a ${TMP_UBOOT_PATH}/boot/* ./tmp
 rm -rf ${TMP_UBOOT_PATH}
 
-sleep 1
+sync
 
 sudo umount tmp
 rm -rf tmp