runqemu-gen-tapdevs: Improve help text with an example

Figuring how the correct commandline isn't trivial, improve the help
text with RSS in mind.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/scripts/runqemu-gen-tapdevs b/scripts/runqemu-gen-tapdevs
index bfb60f44ae3421aa9499d80377559ebd494e9b43..9e5e5b98f0515c8be3d97ec641f0278e3e7007ae 100755 (executable)
--- a/scripts/runqemu-gen-tapdevs
+++ b/scripts/runqemu-gen-tapdevs
@@ -28,6 +28,8 @@ usage() {
        echo "Where <gid> is the numeric group id the tap devices will be owned by"
        echo "<num> is the number of tap devices to create (0 to remove all)"
        echo "<native-sysroot-basedir> is the path to the build system's native sysroot"
+       echo "e.g. $ bitbake qemu-helper-native -c addto_recipe_sysroot"
+       echo "$ sudo $0 1000 1000 4 tmp/work/x86_64-linux/qemu-helper-native/*/recipe-sysroot-native/"
        exit 1
 }