tree 9633d88ca281c99ac465732610fdc5f439e62eb0
parent b0a487a4eb6c1e2214022f927cb3229f2323db44
author Simon Glass <sjg@chromium.org> 1456206937 -0700
committer Tom Rini <trini@konsulko.com> 1457979551 -0400

mkimage: Show an error message when usage() is called

Sometimes incorrect arguments are supplied but the reason is not obvious to
the user. Add some helpful messages.

Signed-off-by: Simon Glass <sjg@chromium.org>