tftp: more helpful help text

[Pavel Machek]

It took me a while to figure out syntax of tftp command, document that 
server address is taken from environment.

Signed-off-by: Pavel Machek <pavel at ucw.cz>

diff --git a/commands/tftp.c b/commands/tftp.c
index c066631..62b9424 100644
--- a/commands/tftp.c
+++ b/commands/tftp.c
@@ -92,7 +92,8 @@ err_free:
 }
 
 BAREBOX_CMD_HELP_START(tftp)
-BAREBOX_CMD_HELP_TEXT("Load (or save) a file via TFTP.")
+BAREBOX_CMD_HELP_TEXT("Load (or save) a file via TFTP. SOURCE is a path on server,")
+BAREBOX_CMD_HELP_TEXT("server address is taken from the environment (ethX.serverip).")
 BAREBOX_CMD_HELP_TEXT("")
 BAREBOX_CMD_HELP_TEXT("Options:")
 BAREBOX_CMD_HELP_OPT ("-p", "push to TFTP server")

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html