From 890158860bf1da309bfa8ec09ee74c5e8c101c22 Mon Sep 17 00:00:00 2001
From: Olaf Rempel <razzor@kopf-tisch.de>
Date: Sat, 1 Feb 2020 21:56:25 +0100
Subject: [PATCH] butterfly: document chip erase

---
 butterfly.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/butterfly.c b/butterfly.c
index 75cdfd5..f26b44f 100644
--- a/butterfly.c
+++ b/butterfly.c
@@ -106,7 +106,7 @@ static int bfly_optarg_cb(int val, const char *arg, void *privdata)
             }
             break;
 
-        case 'e': /* no verify after write */
+        case 'e': /* chip erase */
             p_priv->chip_erase = 1;
             break;
 
@@ -115,6 +115,7 @@ static int bfly_optarg_cb(int val, const char *arg, void *privdata)
             fprintf(stderr, "Usage: butterfly_prog [options]\n"
             "  -a <address>                 - optional: twi address for twiboot bridge mode\n"
             "  -d <device>                  - selects butterfly serial device\n"
+            "  -e                           - executes a chip erase\n"
             "  -r <flash|eeprom>:<file>     - reads flash/eeprom to file   (.bin | .hex | -)\n"
             "  -w <flash|eeprom>:<file>     - write flash/eeprom from file (.bin | .hex)\n"
             "  -n                           - disable verify after write\n"