Update RaspberryPi.md

openocd/RaspberryPi.md

@@ -41,8 +41,13 @@ make
 sudo make install
 ```
 
-6. Get a bootloader.  Adafruit's is nice.
-7. Write openocd.cfg.
-8. sudo openocd
+6. Back up the sd card!  If you corrupt the card, you can skip steps 1-5 if you have a backup.
+```
+sudo dd if=/dev/diskn of=~/SDCardBackup.dmg
+```
+
+7. Get a bootloader.  Adafruit's is nice.
+8. Write openocd.cfg.
+9. sudo openocd