Clean merge with master.

README.md

@@ -75,7 +75,7 @@ There are four phases to setting up the Pi:
    > Note: you don't need to uncompress the zip file you downloaded.
 
 ### Get a shell on the Pi
-If you have a monitor with an hdmi input, a mini hdmi to hdmi cable, a usb keyboard and a micro usb power cable you can hook up the devices to the Pi and configure it directly.
+If you have a monitor with an hdmi input, a mini hdmi to hdmi cable, a usb keyboard and a micro usb power cable you can hook up the devices to the Pi and configure it directly. Before you start those steps, ensure that the MicroSD card is in your computer and edit the cmdline.txt file to delete the parameter " init=/usr/lib/raspi-config/init_resize.sh".
 1. Insert the MicroSD card into the Pi.
 1. Connect the keyboard, and monitor to the Pi.
 1. Connect the power supply to the Pi using the port labeld "PWR" on the circuitboard.
@@ -158,3 +158,17 @@ If you set up the Pi with a keyboard and a monitor disconnect it and connect it
 1. Eject the drives.
 1. Unplug the Pi from the PC.
 1. Plug the Pi into your Tesla.
+
+## Making changes to the system after setup
+The setup process configures the Pi with read-only file systems for the operating system but with read-write access through the USB
+ interface. This means that you'll be able to record dashcam video and add and remove music files but you won't be able to make changes 
+ to files on / or on /boot. This is to protect against corruption of the operating system when the Tesla cuts power to the Pi.
+
+To make changes to the system partitions:
+```
+ssh pi@teslausb.
+sudo -i
+mount / -o remount,rw
+mount /boot -o remount,rw
+```
+Then make whatever changes you need to. The next time the system boots the partitions will once again be read-only.