CM3: Update example dt-blobs for configuring the screen

#498

dt-blobs hadn't been updated for CM3 so failed to boot the
board.

Adds a blob for display and 1 camera - the one that was
called disp1-cam1 actually enabled 2 cameras.
disp1-cam2 enables display and both cameras.

Links to prebuilt blobs also updated to point at
github.com/raspberrypi/documentation, not
github.com/adam-lee/documentation

hardware/computemodule/cmio-display.md

@@ -3,6 +3,7 @@
 **This document is a work in progress and is intended for advanced users.**
 
 For the display to work with the Compute Module, the firmware needs to be October 23rd 2015 or newer (use `vcgencmd version` to check).
+To work with the Compute Module 3, the firmware needs to be from October 2016 or later.
 
 ## Quickstart - Display Only
 
@@ -16,49 +17,57 @@ For the display to work with the Compute Module, the firmware needs to be Octobe
 
 1. On the compute module, run:
 
-	```sudo wget https://goo.gl/Ah6XD5 -O /boot/dt-blob.bin```
+	```sudo wget https://goo.gl/iiVxuA -O /boot/dt-blob.bin```
 
 1. Reboot for the `dt-blob.bin` file to be read.
 
-## Quickstart - Display and Camera
-This will enable `disp1` and `cam1`.
+## Quickstart - Display and Camera(s)
+This will enable `disp1` and `cam1`, with optionally `cam0`.
 
 1. Connect the display to the DISP1 port on the Compute Module IO board through the 22W to 15W display adaptor.
 1. Connect the camera to the CAM1 port on the Compute Module IO board through the 22W to 15W camera adaptor.
+1. (Optional) Connect the camera to the CAM0 port on the Compute Module IO board through the 22W to 15W camera adaptor.
 1. Connect these pins together with jumper wires:
 
 	```
-	GPIO0 - CD0_SDA
-	GPIO1 - CD0_SCL
-	GPIO4 - CAM0_IO1
-	GPIO5 - CAM0_IO0
-
-	GPIO28 - CD1_SDA
-	GPIO29 - CD1_SCL
-	GPIO30 - CAM1_IO1
-	GPIO31 - CAM1_IO0
+	GPIO0 - CD1_SDA
+	GPIO1 - CD1_SCL
+	GPIO4 - CAM1_IO1
+	GPIO5 - CAM1_IO0
 	```
+Please note that the wiring is slightly different from that on the camera page in using GPIOs 4&5 instead of 2&3.
 
-	![GPIO connection for a single display and a single camera](images/CMIO-Cam-Disp-GPIO.jpg)
+1. For `cam0`, add links:
 
-1. On the compute module, run:
+	```
+	GPIO28 - CD0_SDA
+	GPIO29 - CD0_SCL
+	GPIO30 - CAM0_IO1
+	GPIO31 - CAM0_IO0
+	```
 
-	```sudo wget https://goo.gl/1V3ReK -O /boot/dt-blob.bin```
+	![GPIO connection for a single display and two cameras](images/CMIO-Cam-Disp-GPIO.jpg)
+	(Please note this image needs to be updated to show two cameras, or have the extra jumper leads removed)
 
-1. Make the 7" display as the default by adding the following line into `/boot/config.txt`:
+1. On the compute module, for display and one camera run:
+
+	```sudo wget https://goo.gl/gaqNrO -O /boot/dt-blob.bin```  
+
+  For display and two cameras run:
+
+	```sudo wget https://goo.gl/htHv7m -O /boot/dt-blob.bin```
 
-	```
-	display_default_lcd=1
-	```
 1. Reboot for the `dt-blob.bin` file to be read.
 
 	![Camera Preview on the 7 inch display](images/CMIO-Cam-Disp-Example.jpg)
+	(Please note this image needs to be updated to show two cameras, or have the extra jumper leads removed)
 
 ### Software support
 
 There is no additional configuration required to enable the touch screen. The touch interface should out work of the box once the screen is successfully detected.
 
 
 ### Sources
-- [dt-blob-disp1-cam1.dts](dt-blob-disp1-cam1.dts)
 - [dt-blob-disp1-only.dts](dt-blob-disp1-only.dts)
+- [dt-blob-disp1-cam1.dts](dt-blob-disp1-cam1.dts)
+- [dt-blob-disp1-cam2.dts](dt-blob-disp1-cam2.dts)