fomu-factory-test/jig/README.md

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Install wiringpi to get the `gpio` command:
```
apt install wiringpi
```
There are five LEDs on the front. The indicate which subsystems work.
1: An error occurred
2: Test Error
3: Test Error
4: Test Error
5: Tester is IDLE (also, tester is READY)
LEDs 2, 3, and 4 form a pattern that indicate which test failed:
Test name | 2 (Green) | 3 (Blue) | 4 (White) | Reason for Failure |
====================+===========+===========+===========+====================+
SPI Valid | | x | x | The SPI flash was not found, or was not the correct model |
USB Communication | x | | | The FPGA isn't assembled correctly, the USB pullup isn't correct, or the crystal is bad |
Load Test Bitstream | | | | The FPGA isn't assembled correctly |
Test SPI | | x | | Not all four wires are connected between the FPGA and the SPI |
Test RGB | x | x | | TOUCH2 or the RGB LED are not assembled correctly |
Test Touch | | x | x | TOUCH1, TOUCH3, or TOUCH4 are not assembled correctly |
Final Bitstream | | | x | The final program could not be loaded |