Figure out why serial number reading in the FX2 firmware isn't working on the Opsis

[mithro]

From @mithro on June 8, 2016 7:49

Currently when loading the FX2 firmware on Opsis we are still getting the "fallback" serial number reported in the USB information.

[1905564.963987] usb 3-4.3: New USB device found, idVendor=2a19, idProduct=5442
[1905564.963992] usb 3-4.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[1905564.963995] usb 3-4.3: Product: HDMI2USB.tv - Numato Opsis Board
[1905564.963998] usb 3-4.3: Manufacturer: TimVideos.us
[1905564.964000] usb 3-4.3: SerialNumber: 0123456789abcdef

It is working on the shipping firmware;

[1905693.473306] usb 3-4.3: New USB device found, idVendor=2a19, idProduct=5442
[1905693.473310] usb 3-4.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[1905693.473313] usb 3-4.3: Product: HDMI2USB.tv - Numato Opsis Board
[1905693.473315] usb 3-4.3: Manufacturer: TimVideos.us
[1905693.473317] usb 3-4.3: SerialNumber: ffffd8803956c79a
[1905693.492402] uvcvideo: Found UVC 1.00 device HDMI2USB.tv - Numato Opsis Board (2a19:5442)
[1905693.493315] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround.
[1905693.494804] cdc_acm 3-4.3:1.2: ttyACM0: USB ACM device

JTAG mode is also working;

[1905520.002403] usb 3-4.3: New USB device found, idVendor=16c0, idProduct=06ad
[1905520.002408] usb 3-4.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[1905520.002412] usb 3-4.3: Product: Opsis (JTAG Mode)
[1905520.002428] usb 3-4.3: Manufacturer: Numato
[1905520.002430] usb 3-4.3: SerialNumber: ffffd8803956c79a

Copied from original issue: timvideos/HDMI2USB-litex-firmware#264

[paddatrapper]

Loading the firmware onto a FX2 dev board results in

SerialNumber: 0000000000000000

which may be related

[mithro]

The FX2 dev board doesn't have an I2C EEPROM with a MAC address in it, so that is going to work on that...

[paddatrapper]

Building with BOARD=atlys gives a serial of

SerialNumber: 0123456789abcdef

The FX2 dev board seems to have the same chip as what is in the Atlys board, not the opsis, so building should be done as if for the Atlys boards