USB2 PHY isn't working

[sergforce]

USB2 PHY isn't working on default stock image.

If your miniPCIe slot is routed to USB2 only the board won't be enumerated.
Only native PCI-e mode is working or our XTRX usb3-to-pcie adapter.

[mazsi-on-xtrx]

here is an example FPGA design for those who want to test / play with the USB2 interface:

https://github.com/mazsi-on-xtrx/xtrx-system-test/tree/v20190501

it implements a CDC ACM device (usb-to-serial converter), which is connected to the onboard GPS,
so you can immediately start receiving NMEA sentences, even in a usb-only minipcie slot,
or without a minipcie slot by hooking up the xtrx using its microusb connector.

however, it does not include the usual FPGA design blocks of the default stock image, so don't burn
the .bin file into the flash unless you know what you are doing: the test_xtrxflash would not work anymore.