Setup

The setup consists of one ECP5 Versa evaluation board plugged into the PCIe slot of a ROCKPro64.

A second computer to program on and conduct the tests is required.

Versa configuration

Set SW4 to 1: Down, 2: Up, 3: Down, 4: Down
Connect pins 2-4 and 5-6 on J50
Run openocd -f ispCLOCK/ispCLOCK-200MHz.cfg
Connect pins 1-2 and 3-5 on J50
Connect 2-4 and 3-5 on J4 (Connects the PRSNT signals on the PCIe connector and sets the ispCLOCK to PCIe clock input)

Get an SD card and connect it to your computer
Download this and this
Execute dd if=mmc_idbloader.img of=/dev/your_sd_card seek=64 status=progress
Execute dd if=mmc_u-boot.itb of=/dev/your_sd_card seek=16384 status=progress
Execute sync
Remove the SD card and plug it into the ROCKPro64
Plug the Versa into the ROCKPro64, connect a 12 V adapter to the ROCKPro64 but not to the Versa and do not power it yet, connect a USB cable from the Versa to your computer
Connect a UART configured to 3.3 V (for example a CH340) to the ROCKPro64, GND to pin 6 on the PI-2-bus, RX to pin 8, an unconnected cable to pin 10
Open a serial terminal
Power the 12 V adapter and watch the terminal
As soon as you can see it booting on the terminal, connect the unconnected cable from pin 10 to TX on the UART
As soon as it says that it is going to start the OS, press some key on the terminal to abort it, such that it goes to u-boot
Now there should be a prompt showing =>
Execute python test_pcie_phy.py run or python test_pcie_ltssm.py run from the Tests folder and wait until it is uploaded (sometimes the timing doesn't pass and you need to repeat it)
Execute pci enum on the ROCKPro64. Sometimes it says Link down, then you need to repeat and it should say PCIE-0: Link up (Bus0) and immediately crash / reboot
Press some key again to abort booting and you can try again

You can re-upload the last compiled gateware by executing

For more information read Physical Tests

On X3:4 is a clock output of the RX clock and on X4:28 for TX.