I am looking for a pci-express usb otg adapter (or some other way) so I can do some experimenting with gadgetfs (usb device) on my desktop Linux computer. usb type c is not suitable as it uses different drivers and has a different api.
I have seen a couple of older (ACIX MCS9990, IsP1362 Pci/Linux OtG evaluation kit ) boards around that used to support it, but I have not been able to find a source for these boards.
Any suggestions?