> what kind of UHCI controller chip exactly pegasos2 have ?

The Peg2's UHCI controller is not a dedicated chip but is inside the Via VT8231 southbridge chip.

> The Peg2's UHCI controller is not a dedicated chip but is inside the Via VT8231 southbridge chip.

Checked in OF via the "cd /pci/usb" and then ".properties", saying not VT8231, but VT83C572.

I can check it at home.
But Pegasos2 have Via VT8231 southbridge with 4port (2x2) USB 1.1
and Via VT83C572 is PCI to USB controller with (probably) 2port USB1.1
Cannot be VT83C572 part or subset of VT8231?

Now I see, it can be caused by identical DeviceID (3038h) of VT83C572 and USB controller of VT8231.

>> ".properties", saying not VT8231, but VT83C572

> Cannot be VT83C572 part or subset of VT8231?

Yes, I think that the VT83C572 is the UHCI controller contained in the VT8231 southbridge chip. The VT83C572 is available as both a dedicated chip, a controller inside UHCI/EHCI USB2 chips (like VT6202) and a controller inside multi-function chips (like VT8231 southbridge).