ehci_disown - Olimex ARM A20 Lime & USB FTDI RS-485 shuts down USB port

[Jared McNeill]

On Wed, 11 May 2016, Hans Petter Selasky wrote:

> ehci_disown() means that there should be a full speed controller that should 
> handle the device, because it is not high-speed. Does your board have 
> OHCI/UHCI or only EHCI? How are the USB parts wired. Is there a High-Speed TT 
> (USB HUB chip) connected to the EHCI port?

The A20 SoC has an OHCI controller but the ALLWINNER kernel is missing the 
ohci driver. There is a patch for review here: https://reviews.freebsd.org/D5481

Cheers,
Jared