CP2102 UART adapter not attaching

[Hans Petter Selasky]

On 01/10/16 05:07, Mark Johnston wrote:
> Hi,
>
> I have the module listed here:
> http://www.amazon.com/KEDSUM%C2%AE-CP2102-Module-Download-Converter/dp/B009T2ZR6W
>
> Under Windows 8 it works perfectly, but on FreeBSD-CURRENT I get:
>
> usb_alloc_device: set address 3 failed (USB_ERR_STALLED, ignored)
> usbd_setup_device_desc: getting device descriptor at addr 3 failed, USB_ERR_STALLED
> usbd_req_re_enumerate: addr=3, set address failed! (USB_ERR_STALLED, ignored)
> usbd_setup_device_desc: getting device descriptor at addr 3 failed, USB_ERR_STALLED
> usbd_req_re_enumerate: addr=3, set address failed! (USB_ERR_STALLED, ignored)
> usbd_setup_device_desc: getting device descriptor at addr 3 failed, USB_ERR_STALLED
> usbd_req_re_enumerate: addr=3, set address failed! (USB_ERR_STALLED, ignored)
> usbd_setup_device_desc: getting device descriptor at addr 3 failed, USB_ERR_STALLED
> usbd_req_re_enumerate: addr=3, set address failed! (USB_ERR_STALLED, ignored)
> usbd_setup_device_desc: getting device descriptor at addr 3 failed, USB_ERR_STALLED
> ugen1.3: <Unknown> at usbus1 (disconnected)
> uhub_reattach_port: could not allocate new device
>
> It looks like this device should be handled by uslcom(4), but it looks
> like we can't even get the device descriptor. How can I go about
> debugging this?

Hi,

What does "usbconfig" say about your USB controllers?

Did you try to connect through an external USB HUB?

The log you show basically shows that the device is refusing to enumerate.

You can try adding "options USB_REQ_DEBUG" to GENERIC. Then you'll have 
some more sysctl knobs under hw.usb which allows you to try to figure 
out timing related issues.

Which version of FreeBSD are you using?

--HPS