> On 17 Feb 2022, at 19:50, Daniel Braniss <[email protected]> wrote:
>
>> If that is the case then the chip/driver are working fine since that
>> requires bidirectional communication etc..
>>
>
> but that works only if I power up the board while pressing a button, then it
> also appears as /dev/ttyU0, and
> so then I can flash, after reset, the device is gone and there are errors (
> BTW, the flashed image workes):
>
> Feb 17 09:46:59 pampero kernel: usbd_setup_device_desc: getting device
> descriptor at addr 4 failed, USB_ERR_IOERROR
> Feb 17 09:47:00 pampero kernel: usbd_req_re_enumerate: addr=4, set address
> failed! (USB_ERR_IOERROR, ignored)
What sort of dev board is it?
Seems very strange the USB UART would behave differently unless it's wired up
in an unusual way IMO.
--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
