[Librem-5-dev] Difficulties with serial of USB

Angus Ainslie angus.ainslie at puri.sm
Thu Feb 7 07:00:36 PST 2019

On 2019-02-07 5:44 a.m., Jeremiah C. Foster via Librem-5-dev wrote:
> On Wed, 2019-02-06 at 14:31 -0800, Angus Ainslie via Librem-5-dev wrote:
>> Hi Jeremiah,
> Thanks for the reply Angus,
>> On 2019-02-06 1:33 p.m., Jeremiah C. Foster via Librem-5-dev wrote:
>>> Hi,
>>> My devkit shows up in dmesg;
>>> #  dmesg | grep cdc
>>> [10232.643261] cdc_acm 1-6.1:1.1: ttyACM0: USB ACM device
>>> [10232.647089] usbcore: registered new interface driver cdc_acm
>>> [10232.647095] cdc_acm: USB Abstract Control Model driver for USB
>>> modems and ISDN adapters
>>> [10245.873686] cdc_acm 1-6.1:1.1: failed to set dtr/rts
>>> But it disappears at some point because I cannot find it in /dev/ nor
>>> connect using picocom.
>>> When I reboot the device into another mode than emmc, it shows up as a
>>> USB HID which I imagine is the expected behavior. I'm working from
>>> here:
>>> https://developer.puri.sm/Librem5/Development_Environment/Boards/imx8.html#dev-board-figure
>>> I wonder if anyone else has seen this behavior?
>> Is this with the image the devkit originally shipped with or has it
>> been upgraded ?
> Yes, this is the original image.

I think you should reflash with the latest image as that has a number of
fixes including some that make ssh work better.

It looks like the laboratory image is working now but I haven't used
that one


There is also the buster based image



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