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

Angus Ainslie angus.ainslie at puri.sm
Wed Feb 6 14:31:33 PST 2019

Hi Jeremiah,

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 ? If it was upgraded do you know which version you upgraded to ?

Did you install a debug header so that we can see the console output ?
If not can you ssh to the devkit and get the logs from that side ?



> Cheers,
> Jeremiah
> > _______________________________________________ > Librem-5-dev
mailing list > Librem-5-dev at lists.community.puri.sm >
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