Serial connection error (Ubuntu 14.04 LTS)

[Boken Lin]

@Enrico-Bermudez Are you on 64 bit or 32 bit? If my compilation works I can send you the .ko file.

[Enrico Bermudez]

@Boken-Lin, I'm on a 64-bit machine. (x86_64)

[Boken Lin]

@Enrico-Bermudez Ok, here it is: https://s3-us-west-2.amazonaws.com/onion-cdn/community/openwrt/cp210x_driver.tar.gz.

Try the following:

1. Untar
2. copy usbserial.ko to /lib/modules/3.13.0-68-generic/kernel/drivers/usb/serial/
3. copy cp210x.ko to that folder as well
4. insmod /lib/modules/3.13.0-68-generic/kernel/drivers/usb/serial/usbserial.ko
5. insmod cp210x.ko

The above procedure worked for me on Ubuntu 14.04 x64.

Cheers.

[Enrico Bermudez]

@Boken-Lin You're at 3.13.0-68-generic, while I'm at 3.13.0-53-generic.

Not sure if the slight change in kernel version will be an issue. But I tried it anyway.

I still got the 'Invalid module format' error.

Let me see if I can update the kernel to the same version and try again.

And if that doesn't work, I may end up upgrading to 15.10.

[Boken Lin]

@Enrico-Bermudez Ok. I wasn't able to get kernel version 3.13.0-53 anymore. I was only able to find the Ubuntu image with the updated kernel. I think you might need to perform apt-get dist-upgrade to upgrade the kernel.

[Enrico Bermudez]

@Boken-Lin , Kernel upgrade didn't go up to 3.13.0-68-generic for some reason.
I can only bring it up to 3.13.0-55-generic. insmod seemed to work, but the connection still isn't working.

After all those failed attempts, I decided to upgrade to the latest long-term supported kernel 4.1.13. I used the instructions shown at:
http://linuxg.net/install-kernel-4-1-x-on-ubuntu/

Then followed the instruction for installing the cp210x driver.

And the serial connection works now!

[Boken Lin]

@Enrico-Bermudez Yay! That's great news!

[Enrico Bermudez]

Thanks for all your help, @Bokin! I learned a lot just going through this process with you.

[Boken Lin]

@Enrico-Bermudez No problem! That's what we are here for It's a learning experience for us as well. We'll know what to do to help people through similar issues!

[Christiaan Scholtz]

fyi I had the same problem on a fresh install of ubuntu 14, no USB devices listed. But after some time when i tried again it simply worked by itself.