I've a cubieboard2 running arch linux with a custom linux kernel.
In the cubieboard2 I plugged in my usb-serial device (like an arduino), the device is recognized as CDC ACM. My linux kernel has the CDC options enabled in the configuration, as I saw in this page, but, I can't use the serial port
/dev/ttyACM0 using the applications
Minicom just says that it can't open the serial port. Pyserial is able to open the port, but when I try reading it the result is:
SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
pyserial if I try to write a byte the result is other:
SerialException: write failed: [Errno 5] Input/output error.
Other weird things happen when I close the serial port, it changes its name, in other words, when I close the
/dev/ttyACM0 it changes to
I've tried my device in my laptop and it works fine with both,
$ uname -a Linux alarm 3.4.61-rt77-ARCH+ #10 SMP PREEMPT RT Thu Apr 17 13:58:20 BRT 2014 armv7l GNU/Linux
my kernel config file: http://pastebin.com/raw.php?i=6LfsRyek
My guess is that it's missing having some kernel option enabled, but I don't know which.