On Fri, 2014-02-14 at 23:46 +0000, Gordan Bobic wrote: > I'm trying to get qcontrol / ttyS1 to work with the default QNAP kernel > and I just cannot seem to get it to do anything. I think the stock QNAP kernel has a built in driver for the PIC controller, which I expect means that the device is effectively opened internally and can't be used from userspace via /dev/ttyS1. The Debian supplied kernel works fine with qcontrol etc. Ian.