EDIT: see below, this only happens when running Firmata on the M4. I'm following the tutorial at http://www.udoo.org/docs-neo/Arduino_M4_Processor/Communication.html, programming the M4 with the on-device arduino IDE and using minicom to connect to /dev/ttyMCC. As soon as I start minicom, I get a kernel panic: Code: Kernel panic - not syncing: Aiee, killing interrupt handler! This is on a fully updated UDOObuntu, running kernel 02003-g19d1e35. Needless to say, without access to /dev/ttyMCC the M4 is pretty useless to me.