Dr. H. Nikolaus Schaller wrote: >>>> cu -l /dev/ttyACM0 >>>> GTA01Bv3 # nand erase rootfs > Many thanks for your suggestions, > but MacOS X has no cu command :-( You can use "minicom" from the Darwin Ports collection. I've added a section on the Wiki: http://wiki.openmoko.org/wiki/MacOS_X#USB_Serial