On Thu, Jul 10, 2014 at 8:44 AM, <sun19920...@gmail.com> wrote: > Hi, I always used beaglebone white before, and I bought a new BBB one week > ago. > I followed steps on https://eewiki.net/display/linuxonarm/BeagleBone+Black > to start with my BBB (so does Beaglebone white), > However, my computer cannot detect ttyUSB0 through USB socket, but LEDs on > BBB can blink. It seems microSD works. > I followed the steps on eewiki except "usb gadget", "HDMI", "eMMC", and > "SGX" parts. > > I also followed steps for beaglebone white on eewiki and that works. > (Debian, v3.8, my Ubuntu can detect ttyUSB0 correctly, so I guess that is > not problem of file system or kernel or my host PC.) > > I don't know what happened to my beaglebone black, I guess that the problem > comes from inittab or uEnv.txt, but I have no idea how to deal with it. (my > BBB is Rev.C). > > If I eject my microSD form BBB, my host PC can detect ttyACM0 (that is a > system on eMMC), but I have to use a recompiled kernel rather than Debian on > eMMC.
Your getting tricked by a little software trickery. On the original BeagleBone, there was an ftdi based usb-serial chip connected to the usb slave port to give your pc a raw "/dev/ttyUSB0" device. On the BeagleBone Black this was removed to save $'s.. However, there is a usb-serial gadget, so we get the kernel to create a usb-serial device (/dev/ttyACM0) in the default image. It's done here: https://github.com/RobertCNelson/boot-scripts/blob/master/boot/am335x_evm.sh#L76 That "usb gadget" section on my eewiki.net page would have enabled that usb-serial gadget too.. Regards, -- Robert Nelson http://www.rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
