It seems that default kernel on latest Udoo Neo software does not include necessary modules for communication with cheap rs232 to usb converters. This issue is mentioned in a few other posts, and seems solvable- I lack expertise in kernel driver installation (compilation?) http://www.udoo.org/forum/threads/need-help-with-usb-to-serial-rs-232-adapter.516/ http://www.udoo.org/forum/threads/solved-pl-2303-usb-serial-module-communication-problem.1558/ Solution is apparently: "I solved my problem. I built pl2303.ko and copy " /lib/modules/3.0.35/kernel/drivers/usb/serial" and run "sudo modprobe pl2303"" but even web archive of broken link doesn't provide specific help. " Hi, Built kernel and module following http://www.udoo.org/docs/Advanced_Setup/Compile_The_Linux_Kernel_And_The_Modules This worked well and easily. Some details for beginners: When editing menuconfig: go to: Device drivers > USB Support > USB serial converter support then find your device and select the module (USB Prolific 2303 in my case) Once kernel and modules compiled, install them on your SD card. (copy uImage to /boot/uImage on you card, and /lib content to your /lib on your card. I renamed my the original uImage and /lib/modules dir for backup) " Help! Thanks!! Code: dmesg: [ 1093.535695] usbcore: registered new interface driver usbserial [ 1093.536425] usbcore: registered new interface driver usbserial_generic [ 1093.536607] usbserial: USB Serial support registered for generic [ 1093.555645] usbcore: registered new interface driver ftdi_sio [ 1093.557509] usbserial: USB Serial support registered for FTDI USB Serial Device [ 1274.179866] usb 1-1.4: new full-speed USB device number 5 using ci_hdrc lsusb Bus 001 Device 008: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port Bus 001 Device 009: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port Bus 001 Device 006: ID 2109:2812 VIA Labs, Inc. VL812 Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub lsmod udooer@udooneo:~$ lsmod Module Size Used by ftdi_sio 31965 0 usbserial 25760 1 ftdi_sio cmac 2670 2 ipv6 296096 26 rfcomm 32463 8 bnep 10900 2 usb_f_acm 5204 1 u_serial 9688 3 usb_f_acm usb_f_rndis 15931 1 g_multi 4951 0 usb_f_mass_storage 44068 2 g_multi u_ether 12278 2 usb_f_rndis,g_multi libcomposite 35715 4 usb_f_acm,usb_f_rndis,g_multi,usb_f_mass_storage wl18xx 86282 0 wlcore 180035 1 wl18xx mac80211 407114 2 wl18xx,wlcore cfg80211 211480 3 mac80211,wl18xx,wlcore mxc_vadc 6519 1 mxc_dcic 6519 0 mx6s_capture 13372 0 fxos8700 11442 0 fxas2100x 7939 0 tsl2563 5797 0 mpl3115 3083 0 si70xx 3645 0 industrialio_triggered_buffer 1499 1 mpl3115 lm75 4736 0 hwmon 3635 2 lm75,si70xx wlcore_sdio 6710 0 ci_hdrc_imx 7536 0 usbmisc_imx 8816 1 ci_hdrc_imx ci_hdrc 30958 1 ci_hdrc_imx udc_core 8716 2 libcomposite,ci_hdrc ehci_hcd 43026 1 ci_hdrc usbcore 173703 4 usbserial,ehci_hcd,ftdi_sio,ci_hdrc usb_common 3308 4 udc_core,libcomposite,usbcore,ci_hdrc btwilink 4171 0 bluetooth 310254 22 bnep,rfcomm,btwilink rfkill 18057 5 cfg80211,bluetooth st_drv 18541 2 btwilink fuse 74400 0
Looks like it wil be implemented in the next Udoobuntu release: https://github.com/UDOOboard/linux_kernel/commit/724c68afab134fa9a12efaffbfc7085abdfc2e8d
