I've been playing around with my BBB for about a month now and got everything up and running. Today I spent the whole day to get UART loopback to work on Debian. It simply doesn't work! Tried with Qt (cross-compiled and all samples are working), QSerialPortInfo::availablePorts().count() returns zero. At first I thought it can be a QtSerialPort issue. So I did a loop back on UART1 and UART2 (P9.21 connected to P9.26 and P9.22 connected to P9.24). Then opened "minicom -b 9600 -D /dev/ttyO1" and "minicom -b 9600 -D /dev/ttyO2" in two separate terminals. I expected to see whatever I type in each one of the terminals on the other one. But that wasn't the case. Nothing happens! Any idea what's wrong?
Here's some info about my setup: *Fresh install of "BBB-eMMC-flasher-debian-7.7-console-armhf-2014-10-29-2gb.img.xz". Didn't modify anything. * *"uname -a": * Linux arm 3.14.22-ti-r31 #1 SMP PREEMPT Fri Oct 24 20:50:46 UTC 2014 armv7l GNU/Linux *"dmesg | grep ttyO":* [ 0.000000] Kernel command line: console=ttyO0,115200n8 root=UUID=a52b5fd5-953d-458c-94d0-0cf2ff1c7115 ro rootfstype=ext4 rootwait fixrtc quiet init=/lib/systemd/systemd [ 2.799292] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88, base_baud = 3000000) is a OMAP UART0 [ 2.800424] console [ttyO0] enabled [ 2.802247] 48022000.serial: ttyO1 at MMIO 0x48022000 (irq = 89, base_baud = 3000000) is a OMAP UART1 [ 2.803710] 48024000.serial: ttyO2 at MMIO 0x48024000 (irq = 90, base_baud = 3000000) is a OMAP UART2 [ 2.805198] 481a8000.serial: ttyO4 at MMIO 0x481a8000 (irq = 61, base_baud = 3000000) is a OMAP UART4 [ 2.806622] 481aa000.serial: ttyO5 at MMIO 0x481aa000 (irq = 62, base_baud = 3000000) is a OMAP UART5 *"ls -al /dev/ttyO*":* crw-rw---- 1 root tty 249, 0 Oct 29 19:06 /dev/ttyO0 crw-rw---T 1 root dialout 249, 1 Nov 14 17:41 /dev/ttyO1 crw-rw---T 1 root dialout 249, 2 Nov 14 17:41 /dev/ttyO2 crw-rw---T 1 root dialout 249, 4 Jan 1 2000 /dev/ttyO4 crw-rw---T 1 root dialout 249, 5 Jan 1 2000 /dev/ttyO5 I appreciate anything that might help! :) -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
