I have the LCD7 Cape installed and the RS232 Cape is plugged into that. When I plug the RS232 cape in and boot up the BBB, my LCD7 cape doesn’t display anything. I did a “dmesg | grep tty” via SSH and this was the result.
[ 0.000000] Kernel command line: console=ttyO0,115200n8 fixrtc root=/dev/mmcblk0p2 ro ro
[ 0.514174] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88) is a OMAP UART0
[ 1.225468] console [ttyO0] enabled
My understanding is that RS232 uses UART2 by default, so it’s not being detected and for some reason my LCD7 isn’t working either.