I've had success with configuring /dev/ttyS0 on the Galileo, but this morning I'm running into a strange issue:
root@clanton:~# echo -n "4" > /sys/class/gpio/export
root@clanton:~# echo -n "40" > /sys/class/gpio/export
-sh: echo: write error: No such device
root@clanton:~# echo -n "41" > /sys/class/gpio/export
-sh: echo: write error: No such device
root@clanton:~# ls -la /sys/class/gpio/
total 0
drwxr-xr-x 2 root root 0 Jan 1 2001 .
drwxr-xr-x 41 root root 0 Jan 1 2001 ..
--w------- 1 root root 4096 Feb 20 16:24 export
lrwxrwxrwx 1 root root 0 Feb 20 16:19 gpio4 -> ../../devices/pci0000:00/0000:00:1f.0/sch_gpio.2398/gpio/gpio4
lrwxrwxrwx 1 root root 0 Jan 1 2001 gpiochip0 -> ../../devices/pci0000:00/0000:00:1f.0/sch_gpio.2398/gpio/gpiochip0
lrwxrwxrwx 1 root root 0 Jan 1 2001 gpiochip2 -> ../../devices/pci0000:00/0000:00:1f.0/sch_gpio.2398/gpio/gpiochip2
lrwxrwxrwx 1 root root 0 Jan 1 2001 gpiochip8 -> ../../devices/virtual/gpio/gpiochip8
--w------- 1 root root 4096 Jan 1 2001 unexport
Any ideas?