Update: Now official OpenWrt support BeagleBone Black.
Follow steps shown on https://github.com/nc543/openwrt-bbb/wiki
To enable GPIO Support
make kernel_menuconfig
select Device Drivers -> GPIO Support -> /sys/class/gpio/... (sysfs interface)
make
Just replace the file /boot/zImage with bin/omap/*zImage, and reference http://wiki.openwrt.org/doc/hardware/port.gpio to setting GPIO.
References：
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