FXO/FXS cape driver for BeagleBone board FXX_DRV_VER 0.1 AM335 interface functions: int ioctrl_init(void) int ioctrl_cleanup(void) uint32_t *ioctrl_remap(uint32_t *addr_ptr, size_t block_len) int ioctrl_unmap(uint32_t *addr_pt