Raw HDLC Ethernet device support

modulename: hdlc_raw_eth.ko

configname: CONFIG_HDLC_RAW_ETH

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wan interfaces support
└─>Raw HDLC Ethernet device support
In linux kernel since version 2.6.12  
Generic HDLC driver supporting raw HDLC Ethernet device emulation
over WAN connections.

You will need it for Ethernet over HDLC bridges.

If unsure, say N.

source code: