Ethernet Control Model (CDC ECM) subset
configname: CONFIG_USB_CONFIGFS_ECM_SUBSET
USB Gadget Drivers
└─>Ethernet Control Model (CDC ECM) subset
In linux kernel since version 3.11 (release Date: 2013-09-02)
On hardware that can't implement the full protocol,
a simple CDC subset is used, placing fewer demands on USB.
a simple CDC subset is used, placing fewer demands on USB.