QEMU fw_cfg device support in sysfs

modulename: qemu_fw_cfg.ko

configname: CONFIG_FW_CFG_SYSFS

Linux Kernel Configuration
└─>Device Drivers
└─>Firmware Drivers
└─>QEMU fw_cfg device support in sysfs
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Say Y or M here to enable the exporting of the QEMU firmware
configuration (fw_cfg) file entries via sysfs. Entries are
found under /sys/firmware/fw_cfg when this option is enabled
and loaded.

source code: