Section 4 of the manual describes special files (devices).

Page 4

fdc
PC architecture floppy disk controller driver
fdt
Flattened Device Tree support
fdt_pinctrl
FDT I/O pin multiplexing support
fdtbus
Flattened Device Tree bus driver
fe
Fujitsu MB86960A/MB86965A based Ethernet adapters
ffclock
FFCLOCK — Feed-forward system clock
fglrx
proprietary ATI RADEON and FireGL display driver
filemon
the filemon device
firewire
IEEE1394 High-performance Serial Bus
full
always full device
full
the full device
fuse
Filesystem in Userspace (FUSE) device
fwe
Ethernet emulation driver for FireWire
fwip
IP over FireWire driver
fwohci
OHCI FireWire chipset device driver
fxp
Intel EtherExpress PRO/100 Ethernet device driver
gbde
Geom Based Disk Encryption
gdb
external kernel debugger
gem
ERI/GEM/GMAC Ethernet device driver
geom
GEOM — modular disk I/O request transformation framework
geom_fox
GEOM based basic disk multipathing
geom_linux_lvm
GEOM based Linux LVM logical volume mapping
geom_map
GEOM module that maps defined items as separate partitions
geom_uzip
GEOM based compressed disk images and partitions
gif
generic tunnel interface
glide
Glide video driver
glxiic
Geode LX CS5536 I2C controller driver
glxsb
Geode LX Security Block crypto accelerator
gpio
gpiobus — GPIO bus system
gpiobus
GPIO bus system
gpioiic
GPIO I2C bit-banging device driver
gpiokeys
GPIO keys device driver
gpioled
GPIO LED generic device driver
gpioths
driver for DHTxx and AM320x temperature and humidity sensors
gre
encapsulating network device
h_ertt
Enhanced Round Trip Time Khelp module
hd
MFM/IDE hard disk devices
hifn
Hifn 7751/7951/7811/7955/7956 crypto accelerator
hme
Sun Microelectronics STP2002-STQ Ethernet interfaces device driver
hpet
High Precision Event Timer driver
hpsa
HP Smart Array SCSI driver
hpt27xx
HighPoint RocketRAID 27xx SAS 6Gb/s HBA card driver
hptiop
HighPoint RocketRAID 3xxx/4xxx device driver
hptmv
HighPoint RocketRAID 182x device driver
hptnr
HighPoint DC Series Data Center HBA card driver
hptrr
HighPoint RocketRAID device driver
hv_kvp
Hyper-V Key Value Pair Driver
hv_netvsc
Hyper-V Network Virtual Service Consumer
hv_storvsc
Hyper-V Storage Virtual Service Consumer
hv_utils
Hyper-V Utilities Driver
hv_vmbus
Hyper-V Virtual Machine Bus (VMBus) Driver
hv_vss
Hyper-V Volume Shadow Copy Service API
hwpmc
Hardware Performance Monitoring Counter support
i8254
attimer — i8254 Programmable Interval Timer (AT Timer) driver
iavf
Intel Adaptive Virtual Function driver
ichsmb
Intel ICH SMBus controller driver
ichwd
device driver for the Intel ICH watchdog interrupt timer
icmp
Internet Control Message Protocol
icmp6
Internet Control Message Protocol for IPv6
ida
Compaq Intelligent Drive Array Controllers
ieee1394
firewire — IEEE1394 High-performance Serial Bus
if_ae
ae — Attansic/Atheros L2 FastEthernet controller driver
if_age
age — Attansic/Atheros L1 Gigabit Ethernet driver
if_alc
alc — Atheros AR813x/AR815x/AR816x/AR817x Gigabit/Fast Ethernet driver
if_ale
ale — Atheros AR8121/AR8113/AR8114 Gigabit/Fast Ethernet driver
if_an
an — Aironet Communications 4500/4800 wireless network adapter driver
if_ath
ath — Atheros IEEE 802.11 wireless network driver
if_ath_pci
ath_pci — Atheros PCI device glue
if_aue
aue — ADMtek AN986 Pegasus USB Ethernet driver
if_axe
axe — ASIX Electronics AX88x7x/760 USB Ethernet driver
if_bce
bce — QLogic NetXtreme II (BCM5706/5708/5709/5716) PCI/PCIe Gigabit Ethernet adapter driver
if_bfe
bfe — Broadcom BCM4401 Ethernet Device Driver
if_bge
bge — Broadcom BCM57xx/BCM590x Gigabit/Fast Ethernet driver
if_bnxt
bnxt — Broadcom NetXtreme-C/NetXtreme-E Family Ethernet driver
if_bridge
network bridge device
if_bwi
bwi — Broadcom BCM43xx IEEE 802.11b/g wireless network driver
if_bwn
bwn — Broadcom BCM43xx SoftMAC IEEE 802.11 wireless network driver
if_bxe
bxe — QLogic NetXtreme II Ethernet 10Gb PCIe adapter driver
if_cas
cas — Sun Cassini/Cassini+ and National Semiconductor DP83065 Saturn Gigabit Ethernet driver
if_cc
cxgbe — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet adapter driver
if_ccv
cxgbev — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet VF driver
if_cdce
cdce — USB Communication Device Class Ethernet (CDC ECM/NCM) driver
if_cue
cue — CATC USB-EL1210A USB Ethernet driver
if_cxgb
cxgb — Chelsio T3 10 Gigabit Ethernet adapter driver
if_cxgbe
cxgbe — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet adapter driver
if_cxgbev
cxgbev — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet VF driver
if_cxl
cxgbe — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet adapter driver
if_cxlv
cxgbev — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet VF driver
if_dc
dc — DEC/Intel 21143 and clone 10/100 Ethernet driver
if_de
de — DEC DC21x4x Ethernet device driver
if_disc
disc — software discard network interface
if_ed
ed — NE-2000 and WD-80x3 Ethernet driver
if_edsc
edsc — Ethernet discard network interface
if_em
em — Intel(R) PRO/1000 Gigabit Ethernet adapter driver
if_enc
enc — Encapsulating Interface
if_epair
epair — A pair of virtual back-to-back connected Ethernet interfaces
if_et
et — Agere ET1310 10/100/Gigabit Ethernet driver
if_fwe
fwe — Ethernet emulation driver for FireWire
if_fwip
fwip — IP over FireWire driver
if_fxp
fxp — Intel EtherExpress PRO/100 Ethernet device driver