UART (H4) protocol support

configname: CONFIG_BT_HCIUART_H4

Linux Kernel Configuration
└─>Networking support
└─>Bluetooth subsystem support
└─>Bluetooth device drivers
└─>UART (H4) protocol support
In linux kernel since version 2.6.12 )
UART (H4) is serial protocol for communication between Bluetooth
device and host. This protocol is required for most Bluetooth devices
with UART interface, including PCMCIA and CF cards.

Say Y here to compile support for HCI UART (H4) protocol.