VT8500_URFCR
vt8500_write(&vt8500_port->uart, 0x880, VT8500_URFCR);
vt8500_write(&vt8500_port->uart, 0x88c, VT8500_URFCR);
while ((vt8500_read(&vt8500_port->uart, VT8500_URFCR) & 0xc)
vt8500_write(&vt8500_port->uart, 0x881, VT8500_URFCR);