tty/serial: Need clarification on Support for 4+M Baudrate

[Alan Cox]

On Wed, 11 Jan 2012 17:49:01 +0530
> I have a requirement to interface UART with an external microcontroller 
> using baud rate above 4Mbps, hence following is my approach to apply
> the changes. Can any one review/provide me appropriate approach.

See TCGETS2/TCSETS2 and the BOTHER flag.

The kernel supports aetting arbitary baud rates already.

Alan