I would like to increase UART speed. So, I followed this page. http://www.thedevilonholiday.co.uk/raspberry-pi-increase-uart-speed/
I added init_uart_clock=64000000 and rebooted pi. But, still I got error message when I tried to change UART baud rate more than 115200 baud.
stty: /dev/ttyAMA0: unable to perform all requested operations
Further, on this page https://github.com/raspberrypi/linux/issues/105, popcornmix commented on Sep 7, 2012 that kernel has to be rebuilt for higher UART clock.
Could somebody please explain if higher UART clock is not easily attainable in PI 2?