UART input clock is platform dependent. Also account for possible
use of get_option() where baudrate is not compile-time constant.
The hardware reference on BeagleBone is from a 48 MHz oscillator input.
With pre-divisor of 16 we get same register values as in table 19-25.
Change-Id: I89aee27c958f8618ce79a968ae7520a867e7e8a2
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5290
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2cbcd2b710