tree cfc4bf09d45d4ad59b645c0cadaec9507ba5c152
parent 25fde40f8594b1c13ba7a4c3a605b96b200a4e11
author Shawn Anastasio <shawnanastasio@yahoo.com> 1514701035 -0600
committer Nico Huber <nico.h@gmx.de> 1516980190 +0000

buspirate_spi: Add support for variable serial speeds

This patch sets the default baud rate for communication between
the host device and the Bus Pirate for hardware versions 3.0
and greater to 2M baud.

It also introduces the ability to manually set the baud rate via
the added 'serialspeed' programmer parameter.

This is done in two parts. Firstly, the requested serial speed is looked up
in a table to determine the appropriate clock divisor and the divisor is sent
to the bus pirate. Then, the system's baud rate for the selected serial port
is set using serial.c's 'serialport_config'. This function's prototype had to
be added to programmer.h.

In testing, using the 2M baud rate was able to significantly decrease
flash times (down from 20+ minutes to less than 2 minutes for an 8MB flash).

Change-Id: I3706f17a94fdf056063f2ad4a5f0a219665cdcbf
Signed-off-by: Shawn Anastasio <shawnanastasio@yahoo.com>
Reviewed-on: https://review.coreboot.org/23057
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>