tree 629130fad3e6b0b731429bb90dc8e285a91ea8ab
parent 995f755ff569cbf6ed8d4eec5920b41628aa8ac9
author Paul Kocialkowski <contact@paulk.fr> 1515967666 +0300
committer Nico Huber <nico.h@gmx.de> 1518368014 +0000

Add support for the ENE Embedded Debug Interface EDI and KB9012 EC

The ENE Embedded Debug Interface (EDI) is a SPI-based interface for
accessing the memory of ENE embedded controllers.

The ENE KB9012 EC is an embedded controller found on various laptops
such as the Lenovo G505s. It features a 8051 microcontroller and
has 128 KiB of internal storage for program data.

EDI can be accessed on the KB9012 through pins 59-62 (CS-CLK-MOSI-MISO)
when flash direct access is not in use. Some firmwares disable EDI at runtime
so it might be necessary to ground pin 42 to reset the 8051 microcontroller
before accessing the KB9012 via EDI.

The example of flashing KB9012 at Lenovo G505S laptop could be found here:
http://dangerousprototypes.com/docs/Flashing_KB9012_with_Bus_Pirate

Change-Id: Ib8b2eb2feeef5c337d725d15ebf994a299897854
Signed-off-by: Mike Banon <mikebdp2@gmail.com>
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-on: https://review.coreboot.org/23259
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>