Exploring the Embedded Controller

[kjhoerr]

@pierce

Might there be a good reason that ectool doesn’t work on the new AMD Ryzen based Framework laptops yet? I get “Unable to establish host communication” for every --interface option I try.

Yeah, The EC on the AMD board is different and uses a different branch of the ChromeOS EC, and the communication interface changed - @DHowett went into detail here:

What EC is used?

The Intel Framework Laptop 13s use a Microchip MEC1521, and the AMD ones (13" and 16") use a Nuvoton NPCX9. Intel The embedded controller firmware is based on an older version of the ChromeOS EC; this is what is in the default branch (hx20-hx30). It diverges heavily from the main branch, because main tracks ChromeOS upstream. Apart from the modifications to the core EC “OS”, all of the code is in baseboard/fwk and board/hx[23]0. AMD This one is based on the Zephyr port of the ChromeOS EC, a…