On Fri, Dec 8, 2017 at 5:57 AM, Аладышев Константин <aladys...@nicevt.ru> wrote:
> Thanks for your answer! > > I've looked more closely at Chromium Embedded Controller project and EC > chips it supports. To my surprise 'chromeec' even supports ordinary STM32 > controllers without ACPI EC registers (am I right?). Yes, we've used it for everything from the main EC to a USB-PD controller to a charger. STM32 isn't suitable as the main EC for x86-based Chromebooks, of course, due to lack of eSPI / LPC. > So I think is it very important to do schematics as it is in Chromebooks > to make use of this project. > > Is there any chance to find schematics for Chromebook boards, to get > reference design of implementing ECs with ‘chromeec’ project? > I don't know. But it supports several STM32 discovery boards, so you can tinker with it on ready-built hardware. > Best regards, > Aladyshev Konstantin > > > > From: rspang...@google.com [mailto:rspang...@google.com] On Behalf Of > Randall Spangler > Sent: Friday, December 01, 2017 7:02 PM > To: Vadim Bendebury > Cc: Аладышев Константин; Coreboot; Shawn N > Subject: Re: [coreboot] Embedded Controller (EC) > > On Fri, Dec 1, 2017 at 6:32 AM, Vadim Bendebury <vben...@chromium.org> > wrote: > [+cc a couple of guys who might have some advice in this respect] > > On Fri, Dec 1, 2017 at 5:07 AM, Аладышев Константин <aladys...@nicevt.ru> > wrote: > Hello! I'm trying to understand, what is the easiest way today to integrate > EC to custom motherboard? What controller should I choose for new custom > motherboard? > > 1) First of all, are there any ECs on market that ship with embedded > firmware, where all you need to do is just a little bit of register > configuration (like SuperIO)? Or is it always like you need to write all > firmware by yourself? > > Most EC vendors that sell dedicated ECs also sell their SDK and source > code, but it's not cheap. So usually roll your own, hopefully based on an > open design. > > In that case what is the main difference between > ordinary microcontroller (for example STM32) and some controller marked by > vendor as EC? > > Interfaces. EC will have: > • Keyboard scanner > • eSPI / LPC for connecting to x86 SoC > • More I2C ports > (and in the old days, PECI and PS/2 ports). > > > 2) How stable and flexible are projects about open EC firmware? Is it > possible to adapt these projects for my custom motherboard? > > I'm talking about: > - Chromium Embedded Controller: > http://www.chromium.org/chromium-os/ec-development > > This is used on all current Chromebooks, so it's full-featured and > stable. We do tend to branch old boards, so if your motherboard has an old > chipset on it you may need to look back in time to find support for it. > > > - Origami-EC: https://git.code.paulk.fr/gitweb/?p=origami-ec.git;a=summary > > 3) What is the current status of EC support from coreboot point of view? > https://review.coreboot.org/cgit/coreboot.git/tree/src/ec > > Best regards, > Aladyshev Konstantin > > > -- > coreboot mailing list: coreboot@coreboot.org > https://mail.coreboot.org/mailman/listinfo/coreboot > > > >
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