On Fri, Dec 8, 2017 at 8:30 AM, Randall Spangler <[email protected]> wrote: > On Fri, Dec 8, 2017 at 5:57 AM, Аладышев Константин <[email protected]> > 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.
There are also schematics available for several misc. peripherals that use stm32 + cros_ec, see twinkie for example: https://www.chromium.org/chromium-os/twinkie Unfortunately there are no schematics for actual Chromebook mainboards publicly available. I looked into making some public, but there were some overriding concerns. > >> >> Best regards, >> Aladyshev Konstantin >> >> >> >> From: [email protected] [mailto:[email protected]] 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 <[email protected]> >> 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 <[email protected]> >> 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: [email protected] >> https://mail.coreboot.org/mailman/listinfo/coreboot >> >> >> > -- coreboot mailing list: [email protected] https://mail.coreboot.org/mailman/listinfo/coreboot
