Re: [chromium-dev] Ordering Servo v4 and Servo Micro boards made

[Mike Frysinger]

[ -> chromium-os-dev ]

you want the CrOS dev list rather than the browser list.  not that i know the answer to your question, but someone here should ;).

-mike

On Thu, Dec 5, 2019 at 4:39 PM Christopher Nugent <skymag...@gmail.com> wrote:

Good afternoon. My name is Chris Nugent. I've been a member of this list for some time, but have never posted until now.

I am interested in examining the firmware of and doing custom firmware development for my Chromebook.

I already know it uses the Servo header for this. Therefore, to proceed, I need a Servo board. How would I go about

having one made for me?  This would be my first time having a custom chip made.

Thank you for your time.

--Chris Nugent.

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[Vadim Bendebury (вб)]

Chris,

what particular Chromebook device do you have?

Chances are the servo header is not populated on it, but if it is a fairly recent device you should be able to access Closed Case Debug (aka CCD) features, which would allow you to reprogram the device firmware among other things.

-vb

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[Tom Hughes]

Chris,

Here's some more info on using CCD and SuzyQ: https://chromium.googlesource.com/chromiumos/third_party/hdctools/+/master/docs/ccd.md#suzyq-suzyqable

Here are the general servo docs: https://chromium.googlesource.com/chromiumos/third_party/hdctools/+/master/README.md

Tom

[Vadim Bendebury (вб)]

This is where you can get the debug cable: https://www.sparkfun.com/products/14746 it is backordered currently, but hopefully not for long. 

It will work provided your Chrome OS device has the Google security chip installed, You can check if this is the case by either examining chrome:://system/#cr50_version through the browser or /opt/google/cr50 through the linux command line. 

good luck!

-vb

On Mon, May 17, 2021 at 3:25 PM Infinbeatz <casm...@gmail.com> wrote:

I am also interested the firmware development for Chromebook. Mostly for debugging and testing. Was hoping someone could point me in the right direction. The servo v4 and similar debugging hardware. How would I go about acquiring one for our project?

[Infinbeatz]

I am also interested the firmware development for Chromebook. Mostly for debugging and testing. Was hoping someone could point me in the right direction. The servo v4 and similar debugging hardware. How would I go about acquiring one for our project?

On Wednesday, December 11, 2019 at 10:41:25 AM UTC-7 tomh...@chromium.org wrote:

[Łukasz Dobrowolski]

Hi!
Could somebody point me to/publish schematics of servo micro in a format that can be loaded into EDA program?

I've only found schematics in pdf. Board layout and BOM would be useful. My idea is to order PCB from pcbway and assemble it myself.

I could redraw the schematic from pdf in KiCad and make board layout but I'd rather not duplicate the work and risk making mistakes.

I'm most interested in the design form picture in the page section linked bellow as it looks cheapest to manufacture(I assume will fit Samsung Chromebook Plus ARM).
https://chromium.googlesource.com/chromiumos/third_party/hdctools/+/refs/heads/master/docs/servo_micro.md#flashing