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# Zephyr Proof-of-Concept-Device Bringup
It may be useful to build a Zephyr OS-based EC for a device which
already has a CrOS EC device build, for the purposes of demonstrating
the feasibility of Zephyr OS.
This document is a work-in-progress list of tricks & tools that may be
useful to you.
## Initial Bringup
Initially, you'll want to get a basic UART functioning with nothing
but a shell and some basic console commands.
An example CL to do this for Lazor can be found
[here](https://crrev.com/c/2749765).
## Bringing up GPIOs
After you have UART functioning, GPIOs can be an easy target to start
unblocking further features.
The resultant CL for Lazor can be found [here](https://crrev.com/c/2749768).
## Bring up Host Commands
Set `CONFIG_PLATFORM_EC_HOSTCMD=y` and enable the appropriate
host-command interface for your platform (e.g., eSPI).
An example CL for Lazor can be found [here](https://crrev.com/c/2749428).
As long as you get this compiling that should be enough to move to the
next step. Further testing of the host command layer will require
power sequencing up and going.
## Enabling some simple GPIO-based buttons and switches
Next, you can:
* [Add the lid switch](https://crrev.com/c/2749768)
* [Add the power button](https://crrev.com/c/2749426)
* [Add AC presence detection](https://crrev.com/c/2749428)
## Power Sequencing
TODO(jrosenth): add steps on enabling power sequencing and expand this
document.
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