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# Building Zephyr OS
[TOC]
Chromium OS EC uses the `zmake` tool to build Zephyr.
This section describes how to build and use zmake.
## Environment Setup
Follow the [Chromium OS Developer Guide] to sync the source and get
the chroot setup.
It is also possible to build without a Chromium OS chroot, albeit with
additional setup steps. See [out-of-chroot building] if this
interests you.
### A Note on Syncing the Source
The Legacy EC required only a single repository, and thus, it was common
for developers to sync just the EC repository using `repo sync .`.
Since the Zephyr build relies on multiple repositories, doing so will
likely end you up in a broken state. Please be sure to do a complete
sync when updating the source.
## Building
To build the EC for a single project, run:
``` shellsession
(chroot) $ zmake build "${PROJECT}"
```
For example, to build the EC for `skyrim`, run:
``` shellsession
(chroot) $ zmake build skyrim
```
The output binary will then be located at `build/zephyr/skyrim/output/zephyr.bin`.
Additional output files you may find useful:
* `build/zephyr/skyrim/output/zephyr.ro.elf` - read-only ELF for debugging
* `build/zephyr/skyrim/output/zephyr.rw.elf` - read-write ELF for debugging
You might also find these files useful (using read-only as an example):
* `build/zephyr/skyrim/build-ro/zephyr/.config` - Kconfig options selected
* `build/zephyr/skyrim/build-ro/zephyr/include/generated/devicetree_unfixed.h` - the (large)
header file that zephyr uses to provide devicetree information to the C code
* `build/zephyr/skyrim/build-ro/zephyr/zephyr.dts` - devicetree that is used
* `build/zephyr/skyrim/build-ro/zephyr/zephyr.dts` - map of image
For a complete list of `zmake` commands and options, see the
[Zmake Documentation].
Googlers may be interested in setting up [building with Goma](../goma.md)
as well.
### Building from Portage
There is also a [an ebuild] for integration into the larger Chromium
OS build system.
To build using this flow, run:
``` shellsession
(chroot) $ emerge-${BOARD} chromeos-base/chromeos-zephyr
```
### Looking at the Kconfig
It should be possible to do this with:
```bash
ninja -C /tmp/z/volteer/build-ro menuconfig
```
However at present this does not work [b/184662866](http://b/184662866).
[Chromium OS Developer Guide]: https://chromium.googlesource.com/chromiumos/docs/+/HEAD/developer_guide.md
[Zmake Documentation]: ../../zephyr/zmake/README.md
[an ebuild]: https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/HEAD/chromeos-base/chromeos-zephyr/chromeos-zephyr-9999.ebuild
[out-of-chroot building]: ./out_of_chroot.md
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