# Fedora for the Lenovo Yoga C630 13Q50

Builds a ready-to-write Fedora aarch64 disk image for the Lenovo Yoga C630
(model 81JL, Qualcomm SDM850), using Gitea Actions.

The approach is borrowed from [aarch64-laptops/build][aal], but the heavy
lifting that project had to do in 2019 is now unnecessary: mainline Linux has
carried `sdm850-lenovo-yoga-c630.dts` since 5.5, and Fedora ships it in
`kernel-core`. There is no kernel to patch and no GRUB to compile. What is left
is assembling a disk image that boots on hardware whose firmware hands Linux no
device tree.

[aal]: https://github.com/aarch64-laptops/build

## What you get

`output/fedora-44-<variant>-lenovo-yoga-c630-<date>-<ref>.img.zst` — a GPT disk
image with an ESP, a `/boot` partition and an ext4 root. Decompress, write it to
a USB stick or microSD card, and boot. The root filesystem grows to fill the
medium on first boot.

Two variants:

| Variant       | Size  | Contents                                     |
|---------------|-------|----------------------------------------------|
| `minimal`     | 8 GiB | Console, sshd, and enough tools to debug the machine |
| `workstation` | 16 GiB| GNOME desktop                                |

Default login is `fedora` / `fedora`, and the password must be changed at first
login. Root is locked.

## Hardware status

| Works out of the box            | Needs firmware from Windows | Not supported |
|---------------------------------|-----------------------------|---------------|
| UFS storage, USB, keyboard, touchpad, touchscreen | Audio | LTE modem |
| WiFi + Bluetooth (ath10k WCN3990) | Sensor hub — lid switch, accelerometer, auto-rotate | |
| Graphics (freedreno, Adreno 630) | Hardware video decode (venus) | |
| Battery and charging            | | |

Qualcomm allows the Adreno and ath10k firmware to be redistributed, so Fedora
ships it and this image includes it. The SDM850 DSP and display blobs are signed
per model and exist only in your machine's Windows partition. Run
`sudo c630-firmware` once after installing — see [docs/firmware.md](docs/firmware.md).

## Building

CI does this on every push to `main`. To run it yourself:

```sh
./build/build-image.sh --variant minimal
```

You need `podman` and, on an x86_64 host, aarch64 emulation:

```sh
sudo dnf install -y qemu-user-static-aarch64
sudo systemctl restart systemd-binfmt
```

`build/build-image.sh` runs on the host and only sets up the container.
`build/stage2.sh` runs inside an aarch64 Fedora container and does everything
else: `dnf --installroot`, the overlay, dracut, and the disk assembly. It builds
filesystems from directory trees with `mke2fs -d` and `mcopy` rather than
mounting loop devices, so it does not need `/dev/loop-control` — which CI
runners generally will not hand out.

## Repository layout

```
config/device.env            C630 parameters: DTB path, kernel command line, geometry
config/packages/*.pkgs       Package lists — base plus one file per variant
overlay/                     Files copied into the root filesystem (*.in are templated)
build/build-image.sh         Host driver: emulation checks, podman invocation
build/stage2.sh              The actual build, inside an aarch64 container
firmware/local/              Optional drop-in for firmware you extracted yourself (gitignored)
.gitea/workflows/            CI
docs/                        Installation, firmware, runner setup
```

## Documentation

- [docs/install.md](docs/install.md) — writing the image and booting the laptop
- [docs/firmware.md](docs/firmware.md) — what needs extracting from Windows and why
- [docs/runner-setup.md](docs/runner-setup.md) — one-time Gitea runner preparation

## Caveats

The build has not yet been confirmed to boot on real hardware. The device tree,
kernel command line and firmware layout are taken from Fedora's Snapdragon WoA
documentation and the aarch64-laptops project; the parts specific to the C630's
older SDM850 are reasoned from those rather than tested. Expect to spend a boot
or two adjusting `DEVICE_CMDLINE` in `config/device.env`. Findings belong in
this README.