rob thijssen
280874f564
Assembles a ready-to-write disk image via Gitea Actions. Mainline has carried sdm850-lenovo-yoga-c630.dts since 5.5 and Fedora ships it in kernel-core, so unlike aarch64-laptops/build there is no kernel or GRUB to compile — what is left is producing an image that boots on firmware which hands Linux no device tree. The build runs in an aarch64 container under qemu-user and builds filesystems from directory trees with mke2fs -d and mcopy rather than mounting loop devices, so it works on runners that will not hand out /dev/loop-control. A kernel-install hook writes the devicetree line into each BLS entry; without it the first `dnf update kernel` would produce an unbootable system. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01XWRjNJMistCy6ngXH5aJLS
2.9 KiB
Firmware
The C630's firmware splits into two groups, and the split is about licensing, not difficulty.
What ships in the image
Qualcomm permits redistribution of these, so Fedora packages them and the build installs them:
| Package | Files | Enables |
|---|---|---|
qcom-firmware |
qcom/a630_gmu.bin, qcom/a630_sqe.fw, qcom/sdm845/a630_zap.mbn |
Adreno 630 — accelerated graphics via freedreno |
atheros-firmware |
ath10k/WCN3990/hw1.0/{firmware-5.bin,board-2.bin,wlanmdsp.mbn} |
WiFi and Bluetooth |
So graphics and networking work on a freshly written image with no extra steps.
What has to come off the Windows partition
The SDM850's DSP and display firmware is signed against per-model keys. Nobody can redistribute it, and it exists on your machine only inside its Windows install:
| File | Enables |
|---|---|
qcadsp850.mbn |
Audio DSP — speakers, microphone |
qccdsp850.mbn |
Compute DSP — sensor hub, so lid switch, accelerometer, auto-rotate |
qcdxkmsuc850.mbn |
Display/UEFI secure code |
qcdsp1v2850.mbn, qcdsp2850.mbn |
Modem DSP stages |
ipa_fws.elf |
IPA — needed by the modem path |
They belong under /lib/firmware/updates/qcom/sdm850/LENOVO/81JL/.
Extracting them
The image ships Fedora's qcom-firmware-extract. Run it once:
sudo c630-firmware
sudo reboot
That wraps qcom-firmware-extract and regenerates the initramfs afterwards,
which matters — the ADSP firmware has to be available before the root
filesystem is mounted, and overlay/etc/dracut.conf.d/10-c630.conf only takes
effect on a rebuild.
If it cannot find Windows, mount it yourself and point the tool at it:
lsblk -o NAME,SIZE,FSTYPE,LABEL # find the NTFS partition
sudo mkdir -p /mnt/windows
sudo mount /dev/sda4 /mnt/windows
sudo qcom-firmware-extract --windows-dir /mnt/windows
qcom-firmware-extract was written for the Snapdragon 8cx and X Elite laptops.
If it does not recognise the SDM850, copy the files by hand — they are in
Windows/System32/DriverStore/FileRepository/ under a qcdx*.inf_arm64_*
directory:
sudo find /mnt/windows/Windows/System32/DriverStore/FileRepository \
-iname 'qc*850.mbn' -o -iname 'ipa_fws.elf' -o -iname 'qcdxkmsuc850.mbn'
sudo mkdir -p /lib/firmware/updates/qcom/sdm850/LENOVO/81JL
sudo cp <each file> /lib/firmware/updates/qcom/sdm850/LENOVO/81JL/
sudo dracut --force --regenerate-all
Check it took:
dmesg | grep -iE 'remoteproc|adsp|cdsp'
Baking firmware into the image
If you would rather not repeat the extraction on every reinstall, drop the files
into firmware/local/ in this repo, mirroring the /usr/lib/firmware/updates/
layout:
firmware/local/qcom/sdm850/LENOVO/81JL/qcadsp850.mbn
firmware/local/qcom/sdm850/LENOVO/81JL/qccdsp850.mbn
...
build/stage2.sh picks them up automatically. They are gitignored, and should
stay that way — this repository is public and the blobs are not yours to
publish.