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fp6-img/README.md
Jorijn van der Graaf 074d1b1c90
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build.sh: first runnable revision 
Learned from the pmbootstrap 3.11 source: aports overlays must replace
upstream dirs in one tree (duplicate pkgnames are a hard error), pmbootstrap
refuses root (drop to a sudo-capable build user), and export symlinks are
boot.img + fairphone-fp6.img. Stage 1 builds without imsd until the v0.3.0
tag exists. Temporary push trigger for bring-up.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-08-08 16:20:02 +02:00

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fp6-img

Flashable postmarketOS images for the Fairphone 6, built nightly from the Catcrafts milos-linux combined-stable kernel branch, with imsd (userspace VoLTE) preinstalled.

Maintained by Jorijn van der Graaf (TheMightyCat) at Catcrafts.

Caution

Emergency calling is unverified. Calls (including 112/911) go through imsd, whose emergency path is spec-shaped but has never been verified against a live network. There is also a known kernel bug that can wedge the modem data path until reboot. Do not rely on a phone running this image to make emergency calls.

What works

Everything on the combined-stable branch: display, touch, wifi, cellular data, NFC (reader), speaker audio, microphone, IMU, magnetometer, barometer, ambient light/proximity — plus VoLTE calls (both directions) through imsd.

Verified on exactly one device / one carrier (KPN NL). Reports from other carriers are very welcome.

Flashing

Download boot.img and fairphone-fp6.img from the latest release, unlock the bootloader (Fairphone's official process), then:

fastboot flash userdata fairphone-fp6.img
fastboot flash boot boot.img
fastboot reboot

Default login: user / 147147 (same as official postmarketOS images — change it). Never re-lock the bootloader with a custom image installed.

VoLTE configuration

imsd is installed but needs your carrier's P-CSCF address:

# /etc/imsd.env
PCSCF=<your carrier's P-CSCF IPv6 address>

Find it in a stock-firmware capture or your carrier's IMS documentation, then systemctl restart imsd. See the imsd README for the full variable reference and carrier assumptions.

How it builds

build.sh drives pmbootstrap with the aports/ overlay in this repository:

  • device/linux-postmarketos-qcom-milos — the pmaports kernel aport, repointed at combined-stable (source tarball generated with git-archive; the Forgejo instance serves no source archives) with the exact kernel config the development FP6 runs.
  • modem/imsd — imsd, packaged from source. Its provides=81voltd keeps the conflicting modem-firmware IMS helper off the image (two IMS stacks cannot share one PDN).
  • main/postmarketos-config-nftables — adds the -imsd subpackage accepting imsd's IPsec-protected SIP ports on the IMS PDN (auto-installed alongside imsd).

Roadmap

  • End-to-end pipeline validation (build.sh has TODO(validate) markers)
  • Speaker-audio userspace files (AudioReach topology + UCM; firmware redistribution being sorted out)
  • imsd 0.3.0 tag (aport currently needs it published)
  • Nightly schedule once the first dispatched run is green