Building a Mobian Image for the Pixel 3a

Prerequisites

Cloning the repositories

Kernel: https://salsa.debian.org/erebion/sdm-670-linux

Mobian Recipes does not have the changes merged, as the kernel is not yet part of Mobian: https://salsa.debian.org/Mobian-team/mobian-recipes/-/merge_requests/113

Take my temporary fork of Mobian Recipes instead, for now: https://salsa.debian.org/erebion/mobian-recipes/-/tree/erebion/sargo-build?ref_type=heads

The fork will be maintained until there are official Mobian images for the Pixel 3a.

Compiling the Kernel

First cd to the kernel repo.

Then:

gbp pq import # import the patches to a patch-queue branch with the patches applied
DEB_HOST_ARCH=arm64 dpkg-buildpackage -a arm64 -us -uc -rfakeroot -b -Pcross,nocheck

Building the Image

First cd to the Mobian repo
Copy the kernel deb to devices/qcom/packages, so that it gets installed onta the image we are about to build.
Add your SSH authorized keys file to overlays/ssh/authorized_keys, important so you can log in later
Make sure the internet connection is stable, as the build fails if it cannot download all packages successfully.

Now build the image:

./build.sh -t qcom -s -u mobian | tee mobian-build.log # -s for SSH, which we need later

(If you replace mobian with your own username, you will have to use that one for SSH later, of course)

Wait. It takes a while.

Note: Your SSH Host Keys seemingly get generated while building the image, please don't give your image to anyone else. To Do: Verify whether those keys really end up in the image.

Flash to device:

fastboot --set-active --slot a
fastboot flash boot_a mobian-qcom-phosh-20240614.boot-sargo.img
fastboot flash userdata mobian-qcom-phosh-20240614.rootfs.img 
fastboot erase dtbo

Boot up the device. Connect it via USB.

Temporary manual changes

The steps are documented in README.md in this repo.

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