this post was submitted on 26 Feb 2024
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Linux Phones

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Community about running GNU/Linux on phones. Projects like Ubuntu Touch, Plasma Mobile, PostmarketOS, Mobian etc. Either on former Android phones or hardware like the PinePhone.

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Got Mobian (almost) ported to Pixel 3a / 3a XL (lemmy.sdf.org)
submitted 10 months ago by [email protected] to c/[email protected]
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Most parts work, still not sure why Bluetooth gives me errors in dmesg, audio out works, microphone input not yet... I'm getting there.

But graphics, charging, low standby power consumption, LTE, wifi... those all work already.

The fact that postmarketOS has support and also that there are people working on mainline support, makes this a task that is not as difficult as I thought, as most work was already done for another distro.

Otherwise it runs more fluid than Android ever did on it and it has a great standby time (forgot to turn it off at around 80 % and a few days later it was at 58 %).

For now stuck on merging the Kernel patches from the sdm670-mainline project with those from Mobian, not really something I can do without knowing C. I just hope someone with the right skills does it at some point.

Then I just need to make some smaller merge requests, like one to add a udev rule for vibration support and so on.

Not much missing before I can finally use it as a daily driver.

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[–] [email protected] 15 points 10 months ago (1 children)

Excellent! As nice as PmOS is, Mobian seems more at home for me and I am definitely looking forward to try it on my Fairphone 5 sometimes in the nearish future.

[–] [email protected] 8 points 10 months ago* (last edited 10 months ago) (1 children)

What's PmOS? I'm intrigued

Edit: PostmarketOS. I made the connection. I must be more tired than I thought.

[–] lemmeee 13 points 10 months ago (1 children)

Impressive! I'm looking at postmarketOS wiki and it's amazing how many phones are supported now. But it seems they are not working as well as PinePhone or Librem 5 yet.

forgot to turn it off at around 80 % and a few days later it was at 58 %

Damn, I wish my PinePhone was this energy efficient!

[–] [email protected] 6 points 10 months ago (2 children)

Same, my Pinephone does that within an hour maybe xD

[–] [email protected] 4 points 10 months ago (2 children)

A64 (the SoC for PinePhone) is mostly intended for set-top boxes (i.e. smart TV), so it is really not designed for power efficiency.

It's really a bummer that most "smartphone" SoCs cannot easily be purchased, and have no proper documentations. Thinkers and smaller manufacturers are stuck with mostly Allwinner and Rockchip SoCs (most of which are engineered as embedded processors) if they want to design something from starch at all.

[–] lemmeee 3 points 10 months ago* (last edited 10 months ago)

That's what I thought and it seems like even those SoCs didn't have very good mainline Linux support.

Edit: I wonder if it would be possible to take some newer Rockchip SoC and underclock it so that it uses less power? Maybe that would help a little and it would still probably be faster than PinePhone Pro.

[–] [email protected] 1 points 10 months ago (1 children)

@PowerCore7 @erebion

If they wanna design something from starch, they'd probably be better of trying sourdough.

*badum-tss*

[–] [email protected] 1 points 10 months ago

Exactly my thought, but isn't that breadboarding then?

[–] lemmeee 1 points 10 months ago

The keyboard addon helps a lot, but it makes the phone big and heavy. I wonder what it's like with those extended battery cases that you can buy or 3D print.

[–] [email protected] 13 points 10 months ago* (last edited 10 months ago) (1 children)

Awesome work! If you don't mind me asking, what help/sources did you use to get this far in porting efforts? I have some free time on my hands and would like to try porting a newer phone such a pixel 4a or similar

[–] [email protected] 17 points 10 months ago (1 children)

Oh, I don't mind questions. :)

Help: A lot via the Mobian Ports ( #mobian-ports:matrix.org ) Matrix room and the postmarketOS offtopic ( #offtopic:postmarketos.org ) Matrix room.

Sources: Not much there yet. As soon as there are official builds for the Pixel 3a, I will start writing docs. I already have a lot of notes on what I had to do. But first I need to have someone merge the Kernel patches, as I don't know C, which makes resolving merge conflicts really hard, it turns out. Once that is done, there are just a few smaller merge requests left and builds will appear magically.

The whole process is not that difficult if there are already Kernel patches available. In the case of the Pixel 3a, I only had to clone the sdm670-mainline repo ( https://gitlab.com/sdm670-mainline/linux-patches ) , compile the kernel (two commands) and get a .deb, which I used with mobian-recipes ( https://salsa.debian.org/Mobian-team/mobian-recipes/ ) to build an image. I then wrote a config file for droid-juicer ( https://gitlab.com/mobian1/droid-juicer/-/merge_requests/4 ) which tells it what files on the vendor and modem partitions it should get, then those are copied to /usr/lib/firmware/updates/.

That was easy as dmesg will just tell you what files it cannot load because they are missing. Just find those, write the config, run droid-juicer, reboot... boom. Display, Wifi, LTE and so on working.

Then smaller stuff like udev rules for vibration and an initramfs hook ( https://salsa.debian.org/DebianOnMobile-team/qcom-phone-utils/-/blob/debian/latest/initramfs-tools/hooks/qcom-firmware?ref_type=heads ) so that firmware files get integrated into initramfs and components start to work early during boot.

The most difficult part would be merging the Kernel patches with other patches and resoving the merge conflicts... At least to me, as I don't know C.

If there are no mainlining efforts for a phone yet, then I don't know what to do, as that requires a Kernel dev.

For the Pixel 4a you mentioned, there is a postmarketOS port. So this should be doable. ( https://wiki.postmarketos.org/wiki/Google_Pixel_4a_(google-sunfish) )

That's all not that hard, my main difficulty was finding out what to do. Everything I did so far would be an afternoon of work, if I had just found the necessary information much quicker. Instead I spent two weeks, of which 95 % was finding info, lol.

Just join the Mobian Matrix room, we should be able to help you, even though I know far less than the others there...so far. :p

I do hope that's helpful and I'll happily try to answer more questions. :)

Kernel mainlining effort for the SoC in thr Pixel 4a: https://github.com/sm7150-mainline/linux

[–] [email protected] 3 points 10 months ago (1 children)

I know C and I have a pixel 3a. I could probably help out with the kernel patches if you want. I'm not totally clear what work needs to be done. You just need someone to help get those patches merged against the mobian upstream kernel?

[–] [email protected] 3 points 10 months ago (1 children)

Cool! Well, it's just a merge conflict. I don't knoe how to combine the patches. Should be pretty easy for someone that does not need to google for every line of C.

I can give you notes* later on what to do to get to the conflict, then maybe you can resolve it and push the result to some repo? :)

*Just 3 or 4 commands, I think, including the Debian gbp command

[–] [email protected] 3 points 10 months ago (2 children)

Yeah sure. I'll pull it all down and reproduce and try to get the conflicts sorted out and push the repo up somewhere. I've never built a Debian kernel before but I'm sure I can figure it out!

[–] [email protected] 8 points 10 months ago

Mmmmmm Phosh

[–] [email protected] 7 points 10 months ago (1 children)

Wish more newer pixels could get support I have tried and failed many times outside of my skills unfortunately.

[–] [email protected] 5 points 10 months ago* (last edited 10 months ago) (1 children)

You could join the Mobian Matrix room or the PostmarketOS room I have mentioned in another post on this thread (or whatever the right term is... Comment on a post? Sub-post?). I did not know anything about porting two weeks ago, but asking dumb questions helps learning.

[–] [email protected] 3 points 10 months ago

I have joined it and asked like I said above my skills at least for now I'll give a go again when I get time busy with college right now.

[–] [email protected] 4 points 10 months ago

Really interesting install here. I'm keen on developments to Mobian and related hardware.

[–] [email protected] 3 points 7 months ago (1 children)

Lit thank you for helping to expand access!

[–] [email protected] 3 points 7 months ago (1 children)

And hopefully I can save a few devices from getting trashed. :)

Made huge amounts of progress since I posted this! Should really post a follow-up at some point. :D

[–] [email protected] 1 points 7 months ago (1 children)

You’re awesome! I can’t wait to see what you have been cooking up!

[–] [email protected] 2 points 5 months ago

Will have to post a proper update soon-ish, but for now I'll just say that the device completely* works and I just have to get the kernel package into Mobian (until patches are upstream), for that get some Kernel packaging stuff right (it already builds, but is not yet the quality Debian people expect) and then create a few smaller MRs at projects which Mobian is built upon.

*everything except some sensors and some patches which exist but aren't yet pushed to git...

[–] [email protected] 3 points 10 months ago (1 children)

:( now i really wish my pixel 3 wasnt bricked

[–] [email protected] 10 points 10 months ago

Those are impossible to hard brick in my experience, you would need to break both bootloaders and recoveries. See if this helps:

https://flash.android.com/welcome

Also, Pixel 3 has different hardware, but is supported by pmOS and I've spotted some commits in Mobian, so there might be people working on it there.

[–] [email protected] 2 points 10 months ago

Very cool

[–] [email protected] 1 points 10 months ago (1 children)

Excited for this! I already have a Pixel 3a on the way to try out Ubuntu Touch.

[–] [email protected] 5 points 10 months ago (1 children)

Ubuntu touch is pretty but useless. Unlike postmarketOS/Mobian it doesn't support native linux apps.

[–] [email protected] 1 points 10 months ago (1 children)

Not exactly. But while UBPorts has a good looking user interface, they don't have many UBPorts apps yet. A regular distribution can often be more useful, but as always it depends on the use-case.

[–] [email protected] 2 points 10 months ago

What can we talk about when there isn't even an up-to-date version of the browser for Ubuntu touch?

[–] [email protected] 1 points 5 months ago

I've posted a follow-up, it looks much better now: https://lemmy.sdf.org/post/19600671