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by NoGravitas 3488 days ago
The biggest problem I see is (and there may be other biggies, but this is the one that has bitten me), is that device support in Android kernels never gets upstreamed to Linux. Not necessarily due to GPL violations, but because even though the device source tree is published, there's no one willing to shepherd the changes upstream (and many vendor changes are low quality, so it would be a lot of work). Typically even a Nexus device is stuck on the specific kernel version that it was released with.

Google is a little better on the kernel side, but in other ways, AOSP is even worse. There's lots of good stuff done in Cyanogen and OmniROM, for example, but there's no way to get stuff into upstream AOSP. Google just pitches something over the wall once a year and ROM developers have to rebase or re-implement their ROM features.
1 comments
dispose13432 3488 days ago
The problem is that Linux's kernel interface isn't stable, so a module written for one kernel release won't work on another, and (AFAIK) they don't do major-minor releases (like PHP,Apache) where, say, the 4.0 kernel is stable and will stay stable for a few years. Rather, 4.1 could introduce braking changes as far as modules go.

And, unlike PCs, most phones don't have standard hardware, so someone kernel modules tend to be closed source and don't have "basic" mode.

As a result, to upgrade to a new Android release someone has to backport all new (kernel) features to old kernels.

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dmm 3488 days ago
If you upstream your drivers then the people who change interfaces also fix the modules that use those interfaces.

The problem is SoC manufacturers that don't want to put in the work to upstream drivers.

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dispose13432 3488 days ago
>The problem is SoC manufacturers that don't want to put in the work to upstream drivers.

They don't _open source_ their drivers.

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NoGravitas 3488 days ago
Many (most?) of them do open source their drivers. But even then, no one is willing to do the work to upstream them.
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yareally 3488 days ago
They sometimes release the driver blobs so you don't have to rip them off the device, but rarely have I heard of drivers being open sourced outside of a few scattered instances.
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dispose13432 3488 days ago
Really? Where is the full Samsung blobless kernel?
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