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Edited by bronco at 2015-11-29 03:05
Because it doesn't work. Hardware doesn't matter, software does.
The RPi is the one big exception: There a real user community exists and software evolved so it's able to use the most important/powerful parts any ARM SoC provides: GPU and VPU (CPU is nearly irrelevant). And this is due to relying on the very same SoC with just slight modifications for years now. The RPi's heart (SoC) is focussed on SBC useage whereas all the Allwinner SoCs are focussed on cheap tablets (not any more -- they consider this market being dead) or other Android stuff like OTT boxes, 'smart home', 'IoT', $insert-your-favourite-buzzword-here.
I can use an old boring RPi from 2012, adjust its CPU clockspeed down to the minimum (200 MHz) and let this beast both play HD video as well as encode h.264 encoded HD video from its camera module. Since I'm able to use VPU/GPU there (ARM CPU cores in consumer SoCs are always too slow no matter how you might overclock them or not). And this is what makes the difference: the software (to be able to use the more interesting hardware parts inside a SoC).
I would suspect the people who do the real work (linux-sunxi community) get bored rather sooner than later by Allwinner every few months throwing out the next bunch of cheap SoCs that are incompatible to existing ones, requiring huge amounts of new work and providing: nothing interesting (only weird combinations that target weird markets: eg. slow quad and octa core CPUs combined with ultra-slow GPUs -- but that's obviously what these markets demand: more CPU cores even if they're completely irrelevant).
By always demanding the most cheap hardware possible you end up with what you deserve: with either Android toys (horrible software/SDK made by Allwinner) or paperweights (horrible software/SDK made by Allwinner with purged Android bloatware, somewhat rehashed by 'vendor' and mostly fixed by the community to give the impression Linux has to feel like crap)
BTW: Regarding the software situation this is somewhat unique: https://groups.google.com/forum/#!topic/linux-sunxi/Ze_UhiO00t8
The very same guys that will tell everyone through kickstarter that their hardware will run flawlessly with Linux (not true as usual until the community jumps in) at least seem to care a little bit: they ask the community prior to starting their kickstarter campaign. Let's see how things evolve
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