On 06/17/2017 09:39 AM, David Niklas wrote:
On Wed, 31 May 2017 00:16:42 +0200 sam via arm-netbook arm-netbook@lists.phcomp.co.uk wrote:
On 30/05/17 22:48, doark@mail.com wrote:
Well, I'd put ten dollars to a campaign like this without a HW reward. I'm assuming that beings that there are so many Mali GPUs and hacker boards out there that other people would also be very interested in this. What would I need to know to do this? Quick, point me to the books! No, really, I would do such a thing, I don't have a lot to loose, though for free I'd be taking my time... But still, I'd need an education.
Start from the existing code http://limadriver.org/
I understand that I understand very little about this process so please read this with hearty laugh prepared.
Whereas other older people have gone from simple reverse engineering projects to more difficult ones I have come into the game late when all the projects are the most difficult. Let me assume that the GPU is a RISC model and uses 8-bit instructions. Then it would have a total of 255 instructions (the 256th would be all zeros and be a no-op because the wires on the line need a way to tell if they have an instruction on them and that is the most power conservative I can think of). Now let use assume that if the signed bit is set that the GPU receives an instruction to set an internal option. All that I could probably learn from the lima driver and also some idea of how the 2D rendering engine works and what it's instructions are. Now the questions come up:
- What are the options for the 3D engine?
- What are the instructions for the 3D engine?
- How do the 2D, 3D, and video (de|en)code engine fit together?
To sum it up, I don't think it's as simple as downloading the code, signing up for the mailing list, and coding. It might be, someone could have left full specs laying around waiting to be turned into mock-up code and then real code; but I doubt it. That's not to say I will not try, but I just don't see this as a very productive path.
I suffer from the black box discouragement effect. Someone builds a black box, then a bigger black box, then an even larger black box; eventually no one knows how it works inside, even the people who designed it understand only a relatively small part.
IF you can figure out how to reverse engineer the 3d engine, ikcl would be very happy I am sure. But I get the feeling from him that it is nearly impossible to do this.
Not sure why... but yeah... RK3288 with 3d engine would be cool I will admit that. or an even later more compatible processor.
Still, I think you have an uphill battle for that.
ps, I don't have much reverse engineering experience at all, so what I am suggesting, could be easier or harder.
I just don't know. xD
Sincerely, David
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