Regarding memory - I'm not much of the Linux developer - more of a HW 
engineer, so Linux concepts are still new to me. This with memory security 
certainly makes sense - I've already seen that something messes up with 
Disp driver when I modprobe Mali drivers, pretty sure it's memory related 
as everything is shared as you said. Basically I can't use layers anymore 
if I use Mali driver, which is just insane and I think UMP and DRM have 
something to do with it.

Regarding CSI and DISP: as I said - not much of a Linux developer so I 
cannot actively be involved with the Sunxi stuff. I meant more in this 
passive way - I've made a thread regarding CSI in which I described my 
fixes and findings and also this thread where I did post how I solved my 
issue with overlay. If you look at them, I think you will also have only 
swearwords, as my fixes are pretty dirty - maybe in a year or two I will be 
able to contribute to the actual kernel development (obviously some other 
SoC, as A20 will be dead by then), but I feel that now I would only 
introduce more problems with my dirty contributions :)

It's the same with simplicity - as I'm new to all this, Allwinner's simple 
drivers are much more suited for me to clean them up compared to Freescale, 
where everything is so abstract that I needed too much time for some rather 
simple mods.

Regarding HW - I meant that I'm rather pleasantly surprised with the A20, 
because i.MX6 was full of HW errata and chip revisions. Also a major weak 
point of i.MX6 is its IPU - it has limitations which renders the image 
pipeline almost useless (100Mpix / sec max for IPU for instance => no 
Full-HD @60 fps possible, only 30fps). i.MX6 kernel is full of workarounds 
for these issues and it's really bloated in some places because of this 
(IPU split mode for instance - SW workaround for 100 Mpix limit - terrible 
tearing). In contrast, once something is working on Allwinner, it just 
works, which I really respect.

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