Hallo Alexey!

 AV> So now you would.

So now I wouldn't.  I suppose it depends on the definition of smart devices.  I 
probably should have said smartphones and left it at that.

 AV> Rockchip RK3288-based mediabox with 4 Gb RAM and 32 Gb flash

That I've heard of but I call those single board computers rather than smart 
devices.  I used to build kernels AND rootfs that targetted such devices.  Pure 
c source too, compiled by gcc, gcc-4 being the favoured compiler to take care 
of them.  Also build a complete developemnt system in ~128M based on gcc-4 and 
glibc-2.something.or.other.  I don't remember now which version of glibc.  
Absolutely zero java and given the native development enviroment I'd say 
infinetly more powerful than anything java based.  Also zero python and/or perl 
while we're at it.  bash was king on it.

 AV> Building the kernel takes approx. 2 hours there :-)

Not bad.  Which version?

Het leven is goed,
Maurice

... Huil niet om mij, ik heb vi.
--- GNU bash, version 5.0.11(1)-release (x86_64-pc-linux-gnu)