[NanoPi M4V2 randomly crashes]

I'm hopeful we'll eventually resolve this issue. At least we can be fairly certain it's a software thing given legacy kernels are rock solid (pardon the pun).

 

One noteworthy thing is a Rock Pi 4 I've running Gentoo with a mainline kernel (5.8) is very stable with uptimes over a month.

 

The hardware is virtually identical (including the aforementioned regulator) and the default ramp delay is the same as the M4V2:

 

regulator-ramp-delay = <1000>;

 

That it's a memory setup issue is still my best guess.

[Switch kernel from legacy (rk3399) to current (rockchip64) on NanoPi M4 V2]

I advise sticking with the legacy kernel until the stability issues with the current kernels (specific to the NanoPi M4 V2) have been resolved.

[Nanopi M4 V1 won't boot latest versions]

Ditto with the V2 and latest legacy kernel.