How to determine that my cpu is supported by kotlin/native? I'm curious about arm7tdmi

Wikipedia suggests that is an older generation of ARM7 chips. ARMv7-A is the modern 32bit ARM architecture that is usually supported. I'd suggest attempting a build with arm32 target and then try to run it on the target device to confirm.

practically speaking, most LLVM supported CPU flavours would work with K/N, however you’ll need properly pass compiler flags and configure embedded targets

is there any guide to compiler flags and targets?

I agree, a guide on how to do this, with a few examples we can try, would be very helpful

Good idea. We'll see what can be done.

have a look at this commit