RPI4 clock speeds and serial port ( temperatures idle and -j4 buildworld buildkernel )

[bob prohaska]

On Thu, Mar 18, 2021 at 10:14:26PM -0700, Mark Millard wrote:
> 
> World build completed on Thu Mar 18 21:31:44 PDT 2021
> World built in 29705 seconds, ncpu: 4, make -j4
> . . .
> Kernel build for GENERIC-NODBG completed on Thu Mar 18 22:10:02 PDT 2021
> Kernel(s)  GENERIC-NODBG built in 2298 seconds, ncpu: 4, make -j4
> 
> So somewhat under 9 hours.
> 

So my figures (~17 hours) seem reasonable for a default clocking.
I thought maybe I'd done something wrong.

For now I'll leave the clocking alone. But some puzzles remain:
It appears that the CPU and the GPU have separate clocks. Can they
be set separately, and does the GPU have any practical effect on
FreeBSD's behavior once boot is complete? 

Thanks for writing!

bob prohaska