Raspberry Pi Zero W earmv6hf notes

[John Klos <john%klos.com@localhost>]

Hi, all,

earmv6hf on the Raspberry Pi Zero W works well, including changing the CPU 
frequency while using the serial console. Wifi works out of the box, too, 
although I haven't used it extensively yet.

I just built netbsd-10, both the OS and kernel, for the Pi on the Pi, with 
interesting results:

Kernel:
build.sh started:    Wed Jul 17 15:42:02 UTC 2024
build.sh ended:      Wed Jul 17 18:56:58 UTC 2024
11697.03 real      9622.98 user      1111.49 sys

netbsd-10:
build.sh started:    Fri Jul 12 08:01:19 UTC 2024
build.sh ended:      Wed Jul 17 09:56:20 UTC 2024

/usr/bin/time -l told us:

   438902.38 real    358555.20 user     44338.02 sys
    285228  maximum resident set size
-1704612098  average shared memory size
         2  average unshared data size
         1  average unshared stack size
 470963930  page reclaims
    129300  page faults
         0  swaps
     58797  block input operations
    188118  block output operations
         0  messages sent
         0  messages received
      5498  signals received
   3875196  voluntary context switches
  11400005  involuntary context switches


Love the average shared memory size :D

Interestingly, it took about 122 hours for the Pi to compile netbsd-10, 
where a single core of a Ryzen 5500 took about 1.85 hours. This makes the 
Ryzen about 66 times faster than the Pi, or a little more than 16 times 
faster adjusted for clock speed (1 GHz compared with between 3.6 and 4.2 
GHz).

Regardless, it works and makes for a stable and happy mail server. Much 
thanks to everyone working on NetBSD on ARM :)

John