pinebook 1080 updating?

["Aaron J. Grier" <agrier%poofygoof.com@localhost>]

this seems a simple question, but how do I update a pinebook 1080 from
source?

I have been able to successfully boot an image from invisible.ca, but
I'm not clear how to keep it going forward.  on other arches I can do
build.sh and unpack the resulting sets.  (have done this at various
points with i386, amd64, sparc, pmax, alpha, vax, and sgimips.)

there's no man page for evbarm/boot, evbarm/intro doesn't mention the
pinebook (or aarch64 at all), and it's unclear how to update
/boot/netbsd.img .  Is there some program to take the ELF /netbsd and
convert it?

-- 
  Aaron J. Grier | "Not your ordinary poofy goof." | agrier%poofygoof.com@localhost
  "The price of reliability is the pursuit of the utmost simplicity.  It
   is a price which the very rich find most hard to pay."  -- Tony Hoare