Re: Raimbow screen installing / booting FreeBSD-14.2-RELEASE-arm64-aarch64-RPI.img on the raspberry pi zero 2w

On Feb 4, 2025, at 16:37, Marco Devesas Campos <devesas.campos@gmail.com> wrote:

> The problem isn’t the fix — it’s that there is simply no appropriate device tree for the zero-2 that is bundled with the image so the board has no idea how to boot.
> 
> So, while not perfect, until someone from the projects adds a zero 2 dtb, I’m guessing copying one of the pi-3 images is your best bet (I just tried it and it works — well, boots, at least).

A better alternative experiment would likely be to:

) Note the PORTVERSION used for sysutils/rpi-firmware :
  PORTVERSION=    1.20230405.g20230405
  (That encodes the date 2023-Apr-05, by the way.)

) Look for the history of bcm2710-rpi-zero-2-w.dtb to
  find one released (or at lest tagged) that is as
  similar of a vintage as is available. In this case
  there is a match for the specific version:

https://github.com/raspberrypi/firmware/blob/1.20230405/boot/bcm2710-rpi-zero-2-w.dtb

However, because it is a match, installing 
sysutils/rpi-firmware and looking at what
it installs it turns out happens to have:

/usr/local/share/rpi-firmware/bcm2710-rpi-zero-2-w.dtb

So that is the file one would likely want to copy over
to the relevant msdosfs and test rpi-zero-2-w operation
with.

But, I'll note that that the .dtb (or the live adjustments
that the RPi* firmware makes after loading the *.dtb)
may have things that the FreeBSD kernel does not support
or does not handle/avoid. A lack of any explicit development
or testing for the rpi-zero-2-w is likely why
bcm2710-rpi-zero-2-w.dtb is not on the release or stable
snapshot media.

So it still may simply not work.

I'll note that the bcm271[012]-rpi-*.dtb files are for
aarch64 (a.k.a. arm64): Tier 1 (at least for non-embedded)

Also, bcm2709-rpi-*.dtb files are for armv7 (32-bit)
instead: Tier 2.

Finally, bcm2708-rpi-*.dtb files are for armv6 (also
32-bit): Tier 2/3/Unsupported for 13/14/15 .

===
Mark Millard
marklmi at yahoo.com