Re: Porting to my custom 030 board

[Hauke Fath <hauke%Espresso.Rhein-Neckar.DE@localhost>]

On Wed, 1 Oct 2025 11:59:01 +0100, Lawrence Manning wrote:
> Thanks for the mail and your interest in my board, and desire to get
> NetBSD working on it. I've had a very brief look at 11 but still can't
> really figure out how to begin my own porting effort.

I will put a link block below, maybe that'll help. If anything, there 
is probably too much information out there of the 'almost, but not 
quite your setup' kind. Weeding it out will be part of the learning 
curve, while teaching you what to find where in the source tree. And, 
as Jason said 
<https://mail-index.netbsd.org/port-m68k/2025/02/18/msg000935.html> - 
start simple.

> Do you have a
> set of changes which just add support for a new machine? Ideally
> something m68k, but I might glean some knowledge looking at another
> machine type.

%  ls -1d sys/arch/*68*
sys/arch/luna68k
sys/arch/m68k
sys/arch/mac68k
sys/arch/mvme68k
sys/arch/news68k
sys/arch/next68k
sys/arch/sun68k
sys/arch/virt68k
sys/arch/x68k
%

plus amiga, atari, hp300, with m68k being the common ground for the 
arch. Look through the ports, compare how they do things. Some will be 
closer to your hardware than others.

> FWIW my offer is still open, but I can gather from the lack of
> interest that either not enough skilled people are interested in such
> a board, or that they know it would be a reasonable amount of work
> even for them?

Well, for one, if I were looking for a 68k board to port NetBSD to (and 
had the round tuits), I would probably start with a simpler one. No 
offense, but your design packs considerable complexity...

Cheerio,
Hauke

____________________________

<https://www.netbsd.org/developers/new-port.html>
<https://www.netbsd.org/docs/kernel/programming.html>
<https://www.netbsd.org/docs/kernel/porting_netbsd_arm_soc.html>
<https://www.netbsd.org/docs/kernel/bus_dma.pdf>
<https://man.netbsd.org/bus_space.9>
<https://man.netbsd.org/bus_dma.9>

<https://www.usenix.org/legacy/event/usenix99/full_papers/cranor/cranor.pdf>
<https://www.bsdcan.org/2019/schedule/attachments/483_riscvnetbsd.pdf>
<https://blog.netbsd.org/tnf/entry/porting_netbsd_to_allwinner_h3>
<https://www.garbled.net/tmp/bringup.pdf>
<https://ftp.netbsd.org/pub/NetBSD/misc/ddwg/NetBSD-driver_writing-1.0.1e.pdf>
<https://www.teamten.com/lawrence/291.paper.pdf>
<https://2002.eurobsdcon.org/papers/ushakov.ps>
<https://arxiv.org/pdf/1605.05810>

-- that should keep you busy for a while...  ;)

-- 
Hauke Fath                        <hauke%Espresso.Rhein-Neckar.DE@localhost>
Linnéweg 7
64342 Seeheim-Jugenheim
Germany