Subject: Re: AVR port?
To: kevin neff <firstname.lastname@example.org>
From: Ken Seefried <email@example.com>
Date: 05/31/2002 02:51:41
kevin neff writes:
> sadly, it seems impossible to create hardware without also creating
> a HUGE software problem.
Deep insight, grasshopper...you are on the path of enlightenment.
> however, if netbsd could be made to run on a
> system with only a reasonable amount of pain and not too much re-inventing, the
> project could be general enough to be useful and i could continue attending
> classes instead of coding :)
NetBSD is about as portable as you can get, assuming you meet some minimum
> + does the processor need be 32-bit?
No...it can be 64-bit (and one would assume longer in the future).
Someone looking for a 16-bit Unix can look at 2BSD, though it is very tied
to the PDP-11 architecture, esp. the PDP-11s peculiar MMU. I suppose now
one could also look at the AT&T V code. Break out your Lyons book.
> is this simply for the convenience of memory addressing?
I don't understand the question.
> does the idea of using multiple 8-bit processors
> instead of their more expensive counterparts make you laugh?
Chortle would probably be a better word.
> if so, why?
Because the kernel alone wouldn't fit in the address space on an 8-bit
processor. Then there is the speed. We could go from there...
> + is a mmu absolutely essential?
Yes. Look at uCLinux or some embedded OS if you don't have one.
> is virtual memory essential?
VM is implimented by the kernel, so it's implicit.
> + how do i get started with a port? are there some general guidelines?
Download the source, read the docs & mailing lists (referenced from
http://www.netbsd.org), go from there.
> + roughly, how many hours/days/months/years does an average port require?
No idea...I've been fiddling with a port for months and made no progress
(but then, I'm not exactly a clueful...:-) OTOH...the Wasabi guys crank
them out over cocktails...
> well, there it is. thank you for your time. i'll be looking forward to hearing
> from you!
Best of luck...