Subject: Re: Mac II and no PMMU = no boot?
To: None <port-mac68k@NetBSD.ORG>
From: Kevin Radke <>
List: port-mac68k
Date: 02/28/1996 12:48:08
> Alternatively, you can get the same functionality by installing a
> 68030 accelerator in your Mac II since 68030 has a built-in PMMU with
> which NetBSD/mac68k works just fine.  I'm running NetBSD/mac68k on an
> SE/30 beefed up (a bit ;-) by DayStar PowerCache (68030+68882@40MHz)
> with the secondary cache disabled (NetBSD doesn't boot with the
> secondary cache enabled), so I don't think you should have any problem
> with a 33-40MHz 68030 accelerator with no secondary cache on a Mac II.

I'm back with good news.  A couple days ago I booted my
Daystar enhanced SE/30 WITH the cache ENABLED!  I was running
a semi-current kernel with mods for cache support I hacked in.

I hope to release a test kernel with my changes sometime this
weekend (Time permitting).  I haven't run any benchmarks, but
the system doesn't feel a whole lot faster.  (This is probably
due to my overly generous cache flushes, and the fact that my
machine pages a lot with only 8 meg of memory)

Once I get it cleaned up, I hope the performance is more
in line with the performance gain seen in the MacOS.

|/     |)                   ~ Flight Management Systems Engineer
|\evin |\adke                ~ Rockwell-Collins Avionics    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~  Iowa State University Grad