Path: utzoo!attcan!uunet!aplcen!haven!uflorida!gatech!bloom-beacon!eru!hagbard!sunic!mcsun!cernvax!chx400!ethz!visinfo
From: visinfo@ethz.UUCP (VISINFO c/o Sascha Schnapka)
Newsgroups: comp.sys.amiga.hardware
Subject: RE: A2090 on A3000 (was: whats the story with st-506 drives on the 3000
Keywords: 32bit, DMA
Message-ID: <6364@ethz.UUCP>
Date: 25 Oct 90 11:15:11 GMT
References: <1990Oct11.004827.24144@cbnewsj.att.com> <15163@cbmvax.commodore.com>
Reply-To: visinfo@bernina.UUCP
Organization: ETH Zuerich, Switzerland
Lines: 33

In article <15163@cbmvax.commodore.com> daveh@cbmvax.commodore.com (Dave Haynie) writes:
[some lines removed]
>You can probably trick the A2090 into working.  The problem is in software.
>The A2090 device driver, like many Zorro II drives, never considered the 
>possibility of Fast memory it can't DMA into being available at boot or
>BindDrivers time.  
>
>Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"

At this point,I would like to repeat a question that has not yet been
answered:
Why does the A3000 Kickstart1.3 scsi.device driver refuse to work, as
soon, as any 24bit-DMAable memory is availabe on boot-up??

I tried several memory hacks to make 24bit-bug software run.
This would solve at the same time the problems with say AmigaBASIC
and the 2090 in a way not perfect, but usable.
The central idea, which theoretically works fine is to map some of the
onboard memory from $07x00000 to $00c00000.
I did so and it works, except that the scsi.device refuses to boot from
hd. Ofcourse, the memory is auto-added because the old exec.library
in the a3000 kick1.3 still has this function.
I have tested a lot of other things, trying to find out what exactly
causes the problem, but all I found out is that it is definitely
not the lack of the memory at $07x00000 or it having 'a hole'.
The A3000 boots as long, as the $00c00000 memory has not been added to
the system memory list. After the next 'cold' reboot (not an A3000-cold
reloading the Kickstart, but a normal cold-reboot that reinits execbase)
the memory is recognized and the A3000 displays the Workbench sign.
If you boot then from floppy, everything works fine, the memory IS
at $00c00000 AND AmigaBASIC works WITHOUT being in Chip-Memory.

F.Burgel (BIX: hardwiz)