Subject: Re: A7000+ install problems
To: None <port-arm32@netbsd.org>
From: Chris Gilbert <chris@buzzbee.freeserve.co.uk>
List: port-arm32
Date: 10/30/2000 19:51:20
On Sun, 29 Oct 2000, David Brownlee wrote:
> On Fri, 27 Oct 2000, Chris Gilbert wrote:
> > > > > Is the A7000 special with respect to needing the correct amount
> > > > > of video RAM set in the bootloader? Does anyone know how to probe
> > > > > that?
> > > >
> > > > I just guessed at the amount. I just randomly chose 1024K. Later on
> > > > I also tried 2048K and that worked as well. So, I don't think it
> > > > matters that much. I'm not using X yet, it might be more important
> > > > for that.
> > >
> > > Wasn't there something special about the A7000 and Video RAM (such
> > > as it didn't have any and just used some of the normal RAM?)
> >
> > Yes, you use the DRAM, as can a RPC with no VRAM. The amount needed is
> > the same as under Risc-OS, eg 1024x768 at 256 (1byte) colours is about
> > 768KB.
>
> So the value is only needed on a machine without VRAM? On a
> machine with 1MB of VRAM can you set it to 2MB to use 2MB of DRAM
> with higher resolution/bpp?
I'm not actually sure on this. might be timing issues if doing that (and
maybe DMA issues?)
> > Perhaps it's time to start up that wish list of things to try to get into
> > 1.6 (and smaller stuff into 1.5.x)
>
> For 1.5 would it make sense to default the value to 768KB?
Probably, but time is pressing for 1.5.
> > I know that there's a list of PR's that need to be looked at.
>
> Definitely - can you submit one for this?
Might have to pester me again, but I will eventually.
Chris