Date: Tue, 6 May 2003 00:18:52 +0200 From: Wilko Bulte <wkb@freebie.xs4all.nl> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: freebsd-alpha@freebsd.org Subject: Re: setting max memory to use on Alpha? Message-ID: <20030505221852.GA83325@freebie.xs4all.nl> In-Reply-To: <16054.55372.301789.308917@grasshopper.cs.duke.edu> References: <20030505195230.GA82080@freebie.xs4all.nl> <16054.55372.301789.308917@grasshopper.cs.duke.edu>
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On Mon, May 05, 2003 at 05:31:56PM -0400, Andrew Gallatin wrote:
>
> Wilko Bulte writes:
> > Folks,
> >
> > Shouldn't we set a default to the max phys memory
> > FreeBSD can use? Using hw.physmem in the loader I mean.
>
> It should be done based on the rpb systype in machdep.c
>
> > Given that the maximum amount of mem that can safely be
> > used on all system models appears to be 1G.
> >
> > BTW: my AS4100 is now running with 2G without incidents.
> > Which is a bit strange as I understood from Drew (tnx btw!)
> > that only Tsunami boxes can run with 2G and everything else
> > is limited to 1G?
> >
>
> I mis-spoke. I just looked at the mcpcia.c code, and its
> got a 2GB direct map window as well. So it should be happy.
This one I suppose:
/*
* Direct-mapped window: 2G at 2G
*/
#define MCPCIA_DIRECT_MAPPED_BASE (2UL*1024UL*1024UL*1024UL)
#define MCPCIA_DIRECT_MAPPED_SIZE (2UL*1024UL*1024UL*1024UL)
...
/*
* Set up window 1 as a 2 GB Direct-mapped window starting at 2GB.
*/
REGVAL(MCPCIA_W1_MASK(sc)) = MCPCIA_WMASK_2G;
REGVAL(MCPCIA_T1_BASE(sc)) = 0;
alpha_mb();
REGVAL(MCPCIA_W1_BASE(sc)) =
MCPCIA_DIRECT_MAPPED_BASE | MCPCIA_WBASE_EN;
alpha_mb();
OK..
That makes TurboLaser also a 2GB max box.
But I don't quite understand:
pchip_init(volatile tsunami_pchip *pchip, int index)
{
int i;
/*
* initialize the direct map DMA windows.
*
* leave window 0 untouched; we'll set that up for S/G DMA for
* isa devices later in the boot process
*
* window 1 goes at 2GB and has a length of 1 GB. It maps
* physical address 0 - 1GB. The SRM console typically sets
* this window up here.
*/
pchip->wsba[1].reg = (2UL*1024*1024*1024) | WINDOW_ENABLE;
pchip->wsm[1].reg = (1UL*1024*1024*1024 - 1) & 0xfff00000UL;
pchip->tba[1].reg = 0;
/*
* window 2 goes at 3GB and has a length of 1 GB. It maps
* physical address 1GB-2GB.
*/
pchip->wsba[2].reg = (3UL*1024*1024*1024) | WINDOW_ENABLE;
pchip->wsm[2].reg = (1UL*1024*1024*1024 - 1) & 0xfff00000UL;
pchip->tba[2].reg = 1UL*1024*1024*1024;
/*
* window 3 is disabled. The SRM console typically leaves it
* disabled
*/
It appears that Tsunami boxes are 1GB max?
> Also, the UP1000/UP1100/UP1500 irongate machines should be good for as
> much as 4GB of ram, but you can't squeeze that much into the box.
Not enough DIMM slots?
--
| / o / /_ _ wilko@FreeBSD.org
|/|/ / / /( (_) Bulte
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