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Date: Wed, 4 Sep 2002 15:02:52 -0400 (EDT)
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From: Craig Arsenault <penguin@wombat.ca>
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To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
cc: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>,
       Tom Rini <trini@kernel.crashing.org>, <linux-kernel@vger.kernel.org>,
       <linuxppc-dev@lists.linuxppc.org>
Subject: Re: consequences of lowering "MAX_LOW_MEM"?
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On Tue, 3 Sep 2002, Benjamin Herrenschmidt wrote:

> >I think you'll find yourself with no virtual address space left to
> >do vmalloc / fixmap / kmap type stuff. Or at least you would on i386,
> >I presume it's the same for ppc. Sounds like you may have left
> >yourself enough space for fixmap & kmap, but any calls to vmalloc
> >will probably fail ?
>
> Yes, same problem on PPC, you'll run out of virtual space quite
> quickly for vmalloc and ioremap. Stuff a video board with lots
> of VRAM or any PCI card exposing large MMIO regions into your
> machines and it will probably not even boot.
>
> Ben.
>

Ben,
  But doesn't using Matt's suggestion and moving both MAX_LOW_MEM and
changing KERNELBASE take care of this?  It's an embedded board with no
video, but it does have one PCI Mezzanine Card (PMC) on it.

Thanks.

--
Craig.
+------------------------------------------------------+
http://www.wombat.ca/rpmon.html    RP Music Monitor
http://www.washington.edu/pine/    Pine @ the U of Wash.
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