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SubjectRe: consequences of lowering "MAX_LOW_MEM"?
On Wed, Sep 04, 2002 at 02:35:27PM -0400, Craig Arsenault wrote:
> On Wed, 4 Sep 2002, Matt Porter wrote:
> > Correct. The solution, in the context of the linuxppc_2_4_devel tree,
> > is to do the following:
> >
> > Enable "Prompt for advanced kernel configuration options"
> > Enable "High memory support"
> > Enable "Set maximum low memory" and set to 0x40000000
> > Enable "Set custom kernel base address" and set to 0xa0000000
> >
> > Note that highmem support will not be used in his case (he didn't
> > want to use it), because PAGE_OFFSET is at 0xa0000000 and
> > MAX_LOW_MEM is at 1GB. With this configuration, VMALLOC_START
> > will be at 0xe0000000 + VMALLOC_OFFSET leaving ample vmalloc
> > space for most applications. All system memory is mapped as
> > lowmem .
> >
> Matt,
> That looks exactly like what I'd need. Thanks.
> I grabbed the "2.4.20-pre5" source of linuxppc_2_4_devel, and
> I do see those options in there.
> However, my problem is that I cannot move to a development kernel for
> this application -> i have to stick on the stable tree. So i could
> either wait for 2.4.20 to come out, OR could i just look at where
> "CONFIG_LOWMEM_SIZE" and "CONFIG_KERNEL_START" are used in 2.4.20-pre5
> and patch them back myself to 2.4.18?

_devel is pretty stable. You don't have to use the latest, just
clone up to the changeset including 2.4.18/19 if you like. Or,
as you suggest, just use it as a reference to make a one-off
mod in your own tree. I put in these options because of the
numbers of times I had to hack these things for specific embedded
applications. :)

> Regardless, thanks very much to everyone who replied for the info.


Matt Porter
This is Linux Country. On a quiet night, you can hear Windows reboot.
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