> -----BEGIN PGP SIGNED MESSAGE-----> On Fri, Jun 09, 2006 at 01:53:34PM
+1200, Miskell, Craig wrote:
> >
> > > On Fri, Jun 09, 2006 at 12:25:16PM +1200, Miskell, Craig wrote:
> > > > 5) Playing with memmap to exclude mem from 610-640K from
> > > being used by
> > > > the kernel.
> > >
> > > How about these kernel options ?
> > >
> > > memmap=exactmap [KNL,IA-32] Enable setting of an exact
> > > E820 memory map, as specified by the user.
> > > Such memmap=exactmap lines can be
> > > constructed based on
> > > BIOS output or other requirements.
> > > See the memmap=nn@ss
> > > option description.
> > >
> > > memmap=nn[KMG]$ss[KMG]
> > > [KNL,ACPI] Mark specific memory
> as reserved.
> > > Region of memory to be used, from
> ss to ss+nn.
> > I used memmap=3K$637K to avoid the 3K segment just below
> 640K (which my
> > BIOS diagnostics told me was reserved), with no luck. I
> bumped that up
> > to memmap=30K$610K (lots of padding), also without luck.
> >
> > Similarly, I have tried:
> > memmap=240M@16M (no luck)
> > And
> > mem=240M@16M ( no luck)
> >
> > as there seems to be some varying opinions on the 'net as
> to which of
> > those is correct syntax.
>
> There are not varying opinions. Using @ (instead of $) is a
> valid syntax
> if you want to _force_ the kernel to use that region :)
Sorry, I meant "mem" vs "mmmap".
I also thought that @ meant *only* use the specified region, but in
hindsight that is not quite right. If I now understand correctly, @
forces the kernel to use memory it would not otherwise, and $ forces it
to ignore memory that it would otherwise use. Is that correct?
Craig
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