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    SubjectRe: Reserving physical memory at boot time
    On Wed, 4 Dec 2002, Richard B. Johnson wrote:

    | On Wed, 4 Dec 2002, Mike Galbraith wrote:
    |
    | > At 08:25 AM 12/4/2002 -0500, Richard B. Johnson wrote:
    | > >On 3 Dec 2002, Alan Cox wrote:
    | > >
    | > > > On Tue, 2002-12-03 at 21:11, Richard B. Johnson wrote:
    | > > > > If you need a certain page reserved at boot-time you are out-of-luck.
    | > > >
    | > > > Wrong - you can specify the precise memory map of a box as well as use
    | > > > mem= to set the top of used memory. Its a painful way of marking a page
    | > > > and it only works for a page the kernel isnt loaded into.
    | > > >
    | > >
    | > >If you are refering to the "reserve=" kernel parameter, I don't
    | > >think it works for memory addresses that are inside existing RAM.
    | > >I guess if you used the "mem=" parameter to keep the kernel from
    | > >using that RAM, the combination might work, but I have never
    | > >tried it.
    | >
    | > reserve= is for IO ports (kernel/resource.c). I think Alan was referring to
    | > mem=exactmap.
    | >
    | > If Duncan didn't have the pesky requirement that his module work in an
    | > unmodified kernel, it would be easy to use __alloc_bootmem() to reserve an
    | > address range and expose via /proc. But alas...
    | >
    |
    | Well that parameter is not documented in:
    |
    | .../linux-2.4.18/Documentation/kernel-parameters.txt.
    |
    | Perhaps it's a 2.5.++ thing.

    Patch for 'mem=exactmap' in 2.4 was submitted several weeks ago and
    Alan merged it into -ac. It does need to be pushed to Marcelo...

    --
    ~Randy

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