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    SubjectRe: [linux-fbdev] Re: request_region for MMIO?
    >>>>> "Geert" == Geert Uytterhoeven <> writes:

    Geert> On 1 Feb 1999, Jes Sorensen wrote:
    >> >>>>> "Geert" == Geert Uytterhoeven
    >> <> writes:
    Geert> Is it OK to use request_region() for claiming memory mapped I/O
    Geert> registers?
    >> Certainly not.
    Geert> Is there any good reason why

    Oh did I get you wrong here, do you mean PCI I/O registers that just
    happen to be mem mapped on non x86 architectures or do you actually
    mean PCI shared memory type registers?

    Geert> while get_ioport_list() uses `%04lx' to print the claimed
    Geert> regions? This makes me think I should use request_region() for
    Geert> `PC' I/O port regions only.
    >> Correct

    Geert> Then what should I use?

    For I/O port type things you use request_region(), for real shared
    memory there is currently no mechanism afaik.

    Geert> BTW, on m68k we never used request_region() and friends, so we
    Geert> are wasting memory for that 128-entry table in
    Geert> kernel/resource.c ;-(

    We will need it for supporting the ISA bus bridges for the Amiga,
    Atari and other boxes.


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