Re: [PATCH] ppc64: Add mecanism to check existence of legacy ISA devices

From: Linus Torvalds (torvalds_at_osdl.org)
Date: 10/23/04

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    Date:	Fri, 22 Oct 2004 17:32:40 -0700 (PDT)
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>

    On Sat, 23 Oct 2004, Benjamin Herrenschmidt wrote:
    >
    > This patch adds an arch function that can be overriden by the various
    > platforms at runtime, to query if a given legacy IO device actually
    > exist on the platform (based on the standard base port).

    Ehh..

    Why don't you use the "isapnp" or "acpi" interfaces?

    Yeah yeah, you don't actually have isapnp on your system. But like it or
    not, when we talk ISA enumeration, there is an existing standard for doing
    it. And since the drivers involved don't actually do BIOS calls or
    anything like that, they don't need to know that your "acpi" or "isapnp"
    enumeration comes from ppc64 firmware..

                    Linus
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