Re: TI yenta-alikes (was: ToPIC specific init for yenta_socket)

From: Alan Cox (alan_at_lxorguk.ukuu.org.uk)
Date: 08/07/03

  • Next message: Jan Niehusmann: "LBA48 on Promise 20265" 
    To: Russell King <rmk@arm.linux.org.uk>
Date:	07 Aug 2003 13:18:15 +0100

    On Iau, 2003-08-07 at 10:02, Russell King wrote:
    > doing is *wrong*. The only people who know whether the pin has been
    > wired for INTA or IRQ3 are the _designers_ of the hardware, not the
    > Linux kernel.

    That assumes the yenta controller isnt hotplugged.

    > Currently, the Linux kernel assumes a "greater than designers" approach
    > to fiddling with the registers which control the function of these pins,
    > and so far I've seen:
    >
    > - changing the mode from serial PCI interrupts to parallel PCI interrupts
    > causes the machine to lock hard (since some cardbus controllers use the
    > same physical pins for both functions.)

    Basically we got burned by changing the IRQMUX register rather than just
    using it as an information source.

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  • Next message: Jan Niehusmann: "LBA48 on Promise 20265"

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