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    SubjectRe: ARM Linux Suitability for Real-time Application


    On Wed, 22 Jun 2005, Russell King wrote:

    > If you're just after some background process to run off interrupts with
    > minimal interrupt latency, the good news is that you don't have to modify
    > the kernel on ARM, and you certainly don't need any RT patches.
    >
    > If you use the FIQ, then your FIQ latency will be the time it takes the
    > CPU to enter your FIQ function. Since the kernel _never_ disables FIQs
    > in any way, FIQs have ultimate priority over everything else in the
    > system.
    >

    Aren't FIQ's only on some ARM's ?


    Daniel

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