Messages in this thread | | | Date | Thu, 23 Jun 2005 11:44:13 +0800 | From | Andrew Lewis <> | Subject | Re: ARM Linux Suitability for Real-time Application |
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Russell King wrote: > On Wed, Jun 22, 2005 at 09:52:40AM -0700, Daniel Walker wrote: > >>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 ? > > > Yes, but please read the original mail. I think you'll find my reply > is completely relevant to the question being posed, which was based > upon the AT91RM9200 SoC.
Thanks for the suggestions. The FIQ solutions sounds like the one to use. I'll probably do a little testing sometime in the next few weeks to determine the maximum loading I can place on the processor when running some of the other peripherals simultaneously. If I have time I'll test the -RT patches as well and post up some numbers for this processor.
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