Re: ARM Linux Suitability for Real-time Application

[Daniel Walker]

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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