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Re: FIQ on ARM processor
- To: Arnaud Mouiche <arnaud dot mouiche at inventel dot fr>
- Subject: Re: [ECOS] FIQ on ARM processor
- From: Jonathan Larmour <jlarmour at redhat dot com>
- Date: Thu, 16 Aug 2001 15:51:48 +0100
- Cc: ecos-discuss at sourceware dot cygnus dot com
- Organization: Red Hat UK Ltd.
- References: <5.0.2.1.0.20010816163127.00b1db70@193.54.84.101>
Arnaud Mouiche wrote:
>
> Hi.
>
> when reading vector.s, it looks like ecos deal with FIQ like it deals with
> IRQ. Does it means there is no advantage to use FIQ than IRQ.
Yes there is. FIQs are defined for very fast interrupts. If you choose to
use the "standard" eCos interrupt handling mechanism then this somewhat
defeats this, so there is no point eCos trying to handle FIQ differently.
But you can still attach your own VSR (written in assembler) to FIQ.
Jifl
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