Linux ARM FIQ support

CONFIG_FIQ

arch/arm/kernel/fiq.c
http://lxr.linux.no/#linux+v2.6.32/arch/arm/kernel/fiq.c

Re: FIQ support on ARM-Linux
http://www.mail-archive.com/linux-arm@vger.rutgers.edu/msg04103.html

But the kernel doesn't give you a lot of help
to use FIQs; you have to do most of the work yourself. See arch/arm/kernel/
fiq.c for some example stuff, though it may not suit your needs. Really, it
all depends what you want to do.

笔记：linux中实现fiq模式（关于arm中断，唤醒中断）
http://blog.chinaunix.net/u3/99423/showart_2037446.html

AT91RM9200 FIQ FAQ and simple Example code / patch
http://warmcat.com/_wp/2007/09/17/at91rm9200-fiq-faq-and-simple-example-code-patch/
http://svn.openmoko.org/branches/src/target/kernel/2.6.24.x/patches/introduce-fiq-basis.patch

ARM中斷流程
http://stenlyho.blogspot.com/2008/08/arm.html