interrupt handler in arm question

[Konstantin Zertsekel]

>> FIQ exception is not implemented in Linux Kernel.
>> Actually, when ARM CPU takes FIQ exception, it branches to 0xffff001c
>> address, which contains the below code from entry-armv.S:
>> vector_fiq:
>>        disable_fiq
>>        subs    pc, lr, #4
>>
>> Now, disable_fiq not implemented for all the platforms.
>> But, anyway, 'subs pc, lr, #4' returns the CPU to the point where
>> FIQ exception has happened and the system continues to run as usual.
>
> As you said, disable_fiq is empty in OMAP architecture.
> .macro  disable_fiq
> .endm
>
> So from the above explanation,I can saythat LINUX is not making use of
> FIQ feature of arm.Am I right?

Absolutely. --- Kosta