AN3129

Conclusion

Doc ID 16927 Rev 1

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Conclusion

The fast interrupt mechanism ensures a bounded performance with the Linux kernel without

any decrease in the overall system throughput. Its worst case is less than ten microseconds

(<10usec). However this deterministic behavior comes at the cost of some limitations in ISR

handler development, which can not utilize Linux kernel API and device driver framework.

The FIQ interrupt handling mechanism used, as described in this application note, is well-

suited for critical real time applications with SPEAr.