Hi > > No, the kernel does not use the FIQ at all. It is free for you to use > > as you want. Communication with the FIQ handler can be done using a > > queue based on atomic instructions. Well i think there is some FIQ infrastructure in the kernel and even an FIQ switch. But the only thing it does is reserving the infrastructure. Not more not less. I have been toying around with the FIQ interrupt. On our HW (i.mx35) we still have about 30µs interrupt jitter i would like to reduce. But the Memory for the FIQ was to small and i didn't manage to jump to some c handler code within the driver. Does anybody know has some examples how to do that. Further since the FIQ is an own mode i thought the only thing one could use is memory accesses? But when working within the TCM or FIQ memory the jitter was very good (it was about 5ns if i can trust my memory). Best regards Tim -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
