Hi, 2012/5/10 Grant Edwards <grant.b.edwards@xxxxxxxxx>: >> If the 20usec requirement is hard, you can also look at using an FIQ. > > Does the normal AT91 kernel not use FIQs at all? If so, I might be > able to dedicate the FIQ to this function and have it happen without > the Linux kernel knowing about it (or affecting it). Any > communication between it and a normal user-task would have to be > handled carefully... 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. Kind regards, Remy -- 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
