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https://lists.kernelnewbies.org/pipermail/kernelnewbies/2011-November/003841.html
> You take a FIQ from SVC mode before you've saved any state. The SVC-mode > CPSR gets saved in SPSR_fiq. What about SPSR_svc? How are you saving/ > restoring that? (you aren't, and you can't if you switch out of FIQ mode.) > This is the fundamental problem with …
https://stackoverflow.com/questions/973933/what-is-the-difference-between-fiq-and-irq-interrupt-system
OS developers want to support multiple interrupt sources. Customer requirements for a FIQ will vary and often they realize they should just let the customer roll their own. Usually support for a FIQ is limited as any support is likely to detract from the main benefit, SPEED. Summary. Don't bash my friend the FIQ. It is a system programers one ...
https://elinux.org/images/2/27/0910-elce-fiq.pdf
Using the fast IRQ in ARM Linux (the official support and the fiq-engine external package) ELC Europe 2009 Grenoble October 15th 2009 Alessandro Rubini Independent consultant, contract professor, Pavia University What is the FIQ The ARM core offers two different maskable interrupts The normal IRO, used by all devices through a cascade of muxes
https://www.linaro.org/blog/debugging-arm-kernels-using-nmifiq/
Debugging Arm kernels using NMI/FIQ. Daniel Thompson talks about how Linaro’s work to upstream a little known tool for Android evolved into an effort, in collaboration with other contributors, to build a framework to exploit fast interrupt requests and, as a result, port a wide variety of NMI-based diagnostic techniques to Arm.
https://bootlin.com/blog/fiq-handlers-in-the-arm-linux-kernel/
The FIQ is handled as NMI and the arm mode is system mode so FIQ can be handled as normal IRQ as normal IRQ is also running in system mode. The interrupt controller is a GIC-v1 in the imx6q itself. But this only work in I select nosmp in Linux command line, that mean only cpu0 is up.
https://community.nxp.com/thread/441140
Dec 19, 2016 · Hi, I am trying to get FIQ working on IMX6 SoloX. I ported the changes from i.MX6 AVB Demo Implementation and was able to trigger the FIQ in assembly. But it will crashed when calling into the "C" code FIQ handler. Do you have an updated version for the AVB demo ported to the latest Linux 4.1.15 BSP which I can refer to?Reviews: 1
https://lwn.net/Articles/605148/
Jul 10, 2014 · The first two patches modify the FIQ infrastructure to allow interrupt controller drivers to register callbacks (the fiq_chip structure) to manage FIQ routings and to ACK and EOI the FIQ. This makes it possible to use FIQ in multi-platform kernels and with recent ARM interrupt controllers.
Hi, Is there any support for FIQ on ARM-Linux? I know that IRQs are supported and I can put my IRQ handler in proper place. But I am not able to do this for FIQ. Has anybody done this? If yes, how? I apologize if this is not the right mailing list to ask this question.....
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