What is the difference between FIQ and IRQ interrupt system?
Jun 10, 2009 · I want to know the difference between FIQ and IRQ interrupt system in any microprocessor, e.g: ARM926EJ.
Linux UIO IRQ related periodic CPU usage - Stack Overflow
Apr 17, 2025 · I have an Intel Arria 10 SoC FPGA system with 5.4.104-lts Linux built with Yocto 3.3.1 and Poky. The installed FPGA image is doing nothing more than making interrupts to an …
Understanding kernel message 'nobody cared (try booting with …
Dec 13, 2012 · 21 I'm trying to understand the meaning of the following message: irq N:nobody cared (try booting with the "irqpoll" option) Does this mean the IRQ handler not processing the …
What are linux irq domains, why are they needed?
Dec 19, 2015 · handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain, level)); irq_find_mapping() will find linux IRQ number by hardware IRQ number (using IRQ domain …
Interrupt-handling within kernel-module: request_irq() returns -22 ...
Aug 10, 2016 · request_irq(irqNumber, handler, 0, "GPIO_Test", NULL); but It returns -22, Invalid parameters. I think it might be the handler-function because I'm not sure about it's signature - …
How to determine the IRQ number for a USB device?
May 18, 2013 · However, I am wondering how I would find what IRQ line (IRQ number) the device is interrupting on? That is, how do I determine what the value of the argument unsigned int irq …
spin_lock_irqsave vs spin_lock_irq - Stack Overflow
Nov 26, 2015 · spin_lock_irqsave is basically used to save the interrupt state before taking the spin lock, this is because spin lock disables the interrupt, when the lock is taken in interrupt …
What limits the number of IRQ descriptors a Linux platform can …
Nov 18, 2024 · So I have an older hardware platform, which has a hard-coded NR_IRQS defined in the kernel to specify the number of available IRQ descriptors. This limit corresponds to the …
Interrupt handling in Device Driver - Stack Overflow
The Same Interrupt number has to be mentioned in the Device Tree entry for instantiation of device driver. The Device driver's usual probe function parses the Device tree data structure …
linux - How does generating an interrupt (calling irqfd) calls an ...
Jul 20, 2021 · You can check the specification of how those IRQ chip works to transfer the external signal to the destination core (vcpu). For example, if you were using a x86 virtual …