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.
Understanding kernel message 'nobody cared (try booting with …
Dec 13, 2012 · 19 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 …
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 · On an SMP machine we must use spin_lock_irqsave and not spin_lock_irq from interrupt context. Why would we want to save the flags (which contain the IF)? Is there another …
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 …
linux device driver - request_irq fails because there is no irq ...
Nov 15, 2019 · The irq_create_fwspec_mapping will either return an existing (mapped) virtual IRQ number, or map a new one. The struct irq_fwspec contains all the information that would be …
linux kernel - Wait for interrupt for specific level - Stack Overflow
Jun 14, 2024 · Seems like interrupting on IRQ_TYPE_EDGE_BOTH would work. Instead of trying to obtain an interrupt for a specific level, you have to accept an interrupt that occurs on every …
linux - What is an “irqchip”? - Stack Overflow
May 23, 2020 · An "irqchip" is KVM's name for what is more usually called an "interrupt controller". This is a piece of hardware which takes lots of interrupt signals (from devices like a USB …
c - Does using the `__irq` specified for a function pointer …
Aug 27, 2021 · the vector table and what you wrap the handler with are two separate topics. vector/exception solution is architecture specific. what matters for the cortex-m is that the lsbit …
Interrupt handler: request_irq returns error code -16
Apr 28, 2020 · I am writing a simple driver, which could register an interrupt and handle it. I am using the request_irq function but it returns this error: genirq: Flags mismatch irq 29. 00004004 …