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 · 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 …
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 …
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 …
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 …
c - request_irq returns -22 (-EINVAL) - Stack Overflow
May 31, 2016 · Is it because of the irq number? Because after set the irq num to 10, I can register the irq successfully. The irq number 50 is not in /proc/interrupts, why can't I use it?
assembly - NMI and IRQ interruptions - Stack Overflow
May 8, 2014 · The NMI (non-maskable interrupt) and IRQ (interrupt request) are separate physical pins on the CPU package. When an interrupt is triggered, execution jumps to a …
What request_irq () does internally? - Stack Overflow
Dec 21, 2016 · what is happening after request_irq ()? A device driver registers an interrupt handler and enables a given interrupt line for handling by calling request_irq ().
c - Does using the `__irq` specified for a function pointer …
Aug 27, 2021 · void Reset_Handler(void) { // ... no interesting } I read up on __irq and the ARM compiler docs state the following: The compiler generates function entry and exit sequences …
What's the role of __irq in ARM System Programming?
Feb 4, 2013 · What about ARM IRQ Re-enable?? @PraveenFelix Normally, the interrupt controller hardware disables interrupts upon entering and enables them upon exiting - as CPU …