Re: 2.4.21-rc7 hang on boot after spurious 8259A interrupt: IRQ15.

From: Michael Frank (
Date: Sat Jun 14 2003 - 03:57:19 EST

On Saturday 14 June 2003 16:17, Alan Cox wrote:
> > The system executes a regular boot from _reset_ at this stage.
> > swsusp takes over once the kernel is up and restores the
> > suspended kernel
> > Could it be that the kernel does not handle a spurious int at
> > this early stage in the boot process ?
> It may also be BIOS SMI handling or reset handling problems as a
> similar case a vendor investigated showed to be. The first thing is
> to make life easier for the BIOS - make sure your kernel doesnt have
> APIC support included

APIC is not in the kernel

I put

  __asm__("int $0x2f");

before calibrate_delay and inside as well for testing.
spurious 8259A int15 was reported and up to 18000 counted in
/proc/interrupts, but no hang ;-)

I suppose have to settle for hardware/BIOS (IRQ misrouted/8259
init problem or timer not working) as the cause for the hang


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