I've followed the instructions posted by Phil (THANKS!) and have managed to
get a kernel working, and the scheduler/fifo/etc modules load fine. Now
the problems begin. When I run the "frank" example I get the following
output:
FIFO 1: Frank
FIFO 2: Zappa
FIFO 2: Zappa
<Machine hangs - hard; no ctl-alt-del, no magic sysreq>
Right. So after rebooting/fscking I insmod the standard kernel module I've
been writing to make sure that it still works. It basically counts
interrupts (irq 7). Strangely enough, it appeared to be getting 50-80
spurious interrupts per second. Reported by both the driver and
/proc/interrupts. I rebooted into standard linux, and all was normal.
weird. I moved the driver to IRQ 6 (which is not hooked up to anything, as
far as I know), and aside from 3 interrupts when the module was loaded, no
further spurious interrupts were recorded.
Less important, but very odd is that my timer interrupt is now handled by
the XT_PIC, not the IO-APIC. I assumed this was standard behavior. Also,
I have a dual CPU machine, and I noticed that interrupts were no longer
even remotely balanced between the two CPUs. Here is the output of cat
/proc/interrupts:
STANDARD LINUX:
CPU0 CPU1
0: 9367773 9300843 IO-APIC-edge timer
1: 14880 14688 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
5: 137327 137440 IO-APIC-edge Sound Blaster 16
7: 974219 1048723 IO-APIC-edge decks
8: 2 2 IO-APIC-edge rtc
12: 1973335 1947580 IO-APIC-edge PS/2 Mouse
13: 1 0 XT-PIC fpu
14: 9062 8616 IO-APIC-edge ide0
15: 41 35 IO-APIC-edge ide1
18: 61438 61446 IO-APIC-level eth0
19: 61968 61714 IO-APIC-level aic7xxx
NMI: 0
ERR: 0
RTLinux:
CPU0 CPU1
0: 183843 2572 XT-PIC timer
1: 1815 3957 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
5: 0 0 IO-APIC-edge Sound Blaster 16
8: 1 1 IO-APIC-edge rtc
12: 30323 29313 IO-APIC-edge PS/2 Mouse
13: 1 0 XT-PIC fpu
14: 16 11 IO-APIC-edge ide0
15: 23 5 IO-APIC-edge ide1
18: 290 306 IO-APIC-level eth0
19: 24459 24787 IO-APIC-level aic7xxx
NMI: 0
ERR: 0
Anyone have any ideas? I'm very confused.
--
Nolan Leake
Section 8
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