On Mon, 2008-02-04 at 11:55 -0800, Rick Stevens wrote:
> The IRQ won't show up unless something is on the serial port or using
> it. For example, my machine shows this normally:
>
> 0: 1668 IO-APIC-edge timer
> 1: 163398 IO-APIC-edge i8042
> 6: 6 IO-APIC-edge floppy
>
> However, if I "agetty -L 9600 ttyS0", it shows this:
>
> 0: 1668 IO-APIC-edge timer
> 1: 163146 IO-APIC-edge i8042
> 4: 25 IO-APIC-edge serial
> 6: 6 IO-APIC-edge floppy
You're right.
more /proc/interrupts
CPU0
0: 181 IO-APIC-edge timer
1: 160311 IO-APIC-edge i8042
4: 13283349 IO-APIC-edge serial
7: 0 IO-APIC-edge parport0
8: 4875078 IO-APIC-edge rtc
9: 1 IO-APIC-fasteoi acpi
12: 4 IO-APIC-edge i8042
14: 938575 IO-APIC-edge libata
15: 0 IO-APIC-edge libata
16: 64 IO-APIC-fasteoi ohci_hcd:usb1
17: 1194331 IO-APIC-fasteoi ohci_hcd:usb2
18: 0 IO-APIC-fasteoi ohci_hcd:usb3
19: 3 IO-APIC-fasteoi ehci_hcd:usb4
20: 241245 IO-APIC-fasteoi libata
21: 3694679 IO-APIC-fasteoi ALi M5455, eth0
22: 17454806 IO-APIC-fasteoi nvidia
NMI: 0
LOC: 47879444
ERR: 0
MIS: 0
I seem to dimly recall in the OLD DAYS, that serial was always on. But I
had a pile of uugettys spawned too. <grins> My last send went out, so
I'll try this one while the DvD is playing "Time Bandits" with the
horses crashing through the kids bedroom wall. I love this flick! Ric
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