I am looking for the cause of an oops (more info
to come in another message) and I noticed the following
anomaly. I am using a modular serial driver on /dev/ttyS0
and /dev/ttyS1 (actually /dev/tts/0 and /dev/tts/1 under
devfs). See the listing of my /proc/interrupts below.
I am not using /dev/ttyS0 at the moment, so IRQ4 isn't listed
as used. I assume that's normal. But I do have /dev/ttyS1
open; it uses IRQ3. But note that the name of the serial
driver is not printed in the list. Why not?
root@thanatos:~# cat /proc/interrupts
CPU0
0: 65078 XT-PIC timer
1: 1546 XT-PIC keyboard
2: 0 XT-PIC cascade
3: 1979 XT-PIC
5: 3324 XT-PIC CS4231
7: 4 XT-PIC parport0
8: 1 XT-PIC rtc
10: 27 XT-PIC mwave_3780i
11: 5021 XT-PIC usb-uhci, Texas Instruments PCI1250, Texas Instruments PCI1250 (#2)
12: 3268 XT-PIC PS/2 Mouse
14: 8807 XT-PIC ide0
15: 4 XT-PIC ide1
NMI: 0
ERR: 0
Fishy!
--
Thomas Hood
jdthood_AT_yahoo.co.uk
From: "Thomas Hood" <[email protected]>
> I am not using /dev/ttyS0 at the moment, so IRQ4 isn't listed
> as used. I assume that's normal. But I do have /dev/ttyS1
That is normal. serial.c unregisters the irq if it's no longer
needed.
> open; it uses IRQ3. But note that the name of the serial
> driver is not printed in the list. Why not?
>
> 3: 1979 XT-PIC
If you have it open, it should appear.
> Fishy!
Indeed.
..Stu