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Old 05-07-2004, 08:50 AM   #1
Registered: Apr 2004
Distribution: RedHat, Fedora, Suse, Debian, Gentoo, Mandrake
Posts: 132

Rep: Reputation: 15

i need a clear example of #setserial command when assigning an IRQ (from an expert)
...may useing {lspci ,cat /proc/pci } and this stuff after i cat/proc/pci |grep -i irq ..when i'm on the net i see
IRQ 11.
IRQ 9.
IRQ 11.
IRQ 11.
IRQ 11.
IRQ 5.
IRQ 11.
IRQ 11.
is that means that there r 6 devices using the same IRQ 11 ?..
this is a RedHat~9 on Thinkpad laptop internal +external modem +network card ) and this mess happend after recompiling 2.4..20-8 kernel to apply Quota the custom kernel wont let the modems or the network card working) the old one sometimes work if the /dev/modem linked right ....
So if anyOne tryed this command before post it or any have a link to good exampl not just man pages ,,,,,,,,,
I want to edit my IRQ~s map ..safely..
thank you

Last edited by ziox; 05-07-2004 at 09:20 AM.
Old 05-07-2004, 12:01 PM   #2
Registered: Jul 2003
Distribution: Slackware
Posts: 389

Rep: Reputation: 52
Yes, you have six devices using IRQ 11, but that's not necessarily a problem; IRQs can be shared on the PCI bus (but can't be shared across both ISA and PCI busses). Even so, IRQ sharing should be avoided if possible.

To see all interrupts and ioports:
$ cat /proc/interrupts
$ cat /proc/ioports

although sometimes things won't show up in /proc/interrupts if that piece of hardware hasn't issued an interrupt.

Here's an example of setserial:

#setserial /dev/ttyS0 port 0x02e8 irq 3 baud_base 115200

If you ever forget, run setserial with the -G option on any serial port to get an example of how to use it:

# setserial -G /dev/ttyS0
/dev/ttyS0 uart 16550A port 0x03f8 irq 4 baud_base 115200 spd_normal skip_test is really good. The Serial-HOWTO is where I learned everything I know about serial ports.

Hope this helps,
1 members found this post helpful.
Old 05-07-2004, 05:59 PM   #3
Registered: Apr 2004
Distribution: RedHat, Fedora, Suse, Debian, Gentoo, Mandrake
Posts: 132

Original Poster
Rep: Reputation: 15
thank you ..
you are really helpfull


linux, serial, uart

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