Serial Port issue

w0und3d · 03-16-2005, 12:32 AM

Hi there,

I have this strange problem on Mandy 10.1 - my serial ports are not installed - and in /messages i get the following error "..kernel: serial8250: too much work for irq10"

I have checked MCC and my serial ports are not installed, i am using a hp Compaq nx9010 laptop. i compiled the new kernel 2.6.11.2 - so that i can get my usb keyboard to work, which it is now... but now my serial ports are missing...

anybody tell me what i can do? to fix...the logs are getting full and filling up "/" - please help!

thanks!

straytech · 03-16-2005, 12:57 AM

Go into the bios on your laptop and set the com ports to
com1:3F8 irq 4
OR
com2:2F8 irq 3
You probably only have one on the laptop but if there are two disable the 2nd one unless you need it.
Reboot.
Use whatever to redetect serial ports, something like kudzu or reinstall them manually.

w0und3d · 03-16-2005, 02:25 AM

hiya,

i checked the bios, you cannot set anything manual or enable or disbable....

opjose · 03-16-2005, 11:14 AM

Usually this occurs because IRQ routing is not enabled.

In turn IRQ routing (the ability of the os to remap IRQ assignments) depends upon acpi and or apic...

The default for Mandrake is to DISABLE ACPI/APIC using a kernel parameter.

You'll need to edit /etc/lilo.conf and remove the offending entry...

e.g. remove JUST acpi=ht and/or noapic or nolapic

Then reboot.

Also in the bios set PNP OS = NO which also will help.

w0und3d · 03-17-2005, 12:20 AM

Hiya,

I checked lilo.conf and acpi=on - when i compiled the kernel i made sure that ACPI gets installed, as i have a notebook, and for power management you need it.

in the BIOS i don't have that option...

opjose · 03-17-2005, 09:44 AM

Try disabling at least one of the serial ports in the bios and see what happens. Preferably disable the second port (com2).

w0und3d · 03-17-2005, 01:32 PM

hiya,

my laptop only has 1 serial, and you cannot enable / disable or make any IO/IRQ changes to it...I saw as well that the parallel port is also not installed...

opjose · 03-17-2005, 02:39 PM

Eh, no not quite...

I'll bet your laptop has an IRDA port right?

That's a serial port...

Try disabling it. Then make the remaining port COM1 in terms of it's configuration...

w0und3d · 03-18-2005, 05:33 AM

yeah it does...

just wanna make sure of the command "rmmod irda" < that should remove irda and remove the service from starting up?

opjose · 03-18-2005, 12:22 PM

Eh, no.

chkconfig --del irda

Will stop the service, but this does not prevent the modules from loading...

1) Check /etc/sysconfig/irda and make sure it points to the CORRECT port for your IRDA device.

2) lsmod | more to see the installed modules... if any ir related modules are installed, try rmmod'ing them from memory then look in /etc/modules.conf /etc/modules.preload if anything is being loaded at boot.

If so comment out these lines...

3) You may also have to generate a new mkinitrd boot image as well...

w0und3d · 03-22-2005, 01:59 AM

hiya,

1 - its poiting to COM2 - which is fine as my laptop only has 1 Serial Com port
2 - lsmod - found nothing - checking /etc/modules = blank, /etc/modules.conf = lines regarding HSF Modem, nothing to do with IRDA
3 - didnt do this

kinda strange though - i will remove the hsf modules and see if that also helps...

thanks for the help so far....