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Old 01-04-2005, 12:10 AM   #1
icpsvt
LQ Newbie
 
Registered: Oct 2004
Posts: 23

Rep: Reputation: 15
Editing default module parameters at boot time


Hi. Again.

I have a TvTuner card that uses the module bttv.

At boot time it loads it fine, but the module needs 2 extra parameters to run properly.

How do I pass those to it?

It loads
bttv
It needs to load
bttv card=10 tuner=10

I know I can rmmod it out and then modprobe it back in, but that seems like a real ugly hack
Any ideas?

Thanks,
Jason
 
Old 01-04-2005, 03:38 AM   #2
jacks4u
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Registered: Dec 2004
Location: Phoenix, Arizona, USA
Distribution: Debian, RedHat, ???
Posts: 56

Rep: Reputation: 15
You do not say which Kernel you are using. This is important, as the kernel passes parameters to each module at boot time.

Read the file in your kernel source tree ./Documentation/kernel-parameters.txt

After finding the proper parameters to send to a module, you can edit the GRUB or LILO config to send those parameters to your module, eliminating the need to re-initialize the module with the proper parameters.

For my kernel (2.4.26) the bttv setup would look like this in /etc/lilo.conf
Code:
image=/vmlinuz
        append="bttv.card=10 bttv.tuner=10"
        initrd=/initrd.img
        label=Linux
        read-only
I do not use GRUB, so you would have to read the man pages for the equivelent with that boot loader. Or, perhaps someone else here can explain how GRUB is configured to handlle kernel module parameters

A note of Caution: I do not know if the module options are the same for all kernels, or if 2.6 kernels have a different syntax - you should read the above mentioned file for your kernel, to discover the module options that ae rigt for your hardwae and kernel version!


Hope this helps :=)

jacks4u
 
Old 02-11-2006, 07:00 PM   #3
ka9qlq
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Registered: Feb 2004
Location: Columbus, IN USA
Distribution: Mepis 3.4 rc1
Posts: 112

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For me I wrote a bash script like this

#!/bin/bash
#Look out! We be programming!
# copyright ka9qlq
rmmod bttv
bttv card=10 tuner=10

Then symlink it to /etc/rc5.d/S99bttv
 
Old 02-11-2006, 07:03 PM   #4
ka9qlq
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Registered: Feb 2004
Location: Columbus, IN USA
Distribution: Mepis 3.4 rc1
Posts: 112

Rep: Reputation: 15
Corection

#!/bin/bash
#Look out! We be programming!
# copyright ka9qlq
rmmod bttv
modprobe bttv card=10 tuner=10

Alvin
 
  


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