linux-kernel - Re: How to compile module params into kernel?

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Date:	Wed, 8 Nov 2006 15:59:44 -0500
From:	"Richard B. Johnson" <jmodem@...minableFirebug.com>
To:	"Joakim Tjernlund" <joakim.tjernlund@...nsmode.se>,
	"'Jesper Juhl'" <jesper.juhl@...il.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: How to compile module params into kernel?

----- Original Message ----- 
From: "Joakim Tjernlund" <joakim.tjernlund@...nsmode.se>
To: "'Jesper Juhl'" <jesper.juhl@...il.com>
Cc: <linux-kernel@...r.kernel.org>
Sent: Wednesday, November 08, 2006 3:02 PM
Subject: RE: How to compile module params into kernel?


>> -----Original Message-----
>> From: Jesper Juhl [mailto:jesper.juhl@...il.com]
>>
>> On 08/11/06, Joakim Tjernlund <joakim.tjernlund@...nsmode.se> wrote:
>> > Instead of passing a module param on the cmdline I want to
>> compile that
>> > into
>> > the kernel, but I can't figure out how.
>> >
>> > The module param I want compile into kernel is
>> > rtc-ds1307.force=0,0x68
>> >
>> > This is for an embeddet target that doesn't have loadable module
>> > support.
>> >
>> You could edit the module source and hardcode default values.
>>
>
> Yes, but I don't want to do that since it makes maintance
> harder.
>
> Jocke
>
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If you don't have a module, you can not use module parameters. However, it 
might even be simpler...
You just put your parameters (strings to parse) on the kernel command-line 
and you put code in your driver to interpret them.

You want to look at "saved_command_line." It is a string as:
extern char saved_command_line[COMMAND_LINE_SIZE];
You need to parse ASCII text yourself, in your driver, but it's trivial. 
Look at .../arch/i386/kernel/setup.c parse_cmdline_early().
I don't see anywhere in the kernel that it gets overwritten so it should be 
good to use.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.24 (somewhere). IT removed email  for 
engineers!
New Book: http://www.AbominableFirebug.com




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