Re: How to compile module params into kernel?

[Richard B. Johnson]

----- Original Message ----- 
From: "Joakim Tjernlund" <joakim.tjernlund@xxxxxxxxxxxx>
To: "'Jesper Juhl'" <jesper.juhl@xxxxxxxxx>
Cc: <linux-kernel@xxxxxxxxxxxxxxx>
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@xxxxxxxxx]
> >
> > On 08/11/06, Joakim Tjernlund <joakim.tjernlund@xxxxxxxxxxxx> 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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