Re: How to compile module params into kernel?

From: Miguel Ojeda
Date: Wed Nov 08 2006 - 15:16:55 EST


On 11/8/06, Jesper Juhl <jesper.juhl@xxxxxxxxx> wrote:
On 08/11/06, Joakim Tjernlund <joakim.tjernlund@xxxxxxxxxxxx> wrote:
> > -----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.
>
Well, as far as I know, there's no way to specify default module
options at compile time. The defaults are set in the module source and
are modifiable at module load time or by setting options on the kernel
command line at boot tiem. So, if that's no good for you I don't see
any other way except modifying the source to hardcode new defaults.


You can add parameter values at Kconfig using "int", "hex"... instead
of tristate, and then do something like:

static unsigned int foo = CONFIG_foo;
module_param(foo, uint, S_IRUGO);
MODULE_PARM_DESC(foo, "foo value (uint)");
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