Date: Tue, 18 Nov 2014 16:36:32 -0800 From: John-Mark Gurney <jmg@funkthat.com> To: Slawa Olhovchenkov <slw@zxy.spb.ru> Cc: "weh@microsoft.com >> Wei Hu" <weh@microsoft.com>, kyliel@microsoft.com, huishao@microsoft.com, "Jun Fang \(Wicresoft\)" <v-jufang@microsoft.com>, re <re@freebsd.org>, "freebsd-arch@FreeBSD.org Arch" <freebsd-arch@freebsd.org>, d@delphij.net Subject: Re: kernel linker: Overriding a driver shipped with kernel via module? Message-ID: <20141119003632.GN24601@funkthat.com> In-Reply-To: <20141119002718.GP9763@zxy.spb.ru> References: <546A8191.3090208@delphij.net> <20141118124544.GA95731@zxy.spb.ru> <20141119001510.GM24601@funkthat.com> <20141119002718.GP9763@zxy.spb.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
Slawa Olhovchenkov wrote this message on Wed, Nov 19, 2014 at 04:27 +0400:
> On Tue, Nov 18, 2014 at 04:15:10PM -0800, John-Mark Gurney wrote:
>
> > Slawa Olhovchenkov wrote this message on Tue, Nov 18, 2014 at 16:45 +0400:
> > > On Mon, Nov 17, 2014 at 03:15:29PM -0800, Xin Li wrote:
> > >
> > > > Right now one can declare version for a module by doing something like:
> > > >
> > > > MODULE_VERSION(module_name, module_version);
> > > >
> > > > Sometimes, it may be desirable for a vendor to release a new driver
> > > > that overrides the driver shipped with the kernel itself. However, it
> > > > seems that the MODULE_VERSION facility would just refuse the module
> > > > when preloaded with kernel.
> > > >
> > > > Looking at some other vendor drivers, they are using a slightly
> > > > different module name to overcome this limitation. Is that the only
> > > > way to do it?
> > >
> > > I think now time to move to modulated kernel and load all drivers
> > > currently present in GENERIC as modules (via loader.conf).
> >
> > This becomes slightly more difficult for storage drivers which must
> > be loaded at boot time so the you can mount root from it... But yes,
> > we are interested in methods to make it easier/more automatic for
> > modules to be loaded to support the hardware that is present in a
> > system...
>
> When loader can load kernel -- loader can load driver module, this is
> not Linux (but yes, loader need plugable and stackable framework for
> access FS -- currenly booting from ZFS over gstripe not allowed).
That isn't the only issue.. another issue is identifing the correct
kernel module(s) to load at boot... iirc, you cannot unload a kernel
module loaded at boot time...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20141119003632.GN24601>