Date: Tue, 13 Apr 1999 02:45:56 +0800 From: Peter Wemm <peter@netplex.com.au> To: Doug Rabson <dfr@nlsystems.com> Cc: Tomoaki NISHIYAMA <tomoaki@biol.s.u-tokyo.ac.jp>, y-nakaga@nwsl.mesh.ad.jp, mike@smith.net.au, dcs@newsguy.com, nate@mt.sri.com, faber@ISI.EDU, nsayer@quack.kfu.com, freebsd-mobile@FreeBSD.ORG Subject: Re: Any success with CirrusLogic 6729/6730??? Message-ID: <19990412184558.2CB331F4F@spinner.netplex.com.au> In-Reply-To: Your message of "Mon, 12 Apr 1999 19:20:54 %2B0100." <Pine.BSF.4.05.9904121917570.74823-100000@herring.nlsystems.com>
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Doug Rabson wrote:
> On Mon, 12 Apr 1999, Tomoaki NISHIYAMA wrote:
> > dfr> This is not correct. A driver can be trivially split up into attachme
nt
> > dfr> points and implementations. The interface definition system can actua
lly
> > dfr> make this easier (IMHO of course). The mcclock driver in FreeBSD/alph
a
> > dfr> (derived from the NetBSD driver) does this.
> > More precicely, is the split driver *dynamically* loadable?
> > The bus independent part, mcclock.c seemes to be linked statically,
> > putting aside whethere there is any merit to load the clock dynamically.
>
> A split driver can be dynamically loaded by using the dependancy mechanism
> on the KLD modules. Imagine a device foo which support pci and isa
> attachments. One could build three modules:
>
> foo.ko containing the core driver functionality
> foo_isa.ko probe/attach for isa bus
> foo_pci.ko probe/attach for pci bus
>
> The two bus-specific modules would depend on the foo.ko module ensuring
> that it is loaded automatically if either bus-specific module is used.
Of course, it can go in one module or component as well, for example:
/*
* ISA can be attached to a PCI-ISA bridge or directly to the nexus.
*/
DRIVER_MODULE(isa, isab, isa_driver, isa_devclass, 0, 0);
DRIVER_MODULE(isa, nexus, isa_driver, isa_devclass, 0, 0);
Cheers,
-Peter
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