Modules and Buses

[Alexandr Rybalko]

On Mon, 23 Aug 2010 22:12:59 -0600 (MDT)
"M. Warner Losh" <imp at bsdimp.com> wrote:

>> In message: <20100819170643.38362078.ray at dlink.ua>
>>             Alexandr Rybalko <ray at dlink.ua> writes:
>> : On Thu, 19 Aug 2010 09:18:46 -0400
>> : John Baldwin <jhb at freebsd.org> wrote:
>> : 
>> : >> On Thursday, August 19, 2010 8:38:05 am Alexandr Rybalko wrote:
>> : >> > Hi all,
>> : >> > 
>> : >> > Can someone say, how `make` in sys/modules dir can obtain available buses.
>> : >> > I try to make clean version of bfe, that can be for PCI bus or can be part 
>> : >> of SoC (like BCM5354) on SSB bus.
>> : >> > So for proper module building I need to know what bus interface I must build 
>> : >> if_bfe_pci.c, or if_bfe_siba.c, or both?
>> : >> 
>> : >> You can always include both buses.  If a bus driver isn't present in the 
>> : >> kernel the attachment will just never be invoked.
>> : 
>> : I was afraid of such response. Now I have to rewrite siba implementation to newbus :)
>> : Thanks you for answer! 
>> 
>> In the module building system (modules built with sys/modules
>> Makefiles), we generally include all relevant busses.  So, for i386 we
>> include EISA front ends for some devices, but omit that on amd64.  For
>> siba, you'd only include it on mips, since that's the only platform
>> where this would be relevant (I know broadcom wireless drivers are
>> implemented via a pci <-> siba bridge, but that's a really special
>> case).
>> 
>> Check out sys/modules/ep for an example from the mists of history..
>> 
>> Warner

Thanks you Warner,

I believe Broadcom wifi cards not last instance of Broadcom devices with PCI-to-SSB bridge.
Since this is modular platform that can join multiple already existence chips onto biggest chip.
And SSB is spacial case of OCP bus, who can be used not only for MIPS periphery, but ARM too.

So I think I should implement the SSB as a full functional bus.

Thanks again.

-- 
Alexandr Rybalko <ray at dlink.ua> 
aka Alex RAY <ray at ddteam.net>