Re: pcf module problem

From: Milan Obuch <current_at_dino.sk>
Date: Fri, 14 Oct 2005 06:51:53 +0200
On Thursday 13 October 2005 21:51, John Baldwin wrote:
> On Thursday 06 October 2005 07:21 am, Milan Obuch wrote:

...

> > Then I checked pcf module and found the same behavior. If you have no
> > 'device iicbus' in kernel configuration, issuing 'kldload pcf' gives
> > link_elf: symbol iicbus_intr undefined
> > kldload: can't load pcf: No such file or directory.
> >
> > Adding 'device iibus' into kernel configuration and rebuilding kernel
> > fixes this, so it looks like symbol is just not exported.
> >

...

> >
> > Anyway, is anybody out there using pcf? There is some work done in this
> > area, but not yet linked into main tree. I have not pcf hardware, so I
> > can not test anything in this area, but it would be good to make the
> > transition from older i386/isa/pcf.c to new dev/pcf/...
>
> Sounds like it is missing a 'MODULE_DEPEND(iicbus, 1, 1, 1);' line.  Can
> you try adding one and seeing if it fixes the kldload of pcf?

Bingo!

Actually, it is 'MODULE_DEPEND(pcf_isa, iicbus, 1, 1, 1);', at least with 
6.0-RC1, after looking elsewhere I added 'MODULE_VERSION(pcf_isa, 1);' as 
well. Those ones are not written literally at other places, but nevertheless, 
this works.

Still, transition from 'sys/i386/isa/pcf.c' to '/sys/dev/pcf/*' solves this 
isue as well, because there it is already fixed.

With Makefile changed to

.PATH:          ${.CURDIR}/../../../../dev/pcf
KMOD            = pcf
SRCS            = device_if.h bus_if.h iicbus_if.h isa_if.h \
                  pcf.c pcf_isa.c

.include <bsd.kmod.mk>

it just works. I changed directly Makefile 
in /sr/src/sys/modules/i2c/controllers/pcf, just for test, so maybe this is 
not enough, however, it works.

So, the question remains - is anybody out there using pcf devices to confirm 
this really works? For me it compiles and kldloads, but I have no real device 
to test real functionality.

And the other question - is anybody out there using i2c devices at all? If so, 
I would like to hear about their experiences. This area seems to be not 
covered anywhere. Googling for 'freebsd i2c' and similar does not reveal 
anything interesting for me...

Milan
Received on Fri Oct 14 2005 - 02:52:44 UTC

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