linux-kernel - Re: [v4l-dvb-maintainer] DVB build fails without I2C

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Date:	Sat, 09 Sep 2006 19:13:51 +0400
From:	Manu Abraham <abraham.manu@...il.com>
To:	Jeff Garzik <jeff@...zik.org>
CC:	v4l-dvb-maintainer@...uxtv.org, Andrew Morton <akpm@...l.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [v4l-dvb-maintainer] DVB build fails without I2C

Jeff Garzik wrote:
> In an effort to speed up my all-filesystems build, I disabled several
> things in my allyesconfig-generated .config.  As luck would have it, I
> wound up disabling I2C but did not disable DVB.
> 
> This led to a link failure at the end of the build, with the linker
> complaining that many I2C-related symbols were not present.
> 
> Recommended solution:  Add I2C as a dependency (or select) in DVB Kconfig.


DVB-CORE does not depend on I2C, since it does not rely on any I2C at
all. (DVB-CORE can use other methods) It is the PCI bridges that depend
on I2C. IIRC, we had a patch adding I2C dependencies for the Kconfig for
the relevant bridge chips. The frontends which are connected to the
bridges, depend on DVB-Core and I2C. So that dependency exists.

frontends foo
depends on DVB_CORE && I2C

pci bridges foo
depends on DVB_CORE && I2C && PCI

Maybe that patch has not made it yet to mainline.


Manu
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