linux-kernel - Re: [patch, 2.6.26-rc2] dvb: drivers/media/dvb/ttpci/fdump firmware build error fix

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Date:	Wed, 14 May 2008 01:49:47 +0200
From:	Oliver Endriss <o.endriss@....de>
To:	Johannes Stezenbach <js@...uxtv.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Andrew de Quincey <adq_dvb@...skialf.net>
Subject: Re: [patch, 2.6.26-rc2] dvb: drivers/media/dvb/ttpci/fdump firmware build error fix

Johannes Stezenbach wrote:
> On Tue, May 13, 2008 at 06:42:38PM +0200, Ingo Molnar wrote:
> > 
> > * Johannes Stezenbach <js@...uxtv.org> wrote:
> > 
> > > On Tue, May 13, 2008 at 04:33:54PM +0200, Oliver Endriss wrote:
> > > > Johannes Stezenbach wrote:
> > > > > You can put PREVENT_FIRMWARE_BUILD=y in your allrandom.config.
> > > > 
> > > > Sure. And without the patch you can simply add
> > > > - STANDALONE=y or
> > > > - DVB_AV7110_FIRMWARE=n
> > > > to your allrandom.config. ;-)
> > > 
> > > It is desirable to have one generic "don't break the build because of 
> > > missing firmware binaries" option, isn't it?
> > 
> > it's a bit confusing. PREVENT_FIRMWARE_BUILD=y is the 'weaker' option - 
> > a driver might still be operational (with its default firmware), even if 
> > no firmware is built. STANDALONE=y is the stronger option - if a driver 
> > depends on that it means that the driver cannot be built (and used) at 
> > all without a firmware file. To be on the safe side users who have no 
> > firmware needs should set both options. (and that's the default as well)
> 
> Seems like I'm confused now...
> 
>   CONFIG_STANDALONE
>     Prompt: Select only drivers that don't need compile-time external firmware
> 
>   PREVENT_FIRMWARE_BUILD
>     Prompt: Prevent firmware from being built

After reading the text again I still think that my understanding is
correct [1].

CONFIG_STANDALONE disables drivers which require a firmware file at
compile-time. av7110 with DVB_AV7110_FIRMWARE=y is this kind of driver.

PREVENT_FIRMWARE_BUILD controls building (= compiling) the firmware from
source. As we do not ship the source of the av7110 firmware, this option
does not apply.

So everything should be fine 'as is'.

CU
Oliver

Notes:
[1] Of course, I am open to corrections from the kbuild gurus. ;-)

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