[PATCH 2/2] ARM: allow for ATAGS to be configured out when DT support is selected
Nicolas Pitre
nicolas.pitre at linaro.org
Tue Sep 4 12:56:26 EST 2012
On Sat, 1 Sep 2012, Arnd Bergmann wrote:
> On Thursday 30 August 2012, Nicolas Pitre wrote:
> > Now that ATAGS support is well contained, we can easily remove it from
> > the kernel build if so desired. It has to explicitly be disabled, and
> > only when DT support is selected.
> >
> > Note: disabling kernel ATAGS support does not prevent the usage of
> > CONFIG_ARM_ATAG_DTB_COMPAT.
>
> > ...
>
> > +config ATAGS
> > + bool "Support for the traditional ATAGS boot data passing" if USE_OF
> > + default y
> > + help
> > + This is the traditional way of passing data to the kernel at boot
> > + time. If you are solely relying on the flattened device tree (or
> > + the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
> > + to remove ATAGS support from your kernel binary. If unsure,
> > + leave this to y.
>
> That's a clever way of implementing it, I had not though of making it an
> optional default-y symbol.
>
> Acked-by: Arnd Bergmann <arnd at arndb.de>
Thanks.
> Should we do patches to the individual platforms bsaed on this to disable
> the ATAG based board files when CONFIG_ATAG is disabled?
Well... that could be a good thing to make them depend on ATAGS indeed.
But that can be done incrementally in later patches.
Nicolas
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