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    SubjectRe: [PATCH TIP 02/14] x86: Add device tree support
    On Mon, Jan 24, 2011 at 09:58:50AM +0530, Sebastian Andrzej Siewior wrote:
    > This patch adds minimal support for device tree support on x86. It will
    > be passed to the kernel via setup_data which requires atleast boot
    > protocol 2.09.
    > Memory size, restricted memory regions, boot arguments are gathered the
    > traditional way so things like cmd_line are just here to let the code
    > compile.
    > The current plan is use the device tree as an extension and to gather
    > informations from it which can not be enumerated and have to be
    > hardcoded otherwise. This includes things like
    > - which devices are on this I2C/ SPI bus?
    > - how are the interrupts wired to IO APIC?
    > - where could my hpet be?
    >
    > Cc: devicetree-discuss@lists.ozlabs.org
    > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
    > Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
    > ---
    [...]
    > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    > index d5ed94d..5d21095 100644
    > --- a/arch/x86/Kconfig
    > +++ b/arch/x86/Kconfig
    > @@ -297,6 +297,13 @@ config X86_BIGSMP
    > ---help---
    > This option is needed for the systems that have more than 8 CPUs
    >
    > +config X86_OF
    > + bool "Support for device tree"
    > + select OF
    > + select OF_EARLY_FLATTREE
    > + ---help---
    > + Device tree support on X86.
    > +

    On ARM and MIPS, this is called 'config USE_OF'. It would be nice to have
    some commonality. Maybe I should move the user-visible option to
    drivers/of/Kconfig. Or perhaps I should just make CONFIG_OF itself
    user visible.

    thoughts?

    g.


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