linux-kernel - Re: [PATCH] arm/tegra: select AUTO

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Message-ID: <20111014071500.GP21648@n2100.arm.linux.org.uk>
Date:	Fri, 14 Oct 2011 08:15:00 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Olof Johansson <olof@...om.net>
Cc:	Stephen Warren <swarren@...dia.com>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"Colin Cross (ccross@...roid.com)" <ccross@...roid.com>,
	Erik Gilling <konkers@...roid.com>,
	"Arnd Bergmann (arnd@...db.de)" <arnd@...db.de>
Subject: Re: [PATCH] arm/tegra: select AUTO_ZRELADDR by default

On Thu, Oct 13, 2011 at 04:38:46PM -0700, Olof Johansson wrote:
> Hi,
> 
> On Wed, Sep 28, 2011 at 10:50 AM, Stephen Warren <swarren@...dia.com> wrote:
> > Peter De Schrijver wrote at Tuesday, September 27, 2011 7:08 PM:
> >> This patch causes the kernel uncompressor to determine the physical address
> >> of the SDRAM at runtime. This allows the kernel to boot on both tegra20 and
> >> tegra30 even though SDRAM is at different physical addresses on both SoCs.
> >>
> >> Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
> >
> > An alternative would be to simply add that config option to the relevant
> > defconfig/.config file. I see both cases in use in the kernel. Still, the
> > code change this enables looks fine to just turn on all the time, and will
> > be needed for Tegra30 support, so I'm fine just selecting it as you have.
> >
> > Acked-by: Stephen Warren <swarren@...dia.com>
> >
> >> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> >> index 472a7f8..474737b 100644
> >> --- a/arch/arm/Kconfig
> >> +++ b/arch/arm/Kconfig
> >> @@ -596,6 +596,7 @@ config ARCH_TEGRA
> >>       select HAVE_CLK
> >>       select HAVE_SCHED_CLOCK
> >>       select ARCH_HAS_CPUFREQ
> >> +     select AUTO_ZRELADDR
> >>       help
> >>         This enables support for NVIDIA Tegra based systems (Tegra APX,
> >>         Tegra 6xx and Tegra 2 series).
> >
> > P.S. Since this patch relates to Tegra, you should CC the Tegra maintainers
> > and list; I've done so on this message. I also added Arnd; he might take
> > this through the arm-soc tree.
> 
> While it does touch a file outside of arch/arm/mach-tegra, it's for
> the tegra options and is not likely to cause conflicts upstream. I'll
> apply it with the rest of tegra patches for 3.2 here.
> 
> So: Applied, thanks.

I'll point out that this makes Tegra incompatible with ZBOOT_ROM, which
can still be enabled.  ZBOOT_ROM=y AUTO_ZRELADDR=y is an invalid
configuration at runtime.
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