linux-kernel - Re: [PATCHv2 1/2] ARM: mx51: Implement code to allow mx51 to enter WFI

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Date:	Thu, 10 Mar 2011 14:37:15 +0100
From:	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
To:	David Jander <david.jander@...tonic.nl>
Cc:	Nguyen Dinh-R00091 <R00091@...escale.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	Zhang Lily-R58066 <R58066@...escale.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vaidyanathan Ranjani-RA5478 <RA5478@...escale.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
	Arnaud Patard <arnaud.patard@...-net.org>
Subject: Re: [PATCHv2 1/2] ARM: mx51: Implement code to allow mx51 to enter
 WFI

Hi David,

On Tue, Mar 08, 2011 at 12:40:23PM +0100, David Jander wrote:
> 
> Hi Sascha,
> 
> On Mon, 7 Mar 2011 19:07:00 +0100
> "s.hauer@...gutronix.de" <s.hauer@...gutronix.de> wrote:
> >[...]
> > > The current imx for-next tree is not booting on my Babbage board. Is
> > > it okay for you with your HW. I'll have to debug the booting part
> > > first.
> > 
> > Probably because other than kconfig states i.MX51 and i.MX53 cannot be
> > compiled in one kernel. the for-next branch boots fine on my babbage.
> 
> Would you mind explaining (or pointing to an explanation) as to why this is
> not supposed to work? Given the high level of compatibility between MX51 and
> MX53, I'd say there must be a very good reason not to enable a single binary
> kernel for both. Or is this just temporary brokenness?

i.MX51 and i.MX53 have different phys_offsets. Look at
arch/arm/mach-mx5/Makefile.boot:

   zreladdr-$(CONFIG_ARCH_MX50) := 0x70008000
params_phys-$(CONFIG_ARCH_MX50) := 0x70000100
initrd_phys-$(CONFIG_ARCH_MX50) := 0x70800000
   zreladdr-$(CONFIG_ARCH_MX51) := 0x90008000
params_phys-$(CONFIG_ARCH_MX51) := 0x90000100
initrd_phys-$(CONFIG_ARCH_MX51) := 0x90800000
   zreladdr-$(CONFIG_ARCH_MX53) := 0x70008000
params_phys-$(CONFIG_ARCH_MX53) := 0x70000100
initrd_phys-$(CONFIG_ARCH_MX53) := 0x70800000

Compiling a kernel for i.MX50 and i.MX53 will work, but compiling a
kernel for i.MX51 and i.MX53 will and up with a kernel assuming SDRAM
at 0x70000000 which will fail on a i.MX51. We need
phys_to_virt/virt_to_phys runtime patching to get this right. This
will be merged in the next merge window.

Sascha

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