linux-kernel - Re: [PATCH v2 04/31] arm64: MMU definitions

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Message-ID: <20120817093822.GV11011@atomide.com>
Date:	Fri, 17 Aug 2012 02:38:22 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Will Deacon <Will.Deacon@....com>
Subject: Re: [PATCH v2 04/31] arm64: MMU definitions

* Catalin Marinas <catalin.marinas@....com> [120817 02:21]:
> On Fri, Aug 17, 2012 at 10:04:52AM +0100, Tony Lindgren wrote:
> > * Catalin Marinas <catalin.marinas@....com> [120814 10:57]:
> > > The virtual memory layout is described in
> > > Documentation/arm64/memory.txt. This patch adds the MMU definitions for
> > > the 4KB and 64KB translation table configurations. The SECTION_SIZE is
> > > 2MB with 4KB page and 512MB with 64KB page configuration.
> > > 
> > > PHYS_OFFSET is calculated at run-time and stored in a variable (no
> > > run-time code patching at this stage).
> > 
> > Care to clarify this part a bit? Is the memory standardized somehow
> > now and not needed? Or do we still need to add that for various SoCs
> > later on?
> 
> The memory is not standardised but we have FDT to fully specify it. The
> PHYS_OFFSET does not need to be defined, it is automatically detected at
> boo-time based on the kernel load address and stored in a variable to be
> used later.

OK nice thanks.

Tony
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