linux-kernel - Re: [PATCH 2/5] arm64, thunder: Add initial dts for Cavium Thunder SoC

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Date:	Fri, 1 Aug 2014 19:04:11 +0200
From:	Robert Richter <rric@...nel.org>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Ganapatrao Kulkarni <gpkulkarni@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>, Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Robert Richter <rrichter@...ium.com>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Radha Mohan Chintakuntla <rchintakuntla@...ium.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, leif.lindholm@...aro.org
Subject: Re: [PATCH 2/5] arm64, thunder: Add initial dts for Cavium Thunder
 SoC

Mark,

On 31.07.14 12:33:01, Mark Rutland wrote:
> On Thu, Jul 31, 2014 at 12:12:33PM +0100, Ganapatrao Kulkarni wrote:
> >    We mark RAM used by ATF as secure-RAM, however we don't support
> >    secure/non-secure address aliasing.
> >    i.e, a DRAM address that can be referenced from both a secure PA and a
> >    non-secure PA is not allowed.
>
> What exactly do you mean by "not allowed"?

It actually means "not possible" since secure and non-secure memory is
kept in separate address ranges.

> If Linux maps that memory, what happens?
>
> What if Linux tried to read or write to it?
>
> If Linux should not map that memory, it should not be described in the
> memory map to begin with.

Linux never will see secure-RAM. Firmware must be sure to report the
correct non-secure memory ranges to the OS (e.g. unsecure mem size =
total size - secure mem size).

-Robert
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