linux-kernel - Re: [PATCH 1/4] arm64: dts: Reserve memory regions for hi6220

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Date:	Fri, 9 Oct 2015 08:17:16 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Leo Yan <leo.yan@...aro.org>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Bintian Wang <bintian.wang@...wei.com>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Wei Xu <xuwei5@...ilicon.com>,
	Yiping Xu <xuyiping@...ilicon.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	Tyler Baker <tyler.baker@...aro.org>
Subject: Re: [PATCH 1/4] arm64: dts: Reserve memory regions for hi6220

On Thu, Oct 8, 2015 at 11:36 PM, Leo Yan <leo.yan@...aro.org> wrote:
> On Hi6220, below memory regions in DDR have specific purpose:
>
>   0x05e0,0000 - 0x05ef,ffff: For MCU firmware using at runtime;
>   0x06df,f000 - 0x06df,ffff: For mailbox message data;
>   0x0740,f000 - 0x0740,ffff: For MCU firmware's section;
>   0x3e00,0000 - 0x3fff,ffff: For OP-TEE.
>
> This patch reserves these memory regions in DT.
>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> ---
>  arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> index e36a539..e3f4cb3 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> +++ b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> @@ -7,9 +7,6 @@
>
>  /dts-v1/;
>
> -/*Reserved 1MB memory for MCU*/
> -/memreserve/ 0x05e00000 0x00100000;
> -

Why does memreserve not work for you? You can have multiple entries.

>  #include "hi6220.dtsi"
>
>  / {
> @@ -24,8 +21,19 @@
>                 stdout-path = "serial0:115200n8";
>         };
>
> +       /*
> +        * Reserve below regions from memory node:
> +        *
> +        *  - 0x05e0,0000 - 0x05ef,ffff: MCU firmware runtime using
> +        *  - 0x06df,f000 - 0x06df,ffff: Mailbox message data
> +        *  - 0x0740,f000 - 0x0740,ffff: MCU firmware section
> +        *  - 0x3e00,0000 - 0x3fff,ffff: OP-TEE
> +        */
>         memory@0 {
>                 device_type = "memory";
> -               reg = <0x0 0x0 0x0 0x40000000>;
> +               reg = <0x00000000 0x00000000 0x00000000 0x05e00000>,
> +                     <0x00000000 0x05f00000 0x00000000 0x00eff000>,
> +                     <0x00000000 0x06e00000 0x00000000 0x0060f000>,
> +                     <0x00000000 0x07410000 0x00000000 0x36bf0000>;

No, don't do this. Please use memreserve or reserved-memory binding[1]
or combination of both. Probably reserved-memory if you need the
kernel to access some of these regions.

Rob

[1] Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
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