linux-kernel - Aw: Re: [RFC v1 12/14] arm64: dts: mediatek: mt7988: add reserved memory

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Message-ID: <trinity-348f9544-267c-4730-ad93-23de7fef64be-1732722504104@msvc-mesg-gmx024>
Date: Wed, 27 Nov 2024 16:48:24 +0100
From: Frank Wunderlich <frank-w@...lic-files.de>
To: angelogioacchino.delregno@...labora.com, linux@...web.de,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 matthias.bgg@...il.com
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Aw: Re: [RFC v1 12/14] arm64: dts: mediatek: mt7988: add reserved
 memory

&gt; Gesendet: Mittwoch, 27. November 2024 um 14:34
&gt; Von: "AngeloGioacchino Del Regno" <angelogioacchino.delregno@...labora.com>
&gt; An: "Frank Wunderlich" <linux@...web.de>, "Rob Herring" <robh@...nel.org>, "Krzysztof Kozlowski" <krzk+dt@...nel.org>, "Conor Dooley" <conor+dt@...nel.org>, "Matthias Brugger" <matthias.bgg@...il.com>
&gt; CC: "Frank Wunderlich" <frank-w@...lic-files.de>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
&gt; Betreff: Re: [RFC v1 12/14] arm64: dts: mediatek: mt7988: add reserved memory
&gt;
&gt; Il 29/10/24 11:39, Frank Wunderlich ha scritto:
&gt; &gt; From: Frank Wunderlich <frank-w@...lic-files.de>
&gt; &gt;
&gt; &gt; Add memory range handled by ATF to not be touched by linux kernel.
&gt; &gt;
&gt; &gt; Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
&gt;
&gt; If you are really sure that this is always the same for all boards based on MT7988,
&gt; I will trust you and give you my R-b once this series gets out of RFC state.

I'm not sure, but ATF is SoC specific and so it should be a SoC specific range, not board specific

&gt; Cheers,
&gt; Angelo
&gt;
&gt; &gt; ---
&gt; &gt;   arch/arm64/boot/dts/mediatek/mt7988a.dtsi | 12 ++++++++++++
&gt; &gt;   1 file changed, 12 insertions(+)
&gt; &gt;
&gt; &gt; diff --git a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
&gt; &gt; index a3a7deda35a5..7721d2ec06ee 100644
&gt; &gt; --- a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
&gt; &gt; +++ b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
&gt; &gt; @@ -81,6 +81,18 @@ reg_3p3v: regulator-3p3v {
&gt; &gt;   		regulator-always-on;
&gt; &gt;   	};
&gt; &gt;
&gt; &gt; +	reserved-memory {
&gt; &gt; +		#address-cells = &lt;2&gt;;
&gt; &gt; +		#size-cells = &lt;2&gt;;
&gt; &gt; +		ranges;
&gt; &gt; +
&gt; &gt; +		/* 320 KiB reserved for ARM Trusted Firmware (BL31 and BL32) */
&gt; &gt; +		secmon_reserved: secmon@...00000 {
&gt; &gt; +			reg = &lt;0 0x43000000 0 0x50000&gt;;
&gt; &gt; +			no-map;
&gt; &gt; +		};
&gt; &gt; +	};
&gt; &gt; +
&gt; &gt;   	soc {
&gt; &gt;   		compatible = "simple-bus";
&gt; &gt;   		ranges;
&gt;
&gt; </frank-w@...lic-files.de></frank-w@...lic-files.de></frank-w@...lic-files.de></matthias.bgg@...il.com></conor+dt@...nel.org></krzk+dt@...nel.org></robh@...nel.org></linux@...web.de></angelogioacchino.delregno@...labora.com>