From: Frank Wunderlich <frank-w@public-files.de>

Add memory range handled by ATF to not be touched by linux kernel.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
---
 arch/arm64/boot/dts/mediatek/mt7988a.dtsi | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
index a3a7deda35a5..7721d2ec06ee 100644
--- a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
@@ -81,6 +81,18 @@ reg_3p3v: regulator-3p3v {
 		regulator-always-on;
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		/* 320 KiB reserved for ARM Trusted Firmware (BL31 and BL32) */
+		secmon_reserved: secmon@43000000 {
+			reg = <0 0x43000000 0 0x50000>;
+			no-map;
+		};
+	};
+
 	soc {
 		compatible = "simple-bus";
 		ranges;
-- 
2.43.0

Il 29/10/24 11:39, Frank Wunderlich ha scritto:
> From: Frank Wunderlich <frank-w@public-files.de>
> 
> Add memory range handled by ATF to not be touched by linux kernel.
> 
> Signed-off-by: Frank Wunderlich <frank-w@public-files.de>

If you are really sure that this is always the same for all boards based on MT7988,
I will trust you and give you my R-b once this series gets out of RFC state.

Cheers,
Angelo

> ---
>   arch/arm64/boot/dts/mediatek/mt7988a.dtsi | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
> index a3a7deda35a5..7721d2ec06ee 100644
> --- a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
> @@ -81,6 +81,18 @@ reg_3p3v: regulator-3p3v {
>   		regulator-always-on;
>   	};
>   
> +	reserved-memory {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		/* 320 KiB reserved for ARM Trusted Firmware (BL31 and BL32) */
> +		secmon_reserved: secmon@43000000 {
> +			reg = <0 0x43000000 0 0x50000>;
> +			no-map;
> +		};
> +	};
> +
>   	soc {
>   		compatible = "simple-bus";
>   		ranges;

> Gesendet: Mittwoch, 27. November 2024 um 14:34
&gt; Von: "AngeloGioacchino Del Regno" <angelogioacchino.delregno@collabora.com>
&gt; An: "Frank Wunderlich" <linux@fw-web.de>, "Rob Herring" <robh@kernel.org>, "Krzysztof Kozlowski" <krzk+dt@kernel.org>, "Conor Dooley" <conor+dt@kernel.org>, "Matthias Brugger" <matthias.bgg@gmail.com>
&gt; CC: "Frank Wunderlich" <frank-w@public-files.de>, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.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@public-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@public-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@43000000 {
&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@public-files.de></frank-w@public-files.de></frank-w@public-files.de></matthias.bgg@gmail.com></conor+dt@kernel.org></krzk+dt@kernel.org></robh@kernel.org></linux@fw-web.de></angelogioacchino.delregno@collabora.com>