Aw: Re: [RFC v1 12/14] arm64: dts: mediatek: mt7988: add reserved memory
From: Frank Wunderlich
Date: Wed Nov 27 2024 - 10:48:45 EST
> Gesendet: Mittwoch, 27. November 2024 um 14:34
> Von: "AngeloGioacchino Del Regno" <angelogioacchino.delregno@xxxxxxxxxxxxx>
> An: "Frank Wunderlich" <linux@xxxxxxxxx>, "Rob Herring" <robh@xxxxxxxxxx>, "Krzysztof Kozlowski" <krzk+dt@xxxxxxxxxx>, "Conor Dooley" <conor+dt@xxxxxxxxxx>, "Matthias Brugger" <matthias.bgg@xxxxxxxxx>
> CC: "Frank Wunderlich" <frank-w@xxxxxxxxxxxxxxx>, devicetree@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-mediatek@xxxxxxxxxxxxxxxxxxx
> Betreff: Re: [RFC v1 12/14] arm64: dts: mediatek: mt7988: add reserved memory
>
> Il 29/10/24 11:39, Frank Wunderlich ha scritto:
> > From: Frank Wunderlich <frank-w@xxxxxxxxxxxxxxx>
> >
> > Add memory range handled by ATF to not be touched by linux kernel.
> >
> > Signed-off-by: Frank Wunderlich <frank-w@xxxxxxxxxxxxxxx>
>
> 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.
I'm not sure, but ATF is SoC specific and so it should be a SoC specific range, not board specific
> 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;
>
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