linux-kernel - Re: [PATCH v3 1/2] arm64: dts: mediatek: mt8195-demo: fix the memory size to 8GB

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Date:   Tue, 5 Sep 2023 10:00:43 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Macpaul Lin <macpaul.lin@...iatek.com>,
        Alexandre Mergnat <amergnat@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Fabien Parent <fparent@...libre.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Cc:     Bear Wang <bear.wang@...iatek.com>,
        Pablo Sun <pablo.sun@...iatek.com>,
        Macpaul Lin <macpaul@...il.com>, stable@...r.kernel.org
Subject: Re: [PATCH v3 1/2] arm64: dts: mediatek: mt8195-demo: fix the memory
 size to 8GB

Il 05/09/23 05:45, Macpaul Lin ha scritto:
> The onboard dram of mt8195-demo board is 8GB.
> 
> Cc: stable@...r.kernel.org      # 6.1, 6.4, 6.5
> Fixes: 6147314aeedc ("arm64: dts: mediatek: Add device-tree for MT8195 Demo board")
> Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
> ---
>   arch/arm64/boot/dts/mediatek/mt8195-demo.dts | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Changes for v2:
> Changes for v3:
>   - No change.
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8195-demo.dts b/arch/arm64/boot/dts/mediatek/mt8195-demo.dts
> index b2485ddfd33b..ff363ab925e9 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8195-demo.dts
> +++ b/arch/arm64/boot/dts/mediatek/mt8195-demo.dts
> @@ -48,7 +48,7 @@
>   
>   	memory@...00000 {
>   		device_type = "memory";
> -		reg = <0 0x40000000 0 0x80000000>;
> +		reg = <0 0x40000000 0x2 0x00000000>;

Shouldn't this get automatically filled in by the bootloader?
Usually, that's the case: if it is, then the right thing to do here
is to change this property to

		/* The bootloader will fill in the size */
		reg = <0x0 0x40000000 0x0 0x0>;

Regards,
Angelo

>   	};
>   
>   	reserved-memory {