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Date:   Sat, 2 Dec 2023 20:20:23 -0800
From:   Bjorn Andersson <andersson@kernel.org>
To:     Luca Weiss <luca@z3ntu.xyz>
Cc:     ~postmarketos/upstreaming@lists.sr.ht, phone-devel@vger.kernel.org,
        Andy Gross <agross@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/2] arm64: dts: qcom: msm8953: Set initial address
 for memory
Message-ID: <t6ckvr7bcpoc3z4cam7bilp67nn6qyvrmnqch6tlkwug7n2neq@32f5mso75fvu>
References: <20231125-msm8953-misc-fixes-v2-0-df86655841d9@z3ntu.xyz>
 <20231125-msm8953-misc-fixes-v2-1-df86655841d9@z3ntu.xyz>
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In-Reply-To: <20231125-msm8953-misc-fixes-v2-1-df86655841d9@z3ntu.xyz>
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On Sat, Nov 25, 2023 at 01:19:27PM +0100, Luca Weiss wrote:
> The dtbs_check really doesn't like having memory without reg set.
> 
> The base address depends on the amount of RAM you have:
> 
>   <= 2.00 GiB RAM: 0x80000000
>    = 3.00 GiB RAM: 0x40000000
>    = 3.75 GiB RAM: 0x10000000
>  (more does not fit into the 32-bit physical address space)
> 
> So, let's pick one of the values, 0x10000000 which is used on devices
> with 3.75 GiB RAM. Since the bootloader will update it to what's present
> on the device it doesn't matter too much.
> 
> Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
> ---
>  arch/arm64/boot/dts/qcom/msm8953.dtsi | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8953.dtsi b/arch/arm64/boot/dts/qcom/msm8953.dtsi
> index e7de7632669a..a3ba24ca599b 100644
> --- a/arch/arm64/boot/dts/qcom/msm8953.dtsi
> +++ b/arch/arm64/boot/dts/qcom/msm8953.dtsi
> @@ -174,10 +174,10 @@ scm: scm {
>  		};
>  	};
>  
> -	memory {

Wouldn't it be sufficient to add @0 here, to please dtbs_check?

Regards,
Bjorn

> +	memory@10000000 {
>  		device_type = "memory";
>  		/* We expect the bootloader to fill in the reg */
> -		reg = <0 0 0 0>;
> +		reg = <0 0x10000000 0 0>;
>  	};
>  
>  	pmu {
> 
> -- 
> 2.43.0
>