linux-kernel - Re: [PATCH v2 3/6] arm64: dts: qcom: qcm6490-shift-otter: Add missing reserved-memory

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Message-ID: <3ryhntdf52cukvcbfad5prlggqsee54nsf7us6hdd5h5f73pog@yrgo6o6j22gw>
Date: Mon, 27 Oct 2025 11:45:48 -0500
From: Bjorn Andersson <andersson@...nel.org>
To: Luca Weiss <luca.weiss@...rphone.com>
Cc: Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Casey Connolly <casey.connolly@...aro.org>, Alexander Martinz <amartinz@...ftphones.com>, 
	~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v2 3/6] arm64: dts: qcom: qcm6490-shift-otter: Add
 missing reserved-memory

On Thu, Oct 09, 2025 at 11:06:33AM +0200, Luca Weiss wrote:
> From: Alexander Martinz <amartinz@...ftphones.com>
> 
> It seems we also need to reserve a region of 81 MiB called "removed_mem"
> otherwise we can easily hit memory errors with higher RAM usage.
> 

If you make sure CONFIG_MEMTEST is enabled, you can boot with memtest=1
on the command line to catch such issues, without relying on "higher RAM
usage" (or randomness).

Regards,
Bjorn

> Fixes: 249666e34c24 ("arm64: dts: qcom: add QCM6490 SHIFTphone 8")
> Signed-off-by: Alexander Martinz <amartinz@...ftphones.com>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---
>  arch/arm64/boot/dts/qcom/qcm6490-shift-otter.dts | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/qcm6490-shift-otter.dts b/arch/arm64/boot/dts/qcom/qcm6490-shift-otter.dts
> index 0d331bda4a82..31650c29b1ca 100644
> --- a/arch/arm64/boot/dts/qcom/qcm6490-shift-otter.dts
> +++ b/arch/arm64/boot/dts/qcom/qcm6490-shift-otter.dts
> @@ -118,6 +118,11 @@ cdsp_mem: cdsp@...00000 {
>  			no-map;
>  		};
>  
> +		removed_mem: removed@...00000 {
> +			reg = <0x0 0xc0000000 0x0 0x5100000>;
> +			no-map;
> +		};
> +
>  		rmtfs_mem: rmtfs@...00000 {
>  			compatible = "qcom,rmtfs-mem";
>  			reg = <0x0 0xf8500000 0x0 0x600000>;
> 
> -- 
> 2.51.0
>