linux-kernel - Re: [PATCH] arm64: dts: qcom: ipq5424: Add reserved memory for TF-A

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Message-ID: <0826de9f-0125-44d9-84cd-1c52ba199a4a@oss.qualcomm.com>
Date: Tue, 24 Jun 2025 15:27:31 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vignesh Viswanathan <quic_viswanat@...cinc.com>
Subject: Re: [PATCH] arm64: dts: qcom: ipq5424: Add reserved memory for TF-A

On 6/24/25 12:36 PM, Kathiravan Thirumoorthy wrote:
> From: Vignesh Viswanathan <quic_viswanat@...cinc.com>
> 
> IPQ5424 supports both TZ and TF-A as secure software options and various
> DDR sizes. In most cases, TF-A or TZ is loaded at the same memory
> location, but in the 256MB DDR configuration TF-A is loaded at a different
> region.
> 
> So, add the reserved memory node for TF-A and keep it disabled by default.
> During bootup, U-Boot will detect which secure software is running and
> enable or disable the node accordingly.
> 
> Signed-off-by: Vignesh Viswanathan <quic_viswanat@...cinc.com>
> Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
> ---

Can the said u-boot simply dynamically add the reservation then?

Konrad