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

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Message-ID: <95959a89-655b-4ac9-86ba-d8d943809b6b@oss.qualcomm.com>
Date: Tue, 5 Aug 2025 15:22:45 +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 7/23/25 9:04 AM, Kathiravan Thirumoorthy wrote:
> 
> On 6/25/2025 10:20 AM, Kathiravan Thirumoorthy wrote:
>>
>> On 6/24/2025 6:57 PM, Konrad Dybcio wrote:
>>> 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?
>>
>> Yeah it could have been done in U-Boot itself but it wasn't. 256MB DDR configuration solution is already shipped out and the stock U-Boot enable this node to avoid the random issues.
> 
> 
> Konrad, Do you have any further comments on this?

I really don't like it, but fine, I won't be blocking this either..

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Please make sure that the next time around the bootloader reserves
its own memory and doesn't depend on what the OS decides to do

Konrad