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

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Message-ID: <8b262389-3c1c-4618-9670-8de86751c83e@oss.qualcomm.com>
Date: Thu, 7 Aug 2025 16:03:35 +0530
From: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....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 8/5/2025 6:52 PM, Konrad Dybcio wrote:
> 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


Thanks Konrad, yeah we have a plan to mitigate this one for the upcoming 
projects.


>
> Konrad