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

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

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@quicinc.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@quicinc.com>
>>>> Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@oss.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@oss.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