linux-kernel - Re: [PATCH 02/20] arm64: dts: qcom: Introduce Kaanapali SoC

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Message-ID: <1d1cd6eb-6004-47e4-b6e6-006928e79578@oss.qualcomm.com>
Date: Wed, 5 Nov 2025 11:13:45 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Jingyi Wang <jingyi.wang@....qualcomm.com>,
        Akhil P Oommen <akhilpo@....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, aiqun.yu@....qualcomm.com,
        tingwei.zhang@....qualcomm.com, trilok.soni@....qualcomm.com,
        yijie.yang@....qualcomm.com,
        Tengfei Fan <tengfei.fan@....qualcomm.com>
Subject: Re: [PATCH 02/20] arm64: dts: qcom: Introduce Kaanapali SoC

On 11/5/25 8:30 AM, Jingyi Wang wrote:
> 
> 
> On 11/4/2025 8:54 PM, Konrad Dybcio wrote:
>> On 11/4/25 10:04 AM, Jingyi Wang wrote:
>>>
>>>
>>> On 10/14/2025 7:46 PM, Akhil P Oommen wrote:
>>>>
>>>>
>>>> On 9/25/2025 5:47 AM, Jingyi Wang wrote:
>>>>> Kaanapali is Snapdragon SoC from Qualcomm.
>>>>>
>>> <...>
>>>>> +
>>>>> +    reserved-memory {
>>>>> +        #address-cells = <2>;
>>>>> +        #size-cells = <2>;
>>>>> +        ranges;
>>>>> +
>>>>
>>>> This is missing a bunch of reserved regions which causes device crash when you stress memory allocation.
>>>>
>>>> -Akhil.
>>>>
>>>
>>> Hi Akhil,
>>>
>>> We will not add all the reserved-memory in dts, other regions are designed to
>>> be added in bootloader.
>>
>> If what Akhil says is true and Linux is crashing, something must be
>> wrong..
>>
>> Konrad
> 
> Hi Konrad,
> 
> There was discussion about the reserved memory in QCS8550 change.
> And the conclusion is that reserved memory regions which aren't relevant to
> the kernel(like the hypervisor region) don't need to be described in DT to avoid
> memory map change and update frequently. These regions will be runtime added
> through bootloader.
> 
> ref:https://lore.kernel.org/all/20240618072202.2516025-3-quic_tengfan@quicinc.com/
> 
> The bootloader we currently use for Kaanapali has not supported this, and we have
> solutions like add temp change to add these in DTS until the final bootloader is
> provided.

I think we're well past that date though? OnePlus website says I can order
their new flagship next week..

Konrad