linux-kernel - Re: [PATCH] arm64: dts: qcom: sa8775p: add symbols to dtb

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Date:   Thu, 16 Mar 2023 07:55:17 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Prasad Sodagudi <quic_psodagud@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Eric Chanudet <echanude@...hat.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sa8775p: add symbols to dtb

On 14/03/2023 05:48, Prasad Sodagudi wrote:
> 
> 
> On 3/9/2023 3:47 PM, Konrad Dybcio wrote:
>>
>>
>> On 10.03.2023 00:39, Eric Chanudet wrote:
>>> ABL uses the __symbols__ section to process the DTB before passing it
>>> forward. Without it, the bootstrap is interrupted.
>>>
>>> Signed-off-by: Eric Chanudet <echanude@...hat.com>
>>> ---
>> Fix your ABL.
> Hi Konrad,
> 
> Apps boot-loader need __symbols__ for dynamic overlay operation. 
> Qualcomm firmware passes an overlay file to apps boot-loader to overlay 
> some of the nodes based on firmware configuration. Without __symbols__ 
> apps boot-loader is not able to overlay.
> 
> Qualcomm hypervisor/gunyah would like to overlay arch timer node with 
> always-on property, So adding __symbols__ helps boot-loader to overlay.

Since none of these overlays are upstream, we can argue that it is not a
valid reason. If you decide to keep overlays downstream then also you
can keep patch enabling the overlays there...

Best regards,
Krzysztof