linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: sm8450: Add IMEM and PIL info region

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Message-ID: <d1dc0c9b-eab2-0287-d0a2-ead44ecee5ce@quicinc.com>
Date:   Mon, 6 Feb 2023 20:06:13 +0530
From:   Mukesh Ojha <quic_mojha@...cinc.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>, <agross@...nel.org>,
        <andersson@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>
CC:     <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] arm64: dts: qcom: sm8450: Add IMEM and PIL info
 region



On 2/4/2023 3:07 AM, Konrad Dybcio wrote:
> 
> 
> On 3.02.2023 18:04, Mukesh Ojha wrote:
>> Add a simple-mfd representing IMEM on SM8450 and define the PIL
>> relocation info region, so that post mortem tools will be able
>> to locate the loaded remoteprocs.
>>
>> Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
>> ---
>  From XBL:
> 
> 0x14680000, 0x0002A000, "IMEM Base"
> 
> Is there anything in that wider address range that would interest
> us? I recall Alex once dug into that when diving into IPA, but
> I can not recall the conclusion..
Spec-wise, yes IPA do own these 0x146A8000 - 0x146AA000 .
But, not sure what they use it for.

-Mukesh
> 
> Konrad
>>   arch/arm64/boot/dts/qcom/sm8450.dtsi | 15 +++++++++++++++
>>   1 file changed, 15 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
>> index 5704750..474ea1b 100644
>> --- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
>> @@ -3536,6 +3536,21 @@
>>   			};
>>   		};
>>   
>> +		sram@...aa000 {
>> +			compatible = "qcom,sm8450-imem", "syscon", "simple-mfd";
>> +			reg = <0 0x146aa000 0 0x1000>;
>> +
>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +
>> +			ranges = <0 0 0x146aa000 0x1000>;
>> +
>> +			pil-reloc@94c {
>> +				compatible = "qcom,pil-reloc-info";
>> +				reg = <0x94c 0xc8>;
>> +			};
>> +		};
>> +
>>   		apps_rsc: rsc@...00000 {
>>   			label = "apps_rsc";
>>   			compatible = "qcom,rpmh-rsc";