Re: [PATCH 1/3] arm64: dts: qcom: sdm845: Add Coresight support

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Hi Mathieu,

+
+	etm@7040000 {
+		compatible = "arm,coresight-etm4x", "arm,primecell";
+		arm,primecell-periphid = <0x000bb95d>;

I'm a little curious as to why you need to bypass the normal AMBA bus discovery method by forcing the peripheral ID. Tracers don't show up the way other
coresight devices do at boot time?


Yes on some Qcom SoC's like SDM845 and also on some previous ones, for ETM(only) amba bus discovery method fails because of wrong pid read from the registers. So we have to force this primecell peripheral ids to probe etm.

- Sai

--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation



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