linux-kernel - Re: [PATCH] arm64: dts: qcom: hamoa: Add remoteproc in EL2 device trees

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Message-ID: <5qplhwnkiwhsfr5rxzjqk4v6rtvpqkvsg7qxvrpkqd3b7vjvob@jffvv4fvvd3d>
Date: Sat, 31 Jan 2026 09:56:45 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Xin Liu <xin.liu@....qualcomm.com>
Cc: andersson@...nel.org, konradybcio@...nel.org, robh@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        tingwei.zhang@....qualcomm.com, jie.gan@....qualcomm.com
Subject: Re: [PATCH] arm64: dts: qcom: hamoa: Add remoteproc in EL2 device
 trees

On Thu, Jan 29, 2026 at 11:31:13PM -0800, Xin Liu wrote:
> All the existing variants Talos boards are using Gunyah hypervisor

Why are you mentioning Talos here?

> which means that, so far, Linux-based OS could only boot in EL1 on
> those devices.  However, it is possible for us to boot Linux at EL2
> on these devices [1].
> 
> When running under Gunyah, the remote processor firmware IOMMU streams
> are controlled by Gunyah. However, without Gunyah, the IOMMU is managed
> by the consumer of this DeviceTree. Therefore, describe the firmware
> streams for each remote processor.
> 
> Add remoteproc to the EL2 device trees to generate the corresponding
> -el2.dtb files.
> 
> [1]
> https://docs.qualcomm.com/bundle/publicresource/topics/80-70020-4/boot-developer-touchpoints.html#uefi
> 
> Signed-off-by: Xin Liu <xin.liu@....qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/x1-el2.dtso | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 

-- 
With best wishes
Dmitry