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

[Xilin Wu]

On 1/30/2026 3:31 PM, Xin Liu wrote:
> All the existing variants Talos boards are using Gunyah hypervisor
> 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@xxxxxxxxxxxxxxxx>
> ---
>   arch/arm64/boot/dts/qcom/x1-el2.dtso | 8 ++++++++
>   1 file changed, 8 insertions(+)

Hi Xin,

Will this work on Snapdragon X laptops running the older Windows 
firmware? I believe that Peripheral Image Loader support in EL2 requires 
a newer version of the TrustZone firmware.

I noticed that the TrustZone firmware used in hamoa_iot-ubuntu [1] has a 
different version string compared to the WP firmware found in laptops:

iot-ubuntu: TZ.XF.5.0
WP: TZ.XF.5.28.1


[1] 
https://softwarecenter.qualcomm.com/nexus/generic/software/chip/ubuntu_qualcomm_iot-spf-1-0/ubuntu-qualcomm-iot-spf-1-0_test_device_public/r1.0.r1_00004.0/hamoa_iot-ubun-1-0-r1/common/build/bin

--
Best regards,
Xilin Wu <sophon@xxxxxxxxx>