FROMLIST: arm64: dts: qcom: talos: Add EL2 overlay #581
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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 a EL2-specific DT overlay and apply it to Talos IOT variant devices to create -el2.dtb for each of them alongside "normal" dtb. [1] https://docs.qualcomm.com/bundle/publicresource/topics/80-70020-4/boot-developer-touchpoints.html#uefi Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com> Signed-off-by: Xin Liu <xin.liu@oss.qualcomm.com> Link: https://lore.kernel.org/all/20260127-talos-el2-overlay-v2-3-b6a2266532c4@oss.qualcomm.com/
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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 a EL2-specific DT overlay and apply it to Talos IOT variant devices to create -el2.dtb for each of them alongside "normal" dtb.
[1]
https://docs.qualcomm.com/bundle/publicresource/topics/80-70020-4/boot-developer-touchpoints.html#uefi
Link: https://lore.kernel.org/all/20260127-talos-el2-overlay-v2-3-b6a2266532c4@oss.qualcomm.com/