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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: GIBkx0B2PomzL2mS8PnR9aWRHouZEHy1 X-Proofpoint-ORIG-GUID: GIBkx0B2PomzL2mS8PnR9aWRHouZEHy1 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE3MDA5NSBTYWx0ZWRfX1YoLD+0o36BC R+Ev1b9zofoyqJ7ukdz/2dwT2/U29FCGeE6/FZeLBg4hMjpKKuSYI9EjAYqGHSrrwKcR8byDvUN gM65P0mhFWjbAxIocx+vhm1gy0Wm6Sgj50K61Xk9XV2VEQMQ61AgZgkse5A9GPXXuBb/B8xm6ha cg0Mm7w087z1dWU7TwHix3ZvCbjjWqV0QomCbKVmpaBU6RiVoxHyxHVKtsHgobdLNp32Hvapvbs 4HXSe9sTPOeXmFG2q+KmA7h3RdeftDIgL+NpkniRCbQ0j1OGeOD4V1CL+pUL5qfY23bnScGOqp/ ei2nOIPrJFj0WDacrPcI8JQxK/39V8ESVwDwBJqul78eTWe2TZvT1TMLfBjTOSbBA2jY/9yH7i7 hCJMq8LACiR2zkJIJtVxcDzdKbn+UsbjZSK4DLH27JTxFQ2c3rKcBwislBHBe9AhMdAals7dDyc h0odk0lr4s8/x+eIhUQ== X-Authority-Analysis: v=2.4 cv=TaqmcxQh c=1 sm=1 tr=0 ts=6a59f7d9 cx=c_pps a=HLyN3IcIa5EE8TELMZ618Q==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=RNpBc-B2Pr4ugAXc9NsA:9 a=QEXdDO2ut3YA:10 a=bTQJ7kPSJx9SKPbeHEYW:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE3MDA5NSBTYWx0ZWRfX8WJLXx+iV9BS 327hGWz21U25GaS6/K+BUKXe4xe17winuNh7gO0ag75Ft5d/1PbQcHYTPHul2lQ2Evdo8/bJrXO wigyoDiZeHEXWlldFIGzT59E8q1oER8= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-17_02,2026-07-15_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 suspectscore=0 lowpriorityscore=0 phishscore=0 adultscore=0 spamscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607170095 On 7/14/26 9:19 AM, Mukesh Ojha wrote: > All existing Kodiak board variants run the Gunyah hypervisor, which > means Linux can only boot at EL1 on those devices. It is possible to > boot Linux at EL2 on these devices [1]. > > When running under Gunyah, remote processor firmware IOMMU streams are > controlled by Gunyah. Without Gunyah, the IOMMU is managed by the > consumer of the DeviceTree. Describe the firmware streams for each > remote processor in an EL2 overlay. > > Add an EL2-specific DT overlay and apply it to Kodiak IoT variant > devices to produce a -el2.dtb alongside the standard dtb. Modem and > media subsystems are not yet supported due to missing dependencies. > The GPU zap shader is disabled. In EL2 mode the kernel owns the > hardware watchdog, so it is enabled here. The wifi-firmware child > node describes the IOMMU stream for the WCN6750 firmware; the &wifi > node itself is left untouched so that platforms without WiFi are > unaffected by the overlay. > > [1] https://docs.qualcomm.com/bundle/publicresource/topics/80-70020-4/boot-developer-touchpoints.html#uefi > > Co-developed-by: Sumit Garg > Signed-off-by: Sumit Garg > Signed-off-by: Mukesh Ojha > --- If gunyah reserves gpu_zap_mem, we could probably shave it off too Reviewed-by: Konrad Dybcio Konrad