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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-658b46ac0e8sm1431956a12.34.2026.01.28.04.19.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 28 Jan 2026 04:19:11 -0800 (PST) Message-ID: <7a3541f8-079e-459a-9f30-cb20002e75f8@oss.qualcomm.com> Date: Wed, 28 Jan 2026 13:19:09 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/3] arm64: dts: qcom: monaco: Add EL2 overlay To: Mukesh Ojha , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260127-talos-el2-overlay-v2-0-b6a2266532c4@oss.qualcomm.com> <20260127-talos-el2-overlay-v2-2-b6a2266532c4@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260127-talos-el2-overlay-v2-2-b6a2266532c4@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTI4MDEwMSBTYWx0ZWRfX0yofgpMAgBPx hccvDt2BVX1sMAwnNwmEZrtC1OiBh3h+hbsdFYKTdVfSXr+bYp05naTiWmPdM+KLCjrySvbjutj 3mxCRAk2wFN/osMz/vbYzJa8Pntej/T3KP1+zKKVmoPHeQmonCYVOfIk3p7tjZwUvqkJVnUIAR9 Be9iU00/JxiXRQMxVdaIMp2Nlg1NmGzHndSqDgdMIMryrXUHBlf7aihymSBps47D9zS9a1JqYt/ VRaLnUr30nsAK0amGYSkoHru//LcWtnObPDEuaClbVHEgqOGS1O3rRpKaaHUE8XvXVLtlNyG3Pm U2WCL66Km7oTlX9iytyqsEKqrHgXyAIO3dgmPe4NhsU1MXZU1KWG/YTTzzAkK0Kat4R/YNh6lpE emPvskMQJyCi6FyOjFKMItegkG96ZzQAuQJxWU8Q+G+54mu9RwSdnJq/2exGLrjGjYQe9rU79om dzU7vCXsB8/Zy9d952A== X-Authority-Analysis: v=2.4 cv=XfWEDY55 c=1 sm=1 tr=0 ts=6979fec1 cx=c_pps a=7E5Bxpl4vBhpaufnMqZlrw==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=sdnczi_gjX_ezsEsx7EA:9 a=QEXdDO2ut3YA:10 a=eSe6kog-UzkA:10 a=pJ04lnu7RYOZP9TFuWaZ:22 X-Proofpoint-GUID: JW2J9g30o3k9wkXu5CUH-UW5MTpE3f6M X-Proofpoint-ORIG-GUID: JW2J9g30o3k9wkXu5CUH-UW5MTpE3f6M X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-01-28_02,2026-01-28_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 impostorscore=0 phishscore=0 priorityscore=1501 suspectscore=0 adultscore=0 bulkscore=0 lowpriorityscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2601280101 On 1/27/26 12:43 PM, Mukesh Ojha wrote: > All the Monaco IOT variants 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 Monaco 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 > --- Reviewed-by: Konrad Dybcio Konrad