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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b8de3d734aesm849478766b.7.2026.02.03.02.31.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Feb 2026 02:31:37 -0800 (PST) Message-ID: <6dc6a2ea-e812-4966-af32-96cb776717b8@oss.qualcomm.com> Date: Tue, 3 Feb 2026 11:31:36 +0100 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Questions About SM8550 Support To: Aaron Kling Cc: linux-arm-msm@vger.kernel.org References: <24f770ff-e4a6-4f8c-be72-26ff5cbf8d1a@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=Zc4Q98VA c=1 sm=1 tr=0 ts=6981ce8b cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=E2KHuo4Xqxd5VruFSTEA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 X-Proofpoint-ORIG-GUID: xFe2lbCTb63lTQY7FWD6L_rHBcwDkSqC X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjAzMDA4MyBTYWx0ZWRfX6rELk4kt69YE AbAMtG3iPxkuGbw98FHpOf2GMTTN04XOK0ihNzDMR0ZVlxmFD7IPHsTZtcNCI2s0/167JMnH1N7 b73FrWQFxXsTMhKajLEq2Ne8yw/4u9tevonRT7fLL9frf74hwrqll+u7gXyZgTxxVrIJyffx8aX AeKBK/yke1foo8PmVNWzpcConw+yMmJesOHs6sZ1W3c32tza5gmtyJCEoR/bTaFhSV0lbd1GqqQ KRoof/Gl5EvkZBybRYn9j6txPAkE6aIe6umFNsuoENSXMYz2oT3QghJzwOd8ED5jhPuE6nI6Ak4 rqEMweokbbCI/zAnBIsYhGeRfgLd8NSY9906e1MYHUazlF+WpNQsOu8jcH3gV3fE3r9qJWzciQC GJpFyxA2AVb9FZ7yeuj82XcqTSmYo9XgL35Y1CyFJ6LowiIfcBXm12mPs/kw15gmWGU9nvBSyz4 Tfy+qER9k1s8Ry1HXlg== X-Proofpoint-GUID: xFe2lbCTb63lTQY7FWD6L_rHBcwDkSqC 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=2026-02-03_03,2026-02-02_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 impostorscore=0 adultscore=0 phishscore=0 bulkscore=0 lowpriorityscore=0 clxscore=1015 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602030083 On 2/3/26 12:12 AM, Aaron Kling wrote: > On Mon, Feb 2, 2026 at 4:36 AM Konrad Dybcio > wrote: >> >> On 1/30/26 6:13 PM, Aaron Kling wrote: >>> On Fri, Jan 30, 2026 at 5:01 AM Konrad Dybcio >>> wrote: >>>> >>>> On 1/27/26 11:48 PM, Aaron Kling wrote: >>>>> I am working on the AYN Odin 2 qcs8550 series of devices, specifically >>>>> for Android, using mainline kernel drivers. I have come across some >>>>> missing functionality and failures that I would like to inquire about. >>>>> >>>>> * ABL fails to load a dtbo using a baseline dtb unmodified from >>>>> mainline. Using changes described in the gunyah watchdog thread [0], a >>>>> dtbo loads and the devices boot as expected. If any of the changes in >>>>> that post don't exist in the base dtb, abl will fail to load the dtbo >>>>> and go to the bootloader menu. This appears to be an issue in the >>>>> baseline abl code, affecting all devices of that generation. Would it >>>>> be allowable to merge a change adding those changes to the sm8550 >>>>> dtsi, allowing an unmodified mainline dtb to work with overlays? [...] >> I'd consider building full DTBs for each device > > My end goal makes that difficult. I'm working on LineageOS, an open > source AOSP fork. I am attempting to make a single build target that > supports all four AYN qcs8550 devices. Android puts the base dtb in > vendor_boot. The concept supports multiple dtb's, but the ids the > bootloader uses to fetch said dtb matches across all four devices. > Even more unfortunately, this is true for the dtbo id as well; the > vendor did not set unique board ids for the different devices. > However, I can pull some tricks to use a variant dtbo image per > device. That concept isn't feasible for the vendor_boot partition. So > I'm taking every reasonable effort to support dtbo's. > > And to be fair, beyond these node name and label requirements, I have > not seen any breakage. Once the bootloader is convinced to actually > apply the dtbo, it works as expected. I see It may be that I lost some context across various threads, but IIUC we're down to just label changes, which I suppose are generally fine.. Am I following? Konrad