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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: e3naW3xpHmhmQXlFYkLgJg4b1ZQABp/bPcBYVjI0L+Y89MxI1WsEP69y8MYD9lwQIoJQdJRxkuq5UsWb+uOqoco8l4ErIkTaKbqf5c3PzvUvgZxTHhQzPOp0JdqqxJlNKQXMkNWXXSp7RLB+RTb/ADuYDkLmc9B+HIqa+/rbY4Ytyx5l0Vnt136QhP9KVa6qh4xpdxRX7MWZ3eRc1RFAzswrfISLwsGezCoVgU1lARn6vQ0xn2txL+YzQyNWUHq2hl3QtNVbDdQWQ9zHX1aiEdqbtWEYpMcn/eCVmr0MXZ1oucQaj2TkwcUOIzNxeKgIW6USWs4DyDj6IeA/urcuHNontn6IkW/H/BgdlNb1ITCUKqa0evfE+AxL/q997paylKrnlZAtSz18Egwubkd8Ysi4wUxQFhCqpsOZtxpb4QH6Vsc12PR5rW5Dv+Bhl281 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jun 2026 13:52:28.5267 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 41329c93-b63c-422c-9f4b-08ded1f7d48a X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM3PEPF00009B9D.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB8458 On 24/06/2026 14:48, Jie Gan wrote: > > > On 6/24/2026 9:27 PM, Konrad Dybcio wrote: >> On 6/24/26 11:49 AM, Jie Gan wrote: >>> The AMBA bus attempts to read the CID/PID of a device before invoking >>> its probe function if the arm,primecell-periphid property is absent. >>> This causes a deferred probe issue for the TraceNoC device, as the >>> CID/PID cannot be read from the periphid register. >> >> Why does it probe defer? >> > > For an AMBA device, the periphid is mandatory for probing. In the > amba_match function, AMBA attempts to read the periphid from the CID/PID > registers if the arm,primecell-periphid property is absent in the device > tree. If this read fails, it returns -EPROBE_DEFER, and the probe > ultimately fails. Why does it fail ? power management ? hw broken ? Is it really AMBA or do you pretend that to be an AMBA device by faking the CID/PID? Suzuki > Most AMBA devices expose valid CID/PID registers, so specifying > arm,primecell-periphid in the device tree is usually unnecessary. > However, for the TraceNoC device in this case, AMBA cannot reliably read > the periphid from the corresponding registers. > >> And is this required for all TNOC devices? > > So far, the TNOC device has been added to sm8750, Glymur, and Kaanapali > platforms, and all exhibit probe failures due to the same root cause. > > I prefer to fix it on Kaanapali first. > > Thanks, > Jie > >> >> Konrad >