Missing message IDs in STM32N6 BootROM trace parser

[Jimmy7]

Hello,

I am currently working with the STM32N6 and debugging the boot sequence using the BootROM traces. I am dumping the secure and non-secure RAM ring buffers via STM32CubeProgrammer while the chip is in the Open state (using hotplug).

To decode the traces, I am referring to the “official” ST template: Template_BootRom_traces/FSBL/Src/rom_trace_parser.c.

However, I have noticed that the BootROM outputs several message IDs that are entirely missing from the switch statement in the romTrace_ParseRecord() function. Because these IDs are omitted from the table, they just get skipped by the C API, making it difficult to fully understand the boot execution flow.

My questions are:

  1. Is there an updated version of rom_trace_parser.c available that includes a more complete table of these message IDs?
  2. Alternatively, is there a reference manual or document that lists all possible BootROM trace message codes and their meanings?

 

Any pointers would be greatly appreciated.

Thank you!

[Saket_Om]

Hello ​@Jimmy7 

Please refer to the UM3234  

[Jimmy7]

Hello Saket_Om,

To decode the traces, I am using the official ST template: rom_trace_parser.c https://github.com/stm32-hotspot/STM32N6-Boot-ROM-Traces/blob/main/Template_BootRom_traces/FSBL/Src/rom_trace_parser.c.

However, the BootROM outputs several message IDs that are entirely missing from the infMSG_ID2String() switch statement. This results in unresolved traces like UNKNOWN_0x2A000001, UNKNOWN_0x00002909, and UNKNOWN_0x0000003B, making it hard to follow the execution flow.

I have searched through all official ST documentation (including UM3234 and RM0486), and these 32-bit trace message codes are completely undocumented in any ST manual. (Note: UM3234 Section 3.10 only documents the high-level 64-bit status word, not the detailed 32-bit hex codes found in the parser https://github.com/stm32-hotspot/STM32N6-Boot-ROM-Traces/blob/main/Template_BootRom_traces/FSBL/Src/rom_trace_parser.c).

Thank you!