Boot Manager interface to SP processor not working for MCU3 VDK

Luca_Fodale — Tue, 07 Oct 2025 13:58:58 GMT

Hi all,
I'm working on GM SW based on GRAYVIP 22 with HSE FW s32n5_gp_fw_1.1.8_0.19.0_pb250801 This Software implements the boot manager and boot loader code. Loading the envelop1 bin, i am able to see the correct value in the memory area.

After this, the boot manager on CRS executed the FBL_Port_BM_InitializeInterface() function that is used to establish an interface to SP processor.
Inside this function, there is a do-while loop that needs a specific response of SP to continue and itis never satisfied until the elapsed time is not reached, because the FBL_BM_SPResponse is always 0xFF.

Do you have any hints?
I can share the reproducer

Re: Boot Manager interface to SP processor not working for MCU3 VDK

petervlna — Wed, 08 Oct 2025 11:45:58 GMT

Hello,

Could you specify what is SP?

if there is no response from SP then check

Verify SP Firmware Boot
- Use a debugger or trace to confirm SP is alive and executing code.
- Check if SP is stuck in a reset or waiting for a trigger.
Log or Trace SP Behavior
- If possible, add logging or breakpoints in SP code to see if it receives any request or command from CRS.
Review Boot Manager Expectations
- Look into the documentation or source code to understand what FBL_BM_SPResponse should be set to when SP is ready.

Best regards,

Peter

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Boot Manager interface to SP processor not working for MCU3 VDK

Re: Boot Manager interface to SP processor not working for MCU3 VDK