Mailbox Client IP - SEND_CERTIFICATE command through FPGA fabric

Hello, 

The SDM rejected the certificate due to source/format/transfer constraints, not cryptographic validity. 

SInce the JTAG external is working, your certificate(signature) is valid. 

This specific SDM command is probably not accepted from the internal FPGA fabric mailbox path on Agilex 3C non-HPS. 

Recommendation:

1- Use indirect transfer mode(buffered writes) 

2- Check if the data written is 32-bit words

3- Ensure payload base address aligned to 8bytes, and length is multiple of 4bytes. Pad with zero if needed. 

If you need this to work in non-HPS system, the supported path may be limited to external JTAG. 

I would currently assume there is no supported example because this command is likely not supported from the internal FPGA fabric mailbox path on Agilex 3C non-HPS device. 

regards,

Farabi