Accessing SDM SPI Flash via HPS fails (MBOX_RESP_PUF_ACCCES_FAILED) on Agilex 7 FPGA

Hello,

I've been able to use the SDM mailbox to get IDCODE, CHIPID, USERCODE, VOLTAGEs, TEMPERATUREs and CONFIG_STATUS information. Works great.

Accessing the QSPI is not working, and I don't know why.

QSPI_OPEN works.

QSPI_SET_CS results in MBOX_RESP_PUF_ACCCES_FAILED = 0x80, /* Invalid license for IID registration */

Doesn't matter which nCSO value, all four of them get the same failure.

Does anyone know how to resolve this error code?

Thanks.

PS - Reference the Mailbox Client Intel FPGA IPs User Guide 683290 2024.07.08.