Why do I get return data 0x0 when performing a QSPI_READ operation on certain sectors using the Mailbox Client IP? - Why do I get return data 0x0 when performing a QSPI_READ operation on certain sectors using the Mailbox Client IP? Description Due to a problem in the Quartus® Prime Pro Edition Software v21.1 and above, when using the Stratix® 10 FPGA or all Agilex™ devices, the Mailbox Client IP will return data of 0x0 when performing the QSPI_READ operation that reads multiple flash sectors at a time. This is due to a bug in the SDM firmware that prevents the QSPI_READ operation from being issued to the configuration flash device. Resolution To work around this problem, execute QSPI_READ operations until the sector boundary and perform another QSPI_READ operation for the next sector. This problem is scheduled to be fixed in a future release of the Quartus® Prime Pro Edition Software. Custom Fields values: ['novalue'] Troubleshooting 1508892844 False ['Mailbox Client Stratix® 10 FPGA IP'] ['FPGA Dev Tools Quartus® Prime Software Pro'] novalue 21.1 ['Agilex™ 7 FPGAs and SoCs', 'Stratix® 10 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']