Why does the read/write HAL API fail when the access length reaches the last byte of flash memory when using the Generic Serial Flash Interface (GSFI) IP HAL driver? - Why does the read/write HAL API fail when the access length reaches the last byte of flash memory when using the Generic Serial Flash Interface (GSFI) IP HAL driver? Description When performing a read or write operation on a flash memory device using the GSFI IP HAL read/write API, the API may incorrectly return an EINVAL error code. This issue occurs because the operation end address is miscalculated. As a result, the GSFI IP HAL API incorrectly determines that the operation end address exceeds the valid flash memory range and flags the access length as invalid. For example, when reading or writing the entire 1 GiB flash device , the operation reaches the last byte with an access length of 2147483648 bytes . In this case, the GSFI IP HAL API miscalculates the operation end address as 0x80000000 , which exceeds the flash end address of 0x7FFFFFFF . Consequently, the access length is incorrectly treated as invalid, and a false EINVAL error code is returned. This issue does not occur when reading from or writing to other addresses that do not include the last byte of the flash memory. a { text-decoration: none; color: #464feb; } tr th, tr td { border: 1px solid #e6e6e6; } tr th { background-color: #f5f5f5; } Resolution To work around this issue, update the following line in the intel_gsfi_validate_read_write_arguments() Original: end_address = start_address + length; Change to: end_address = start_address + length - 1; This correction ensures the calculated end address does not exceed the valid flash memory range. This issue will be fixed in a future Quartus® Prime Design Software release. Custom Fields values: ['novalue'] Troubleshooting 22022016926 novalue ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] novalue 25.3 ['Agilex™ 3 FPGAs and SoCs', 'Agilex™ 5 FPGAs and SoCs', 'Agilex™ 7 FPGAs and SoCs', 'Agilex™ 9 FPGA Direct RF-Series', 'Agilex™ 9 FPGAs and SoCs', 'Arria® 10 FPGAs and SoCs', 'Cyclone® 10 GX FPGA', 'Stratix® 10 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']