Due to a problem in the FPGA Generic QUAD SPI Controller II version 18.1, erase operations starting from sector 256 onwards will fail, causing all write operations to be unsuccessful when using an MT25QU01G flash device.
Erase and write operations executed below sector 256 will be performed without problems.
This problem affects the FPGA Generic QUAD SPI Controller II included with the Quartus® Prime Standard Edition Software version 18.1
To work around this issue, please download and install the patch file for your Operating system:
• Download Quartus Prime 18.1 Standard patch 0.01 for Windows (.exe)
• Download Quartus Prime 18.1 Standard patch 0.01 for Linux (.run)
• Download ReadMe file for Quartus Prime 18.1 Standard patch 0.01 (.txt)
This problem is fixed starting with the Quartus® Prime Software version 19.1