Description
Due to a problem in the Quartus® II software version 15.1 and earlier, byteswap must be enabled on QSPI programming for Max® 10 Nios® II designs to allow booting from QSPI flash.
Resolution
To workaround this problem in the Quartus II software version 15.1 and earlier, please refer to Altera Application Note AN730 page 65/96 , "Software Programmer Object File(.pof) Generation" section.
This problem is scheduled to be fixed in a future version of the Quartus II software.