Hi,
Thank you for your interest in NXP Semiconductor products,
Are you talking about Cortex-M MCUXpresso SDK fsl-qspi example?
There are two examples under boards/evkmcimx7ulp/driver_examples/qspi/
These examples read and write from and to an external qspi flash via polling and edma transfer.
In this example, qspi will send data and operate the external flash connected with QSPI. Some simple flash command will be executed, such as Write Enable, Erase sector, Program page.
Example will first erase the sector and program a page into the flash, at last check if the data in flash is correct.
Regards