Hi everyone,
thanks for your replies. i finally got it working. the problem was as indicated by bkatt the GPIO setting.
i was using qspi_cs3 for initialization which was already configured for USB pull down. i connected
my sd card to cs0 & got it working .
but here arises a new question that all these GPIOs are mutually exclusive . what if i wish to connect 4
peripherals to qspi & also use USB then what do i need to do??
thnks again