Hi tom,
please take a look to MIMXRT1050 EVK Board Hardware User’s Guide
2.7. QSPI Flash
A 64Mbit QSPI Flash is used on the MIMXRT1050 EVK Board. If the developer wants to boot from the QSPI Flash, the boot device switch(SW7) settings should be: OFF, OFF, ON, OFF, as shown in Table3.
By default, this QSPI Flash is disabled on the EVK. To enable it, Hyper Flash should be removed when the QSPI Flash is selected as the boot device. And R153, R154, R155, R156, R157, R158 should add 0 Ohm resistors.
Regards,
Carlos
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