Hi 正人石川
for qspi one can look at linux driver in linux/drivers/mtd/spi-nor/fsl-quadspi.c
and for example of boot programming at mfg tool mfgtool2-yocto-mx-sabresd-qspi-nor-n25q256a.vbs script:
i.MX Software|NXP
Best regards
igor
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