Hi All,
According to the reference manual for iMXRT1021, table 8-1 (ROM Bootloader Peripheral PinMux), the Bootloader can boot from FlexSPI_A in two places, and FlexSPI_B.
But I cannot see how it decides which one is the correct port?
Does it try all of them until it finds a good one?
I see nothing in the fuses or GPIO pins to control this feature?
Thanks,
Chris.
Hi Chris,
ROM does not support boot from FLEXSPI_B port directly. ROM always seeks a valid Flash Configuration Block from the FLEXSPI_A port and then re-configures the FLEXSPI controller using the valid parameters in the block read-out. This reconfiguration can include but is not limited to, FLEXSPI_B port support.
Have a great day,
Victor
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Hi Victor,
Thanks. Does that also mean that the Boot ROM always uses FLEXSPI_A 'primary pinmux' ? I.e. I cannot connect my Flash to the 'secondary pinmux' port (page 186 of Reference Manual) ?
Thanks,
Chris.
Hi Chris,
You can use the secondary pinmux, but keep in mind that these pins are used only for QSPI devices as specified in Table 8-9. Also, if you want to use these pins you will have to burn the corresponding fuses on the BOOT_CFG1 field.
Regards,
Victor