program the external flash

[sapirbuz]

Hi,

We are using MCU PN MIMXRT1051CVL5B. 

The Boot will be through an external 8Mb serial NOR Flash using the NXP 3.3V FlexSPI port A secondary pins (see pictures below).

We want the user to do SW updates (write new data to the external flash) through the host without additional HW steps to support the SW updates. 

Can we program the external flash through the host when the boot mode is defined as "boot from fuse"?

In case no, is there any way to control the boot mode pins by SW and not by HW? (for example, send a gpio from the MCU to the boot_mode[0] pin to define it as '1')

[jeremyzhou]

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1) Can we program the external flash through the host when the boot mode is defined as "boot from fuse"?
-- Yes, you can program the QSPI via the SWD/JTAG interface with the debug tools, for instance, Jlink, etc.
2) Is there any way to control the boot mode pins by SW and not by HW?
-- No, it's impossible to make it.
Have a great day,
TIC

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[sapirbuz]

Thank you for you answer,

|We want to do the updates through the host (USB), without any additional HW cable/board change.

How can we do that?

[jeremyzhou]

Hi,
Thanks for your reply.
1) How can we do that?
-- Actually, it's able to program the QSPI flash via the USB or UART interface when forcing the RT series MCU to enter the Serial Download mode, you can refer to it for details.
Have a great day,
TIC

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