How to execute APP from the external Flash. my bootloader is in internal flash(MK64FX)

NEIL4 · ‎01-11-2022

With Ref(AN3854) which is exclusively for Codefire, where (Executing code over the Mini-FlexBus is supported.)

But Im interfracing with NOR Flash via flexbus in MK64FX512.

Please provide application note or Sample code.

hank you.

jingpan · ‎01-13-2022

We don't have any references designs using a parallel NOR flash. ColdFire's FlexBus is similar to Kinetis. Please see https://community.nxp.com/t5/Kinetis-Microcontrollers/K66-NOR-Flash-Compatibility/m-p/773522

You also can refer to AN4393. It introduces Kinetis FlexBus. https://www.nxp.com/docs/en/application-note/AN4393.pdf

One thing you should know is if you put code in NOR the performance going to the FlexBus is going to be significantly worse than what they'll get running from the on-chip flash, and since the K24 doesn't have a system cache there isn't really any way to avoid that.