Use all of FlexNVM as DataFlash on K65/K66

[unknowncoder]

What I want to do?

• I am trying to understand how to setup the FlexNVM to be used as data flash. 

What I want to do this?

• I plan to use all the data flash with a proprietary file system, and I would like to use all 256KByte of Data flash that available to the MK65FX.

Environment 

• I am using the MCUExpresso SDK 2.6.0 with a standalone GCC compiler. I would like to the the ftfx_flexnvm driver that came with the SDK to do this. 
• MK65FX.

My Questions

1. Does anyone have any example code on how to setup the FlexNVM to use all data flash? 
2. While digging around in the ftfx_flexnvm and ftfx_controller modules I notice the flex NVM is initialized by reading data flash IFR which is a 1KB non volatile area. How would I write to this area the correct configuration that are needed to set up the flexNVM for data flash operation only?
   1. I am assuming I can use write a linker script with the correct memory map. But what do I need to put in that area?

By the way I tagged K66 here because it's pretty much identical to the K65.

[Alexis_A]

Hi,

The SDK has a driver specified for this (fsl_ftfx_flexnvm) that could be useful, in this file there's the following function that can be use to partition the memory:

status_t FLEXNVM_ProgramPartition(flexnvm_config_t *config, ftfx_partition_flexram_load_opt_t option, uint32_t eepromDataSizeCode, uint32_t flexnvmPartitionCode)‍‍

To enable this function you will need to change the following defines MK65F18/MK66F18_features.h if this are not enabled:

#define FSL_FEATURE_FLASH_HAS_FLEX_NVM (1)

#define FSL_FEATURE_FLASH_HAS_PROGRAM_SECTION_CMD (1)‍‍‍‍‍‍

I hope this helps you.

Best Regards,

Alexis Andalon

[unknowncoder]

The `FLEXNVM_ProgramPartition()` seems like the right way to go. Can you see my question below with regards to partitioning the DFlash.

1. Before performing a `FLEXNVM_ProgramPartition()` do I need to erase DFLASH first?
2. After performing a `FLEXNVM_ProgramPartition()` do I need to reboot?

It looks like a reboot is required so the FlexNVM can be correctly configured by reading the DataFlash0 IFR, can you confirm?

Thanks

[Alexis_A]

Hi,

1.- Yes,  you will need to erase to erase the flash before executing this command.

2.- I don't think this is need it, in the description of the command is not mention and it only need to finish the command.

Best Regards,

Alexis Andalon