topic How to configure half of FlexNVM as D-flash?half of FlexNVM as EEPROM backup region? in S32K

How to configure half of FlexNVM as D-flash?half of FlexNVM as EEPROM backup region?

459021854 — Mon, 20 Jul 2020 09:09:41 GMT

Hi guys,

I have a question, ask for your help.

In the project example of ‘flash_partitioning_s32k142’ all of FlexNVM(64k) is set as EEPROM backup region, all of FlexRAM(4K) is set as EEPROM.

Could I separate half of FlexNVM as D-flash to store program, and half of FlexNVM as EEPROM backup region? also FlexRAM do not need to be configured as much as 4K to be EEPROM, only need a few bytes needed, Configure rest of FlexRAM as ram?

If convenient could you give me some reference code.

Thanks.

‌S32 SDK@all experts

Re: How to configure half of FlexNVM as D-flash?half of FlexNVM as EEPROM backup region?

dinarogers1989 — Tue, 21 Jul 2020 11:11:03 GMT

When the partition code is not set to full data flash, the data set size can be set to any of several non-zero values dqfansurvey.

Re: How to configure half of FlexNVM as D-flash?half of FlexNVM as EEPROM backup region?

dianabatrlova — Tue, 21 Jul 2020 12:01:50 GMT

Hello,

I would like to suggest checking AN11983 - Using the S32K1xx EEPROM Functionality

https://www.nxp.com/docs/en/application-note/AN11983.pdf

Yes, it is possible to split FlexNVM.

The options how to split the FlexNVM block between D-Flash and emulated EEPROM backup memory (E-Flash), see below:

This setting represents "DEPartitionCode" parameter in the "FLASH_DRV_DEFlashPartition()" function

About your second question related to FlexRAM. The FlexRAM cannot be split, we can use only the whole FlexRAM as an SRAM or EEPROM.

I hope it helps.

Best regards,

Diana

Re: How to configure half of FlexNVM as D-flash?half of FlexNVM as EEPROM backup region?

459021854 — Wed, 22 Jul 2020 01:25:33 GMT

it works! thanks