S32KのトピックRe: sRe: On-chip secure NVM (S32K314)

On-chip secure NVM (S32K314)

luojing — Thu, 17 Sep 2026 04:55:49 GMT

The Secure NVM mapping(FULL_MEM) described in HSE FW install for S32K3xx.pdf is as follows:

HSE data flash is 160KB，APP data flash is 88KB，total ： 160KB+88KB=248KB

However, the dflash allocation described in S32K3XXRM.pdf is as follows:

The total size of dflash is 128KB

Why are the Dflash sizes mentioned in the two documents different?

Note: I am using the HSE firmware version HSE_FW_S32K344_0_2_55_0_S2502.exe

sRe: On-chip secure NVM (S32K314)

davidtosenovjan — Thu, 17 Sep 2026 14:14:54 GMT

It is described here:

Re: sRe: On-chip secure NVM (S32K314)

luojing — Thu, 17 Sep 2026 14:25:40 GMT

Is it incorrect for HSE (FULL UMEM) Dflash size to be 160KB? Should it be 128KB-88KB=40KB?

Re: sRe: On-chip secure NVM (S32K314)

davidtosenovjan — Thu, 17 Sep 2026 14:33:10 GMT

Secure data flash starts at 0x10016000 (for FULL_MEM) having 168KB. It is the same on all derivatives.

The appnote is not up to date.

Re: sRe: On-chip secure NVM (S32K314)

luojing — Thu, 17 Sep 2026 14:43:28 GMT

The HSE FW install for S32K3xx.pdf only specifies the range of HSE Pflash and dflash, without specifying the RAM range. What is the RAM range used by HSE?
What are the starting address and size?
Is there a specific document describing it?

Re: sRe: On-chip secure NVM (S32K314)

davidtosenovjan — Fri, 18 Sep 2026 07:58:29 GMT

All these information you will find in HSE-B Firmware Reference Manual.

It is a secure file, so following procedure is needed to follow unless you have already done it before:

https://www.nxp.com/docs/en/user-guide/nxp-secure-access-rights-registration.pdf

For better understanding you may also see following link:

https://www.nxp.com/support/support/secure-access-rights:SEC-ACCESS