MPC5xxx中的主题 Re: MPC5746R OVERLAY is not effective

MPC5746R OVERLAY is not effective

liushiquan — Tue, 16 Sep 2025 14:38:26 GMT

As the picture shows, address of YC_UTnkT_swtSrcCfg_C is 0x01015c3e, that is remapping to 0x4003c03e.

Now 0x4003c03e is 0x56, and the mirror flash 0x09015c3e is also 0x56, but the point is not break.

Why?

Re: MPC5746R OVERLAY is not effective

davidtosenovjan — Wed, 17 Sep 2025 08:27:28 GMT

Pay attention to following example code:

https://community.nxp.com/t5/MPC5xxx-Knowledge-Base/Example-MPC5744P-Flash-Overlay-SRAM-S32DS-Power-2-1/ta-p/1384958

It is the different device but same principle.

Hope it helps

Re: MPC5746R OVERLAY is not effective

liushiquan — Wed, 17 Sep 2025 08:47:26 GMT

Yes, I has followed the code, to remap ram over flash, and I did it. When I write value to ram, the mirrored flash is changed too.
But the code is still executing as no-mirrored flash, not mirrored flash

Re: MPC5746R OVERLAY is not effective

liushiquan — Wed, 17 Sep 2025 09:30:06 GMT

the break point is not break

Re: MPC5746R OVERLAY is not effective

davidtosenovjan — Wed, 17 Sep 2025 17:00:45 GMT

You would have to execute the code from mirrored address range.

Re: MPC5746R OVERLAY is not effective

liushiquan — Thu, 18 Sep 2025 00:21:51 GMT

but my code and data is not in mirrored address range.

Re: MPC5746R OVERLAY is not effective

davidtosenovjan — Thu, 18 Sep 2025 07:28:28 GMT

To use calibration feature (i.e. overlay) you have to execute code or read data from mirrored address range, otherwise calibration is not applied. You can change linker command file configuration if you need to use it so.

Re: MPC5746R OVERLAY is not effective

liushiquan — Fri, 19 Sep 2025 00:14:56 GMT

Will it make the mcu runninig a bit slower, Or is there any other impact?

Re: MPC5746R OVERLAY is not effective

davidtosenovjan — Mon, 22 Sep 2025 08:09:05 GMT

No, it should not run slower: