topic Re: LPC55s16 Read/Write protect in LPC Microcontrollers

LPC55s16 Read/Write protect

dmiv — Mon, 26 Jul 2021 07:33:09 GMT

Hi,

i read the manual up and down, backward and forward and could not find the answer to simple question whether LPC55s16 has a volatile or non-volatile readout protection. According to

https://community.nxp.com/t5/LPC-Microcontrollers/Do-LPC5500-Series-MCUs-support-Code-Read-Protection-CRP/m-p/1278264

NXP TechSupport wrote "...This would need to be done directly in software...". But the main question is if this thing is volatile or non-volatile.

And what exactly, practically, i have to do to set up this protection in one or the another case?

Thank you

Re: LPC55s16 Read/Write protect

Alexis_A — Wed, 28 Jul 2021 00:36:57 GMT

Hello @dmiv,

In the table 287, Lifecycle state descriptions mention that depending of the state some of the features are lock or unlock. So in some case the CMPA and the ISP are locked.

Best Regards,

Alexis Andalon

Re: LPC55s16 Read/Write protect

dmiv — Wed, 28 Jul 2021 12:35:28 GMT

Thank you for answer

You mean table 286. I saw it. Thank you.

Let me see if i can put it another way. I can use PFR to develop appropriate protection. Should i do it "directly in software"? Can i do it from outside, from MCUXpresso, for example?

Re: LPC55s16 Read/Write protect

dmiv — Mon, 02 Aug 2021 10:34:18 GMT

Please let me know if you need more accurate and detail question.

Please let me know if you do not want to answer.

Please let me know if you do not possess enough information.

I'd be appreciated in any case.

Re: LPC55s16 Read/Write protect

dmiv — Tue, 03 Aug 2021 08:00:21 GMT

Please let me know if you need more accurate and detail question.

Please let me know if you do not want to answer.

Please let me know if you do not possess enough information.

Please let me know if you couldn't give a Kanga-rat's balls about me, LPC55s16, answers and questions combined.

I'd be appreciated in any case.

Re: LPC55s16 Read/Write protect

AleGuzman — Tue, 03 Aug 2021 17:21:11 GMT

The Protected Flash Region PFR is the persistent storage for specific areas. This memory area is only accessible using ROM APIs or through blhost commands while in ISP mode.

PFR is composed of 3 regions

CFPA Customer Field Programmable Area
CMPA Customer Manufacturing Programmable Area
NMPA NXP Programmed Area

Inside the CMPA, a key storage area including the PUF activation code and several key codes.

Each region has a SHA256 hash digest field in the last 32 bytes. This digest is used during the deployment life-cycle state to cross-check integrity.