Is there a Freescale UUID/serial number in i.MX233?

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Is there a Freescale UUID/serial number in i.MX233?

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helderalves
Contributor I

For my application I need a SoC unique UID or serial number, preferably without the need to have to burn any eFuse. Is there any such thing in i.MX233? 

Thanks. 

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helderalves
Contributor I

Thanks for your help. 

I would really like to avoid having to burn eFuses. 

I had already looked carefully into the RM and had the impression that probably HW_OCOTP_OPSx registers had unique information I could use as UUID, however I'm not sure how to access it from Linux userspace. 

Should I be able to read those registers using devmem tool to read SoC registers (I had already succeeded reading some other registers) if before the reading attempt I set HW_OCOTP_CTRL[RD_BANK_OPEN] = 1 with devmem tool? Should I be able to do this RW operation with devmem tool? 

Thanks. 

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b36401
NXP TechSupport
NXP TechSupport

I can suggest to make use of OTP bit in iMX233. The i.MX23 does have a unique key made up of the bits from HW_OCOTP_OPSx registers.
Please refer chapter 7 "On-Chip OTP (OCOTP) Controller" of i.MX23 Applications Processor Reference Manual:

http://cache.freescale.com/files/dsp/doc/ref_manual/IMX23RM.pdf

Have a great day,
Victor

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art
NXP TechSupport
NXP TechSupport

No, there is no pre-built unique ID number within the i.MX233 processor, so, the only way to provide it is to correspondingly burn the cutomer OTP bits.


Have a great day,
Artur

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