What does BEE_KEYx_SEL "From Register" mean?

[rshipman]

Regarding RT1020 and RT1050.

In the fuse map, BEE_KEY0_SEL and BEE_KEY1_SEL can be set to 00 which means "From Register".

What does this mean, e.g. which register?

Many thanks.

[rshipman]

Ok, I think "From Register" means from OTPMK.

Please confirm.

[kerryzhou]

Hi rshipman,

   About the BEE key from register, you need to refer to another RT secure document:

Security Reference Manual for the i.MX RT1050 Processor

https://www.nxp.com/webapp/sps/download/mod_download.jsp?colCode=IMXRT1050SRM&location=null&appType=...

Please check more details from the above document, Chapter 6 Bus Encryption Engine (BEE)

Wish it helps you!

Have a great day,
Kerry

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[rshipman]

And also, what are the reasons for choosing OTPMK over SW_GP2 fuses (and vice versa)?