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RT1020/RT1050 - PRDB - What is a region lock?

Question asked by rshipman on Jul 13, 2020
Latest reply on Jul 20, 2020 by Victor Jimenez



I am using the RT1020, but I am told this document applies:

Security Reference Manual for the i.MX RT1050 Processor, Rev. 1, 04/2018



Table 3-14. Information for encrypted region, pages 79-80

0x0C - 0x0F, Lock_option, Region Lock options:

0 - All regions are unlocked

1 - All FAC regions that belong to BEE Region1 are locked

2 - All RAC regions that belong to BEE Region0 are locked

3 - Both BEE regions are locked, All FAC regions defined in PRDB are locked.



  1. What is a RAC region? Is this a typo? Should it be FAC?
  2. What does it mean by ‘locking’ a region? What does the lock do?
  3. Why is a PRDB region able to lock both BEE Region 1 and BEE Region 0? I would have expected PRDB0 to lock BEE Region 0 and PRDB1 to lock BEE Region 1. What am I missing?


Many thanks and regards,