in the LS1021ATWR ref manual, there are 8 bits that I don't find any explain on their purpose:
CSU_SA0[4-5] CSU_SA0[6-7] CSU_SA0[8-9] and CSU_SA0[10-11]
They are briefly described in section 126.96.36.199 Secure Access register (p440)
I think the odd one is a lock for the even one, but I don't understand the purpose of the even one.
Is there some more information about these override bits ? What are they used for ?
Also the table CSU_SAn field descriptions just after seems to describe something else then the description from above (talking about security of masters). Is this a documentation issue or am I missing something ?