In my program, the value of the 64-bit time base register is read
out, and you will find the later value is even smaller than the earlier
value from the log “log_timebase”.

         Do you have any idea about this problem, thanks for your any
advice. Attached is the code and log.

Your code has a problem, you do (upper << 32) | lower, it should
be ((unsigned long long)upper << 32) | lower .

That is not the problem though: in your TBL, the bit with value
0x40 is stuck to 1.  Broken hardware?


Segher