RE: TB on MPC5500

> To properly read TBL and TPU to form a 64-bit result, is there a magic
> sequence to catch TBL rolling over between the maser's?  Or is it done
> the old-fashioned way?


Possibly this is the "old-fashioned way", but it's the best I know :

    mftbu   r5          # load upper word of time base
    mftb    r4          # load lower word of time base
    mftbu   r3          # re-read upper word
    cmpw    r3,r5       # check that upper word didnt change
    beq     got_time    # If not, branch
    mftb    r4          # It changed, have to get new LSW to match
got_time:               # (result in r3:r4)



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