errata CPU10 for MPC855 ?
Hi there,
I just stumbled over an old errata:
CPU10. Possible Excess Current Consumption in Deep Sleep Mode.
Certain nodes of the multiplier hardware are not initialized at reset, and may thus result in non-destructive internal contention. As a result, if the processor is put into Deep Sleep mode without first putting the multiplier into a known state, current consumption in this mode may be higher than expected.
Workaround:
Execute a mullw instruction at any point after reset; this will put the internal nodes in an orderly state. Deep Sleep mode may then be entered at any time thereafter.
The only mullw's I found in post/cpu/asm.S.
I am not sure, but I guess these functions will only get called if I enable POST!?
So should we put "a mullw instruction at any point after reset"???
Thanks,
Steven