[U-Boot-Users] errata CPU10 for MPC855 ?
steven.scholz at imc-berlin.de
Wed Feb 5 17:17:10 CET 2003
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.
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
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"???
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