Due to the StrongARM support code in the cpu_reset() MC-function,
an instruction was executed to drain the write back buffer on StrongARM
processors (might even be armv4+).
Since ARM{6,7} don't recognize this instruction they will either except
for an illegal instruction on this or have undefined behaviour resulting
in an endless illegal instruction/data abort/reset behaviour.
The fix contains a flag that signals if the WB flush should be executed
or not for the detected processor.
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