ARM errata 430973 on multi platform kernels (was: OMAP3-N900: Add microphone bias voltages)

[Pavel Machek]

Hi!

> Maybe an option would be to provide two cpu_v7_switch_mm
> implementations (one with the errata and one without). Then
> the system can start with the simple implementation. Once
> the boot as progressed far enough to know, that the hardware
> is affected by the errata, it could switch to the implementation
> with the flushing.

Actually... we should start with the slow&safe option, and then switch
to faster implementation if workaround is not needed.
									Pavel
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