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Add SI TImings demo #40

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This work allows to measure SI DMA/IO speeds.
It polls SI_STATUS and compute how many C0_COUNT increments have
happened during DMA/IO transfer.
Precision of timing is not absolute, as there can be many factors that
interfere with pure SI timings.

Tested only on PAL system.
See code for details.

This work allows to measure SI DMA/IO speeds.
It polls SI_STATUS and compute how many C0_COUNT increments have
happened during DMA/IO transfer.
Precision of timing is not absolute, as there can be many factors that
interfere with pure SI timings.

Tested only on PAL system.
See code for details.
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