[ECOS] In-order exection of I/O on PowerPC 60x

[Andrew Lunn]

> When I placed a sync instruction between the critical read accesses,
> instead of eieio, our problems disappeared. (The sync instruction covers
> reads even if memory is not marked as "guarded".)

What is the overhead of a sync compaired to an eieio? Should we just
change the barrier macro?

        Andrew

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