Alexander von Gluck IV 91161d1d6f pl011 uart: Fix fifo states
* Lets wait for space *before* writing to the fifo
  instead of after.
* Flush functions now really flush the fifo waiting
  for them to enter an empty state.
* Simple memory barriers added (may need revised)
  We don't have access to the kernel barriers here.
2012-05-16 04:47:24 -05:00
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