While I'm reading the datasheet for the (EXAR) ST16550, this is an uart
with fifo's, I'm beginning to believe that the serial driver should
maintain a copy of this write-only register.
I understand (from this info) that when bits that are programmed i.e. FIFO
RX or TX trigger level the others must be re-written or they will be
lost(reset).
The contents of the FIFO Control Register (FCR) is recalculated each
time we need it in change_speed(); since it's relatively trivial to
recalculate it, there's no point in saving a copy of it somewhere.
- Ted
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