If we failed to size the Rx FIFO, assume the worst. This however is not a size of 1. Since we already know there is a FIFO, we can safely assume that it is at least 16 bytes. Note that all this is mostly academic anyway. We don't use the size of the Rx FIFO currently. If we add support for hardware flow control, we only care about Rx FIFO sizes larger than 16.
If we failed to size the Rx FIFO, assume the worst. This however
is not a size of 1. Since we already know there is a FIFO, we can
safely assume that it is at least 16 bytes. Note that all this is
mostly academic anyway. We don't use the size of the Rx FIFO
currently. If we add support for hardware flow control, we only
care about Rx FIFO sizes larger than 16.

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