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MGMT is the default UART, and no one should have to explicitly refer to
the UART unless they need USER (hsm.c:hal_serial_send_char).
The default UART is now exposed in the header file, so that the
default-using functions can be macros, which saves a few bytes in code
space, and a few microseconds in function call overhead.
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Note: This affects libhal/ks_token.c, which uses the keystore driver directly.
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Bugfix after new port of libcli where this enabling doesn't happen after
every command anymore.
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DMA is more efficient and less prone to miss characters than interrupts.
An open question is if circular mode is really the best. If someone
copy-pastes more than the RX buffer size of configuration into the CLI,
we risk the DMA controller catching up with the reader and overwriting
data not yet read.
Since we don't have flow control back to the users terminal, we will
always fail if too much data is entered before we can process it. The
question is if failing to stuff new data at the end of a buffer might be
better than data being overwritten - thus messing up the commands in
unpredictable ways.
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