[PATCH] Don't convert line endings in passthrough mode

[andrzej zaborowski]

Hi,
  we played with the gsm passthrough support today to see if we can
drive a Neo modem with a gsmd running on PC. At first the parser was
getting confused because u-boot's serial drivers (including usbtty)
tend to convert line endings when writing to the port. With the
attached patch the "terminal" command tries to avoid the conversion so
that gsmd doesn't get confused.

Note that the patch doesn't attempt to support all serial drivers in
u-boot so it's probably not good for upstream, but may be useful for
playing with gsmd.

Regards,
Andrew
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