Trace encoder putc() support #158
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Signed-off-by: Nathaniel Graff <nathaniel.graff@sifive.com>
This will allow redirecting stdout via the dts file and sending all stdout out as trace messages instead of serial uart messages.
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Put back OpenOCD into the top-level Makefile
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Add support to freedom-metal to allow redirecting stdout to use the trace-encoder as the stdout device instead of the UART. This allows printing into the trace message stream as Aux Access Write Message trace messages, which the trace-deocoder can reconstruct into the printed messages.