Baud rate detection macro

[Enrico Piria]

Hello.
I'm writing a device driver for a serial port that is able
to automatically detect the baud rate of the serial line.
This patch adds a macro to the list contained in serialio.h.
When the device detects the new baud rate, the driver is thus
able to inform the application about it, via
the "indicate_status" callback. The new baud rate
(expressed through the proper CYGNUM_SERIAL_BAUD_xxx macro)
might be passed in the "which" field of the "cyg_serial_line_status_t" structure.

Please note that, in the changelog, I added my email address
with some little anti-spam tricks. If this doesn't seem correct
to you, you are free to modify it. However, this practice could
become a policy, in order to prevent people from getting their
mailbox flooded with trash.

Regards

Enrico Piria



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