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The Microsoft Serial Port Console Redirection (SPCR) specification revision 1.09 comprises additional field: Precise Baud Rate [1]. It is used to describe non-traditional baud rates (such as those used by high-speed UARTs). It contains a specific non-zero baud rate which overrides the value of the Configured Baud Rate field. If this field is zero or not present, Configured Baud Rate is used. Link: https://learn.microsoft.com/en-us/windows-hardware/drivers/serports/serial-port-console-redirection-table [1] Signed-off-by: Chen Pei <cp0613@linux.alibaba.com> Link: https://patch.msgid.link/20250913070815.16758-1-cp0613@linux.alibaba.com [ rjw: Corrected typo in the subject ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>