[Bug 277848] uart(4): hw.uart.console variable is not documented

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277848

            Bug ID: 277848
           Summary: uart(4): hw.uart.console variable is not documented
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: emaste@freebsd.org

Typical configuration for SuperMicro SOL redirection uses COM2 0x2f8/IRQ3.

Achieving a working serial console on other than COM1 in an EFI environment
requires setting the hw.uart.console variable, but it is not documented in
uart(4).

It is mentioned in passing in loader.efi though:
The FreeBSD kernel will look at the hw.uart.console variable to set its serial
console.  Its format should be described in uart(4) but is not.

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