[Bug 204969] geom_eli_passphrase_prompt does not recognize input via serial console

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204969

            Bug ID: 204969
           Summary: geom_eli_passphrase_prompt does not recognize input
                    via serial console
           Product: Base System
           Version: 10.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: tok at redux1.net

Situation: GELI disk encryption has been automatically set up by 10.2
installer. Therefore, geom_eli_passphrase_prompt ist set to true in
/boot/loader.conf to show the new "early" pre-kernel GELI prompt ("GELI
passphrase:").

However, when a serial comconsole is set up and the system is operated via
serial console, the pre-kernel GELI passphrase prompt does not recognize any
character input and therefore cannot be used to unlock the disk(s).


The serial console is configured via loader.conf:
boot_multicons="YES"
boot_serial="YES"
console="comconsole,vidconsole"

Direct input on video console works, so does any subsequent serial input after
the GELI prompt.

Current workaround via serial is to disable geom_eli_passphrase_prompt in order
to unlock the disk(s) when prompted after the kernel was loaded.

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