[Bug 191907] [uart] Paging broken on serial console

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191907

--- Comment #3 from [e-mail] ---
Peter H pointed me in the right direction (I missed this section in UPDATING):

20140405:
        The uart(4) driver has been changed with respect to its handling
        of the low-level console. Previously the uart(4) driver prevented
        any process from changing the baudrate or the CLOCAL and HUPCL
        control flags. By removing the restrictions, operators can make
        changes to the serial console port without having to reboot.
        However, when getty(8) is started on the serial device that is
        associated with the low-level console, a misconfigured terminal
        line in /etc/ttys will now have a real impact.
        Before upgrading the kernel, make sure that /etc/ttys has the
        serial console device configured as 3wire without baudrate to
        preserve the previous behaviour. E.g:
            ttyu0  "/usr/libexec/getty 3wire"  vt100  on  secure

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