This is th outpus of serial line information from Global Zone (GZ)
on SmartOS sungle-machine bare metal install.

# prtconf -v | grep -A1 'tty.-'
name='ttya-mode' type=string items=1
value='115200,8,n,1,-'
name='ttyb-mode' type=string items=1
value='115200,8,n,1,-'
name='ttyc-mode' type=string items=1
value='115200,8,n,1,-'
name='ttyd-mode' type=string items=1
value='115200,8,n,1,-'
--
name='ttyd-rts-dtr-off' type=string items=1
value='false'
name='ttyd-ignore-cd' type=string items=1
value='true'
name='ttyc-rts-dtr-off' type=string items=1
value='false'
name='ttyc-ignore-cd' type=string items=1
value='true'
name='ttyb-rts-dtr-off' type=string items=1
value='false'
name='ttyb-ignore-cd' type=string items=1
value='true'
name='ttya-rts-dtr-off' type=string items=1
value='false'
name='ttya-ignore-cd' type=string items=1
value='true'
and

# tr '�' '
' < /system/boot/environment | grep tty
ttya-mode=115200,8,n,1,-
ttyb-mode=115200,8,n,1,-
ttyc-mode=115200,8,n,1,-
ttyd-mode=115200,8,n,1,-