old-www/HOWTO/Remote-Serial-Console-HOWTO/bugs-setserial.html

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>A.7. Modem hangs up during initialization</H1
><P
>Using <B
CLASS="COMMAND"
>setserial</B
> will reset the serial
port. This will hang up the modem.</P
><P
><B
CLASS="COMMAND"
>setserial</B
> is sometimes used during the
boot process, resulting in the output seen in <A
HREF="bugs-setserial.html#BUGS-SETSERIAL-INIT"
>Figure A-3</A
>. Look into the file
<TT
CLASS="FILENAME"
>/etc/rc.serial</TT
> and remove any references to
the port which is being used as the serial console.</P
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><B
>Figure A-3. <B
CLASS="COMMAND"
>setserial</B
> causes a modem to hang up as
the machine initializes</B
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>&#8230;
Mounting local filesystems: [ OK ]
Turning on user and group quotas for local filesystems: [ OK ]
Enabling swap space: [ OK ]
/dev/ttyS0 at 0x03f8 (irq = 4) is a 16550A
NO CARRIER</TT
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