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>Chapter 10. Configuring a kernel to support serial console</TD
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><H1
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><A
NAME="KERNELCOMPILE-25"
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>10.1. Linux kernel version 2.5</H1
><P
>Kernel version 2.5 is under active development, so this
section may be out of date. Version 2.5 includes support for the
console to a serial port attached to a USB dongle. The
<TT
CLASS="LITERAL"
>-dj</TT
> patch to the version 2.5 kernel has a
rewritten console layer; it is not known if the rewritten layer
effects the user-space use of the serial console.</P
><P
>When configuring the kernel set the following configuration
parameters:</P
><DIV
CLASS="FIGURE"
><A
NAME="KERNELCOMPILE-25-MENUCONFIG"
></A
><P
><B
>Figure 10-1. Kernel configuration for serial console using <B
CLASS="COMMAND"
>make
menuconfig</B
></B
></P
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><PRE
CLASS="SCREEN"
>Character devices --->
[*] Virtual terminal
[*] Support for console on virtual terminal
<*> Standard/generic (8250/16550 and compatible UARTs) serial support
[*] Support for console on serial port</PRE
></FONT
></TD
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></DIV
><P
>This should set the following configuration parameters in
<TT
CLASS="FILENAME"
>/usr/src/linux/.config</TT
>.</P
><DIV
CLASS="FIGURE"
><A
NAME="KERNELCOMPILE-25-DOTCONFIG"
></A
><P
><B
>Figure 10-2. Kernel configuration for serial console using
<TT
CLASS="FILENAME"
>.config</TT
></B
></P
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><FONT
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><PRE
CLASS="PROGRAMLISTING"
>CONFIG_VT=y
CONFIG_VT_CONSOLE=y
CONFIG_SERIAL=y
CONFIG_SERIAL_CONSOLE=y</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><P
>If you also want to use a serial port attached to a
<SPAN
CLASS="ACRONYM"
>USB</SPAN
> bus, then in addition to the usual
<SPAN
CLASS="ACRONYM"
>USB</SPAN
> configuration, configure the kernel to load
the <SPAN
CLASS="ACRONYM"
>USB</SPAN
> console driver and one of the
<SPAN
CLASS="ACRONYM"
>USB</SPAN
> serial dongles (our example uses the generic
serial dongle).</P
><DIV
CLASS="FIGURE"
><A
NAME="KERNELCOMPILE-25-USB-MENUCONFIG"
></A
><P
><B
>Figure 10-3. Kernel configuration for <SPAN
CLASS="ACRONYM"
>USB</SPAN
> dongle
serial console using <B
CLASS="COMMAND"
>make menuconfig</B
></B
></P
><TABLE
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><TD
><FONT
COLOR="#000000"
><PRE
CLASS="SCREEN"
>USB Serial Converter support --->
<M> USB Serial Converter support
[M] USB Serial Console device support
[M] USB Generic Serial Driver</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><P
>This should set the following configuration parameters in
<TT
CLASS="FILENAME"
>/usr/src/linux/.config</TT
></P
><DIV
CLASS="FIGURE"
><A
NAME="KERNELCOMPILE-25-USB-DOTCONFIG"
></A
><P
><B
>Figure 10-4. Kernel configuration for <SPAN
CLASS="ACRONYM"
>USB</SPAN
> dongle
serial console using <TT
CLASS="FILENAME"
>.config</TT
></B
></P
><TABLE
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><TD
><FONT
COLOR="#000000"
><PRE
CLASS="PROGRAMLISTING"
>CONFIG_USB_SERIAL=m
CONFIG_USB_SERIAL_CONSOLE=m
CONFIG_USB_SERIAL_GENERIC=m</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><P
>You should also configure the kernel without the magic
<B
CLASS="KEYCAP"
>SysRq</B
> key, as described in <A
HREF="security-sysrq.html"
>Section 9.9</A
>.</P
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