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<TITLE>Linux+Solaris HOWTO: Preparing Linux</TITLE>
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<H2><A NAME="s3">3. Preparing Linux</A></H2>
<H2><A NAME="kernel"></A> <A NAME="ss3.1">3.1 Building a new kernel</A>
</H2>
<P>Some people don´t like building a custom kernel. For those of you:
you <EM>must</EM> build your own kernel if you want to share data
between Solaris and Linux on one hard disk. If, however, you do not
want to share data, you are safe with your old kernel.
<P>Here are your kernel options for ``Solaris compatibility'':
<UL>
<LI>Under <CODE>code maturity</CODE>:
<DL>
<DT><B><CODE>Prompt for development drivers</CODE></B><DD><P>Unfortunately UFS writing is still experimental.
</DL>
</LI>
<LI>In <CODE>file systems</CODE>:
<DL>
<DT><B><CODE>UFS file system support</CODE></B><DD><P>UFS is
the Solaris file system
<DT><B><CODE>UFS file system
write support</CODE></B><DD><P>The only way to pass data
to Solaris
<DT><B><CODE>partition types / Solaris
(x86) partition table support</CODE></B><DD><P>Is needed
for the slices within your Solaris partition to be
found.
</DL>
</LI>
</UL>
Additional info about kernel building can be found in the
Kernel-HOWTO
<H2><A NAME="ss3.2">3.2 Preparing your boot loader</A>
</H2>
<P><EM>Before
messing with your boot loader, please make sure that you have
an emergency disk ready which enables you to boot your old
system.</EM>
<P>Unfortunately the Solaris install
overwrites the master boot record (MBR) and overwrites your
old boot manager.
<P>Fortunately, the Solaris boot manager
is able to chain-boot. For this to work you have to put your
old boot loader (e.g. lilo) into the boot sector of one primary
Linux partition.
<P>For lilo this means: look at your
/etc/lilo.conf. Look for the <CODE>boot=</CODE>
line. If it is something like <CODE>boot=/dev/hda1</CODE>
everything is fine. But if it´s something like
<CODE>boot=/dev/hda</CODE> it points to the MBR. Please change
it to point to a primary Linux partition
(e.g. <CODE>boot=/dev/hda1</CODE>)
<P>A way to check if your
boot-loader is chain-loadable is installing lilo in to the
MBR and trying to chain load your other boot-manager. I used
the following file called lilo.conf.mbr for
this:
<HR>
<PRE>
#lilo.conf.mbr
#Lilo in Master Boot Record doing nothing but chain-loading another lilo
boot=/dev/hda
root=/dev/hda5
install=/boot/boot.b
map=/boot/map
vga=ask
delay=50
other=/dev/hda1
label=lilochain
</PRE>
<HR>
You can then
run <CODE>lilo -C lilo.conf.mbr</CODE> to install lilo into your
MBR. And don´t forget to run <CODE>lilo</CODE> to have lilo in
the boot sector of your hard-drive.
<P>If you reboot
now, you should have a lilo-prompt. When you select <CODE>other</CODE> this
chain loads the old lilo, which in turn loads Linux.
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