I have finally found some time to install my new Sun Enterprise 3000 server, now hostnamed Caradhras. It has been installed with Solaris 10 (s10_63), and a 5 GB sized partition has been dedicated to Debian. The config of the dualboot between Solaris and Debian wasn't very easy. I finally choose the following path :

1. Install Solaris (root partition on slice 0), and dedicate 2 partitions for Linux.


2. Let Solaris install its bootblock and update the nvram.


3. Install Linux/Debian and let it install Silo over the Solaris bootblock in slice 0


4. When in command line, run ''silo -t'' to install the Silo bootblock on the same partition as your Linux root.


5. Finally, boot from the Solaris cdrom and install the Solaris bootblock again on slice 0 :

installboot /usr/platform/`uname -i`/lib/fs/ufs/bootblk /dev/rdsk/c0t0d0s0

That way, the machine boots into its bootprompt, and with ''boot disk:g'' (if you installed Linux on /dev/sda7) you can boot into Silo.
Sun has put up a page with more information about Linux/Solaris dualboot setups.