On an UltraSparc Station 5 with 9Gb HDD, the Server partition scheme is as follows: hda1 4go /usr hda2 4go /home hda3 256M /var hda4 256M /boot hda5 64Mo swap So the boot partition is located outside the 1Gb of the HDD. This breaks SILO which cannot boot a file outside this limit. So, the automatic partitionning should set the boot in the first Gb zone.
This is fixed in the latest cut of the installer available in beta.