I installed FreeBSD 5.3 on my laptop dynabook SS S8/210LNLN. Here is my report.
Please note that I am quoting some specific phrases used in FreeBSD.

Boot configuration
You need to go into loader command line (menu number "6") once and enter the following 2 lines,
otherwise system hangs in the boot process.

set hint.elcr.0.disabled=1
set hw.pci.enable_io_modes=0

When the installation is done properly, you'd better to add the below 2 lines in /boot/loader.conf.

hint.elcr.0.disabled="1"
hw.pci.enable_io_modes="0"


X configuration
"X -configure" is the right command. For the Japanese keyboard, please follow the general X procedure.


Sound configuration
You can get it to work by executing kldload snd_ich.ko.


***You can also check the related memo from here. (05/08/05)