Hit F2 to get into the BIOS. I found the DEL key also worked. Unfortunately in each case I was greeted by an "enter password" screen and I did not know the password. Briefly removing the onboard battery did not help here.
As I expected, an exchange of emails with Fujitsu support ended up with an unhelpful:
I believe the only way for this product would be a chargeable repair to replace the mainboard.
This is a little frustrating as I imagined it was just a matter of toggling one bit or erasing some bytes somewhere in some flash memory. When I eventually looked at this again, as expected, it turned out to be a trivial exercise. Having booted Tiny Core I overwrote /dev/nvram (the 'CMOS') with some rubbish. When I next rebooted, the BIOS, on finding a corrupt CMOS checksum, silently reinitialised the NVRAM with some default data and the password prompt went away.
When Linux started up one line of the 'dmesg' file was:
DMI: FUJITSU FUTRO S900/D3003-A1, BIOS V220.127.116.11 R1.14.0 for D3003-A1x 01/27/2012
I subsequently updated the BIOS to R1.18.0 but the update obviously didn't change the password problem that was still in place at the time.
The F12 key will bring up a boot menu. (When the supervisor password was set it also brought up a prompt for a password, but that could be ignored by just hitting enter.) You then move on to a screen titled: Please select boot device:. My S900 had a USB pen drive inserted, and a Seagate 60GB drive (ST96812AS) connected to the onboard SATA port. With this combination the menu of options is:
You can select any of the items but, what ever you select this time, it does not change the default behaviour of the BIOS.
Selecting Enter Setup took me into the BIOS setup screens. The heading across the top was:
Aptio Setup Utility - Copyright (C) 2011 American Megatrends, Inc.
You are now into the BIOS but, if an unknown supervisor password is set, only as a user, not an administrator. (The Main screen will show the Access Level as User.) For example hitting F3 for 'loading the Optimised Defaults' results in a pop-up screen saying Administrator rights required.
As a user you can view the current settings but there is very little that you can actually select or change. For example, when I was in the Boot screen I couldn't change anything other than the Bootup Numlock State, Quiet Boot and something to do with Option ROM Messages.
As noted on the hardware page my S900 came with no internal flash memory and hence no operating system. The datasheet for the S900 shows that it should come with either eLux or Windows Embedded Standard. (eLux support now migrated to unicon-software)
My unit does have a label for Windows "Embedded Standard 7 (WS7E)"
Any comments? email me. Added July 2013 Last update May 2017