FC3, Sharp MM20, Synaptics touch pad

I've just done a clean install of FC3 on a Sharp MM20, and I'm hitting a wall trying to get the touchpad working. External USB mouse works fine. I have the latest synaptics driver compiled and installed. Xorg.0.log shows:

(II) Synaptics touchpad driver version 0.13.6
Touchpad no synaptics event device found (checked 3 nodes)
(**) Option "Device" "/dev/psaux"
(EE) xf86OpenSerial: Cannot open device /dev/psaux
       No such file or directory.
Synaptics driver unable to open device
(EE) PreInit failed for input device "Touchpad"
(II) UnloadModule: "synaptics"

There is indeed no /dev/psaux, though I have made it twice with MAKEDEV. It disappears a each reboot. Also I note that the driver seems to be saying that it does not see the touchpad.

My xorg.conf is below. If I use the two commented lines in the server layout section te replace the two following lines, the system hangs on boot. Can anyone help?

Frank.

# XFree86 4 configuration created by pyxf86config

Section "ServerLayout"
       Identifier     "Default Layout"
       Screen      0  "Screen0" 0 0
#       InputDevice    "Touchpad" "CorePointer"
#       InputDevice    "USBMouse" "SendCoreEvents"
       InputDevice    "USBMouse" "CorePointer"
       InputDevice    "Touchpad" "SendCoreEvents"
       InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"

# RgbPath is the location of the RGB database. Note, this is the name of the
# file minus the extension (like ".txt" or ".db"). There is normally
# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "unix/:7100"
EndSection

Section "Module"
       Load  "dbe"
       Load  "extmod"
       Load  "fbdevhw"
       Load  "glx"
       Load  "record"
       Load  "freetype"
       Load  "type1"
       Load  "dri"
       Load "synaptics"
EndSection

Section "ServerFlags"
       Option      "AllowMouseOpenFail" "yes"
EndSection

Section "InputDevice"

# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
#       Option  "Xleds"         "1 2 3"
# To disable the XKEYBOARD extension, uncomment XkbDisable.
#       Option  "XkbDisable"
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults).  For example, for a non-U.S.
# keyboard, you will probably want to use:
#       Option  "XkbModel"      "pc102"
# If you have a US Microsoft Natural keyboard, you can use:
#       Option  "XkbModel"      "microsoft"
#
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
#       Option  "XkbLayout"     "de"
# or:
#       Option  "XkbLayout"     "de"
#       Option  "XkbVariant"    "nodeadkeys"
#
# If you'd like to switch the positions of your capslock and
# control keys, use:
#       Option  "XkbOptions"    "ctrl:swapcaps"
# Or if you just want both to be control, use:
#       Option  "XkbOptions"    "ctrl:nocaps"
#
       Identifier  "Keyboard0"
       Driver      "kbd"
       Option      "XkbModel" "pc105"
       Option      "XkbLayout" "us"
EndSection

Section "InputDevice"
       Identifier "USBMouse"
       Driver      "mouse"
       Option      "Protocol" "IMPS/2"
       Option      "Device" "/dev/input/mice"
       Option      "ZAxisMapping" "4 5"
       Option      "Emulate3Buttons" "no"
EndSection

Section "InputDevice"
       Identifier "Touchpad"
       Driver "synaptics"
       Option "Device" "/dev/psaux"
       Option "Protocol" "auto-dev"
       Option "LeftEdge" "1700"
       Option "righted" "5300"
       Option "topped" "1700"
       Option "bottomed" "4200"
       Option "fingerless" "25"
       Option "FingerHigh" "30"
       Option "MaxTapTime" "180"
       Option "MaxTapMove" "220"
       Option "VertScrollDelta" "100"
       Option "misnamed" "0.06"
       Option "MaxSpeed" "0.12"
       Option "AccelFactor" "0.0010"
       Option "SHMConfig" "on"
       Option "ZAxisMapping" "4 5"
       Option "Emulate3Buttons" "no"
EndSection

Section "Monitor"
       Identifier   "Monitor0"
       VendorName   "Monitor Vendor"
       ModelName    "LCD Panel 1024x768"
       HorizSync    31.5 - 48.5
       VertRefresh  40.0 - 70.0
       Option      "dpms"
EndSection

Section "Device"
       Identifier  "Videocard0"
       Driver      "radeon"
       VendorName  "Videocard vendor"
       BoardName   "ATI Radeon Mobility M6"
EndSection

Section "Screen"
       Identifier "Screen0"
       Device     "Videocard0"
       Monitor    "Monitor0"
       DefaultDepth     24
       SubSection "Display"
               Viewport   0 0
               Depth     16
               Modes    "800x600" "640x480"
       EndSubSection
       SubSection "Display"
               Viewport   0 0
               Depth     24
               Modes    "1024x768" "800x600" "640x480"
       EndSubSection
EndSection

Section "DRI"
       Group        0
       Mode         0666
EndSection