OS Builder/Enable taptoclick
Tap to click has been disabled by request of many deployments. To enable it for ALPS, Synaptics, and AVC Touch-pads you must alter a few files:
For ALPS and Synaptics:
Modify the file /etc/modprobe.d/olpc-psmouse.conf changing to the option taptoclick=0 to taptoclick=1
Two files must be altered:
Editing the configure_sentelic_fsp() section of /etc/init.d/olpc-configure and changing the "c" to "C"
Editing a register value in /usr/bin/olpc-fsp-regs so the value for register 0x42 is 87.
From AVC spec:
" 0x42 is the OPC register controlling tap to click (Disable=0xE7,Enabled=0x87)"