On this picture you have the bottom face of the PS3 Blue Ray Drive's board controller :
Here the BMD-001 Rev1 board :
Most of the components can be accessed on their pins to put an oscilloscope probe, except the main processor SONY CXD5065GB-1 (BMD-002 board) or CXD5063AGG-1 (BMD-001 board), and the flash memory SPANSION AL008D0043-01 (BMD-002 board) or S99-50111-001 (BMD-001 board), because they are BGA.
So I had these components taken out to have access to their signals on the PCB :
Here the BMD-002 Rev 3 board :
So now I can do some reverse engineering on the schematics !