all the small tools (from booting, kernel loading, e2 loading, scripts, ...) print out so-called debug information to the error console.
connecting to the box via rs232 using a suitable terminal (putty, admin tool, ...) enables you to watch this output. all the information can then be saved to file and being attached here.
SO: we don't speak about any log file created on your hdd or other folder of your image - we are asking to CREATE a log using the rs232 connection and a terminal window/tool