newbie question: where to begin with the code ?

[Philippe CABANNES]

I´m currently trying to understand the code.                          
I´ve tried with the file crt0.s in my build directory but i really    
have big difficulties.                                                
I wonder if it´s the way to begin with this file.                     
                                                                      
Other question : how does work ljmp **,** ? Cause i only know ljmp    
with one argument. I didn´t find this information.                    
                                                                      
Thanks in advance                                                     
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