Help me understand more about coreboot

Hello

I am a student from tehran university in iran and I am interested to 
booting system's and I research in this field
I compiled compiled and build your project in the qemu and run 
successfully but i have problem if i want to changing message that show 
in the qemu.

  for this I changing some printf() function in file  
/coreboot/payloads/external/Seabios/seabios/src/boot.c
  and then commit this changing and use make to recompiling project but 
nothing changing and then use "make clean " for deleting all the 
compiled file and recompile all of the project again by "make" and after 
this i see all of the my changing in the 
/coreboot/payloads/external/Seabios/seabios/src/boot.c is deleted and 
even my git commited is deleted .

how build system work this happens?

how to solve this problem and changing the massage in the qemu terminal?

and please explain to me source for this subject (i search in coreboot 
documentation but i can't find proper source)

With respect and apologies for any English grammatical errors in the 
text.

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