[coreboot] intel e2176m coreboot

hi everyone,
I'm a beginner of coreboot. I need to know where should i start. Actually i follow some steps mentioned here : "https://doc.coreboot.org/tutorial/part1.html". And i made it. after all a coreboot.rom file prepared according to my board that include intel xeon e 2176m and rom size 16MB and according to coffelake h. But i guess i made a mistake because it didn't work. But i don't know where exactly i fail or what is the missing part. Could you help me? Is there any manual document should i follow or steps or any other idea? Thanks.