[U-Boot-Users] Modifying U-Boot

[Mustafa Çayır]

Hi,
when modifying u-boot for a custom design board, is schematic of the board is required? 
i have datasheet of the board that explain memory map, bridge and cpu type, ex. is this datasheet sufficient to modify u-boot?
if schematic is required, what are names of u-boot source files that must be modifyed according to schematic?

Best regards,
Mustafa