Discussion of the supporting files and directories to support the TI AM335X EVM, as an example of porting a specific board, based on the following defining values.
First, from configs/am335x_evm_defconfig:
CONFIG_ARM=y CONFIG_ARCH_OMAP2PLUS=y CONFIG_TI_COMMON_CMD_OPTIONS=y CONFIG_AM33XX=y CONFIG_SPL=y
In addition:
ARCH=armCPU=armv7VENDOR=tiBOARD=am335xBOARDDIR=board/ti/am335xSOC=am33xxSYS_CONFIG_NAME=am335x_evm