PROCESSOR-SDK-AM64X: what the relationship u-boot/configs/xxx_defconfig and Kconfig?

Hello,
U-Boot can support many configurations, including device drivers, security features, etc. Users have to select which features to use for a board. Some "default" configurations for a platform can be found in u-boot/configs folder. For AM64x platform, am64x_evm_r5_defconfig has the default configuration for the first stage bootloader which will run on the R5 core, and am64x_evm_a53_defconfig has the default configuration for the second stage bootloader which will run on the A53 core. The make xxx_defconfig will generate a .config file with the default configuration found in xxx_defconfig. Then if you build with 'make' command, it will use the configuration saved in .config. Essentially, the xxx_defconfig is a way to save a default configuration for a particular board. Menuconfig is used to change from the default configuration, so it will modify the generated .config file. You do not need to modify Kconfig file. If you did not intend to change from the default configuration, do not use 'make menuconfig' and you can go ahead and build with the 'make' command.

get it, Thanks you!