How to enable USB on DM365

The USB port should be enabled by default in the kernel already, so you should just be able to plug in your USB device, though you will want to ensure you have the appropriate adapters and likely a self powered USB hub, as many common USB devices will pull more current than the port on the EVM board can provide, and the adapters for USBOTG are rare. 

If you have a custom kernel you can add in USB support in the kernel build system's menuconfig utility, so you would navigate to your kernel source directory and run a command like "make ARCH=arm CROSS_COMPILE=arm_v5t_le- menuconfig" for an old MontaVista build. This should open up the menuconfig utility where you can select options for your kernel, if you don't know where a particular option is that you want to enable or disable hit the / key to start a search, in this case you should find USB support under the Device Drivers menu. From within menuconfig select the various USB options you need to be able to support and than exit out saving your configuration, from there you just have to rebuild the kernel ("make ARCH=arm CROSS_COMPILE=arm_v5t_le- uimage") and boot that new kernel (i.e. TFTP boot or reflash) to get the new support.