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+* `boot/`: This folder is the central place for all built files. This
+  includes the kernel image, rootfs, gateware, etc. This directory also
+  includes everything the TFTP server has to access.
+* `build/`: Docker build environment.
+* `buildroot/`: Buildroot configuration files.
+* `doc/`: Documentation.
+* `doc/copying`: Licenses.
+* `gateware/`: FPGA source.
+* `linux/`: Software that runs on the controller.
+* `opensbi/`: OpenSBI configuration files and source fragments.