The RTSM supports a virtual file system so that (by default) /writeable on the target maps to the DS-5 Workspace on the host. So if you put something in the DS-5 Workspace on the host it will show up in /writeable on the target and vice versa. But the virtual file system doesn't support all of the usual Linux filesystem operations (sym links, case sensitivity, permissions). I don't recommend trying to build a kernel or kernel modules using this.