The following vendor proprietary source files are required to build. These files are available from Broadcom under NDA through a common CSP.
SW-BCM68620_<VER>.zip - Broadcom BAL source and Maple SDK.sdk-all-<SDK_VER>.tar.gz - Broadcom Qumran SDK.ACCTON_BAL_<BAL_VER>-<ACCTON_VER>.patch - Accton/Edgecore's patch.OPENOLT_BAL_<BAL_VER>.patch - ONF's patch to BAL (to enable BAL to compile with C++ based openolt)Copy the above four files to this folder before running make in the top level directory.