The U-Boot sources for Roku HDRTV v9.4.0 appear to be in violation of GPLv2. The code unconditionally statically links against against a few Mstar libraries, but neither the sources nor licenses for those libraries are made available. Without them, the U-Boot sources simply cannot be built.
From the U-Boot Makefile:
LIBS += ../MstarApp/libmsapp.a
LIBS += ../MstarApp/src/fs/libmsfs.a
LIBS += ../MstarApp/src/secure/libmssecure.a
LIBS += ../MstarCore/libmscore.a
LIBS += ../MstarCore/src/drivers/libdrivers.a
LIBS += ../MstarCustomer/$(CUSTOMER)/libmscustomer.a
## Utopia Lib:
## The --gc-sections will remove the unused section part, so we included all utopia lib.
LIBS += lib/mstar/*.a