diff --git a/platforms/nuttx/cmake/Platform/Generic-riscv64-unknown-elf-gcc-rv64gc.cmake b/platforms/nuttx/cmake/Platform/Generic-riscv64-unknown-elf-gcc-rv64gc.cmake
new file mode 100644
index 0000000000..94d37b084b
--- /dev/null
+++ b/platforms/nuttx/cmake/Platform/Generic-riscv64-unknown-elf-gcc-rv64gc.cmake
@@ -0,0 +1,11 @@
+
+if(CONFIG_ARCH_DPFPU)
+	message(STATUS "Enabling double FP precision hardware instructions")
+	set(cpu_flags "-march=rv64gc -mabi=lp64d -mcmodel=medany")
+else()
+	set(cpu_flags "-march=rv64imac -mabi=lp64 -mcmodel=medany")
+endif()
+
+set(CMAKE_C_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_CXX_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_ASM_FLAGS "${cpu_flags} -D__ASSEMBLY__" CACHE STRING "" FORCE)
diff --git a/platforms/nuttx/cmake/Toolchain-riscv64-unknown-elf.cmake b/platforms/nuttx/cmake/Toolchain-riscv64-unknown-elf.cmake
new file mode 100644
index 0000000000..42f10bff33
--- /dev/null
+++ b/platforms/nuttx/cmake/Toolchain-riscv64-unknown-elf.cmake
@@ -0,0 +1,44 @@
+# riscv64-unknown-elf toolchain
+
+set(CMAKE_SYSTEM_NAME Generic)
+set(CMAKE_SYSTEM_VERSION 1)
+
+set(triple riscv64-unknown-elf)
+set(CMAKE_LIBRARY_ARCHITECTURE ${triple})
+set(TOOLCHAIN_PREFIX ${triple})
+
+set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}-gcc)
+set(CMAKE_C_COMPILER_TARGET ${triple})
+
+set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++)
+set(CMAKE_CXX_COMPILER_TARGET ${triple})
+
+set(CMAKE_ASM_COMPILER ${TOOLCHAIN_PREFIX}-gcc)
+
+# needed for test compilation
+set(CMAKE_EXE_LINKER_FLAGS_INIT "--specs=nosys.specs")
+
+# compiler tools
+find_program(CMAKE_AR ${TOOLCHAIN_PREFIX}-gcc-ar)
+find_program(CMAKE_GDB ${TOOLCHAIN_PREFIX}-gdb)
+find_program(CMAKE_LD ${TOOLCHAIN_PREFIX}-ld)
+find_program(CMAKE_LINKER ${TOOLCHAIN_PREFIX}-ld)
+find_program(CMAKE_NM ${TOOLCHAIN_PREFIX}-gcc-nm)
+find_program(CMAKE_OBJCOPY ${TOOLCHAIN_PREFIX}-objcopy)
+find_program(CMAKE_OBJDUMP ${TOOLCHAIN_PREFIX}-objdump)
+find_program(CMAKE_RANLIB ${TOOLCHAIN_PREFIX}-gcc-ranlib)
+find_program(CMAKE_STRIP ${TOOLCHAIN_PREFIX}-strip)
+
+set(CMAKE_FIND_ROOT_PATH get_file_component(${CMAKE_C_COMPILER} PATH))
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+
+# os tools
+foreach(tool grep make)
+	string(TOUPPER ${tool} TOOL)
+	find_program(${TOOL} ${tool})
+	if(NOT ${TOOL})
+		message(FATAL_ERROR "could not find ${tool}")
+	endif()
+endforeach()