List of Supported Boards - renesas/Arduino GitHub Wiki
Supported Boards
RL78/G24 Fast Prototyping Board
RL78/G23-128p Fast Prototyping Board
RL78/G23-64p Fast Prototyping Board
RL78/G22 Fast Prototyping Board
RL78/G16 Fast Prototyping Board
RL78/G15 Fast Prototyping Board