Master sonic offers "PlaybootDs"A utility almost useless and therefore indispensable. PlaybootDs can launch your homebrew with an intro from another console, 6 in total (Game Cube, Game Boy Advance, Play Station, Play Station 2, Xbox, and Genesis).
For this fact you should copy the 2 binary PlaybootDs.nds and PlaybootDsConfig (eng). Kts or PlaybootDsConfig (sp). Kts then PlaybootDs directory / to the root of your linker. Start PlaybootDsConfig to choose which will play the intro to launch your homebrew, your console will turn off and a config file will be created in the directory PlaybootDs /. Put your homebrew rom.nds renamed in the same directory and run the binary PlaybootDs.nds.