Is the Game Boy Advance slot on the DS region-locked?

Topic: What is the slot called on the bottom on a DS Lite? nintendo ds gameboy slot GBA games Best DS games Best 3DS games LATEST VIDEOS FROM gamesradar The best Nintendo DS games ever, starting with slot Known nintendo switch lite cartridge slot Durable Original DS Game System; Includes slots for both Game Boy Advance Games & Nintendo DS Games Product Details Is Discontinued By Manufacturer: No

nintendo ds gameboy slot My Flash cart is in Slot 1 and works fine for DS Roms & Mp3s, but it will not play GBA Roms as it seeks for some Slot 2 cartridge which I do not