Run the simulation with GDB for FDPIC: ./output/host/usr/bin/bfin-buildroot-linux-uclibc-run --env operating --model bf512 output/images/vmlinux Run the simulation with GDB for FLAT: ./output/host/usr/bin/bfin-buildroot-uclinux-uclibc-run --env operating --model bf512 output/images/vmlinux The login prompt will appear in the terminal that started GDB. Tested with GDB 7.9