.../configure ... --cross-cc-xtensa=xtensa-dc232b-elf-gcc --cross-cc-xtensaeb=xtensa-test_kc705_be-elf-gcc
make check-tcg CORE=visionp6cnn_ao_exls CC=xtensa-visionp6cnn_ao_exls-elf-gcc
make clean-tcg

To run specific test:

make -C tests/tcg/xtensa-softmmu/ run-test_exclusive CORE=visionp6cnn_ao_exls CC=xtensa-visionp6cnn_ao_exls-elf-gcc