RIOT/tests/build_system/external_board_dirs/README.md

Test for EXTERNAL_BOARD_DIRS

This test contains two directories containing external boards, namely external_board_dir_1 and external_board_dir_2. Each contains a symlink to boards/native (so that this test does not need to maintain boards), the first is named native1 and the second native2. The variable EXTERNAL_BOARD_DIRS is set to contain both directories.

This test succeeds if:

1. make info-boards-supported lists native native1 native2
2. Building works for all three boards, e.g. by a) make BOARD=native b) make BOARD=native1 c) make BOARD=native2