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-rw-r--r--keyboards/atreus/readme.md2
-rw-r--r--keyboards/atreus/rules.mk3
2 files changed, 5 insertions, 0 deletions
diff --git a/keyboards/atreus/readme.md b/keyboards/atreus/readme.md
index 6a86ff2e00..0756c186c4 100644
--- a/keyboards/atreus/readme.md
+++ b/keyboards/atreus/readme.md
@@ -16,4 +16,6 @@ Make example for this keyboard (after setting up your build environment):
Unlike the TMK firmware, this command should be run from the root of
the repository, not the directory containing this readme.
+If your keyboard layout is a mirror image of what you expected (i.e. you do not get QWERTY on the left but YTREWQ on the right), then you have an A-Star powered Atreus (older than March 2016) with PCB labels facing *down* instead of up. Specify that by adding `PCBDOWN=yes` to your `make` commands.
+
See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
diff --git a/keyboards/atreus/rules.mk b/keyboards/atreus/rules.mk
index 2c8418beb7..2488fd5e87 100644
--- a/keyboards/atreus/rules.mk
+++ b/keyboards/atreus/rules.mk
@@ -5,6 +5,9 @@ ifdef TEENSY2
ATREUS_UPLOAD_COMMAND = teensy_loader_cli -w -mmcu=$(MCU) $(TARGET).hex
else
OPT_DEFS += -DATREUS_ASTAR
+ifdef PCBDOWN
+ OPT_DEFS += -DPCBDOWN
+endif
ATREUS_UPLOAD_COMMAND = while [ ! -r $(USB) ]; do sleep 1; done; \
avrdude -p $(MCU) -c avr109 -U flash:w:$(TARGET).hex -P $(USB)
endif