From 52d7b0809182ccc875d0afc2bfaa4ccfb4ce8e32 Mon Sep 17 00:00:00 2001
From: PhysicistJohn <54456354+PhysicistJohn@users.noreply.github.com>
Date: Fri, 10 Jul 2026 18:08:26 -0700
Subject: [PATCH] build: reject unknown firmware targets

---
 Makefile | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index 85410be..4b465ea 100644
--- a/Makefile
+++ b/Makefile
@@ -3,11 +3,12 @@
 # NOTE: Can be overridden externally.
 #
 
-#Build target
-ifeq ($(TARGET),)
-  TARGET = F072
-else
-  TARGET = F303
+# Build target.
+TARGET ?= F072
+ifneq ($(TARGET),F072)
+  ifneq ($(TARGET),F303)
+    $(error Unsupported TARGET '$(TARGET)'; expected F072 or F303)
+  endif
 endif
 
 # Compiler options here.