🩹 Fix MINITRONICS build (using env:mega1281)

Minitronics board uses a 1281 (with less pins), not a 1280. The environment for it seems to be missing. Add it.
MarlinFirmware · Jun 4, 2024 · e244af2 · e244af2
1 parent cb3209b
commit e244af2
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diff --git a/Marlin/src/pins/pins.h b/Marlin/src/pins/pins.h
@@ -364,7 +364,7 @@
 //
 
 #elif MB(MINITRONICS)
-  #include "mega/pins_MINITRONICS.h"                // ATmega1281                           env:mega1280
+  #include "mega/pins_MINITRONICS.h"                // ATmega1281                           env:mega1281
 #elif MB(SILVER_GATE)
   #include "mega/pins_SILVER_GATE.h"                // ATmega2561                           env:mega2560
 

diff --git a/ini/avr.ini b/ini/avr.ini
@@ -63,6 +63,13 @@ build_flags         = ${common_avr8.build_flags} -fno-tree-scev-cprop -fno-split
 extends  = mega_extended_optimized
 board    = megaatmega1280
 
+#
+# ATmega1281
+#
+[env:mega1281]
+extends                   = common_avr8
+board                     = ATmega1281
+
 #
 # MightyBoard ATmega2560
 #