lpc: don't assume mb revision

reform2-lpc-fw/src/boards/reform2/board_reform2.c

@@ -37,13 +37,13 @@
 #define REFORM_MBREV_20_R3 13 // R2 with "NTC instead of RNG/SS" fix
 #define REFORM_MBREV_25_R2 25 // motherboard 2.5
 
-#define REFORM_MOTHERBOARD_REV REFORM_MBREV_25_R2
-
 // don't forget to set this to the correct rev for your motherboard!
-#ifndef REFORM_MOTHERBOARD_REV
-#  define REFORM_MOTHERBOARD_REV REFORM_MBREV_20_R3
-#endif
-#define REF2_DEBUG 1
+// if you have a motherboard made in 2023 (2.5 R-2):
+//#define REFORM_MOTHERBOARD_REV REFORM_MBREV_25_R2
+// if you have a motherboard made before 2023 (2.0 R-3):
+//#define REFORM_MOTHERBOARD_REV REFORM_MBREV_20_R3
+
+//#define REF2_DEBUG 1
 #define FW_STRING1 "MREF2LPC"
 #if REFORM_MOTHERBOARD_REV == 2
 #  define FW_STRING2 "D2"