Add explanation for BOOTUP_B_* removal

dmitry-shechtman · dmitry-shechtman · commit debac9916511 · 2025-08-13T15:19:58.000+03:00
diff --git a/hardware_compat.inc b/hardware_compat.inc
@@ -385,6 +385,8 @@ def OAM_B equ OAM_SIZE
 
 def BOOTUPB_B_AGB equ B_BOOTUP_B_AGB
 
+; These values should not be relied upon; see
+; https://gbdev.io/pandocs/Power_Up_Sequence.html#cgbdmg_b
     def BOOTUP_B_CGB equ 0 << B_BOOTUP_B_AGB
     def BOOTUP_B_AGB equ 1 << B_BOOTUP_B_AGB
 
