decompile bg_regs data

asm/link.s

@@ -200,7 +200,7 @@ sub_80095BC: @ 80095BC
 	str r1, [r0, 0x4]
 	movs r1, 0
 	str r1, [r0, 0x8]
-	ldr r0, _0800963C @ =gUnknown_8231E20
+	ldr r0, _0800963C @ =gBGControlRegOffsets
 	adds r6, r0
 	ldrb r0, [r6]
 	lsls r4, 8
@@ -219,7 +219,7 @@ _0800962C: .4byte 0x040000d4
 _08009630: .4byte gUnknown_8232598
 _08009634: .4byte 0x80001000
 _08009638: .4byte gUnknown_3003F70
-_0800963C: .4byte gUnknown_8231E20
+_0800963C: .4byte gBGControlRegOffsets
 	thumb_func_end sub_80095BC
 
 	thumb_func_start sub_8009640

asm/overworld.s

@@ -4547,7 +4547,7 @@ sub_8056F1C: @ 8056F1C
 	movs r0, 0x46
 	adds r1, r4, 0
 	bl SetGpuReg
-	ldr r0, _08057018 @ =gUnknown_8231E10
+	ldr r0, _08057018 @ =gBLDCNTTarget2BGFlags
 	ldrh r1, [r0, 0x2]
 	ldrh r2, [r0, 0x4]
 	orrs r1, r2
@@ -4618,7 +4618,7 @@ sub_8056F1C: @ 8056F1C
 _0805700C: .4byte 0x00001f1f
 _08057010: .4byte 0x00000101
 _08057014: .4byte 0x0000ffff
-_08057018: .4byte gUnknown_8231E10
+_08057018: .4byte gBLDCNTTarget2BGFlags
 _0805701C: .4byte 0x0000070d
 _08057020: .4byte 0x00007060
 	thumb_func_end sub_8056F1C

asm/string_util.s

@@ -612,10 +612,10 @@ _0800910A:
 
 	thumb_func_start sub_8009118
 sub_8009118: @ 8009118
-	ldr r0, _0800911C @ =gUnknown_2022100
+	ldr r0, _0800911C @ =gUnknownStringVar
 	bx lr
 	.align 2, 0
-_0800911C: .4byte gUnknown_2022100
+_0800911C: .4byte gUnknownStringVar
 	thumb_func_end sub_8009118
 
 	thumb_func_start sub_8009120

data/data.s

@@ -1,13 +1,5 @@
 	.section .rodata
 
-	.incbin "baserom.gba", 0x231DD8, 0x38
-
-gUnknown_8231E10:: @ 8231E10
-	.incbin "baserom.gba", 0x231E10, 0x10
-
-gUnknown_8231E20:: @ 8231E20
-	.incbin "baserom.gba", 0x231E20, 0xC
-
 gUnknown_8231E2C:: @ 8231E2C
 	.incbin "baserom.gba", 0x231E2C, 0x10
 

ld_script.txt

@@ -401,6 +401,7 @@ SECTIONS {
         src/text.o(.rodata);
         data/text.o(.rodata);
         src/sprite.o(.rodata);
+        src/bg_regs.o(.rodata);
         data/data.o(.rodata);
         src/m4a_tables.o(.rodata);
         data/sound_data.o(.rodata);

src/bg_regs.c

@@ -0,0 +1,53 @@
+#include "global.h"
+
+vu16 *const gBGControlRegs[] =
+{
+    &REG_BG0CNT,
+    &REG_BG1CNT,
+    &REG_BG2CNT,
+    &REG_BG3CNT,
+};
+
+vu16 *const gBGHOffsetRegs[] =
+{
+    &REG_BG0HOFS,
+    &REG_BG1HOFS,
+    &REG_BG2HOFS,
+    &REG_BG3HOFS,
+};
+
+vu16 *const gBGVOffsetRegs[] =
+{
+    &REG_BG0VOFS,
+    &REG_BG1VOFS,
+    &REG_BG2VOFS,
+    &REG_BG3VOFS,
+};
+
+const u16 gDISPCNTBGFlags[] = { DISPCNT_BG0_ON, DISPCNT_BG1_ON, DISPCNT_BG2_ON, DISPCNT_BG3_ON };
+const u16 gBLDCNTTarget2BGFlags[] = { BLDCNT_TGT2_BG0, BLDCNT_TGT2_BG1, BLDCNT_TGT2_BG2, BLDCNT_TGT2_BG3 };
+const u16 gBLDCNTTarget1BGFlags[] = { BLDCNT_TGT1_BG0, BLDCNT_TGT1_BG1, BLDCNT_TGT1_BG2, BLDCNT_TGT1_BG3 };
+
+const u8 gBGControlRegOffsets[] =
+{
+    REG_OFFSET_BG0CNT,
+    REG_OFFSET_BG1CNT,
+    REG_OFFSET_BG2CNT,
+    REG_OFFSET_BG3CNT,
+};
+
+const u8 gBGHOffsetRegOffsets[] =
+{
+    REG_OFFSET_BG0HOFS,
+    REG_OFFSET_BG1HOFS,
+    REG_OFFSET_BG2HOFS,
+    REG_OFFSET_BG3HOFS,
+};
+
+const u8 gBGVOffsetRegOffsets[] =
+{
+    REG_OFFSET_BG0VOFS,
+    REG_OFFSET_BG1VOFS,
+    REG_OFFSET_BG2VOFS,
+    REG_OFFSET_BG3VOFS,
+};

sym_ewram.txt

@@ -47,7 +47,7 @@ gStringVar3: @ 2021D04
 gStringVar4: @ 2021D18
 	.space 0x3E8
 
-gUnknown_2022100: @ 2022100
+gUnknownStringVar: @ 2022100
 	.space 0x10
 
 gUnknown_2022110: @ 2022110