diff --git a/asm/link.s b/asm/link.s
index b25568209..38629bff9 100644
--- a/asm/link.s
+++ b/asm/link.s
@@ -7,44 +7,6 @@
 
 // RFU; bss indicates that no file boundary exists here
 
-	thumb_func_start sub_800BEC0
-sub_800BEC0: @ 800BEC0
-	push {r4,lr}
-	bl rfu_REQBN_softReset_and_checkID
-	adds r4, r0, 0
-	ldr r0, =0x00008001
-	cmp r4, r0
-	bne _0800BED4
-	ldr r1, =gUnknown_03004140
-	movs r0, 0x1
-	strb r0, [r1, 0x8]
-_0800BED4:
-	ldr r0, =gUnknown_03004140
-	ldrb r2, [r0, 0x4]
-	adds r1, r0, 0
-	cmp r2, 0x17
-	beq _0800BEE8
-	cmp r2, 0x1
-	beq _0800BEE8
-	movs r0, 0
-	strb r0, [r1, 0x5]
-	strb r0, [r1, 0x4]
-_0800BEE8:
-	movs r0, 0
-	strb r0, [r1, 0x7]
-	strb r0, [r1, 0xD]
-	strb r0, [r1, 0x1]
-	strb r0, [r1]
-	movs r0, 0xFF
-	strb r0, [r1, 0x6]
-	bl sub_800D610
-	adds r0, r4, 0
-	pop {r4}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_800BEC0
-
 	thumb_func_start rfu_REQ_sendData_wrapper
 rfu_REQ_sendData_wrapper: @ 800BF0C
 	push {lr}
diff --git a/include/librfu.h b/include/librfu.h
index 0cf781d73..609fffea2 100644
--- a/include/librfu.h
+++ b/include/librfu.h
@@ -108,3 +108,4 @@ extern struct RfuStruct *gRfuState;
 void STWI_init_all(struct RfuIntrStruct *interruptStruct, IntrFunc *interrupt, bool8 copyInterruptToRam);
 void rfu_REQ_stopMode(void);
 void rfu_waitREQComplete(void);
+u32 rfu_REQBN_softReset_and_checkID(void);
diff --git a/include/link_rfu.h b/include/link_rfu.h
index 62cff87b9..a395119fa 100644
--- a/include/link_rfu.h
+++ b/include/link_rfu.h
@@ -3,8 +3,24 @@
 
 // Exported type declarations
 
+struct UnkRfuStruct_1 {
+    u8 unk_00;
+    u8 unk_01;
+    u8 unk_02;
+    u8 unk_03;
+    u8 unk_04;
+    u8 unk_05;
+    u8 unk_06;
+    u8 unk_07;
+    u8 unk_08;
+    u8 filler_09[4];
+    u8 unk_0d;
+};
+
 // Exported RAM declarations
 
+extern struct UnkRfuStruct_1 gUnknown_03004140;
+
 // Exported ROM declarations
 u32 sub_800BEC0(void);
 void sub_800E700(void);
diff --git a/src/link.c b/src/link.c
index aa9e0a65d..645fcc182 100644
--- a/src/link.c
+++ b/src/link.c
@@ -143,12 +143,14 @@ static u16 LinkTestCalcBlockChecksum(const u16 *src, u16 size);
 static void LinkTest_prnthex(u32 pos, u8 a0, u8 a1, u8 a2);
 static void LinkCB_RequestPlayerDataExchange(void);
 static void Task_PrintTestData(u8 taskId);
+
 static void sub_800AC80(void);
 static void sub_800ACAC(void);
 static void sub_800AD5C(void);
 static void sub_800AD88(void);
 static void sub_800AE30(void);
 static void sub_800AE5C(void);
+
 static void CheckErrorStatus(void);
 static void CB2_PrintErrorMessage(void);
 static bool8 IsSioMultiMaster(void);
@@ -159,6 +161,7 @@ static void CheckMasterOrSlave(void);
 static void InitTimer(void);
 static void EnqueueSendCmd(u16 *sendCmd);
 static void DequeueRecvCmds(u16 (*recvCmds)[CMD_LENGTH]);
+
 static void StartTransfer(void);
 static bool8 DoHandshake(void);
 static void DoRecv(void);
@@ -166,6 +169,8 @@ static void DoSend(void);
 static void StopTimer(void);
 static void SendRecvDone(void);
 
+void sub_800D610(void);
+
 // .rodata
 
 ALIGNED(4) const u16 gWirelessLinkDisplayPal[] = INCBIN_U16("graphics/interface/wireless_link_display.gbapal");
@@ -2436,3 +2441,29 @@ void ResetRecvBuffer(void)
         }
     }
 }
+
+// rfu
+
+u32 sub_800BEC0(void)
+{
+    u32 r4;
+    u8 r2;
+
+    r4 = rfu_REQBN_softReset_and_checkID();
+    if (r4 == 0x8001)
+    {
+        gUnknown_03004140.unk_08 = 1;
+    }
+    if (gUnknown_03004140.unk_04 != 0x17 && gUnknown_03004140.unk_04 != 0x01)
+    {
+        gUnknown_03004140.unk_05 = 0;
+        gUnknown_03004140.unk_04 = 0;
+    }
+    gUnknown_03004140.unk_07 = 0;
+    gUnknown_03004140.unk_0d = 0;
+    gUnknown_03004140.unk_01 = 0;
+    gUnknown_03004140.unk_00 = 0;
+    gUnknown_03004140.unk_06 = -1;
+    sub_800D610();
+    return r4;
+}
diff --git a/src/link_rfu.c b/src/link_rfu.c
index 43169a275..f654b9430 100644
--- a/src/link_rfu.c
+++ b/src/link_rfu.c
@@ -1,9 +1,13 @@
 
 // Includes
 #include "global.h"
+#include "link.h"
+#include "link_rfu.h"
 
 // Static type declarations
 
+struct UnkRfuStruct_1 gUnknown_03004140;
+
 // Static RAM declarations
 IWRAM_DATA u8 gUnknown_03000D78[8];
 IWRAM_DATA u8 gUnknown_03000D80[16];