diff --git a/.idea/cmake.xml b/.idea/cmake.xml
index e4a08eaa6..ebc6a0570 100644
--- a/.idea/cmake.xml
+++ b/.idea/cmake.xml
@@ -75,7 +75,7 @@
       <configuration PROFILE_NAME="stm32u575nucleo" ENABLED="false" CONFIG_NAME="Debug" GENERATION_OPTIONS="-DBOARD=stm32u575nucleo -DLOG=3" />
       <configuration PROFILE_NAME="stm32u5a5nucleo" ENABLED="false" CONFIG_NAME="Debug" GENERATION_OPTIONS="-DBOARD=stm32u5a5nucleo -DLOG=3 -DLOGGER=RTT" />
       <configuration PROFILE_NAME="ra2a1" ENABLED="false" CONFIG_NAME="Debug" GENERATION_OPTIONS="-DBOARD=ra2a1_ek -DLOG=3 -DLOGGER=RTT" />
-      <configuration PROFILE_NAME="ra4m1" ENABLED="true" CONFIG_NAME="Debug" GENERATION_OPTIONS="-DBOARD=ra4m1_ek -DLOG=3 -DLOGGER=RTT" />
+      <configuration PROFILE_NAME="ra4m1" ENABLED="false" CONFIG_NAME="Debug" GENERATION_OPTIONS="-DBOARD=ra4m1_ek -DLOG=3 -DLOGGER=RTT" />
       <configuration PROFILE_NAME="ra6m1" ENABLED="false" CONFIG_NAME="Debug" GENERATION_OPTIONS="-DBOARD=ra6m1_ek -DLOG=3 -DLOGGER=RTT" />
       <configuration PROFILE_NAME="ra6m5" ENABLED="false" CONFIG_NAME="Debug" GENERATION_OPTIONS="-DBOARD=ra6m5_ek -DLOG=3 -DLOGGER=RTT -DTRACE_ETM=1" />
       <configuration PROFILE_NAME="ra6m5 PORT0" ENABLED="false" CONFIG_NAME="Debug" GENERATION_OPTIONS="-DBOARD=ra6m5_ek -DLOG=3 -DLOGGER=RTT -DTRACE_ETM=1 -DPORT=0" />
diff --git a/examples/build_system/make/rules.mk b/examples/build_system/make/rules.mk
index b02665cdd..78fce49d2 100644
--- a/examples/build_system/make/rules.mk
+++ b/examples/build_system/make/rules.mk
@@ -9,19 +9,6 @@
 # ESP32-Sx and RP2040 has its own CMake build system
 ifeq (,$(findstring $(FAMILY),espressif rp2040))
 
-# ---------------------------------------
-# Compiler Flags
-# ---------------------------------------
-
-CFLAGS += $(addprefix -I,$(INC))
-
-# Verbose mode
-ifeq ("$(V)","1")
-$(info CFLAGS  $(CFLAGS) ) $(info )
-$(info LDFLAGS $(LDFLAGS)) $(info )
-$(info ASFLAGS $(ASFLAGS)) $(info )
-endif
-
 # ---------------------------------------
 # Rules
 # ---------------------------------------
@@ -39,6 +26,19 @@ vpath %.S . $(TOP)
 
 include ${TOP}/examples/build_system/make/toolchain/arm_$(TOOLCHAIN)_rules.mk
 
+# ---------------------------------------
+# Compiler Flags
+# ---------------------------------------
+
+CFLAGS += $(addprefix -I,$(INC))
+
+# Verbose mode
+ifeq ("$(V)","1")
+$(info CFLAGS  $(CFLAGS) ) $(info )
+$(info LDFLAGS $(LDFLAGS)) $(info )
+$(info ASFLAGS $(ASFLAGS)) $(info )
+endif
+
 
 OBJ_DIRS = $(sort $(dir $(OBJ)))
 $(OBJ): | $(OBJ_DIRS)
diff --git a/hw/bsp/rx/boards/rx65n_target/rx65n_target.c b/hw/bsp/rx/boards/rx65n_target/rx65n_target.c
index 032dac810..66a319541 100644
--- a/hw/bsp/rx/boards/rx65n_target/rx65n_target.c
+++ b/hw/bsp/rx/boards/rx65n_target/rx65n_target.c
@@ -249,9 +249,10 @@ void board_init(void)
   EN(SCI5, TEI5)     = 1;
 
   /* Enable USB0 */
+  unsigned short oldPRCR = SYSTEM.PRCR.WORD;
   SYSTEM.PRCR.WORD = SYSTEM_PRCR_PRKEY | SYSTEM_PRCR_PRC1;
   MSTP(USB0) = 0;
-  SYSTEM.PRCR.WORD = SYSTEM_PRCR_PRKEY;
+  SYSTEM.PRCR.WORD = SYSTEM_PRCR_PRKEY | oldPRCR;
 
   /* setup USBI0 interrupt. */
   IR(USB0, USBI0)  = 0;
@@ -277,6 +278,7 @@ int board_uart_read(uint8_t* buf, int len)
   sci_buf[1].buf = buf;
   sci_buf[1].cnt = len;
   SCI5.SCR.BYTE |= SCI_SCR_RE | SCI_SCR_RIE;
+  // TODO change to non blocking, return -1 immediately if no data
   while (SCI5.SCR.BIT.RE) ;
   return len - sci_buf[1].cnt;
 }