renesas-ra/modmachine: Allow boards to provide custom bootloader code.

And expose the machine_bootloader() C function so it can be used elsewhere.

ports/renesas-ra/boardctrl.h

@@ -37,6 +37,10 @@
 #define MICROPY_BOARD_STARTUP powerctrl_check_enter_bootloader
 #endif
 
+#ifndef MICROPY_BOARD_ENTER_BOOTLOADER
+#define MICROPY_BOARD_ENTER_BOOTLOADER(nargs, args)
+#endif
+
 #ifndef MICROPY_BOARD_EARLY_INIT
 #define MICROPY_BOARD_EARLY_INIT()
 #endif

ports/renesas-ra/modmachine.c

@@ -47,6 +47,7 @@
 #include "gccollect.h"
 #include "irq.h"
 #include "powerctrl.h"
+#include "boardctrl.h"
 #include "pybthread.h"
 #include "storage.h"
 #include "pin.h"
@@ -182,13 +183,15 @@ STATIC mp_obj_t machine_soft_reset(void) {
 MP_DEFINE_CONST_FUN_OBJ_0(machine_soft_reset_obj, machine_soft_reset);
 
 // Activate the bootloader without BOOT* pins.
-STATIC NORETURN mp_obj_t machine_bootloader(size_t n_args, const mp_obj_t *args) {
+NORETURN mp_obj_t machine_bootloader(size_t n_args, const mp_obj_t *args) {
     #if MICROPY_HW_ENABLE_STORAGE
     storage_flush();
     #endif
 
     __disable_irq();
 
+    MICROPY_BOARD_ENTER_BOOTLOADER(n_args, args);
+
     #if MICROPY_HW_USES_BOOTLOADER
     // ToDo: need to review how to implement
 

ports/renesas-ra/modmachine.h

@@ -49,6 +49,7 @@ void machine_deinit(void);
 void machine_pin_init(void);
 void machine_pin_deinit(void);
 void machine_i2s_init0(void);
+NORETURN mp_obj_t machine_bootloader(size_t n_args, const mp_obj_t *args);
 
 MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(machine_info_obj);
 MP_DECLARE_CONST_FUN_OBJ_0(machine_unique_id_obj);