AP_Bootloader: support STM32G4

Tools/AP_Bootloader/bl_protocol.cpp

@@ -251,6 +251,9 @@ jump_to_app()
 #if defined(STM32H7)
     rccDisableAPB1L(~0);
     rccDisableAPB1H(~0);
+#elif defined(STM32G4)
+    rccDisableAPB1R1(~0);
+    rccDisableAPB1R2(~0);
 #else
     rccDisableAPB1(~0);
 #endif

Tools/AP_Bootloader/mcu_g4.h

@@ -0,0 +1,16 @@
+/*
+  MCU tables for STM32G4
+ */
+
+#if defined(STM32G4)
+
+#define STM32_UNKNOWN 0
+
+mcu_des_t mcu_descriptions[] = {
+};
+
+const mcu_rev_t silicon_revs[] = {
+};
+
+#endif // STM32G4
+

Tools/AP_Bootloader/support.cpp

@@ -16,6 +16,7 @@
 #include "mcu_f4.h"
 #include "mcu_f7.h"
 #include "mcu_h7.h"
+#include "mcu_g4.h"
 
 // optional uprintf() code for debug
 // #define BOOTLOADER_DEBUG SD1
@@ -71,7 +72,7 @@ void cout(uint8_t *data, uint32_t len)
 #endif // BOOTLOADER_DEV_LIST
 
 static uint32_t flash_base_page;
-static uint8_t num_pages;
+static uint16_t num_pages;
 static const uint8_t *flash_base = (const uint8_t *)(0x08000000 + (FLASH_BOOTLOADER_LOAD_KB + APP_START_OFFSET_KB)*1024U);
 
 /*