AP_Bootloader: support building on STM32H7

Tools/AP_Bootloader/bl_protocol.cpp

@@ -222,7 +222,12 @@ jump_to_app()
     led_set(LED_OFF);
 
     // resetting the clocks is needed for loading NuttX
+#if defined(STM32H7)
+    rccDisableAPB1L(~0);
+    rccDisableAPB1H(~0);
+#else
     rccDisableAPB1(~0);
+#endif
     rccDisableAPB2(~0);
 #if HAL_USE_SERIAL_USB == TRUE    
     rccResetOTG_FS();

Tools/AP_Bootloader/mcu_h7.h

@@ -0,0 +1,17 @@
+/*
+  MCU tables for STM32H7
+ */
+
+#if defined(STM32H7)
+
+#define STM32_UNKNOWN	0
+
+mcu_des_t mcu_descriptions[] = {
+    { STM32_UNKNOWN,	"STM32H7?????",		'?'},
+};
+
+const mcu_rev_t silicon_revs[] = {
+};
+
+#endif // STM32H7
+

Tools/AP_Bootloader/support.cpp

@@ -12,6 +12,7 @@
 #include "support.h"
 #include "mcu_f4.h"
 #include "mcu_f7.h"
+#include "mcu_h7.h"
 
 static BaseChannel *uarts[] = { BOOTLOADER_DEV_LIST };
 #if HAL_USE_SERIAL == TRUE
@@ -113,6 +114,9 @@ void flash_func_erase_sector(uint32_t sector)
 // read one-time programmable memory
 uint32_t flash_func_read_otp(uint32_t idx)
 {
+#ifndef OTP_SIZE
+    return 0;
+#else
     if (idx & 3) {
         return 0;
     }
@@ -122,6 +126,7 @@ uint32_t flash_func_read_otp(uint32_t idx)
     }
 
     return *(uint32_t *)(idx + OTP_BASE);
+#endif
 }
 
 // read chip serial number