Add "Reset to OpenBLT" button (#4364)

Similar to "Reset to DFU", but uses different seed

firmware/Makefile

@@ -213,6 +213,7 @@ endif
 ifeq ($(USE_OPENBLT),yes)
   # Reserve start of flash for OpenBLT
   USE_OPT += -Wl,--defsym=BOOTLOADER=1
+  DDEFS += -DEFI_USE_OPENBLT=TRUE
 endif
 
 $(info PROJECT_BOARD: $(PROJECT_BOARD))

firmware/controllers/bench_test.cpp

@@ -529,6 +529,14 @@ void executeTSCommand(uint16_t subsystem, uint16_t index) {
 		rebootNow();
 #endif /* EFI_PROD_CODE */
 		break;
+
+#if EFI_USE_OPENBLT
+	case 0xbc:
+		/* Jump to OpenBLT if present */
+		jump_to_openblt();
+		break;
+#endif
+
 	default:
 		firmwareError(OBD_PCM_Processor_Fault, "Unexpected bench subsystem %d %d", subsystem, index);
 	}

firmware/hw_layer/ports/mpu_util.h

@@ -9,6 +9,9 @@
 // Base MCU
 void baseMCUInit(void);
 void jump_to_bootloader();
+#if EFI_USE_OPENBLT
+void jump_to_openblt();
+#endif
 bool allowFlashWhileRunning();
 
 bool ramReadProbe(volatile const char *read_address);

firmware/hw_layer/ports/stm32/stm32_common.cpp

@@ -326,7 +326,7 @@ stm32_hardware_pwm* getNextPwmDevice() {
 }
 #endif
 
-void jump_to_bootloader() {
+static void reset_and_jump(uint32_t breadcrumb) {
 	#ifdef STM32H7XX
 		// H7 needs a forcible reset of the USB peripheral(s) in order for the bootloader to work properly.
 		// If you don't do this, the bootloader will execute, but USB doesn't work (nobody knows why)
@@ -334,11 +334,19 @@ void jump_to_bootloader() {
 		RCC->AHB1ENR &= ~(RCC_AHB1ENR_USB1OTGHSEN | RCC_AHB1ENR_USB2OTGFSEN);
 	#endif
 
-	// leave DFU breadcrumb which assembly startup code would check, see [rusefi][DFU] section in assembly code
-	*((unsigned long *)0x2001FFF0) = 0xDEADBEEF; // End of RAM
+	*((unsigned long *)0x2001FFF0) = breadcrumb; // End of RAM
 	// and now reboot
 	NVIC_SystemReset();
 }
+
+void jump_to_bootloader() {
+	// leave DFU breadcrumb which assembly startup code would check, see [rusefi][DFU] section in assembly code
+	reset_and_jump(0xDEADBEEF);
+}
+
+void jump_to_openblt() {
+	reset_and_jump(0xCAFEBABE);
+}
 #endif /* EFI_PROD_CODE */
 
 #if EFI_AUX_SERIAL

firmware/tunerstudio/rusefi.input

@@ -1778,6 +1778,8 @@ cmd_stop_engine              = "@@TS_IO_TEST_COMMAND_char@@\x00\x79\x00\x00"
 cmd_reset_controller         = "@@TS_IO_TEST_COMMAND_char@@\x00\xbb\x00\x00"
 ; jump to DFU mode
 cmd_dfu         			 = "@@TS_IO_TEST_COMMAND_char@@\x00\xba\x00\x00"
+; jump to OpenBLT bootloader
+cmd_openblt              = "@@TS_IO_TEST_COMMAND_char@@\x00\xbc\x00\x00"
 
 ; See 'executeTSCommand' in firmware source code
 
@@ -3696,6 +3698,7 @@ dialog = tcuControls, "Transmission Settings"
 		commandButton = "Write Config", cmd_write_config          
 		commandButton = "Reset ECU", cmd_reset_controller
 		commandButton = "Reset to DFU", cmd_dfu
+		commandButton = "Reset to OpenBLT", cmd_openblt
 		commandButton = "F7 nDBANK fix", cmd_nDBANK@@if_ts_show_f7_presets
 		commandButton = "No flash Burn mode", cmd_burn_without_flash