Updater: Write functional ram code loader

Updater RAM Code
----------------
* Ack running watchdog every 250 ms
* Blink green LED every 250 ms

Firmware
--------
* Add RAM code loader
* Reorganize initialization
* Add update command to shell

stm-firmware/main.c

@@ -43,6 +43,9 @@
 #include <reflow-controller/ui/gui.h>
 #include <reflow-controller/safety/safety-controller.h>
 #include <reflow-controller/settings/settings.h>
+#include <reflow-controller/safety/safety-memory.h>
+#include <reflow-controller/safety/fault.h>
+#include <reflow-controller/updater/updater.h>
 
 static void setup_nvic_priorities(void)
 {
@@ -142,9 +145,32 @@ static bool mount_sd_card_if_avail(bool mounted)
 	return mounted;
 }
 
+static inline void handle_boot_status(void)
+{
+	struct safety_memory_boot_status status;
+	int res;
+
+	res = safety_memory_get_boot_status(&status);
+	if (res != 0)
+		panic_mode();
+	if (status.reboot_to_bootloader) {
+		status.reboot_to_bootloader = 0UL;
+		safety_memory_set_boot_status(&status);
+
+		led_set(0, 1);
+		led_set(1, 1);
+
+		start_updater();
+	}
+}
+
 static inline void setup_system(void)
 {
 	setup_nvic_priorities();
+
+	/* Init safety controller and safety memory */
+	safety_controller_init();
+
 	systick_setup();
 	oven_driver_init();
 	digio_setup_default_all();
@@ -152,8 +178,10 @@ static inline void setup_system(void)
 	loudspeaker_setup();
 	gui_init();
 	uart_gpio_config();
+
+	handle_boot_status();
+
 	setup_shell_uart(&shell_uart);
-	safety_controller_init();
 	adc_pt1000_setup_meas();
 }