arch: Add warning for unset reboot reason before system reset

Reboot reason is one of the most critical pieces of information for
diagnosing why a system rebooted. Without it, post-mortem debugging
becomes extremely difficult.

So, add validation check for reboot reason before reset and display
warning message if reboot reason is not set

And, add missing sched_unlock(). it is needed when board_reset is failed.

Signed-off-by: eunwoo.nam <eunwoo.nam@samsung.com>

Author: ewoodev

os/arch/boardctl.c

@@ -152,9 +152,18 @@ int boardctl(unsigned int cmd, uintptr_t arg)
 		/* Add 100ms delay for flushing another logs like printf. */
 		up_mdelay(100);
 		lldbg("Board will Reboot now. pid: %d\n", getpid());
+#ifdef CONFIG_SYSTEM_REBOOT_REASON
+		if (!up_reboot_reason_is_written()) {
+			for (int i = 0; i < 10; i++) {
+				lldbg("\n    VIOLATION!!! YOU MUST SET REBOOT REASON!!!\n\n");
+			}
+		}
+#endif
 		/* Add 100ms delay for flushing UART FIFO. */
 		up_mdelay(100);
 		ret = board_reset((int)arg);
+
+		sched_unlock();
 		break;
 #endif