实现读取nand的id，正在编写坏块管理算法

source/rt_thread/libcpu/arm/arm926/machine.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-02-08     RT-Thread    the first version
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+RT_WEAK void machine_reset(void)
+{
+    rt_kprintf("reboot system...\n");
+    rt_hw_interrupt_disable();
+    while (1);
+}
+
+RT_WEAK void machine_shutdown(void)
+{
+    rt_kprintf("shutdown...\n");
+    rt_hw_interrupt_disable();
+    while (1);
+}
+