【OpenWrt笔记】MT76x8 reboot命令后系统死机

最新推荐文章于 2023-08-23 20:00:00 发布

原创最新推荐文章于 2023-08-23 20:00:00 发布 · 3.5k 阅读

5 ·

CC 4.0 BY-SA版权

文章标签：

#OpenWrt #mt7688 #mt7628 #mt76x8

OpenWrt笔记专栏收录该内容

2 篇文章

订阅专栏

本文介绍了一种解决开发板在烧写固件后，执行reboot命令时出现卡死现象的方法。通过修改m25p80.c文件中的shutdown函数，确保了开发板在重启过程中的正常运行。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

现象

将固件烧写到系统后，执行reboot命令重启时，开发板卡死，无法进入重启流程。

解决

修改m25p80.c文件

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 8548270..9b186b1 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -259,6 +259,21 @@ static int m25p_remove(struct spi_device *spi)
         return mtd_device_unregister(&flash->spi_nor.mtd);
}

+static void m25p_shutdown(struct spi_device *spi)
+{
+        struct m25p        *flash = spi_get_drvdata(spi);
+
+        if ((&flash->spi_nor)->addr_width > 3) {
+                printk(KERN_INFO "m25p80: exit 4-byte address mode\n");
+                flash->command[0] = SPINOR_OP_EX4B;  // exit 4-byte address mode: 0xe9
+                spi_write(flash->spi, flash->command, 1);
+                flash->command[0] = 0x66;  // enable reset
+                spi_write(flash->spi, flash->command, 1);
+                flash->command[0] = 0x99;  // reset
+                spi_write(flash->spi, flash->command, 1);
+        }
+}
+
/*
  * Do NOT add to this array without reading the following:
  *
@@ -329,6 +344,7 @@ static struct spi_driver m25p80_driver = {
         .id_table        = m25p_ids,
         .probe        = m25p_probe,
         .remove        = m25p_remove,
+        .shutdown = m25p_shutdown,

         /* REVISIT: many of these chips have deep power-down modes, which
          * should clearly be entered on suspend() to minimize power use.