20160925版本重新改回tf卡根文暂时解决spi flash错误ERROR: xfer_data_dma

发布于 2016-09-26 21:05:38 浏览：2082 订阅该版

RT
在这个版本下，用wget下载 rtthread 到tf卡,经常出错~~~
```
ERROR: xfer_data_dma, transfer timeout transfer_completion->flag =0x0
fh_spi_xfer dma transfer error no:fffffffe
```

暂时改回TF卡做根文件系统，/spiroot  用于挂载spi的flash rootfs分区,但是尽量不要操作spiroot  ，出现死机概率灰常高。。

于是暂时解决：
打开 firmware-20160925platformfh8620iot_camoard.c
找到586行，

![1.jpg](/uploads/6438_ba2e8949516c581e81b019bfd83150e3.jpg)

添加代码：

```
#if 1
//add by chow dfs_unmount
//重新挂载SD卡为根文件系统//测试 SPI根文件新系统不稳定现象
        rt_kprintf("dfs_unmount");
        if (dfs_unmount("/sdcard") == 0)
        {
            rt_kprintf("sdcard file system unmount!
");
        }
        else
            rt_kprintf("sdcard file system unmount failed!
");

if (dfs_unmount("/") == 0)
        {
            rt_kprintf("/ file system unmount!
");
        }
        else
            rt_kprintf("/ file system unmount failed!
");

////////////////////////////////////////////////////////
        if (dfs_mount("sd0", "/", "elm", 0, 0) == 0)
        {
            rt_kprintf("remount rootfs sdcard file system initialized!
");
        }
        else
            rt_kprintf("remount sdcard file system initialization failed!
");
        if (dfs_mount("rootfs", "/spiroot", "elm", 0, 0) == 0)
        {
            rt_kprintf("remount spiroot file system initialized!
");
        }
#endif```