天嵌i.MX6UL开发平台存储设备的测试方法

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  天嵌科技工业级i.MX6UL_B版配有4路Usb Host (2路双层USB接口，USB2/USB4与扩展接口/4PIN排针复用，可通过电阻选择，默认使用双层USB接口)和1路Usb OTG；由于系统使用的是ubi文件系统。所以在对文件系统进行写操作后，如果要断电、复位、重启等，请先执行sync，否则有可能写入的数据丢失。

1、tf卡

接上tf卡，系统会类似的打印以下信息：

1. <font color="#000000"># mmc0: host does not support reading read-only switch, assuming write-enable
   
2. mmc0: new high speed SDHC card at address 0001
   
3. mmcblk0: mmc0:0001 SD8GB 7.27 GiB
   
4. mmcblk0: p1 p2 #生成2个节点mmcblk0p1 mmcblk0p2</font>

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      可以通过mount 查看卡的挂载目录。可以像正常文件系统一样操作卡内的文件。另外，在修改数据过后，拔出卡时请先执行sync，否则会有低概率等造成数据修改失败。以下是笔者使用tf 启动卡进行测试的过程：

1. #
   
2. # mmc0: host does not support reading read-only switch, assuming write-enable
   
3. mmc0: new high speed SDHC card at address 0001
   
4. mmcblk0: mmc0:0001 SD8GB 7.27 GiB
   
5. mmcblk0: p1 p2
   
6. EXT3-fs (mmcblk0p2): error: couldn't mount because of unsupported optional features (240)
   
7. FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
   
8. EXT2-fs (mmcblk0p2): error: couldn't mount because of unsupported optional features (244)
   
9. EXT4-fs (mmcblk0p2): recovery complete
   
10. EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
    
11. 
    
12. # mount
    
13. ubi0:rootfs on / type ubifs (rw,relatime)
    
14. devtmpfs on /dev type devtmpfs (rw,relatime,size=89476k,nr_inodes=22369,mode=755)
    
15. proc on /proc type proc (rw,relatime)
    
16. devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620)
    
17. tmpfs on /dev/shm type tmpfs (rw,relatime,mode=777)
    
18. tmpfs on /tmp type tmpfs (rw,relatime)
    
19. tmpfs on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
    
20. sysfs on /sys type sysfs (rw,relatime)
    
21. /dev/mmcblk0p2 on /run/media/mmcblk0p2 type ext4 (rw,relatime,data=ordered)
    
22. /dev/mmcblk0p1 on /run/media/mmcblk0p1 type vfat
    
23. (rw,relatime,gid=6,fmask=0007,dmask=0007,allow_utime=0020,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
    
24. #
    
25. # ls /run/media/mmcblk0p1
    
26. imx6ul-14x14-evk.dtb zImage
    
27. # echo 1234 > /run/media/mmcblk0p1/tmp.txt
    
28. # cat /run/media/mmcblk0p1/tmp.txt
    
29. 1234
    
30. # sync
    
31. # mmc0: card 0001 removed
    
32. #

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2、U盘

   测试U 盘的方法和SD 卡的方法一样，只不过命令行中的mmcblk1p1 换成sda1 。

1. # usb 1-1.4: new high-speed USB device number 4 using ci_hdrc
   
2. usb-storage 1-1.4:1.0: USB Mass Storage device detected
   
3. scsi host1: usb-storage 1-1.4:1.0
   
4. scsi 1:0:0:0: Direct-Access SanDisk Ultra 1.00 PQ: 0 ANSI: 6
   
5. sd 1:0:0:0: [sda] 60062500 512-byte logical blocks: (30.7 GB/28.6 GiB)
   
6. sd 1:0:0:0: [sda] Write Protect is off
   
7. sd 1:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
   
8. sda: sda1
   
9. sd 1:0:0:0: [sda] Attached SCSI removable disk
   
10. FAT-fs (sda1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
    
11. # mount
    
12. ubi0:rootfs on / type ubifs (rw,relatime)
    
13. devtmpfs on /dev type devtmpfs (rw,relatime,size=89476k,nr_inodes=22369,mode=755)
    
14. proc on /proc type proc (rw,relatime)
    
15. devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620)
    
16. tmpfs on /dev/shm type tmpfs (rw,relatime,mode=777)
    
17. tmpfs on /tmp type tmpfs (rw,relatime)
    
18. tmpfs on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
    
19. sysfs on /sys type sysfs (rw,relatime)
    
20. /dev/sda1 on /run/media/sda1 type fuseblk
    
21. (rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
    
22. # ls /run/media/sda1
    
23. 1G_file SanDiskSecureAccess
    
24. # usb 1-1.4: USB disconnect, device number 4

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      天嵌工控板i.MX6UL_B版，拥有丰富的Usb接口，可满足客户产品各种要求。上文介绍的测试方法您掌握了没有？如有不明白之处请联系天嵌科技技术支持：

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