LTT-MX8M-EVM100 开发板 linux 4.14.98使用手册

阅读指导

蓝色字体为调试终端的信息，其中 “ # ” 或“ > ”开头的为用户输入的指令。

# cd ~/work
> boot

SD卡测试

系统启动后将SD卡插入到Micro SD卡槽【J26】中，系统会自动将其挂载到/run/media目录下，在插入SD卡的同时，在系统终端会打印出SD卡相关信息：

[  418.785224] mmc1: host does not support reading read-only switch, assuming write-enable
[  418.931992] mmc1: new ultra high speed SDR104 SDHC card at address 0007
[  418.940000] mmcblk1: mmc1:0007 SD32G 29.0 GiB 
[  418.947404]  mmcblk1: p1
[  419.146762] FAT-fs (mmcblk1p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.

可通过df命令查看SD卡挂载位置:

df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root       2.3G  1.9G  235M  89% /
devtmpfs        237M  4.0K  237M   1% /dev
tmpfs           494M     0  494M   0% /dev/shm
tmpfs           494M  8.5M  485M   2% /run
tmpfs           494M     0  494M   0% /sys/fs/cgroup
tmpfs           494M     0  494M   0% /tmp
tmpfs           494M  156K  493M   1% /var/volatile
/dev/mmcblk0p1   64M   41M   24M  64% /run/media/mmcblk0p1
tmpfs            99M     0   99M   0% /run/user/0
/dev/mmcblk1p1   29G  2.3G   27G   8% /run/media/mmcblk1p1

可通过如下命令查看、读写当前SD卡的内容：

# ls /run/media/mmcblk2p1/     #查看SD卡的内容
# cd /run/media/mmcblk2p1/     #进入SD卡目录
# touch test                   #创建test文件
# rm test                      #删除test文件

USB HOST 测试

以U盘为例，将U盘插入USB HOST接口【J20、J21、J22、J23】其中任意一个，系统会默认将U盘挂载在/run/media目录下，并打印如下消息：

[  766.582245] usb 1-1.4: new high-speed USB device number 7 using xhci-hcd
[  766.700039] usb-storage 1-1.4:1.0: USB Mass Storage device detected
[  766.711958] scsi host0: usb-storage 1-1.4:1.0
[  767.744766] scsi 0:0:0:0: Direct-Access     Generic  Flash Disk       8.07 PQ: 0 ANSI: 4
[  767.755868] sd 0:0:0:0: [sda] 15728640 512-byte logical blocks: (8.05 GB/7.50 GiB)
[  767.764424] sd 0:0:0:0: [sda] Write Protect is off
[  767.770329] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[  767.785294]  sda: sda1
[  767.791353] sd 0:0:0:0: [sda] Attached SCSI removable disk
[  768.254786] FAT-fs (sda1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.

可通过df命令查看U盘挂载位置：

df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root       2.3G  1.9G  235M  89% /
devtmpfs        237M  4.0K  237M   1% /dev
tmpfs           494M     0  494M   0% /dev/shm
tmpfs           494M  8.5M  485M   2% /run
tmpfs           494M     0  494M   0% /sys/fs/cgroup
tmpfs           494M     0  494M   0% /tmp
tmpfs           494M  168K  493M   1% /var/volatile
/dev/mmcblk0p1   64M   41M   24M  64% /run/media/mmcblk0p1
tmpfs            99M     0   99M   0% /run/user/0
/dev/sda1       7.5G  1.7G  5.9G  22% /run/media/sda1

通过如下命令查看、读写U盘内容：

 # ls /run/media/sda1/        #查看U盘的内容
 # cd /run/media/sda1/        #进入U盘目录
 # touch test                 #创建test文件
 # rm test                    #删除test文件