由於系統使用的是ubi檔案系統。所以在對檔案系統進行寫操作後，如果要斷電、復位、重啟等，請先執行sync，否則有可能寫入的資料丟失。
1．tf卡：
接上tf卡 ，系統會類似的列印以下資訊：
# mmc0: host does not support reading read-only switch, assuming write-enable
mmc0: new high speed sdhc card at address 0001
mmcblk0: mmc0:0001 sd8gb 7.27 gib
mmcblk0: p1 p2 #生成2個節點mmcblk0p1 mmcblk0p2
以下是筆者使用tf啟動卡進行測試的過程：
#
# mmc0: host does not support reading read-only switch, assuming write-enable
mmc0: new high speed sdhc card at address 0001
mmcblk0: mmc0:0001
sd8gb
7.27
gib
mmcblk0: p1 p2
ext3-fs (mmcblk0p2): error: couldn't mount because of unsupported optional features (240)
fat-fs (mmcblk0p1): volume was not properly unmounted. some
data may be corrupt. please run fsck.
ext2-fs (mmcblk0p2): error: couldn't mount because of unsupported optional features (244)
ext4-fs (mmcblk0p2): recovery complete
ext4-fs (mmcblk0p2): mounted filesystem with ordered data mode. opts: (null)
# mount
ubi0:rootfs on / type ubifs (rw,relatime)
devtmpfs on /dev type devtmpfs (rw,relatime,size=89476k,nr_inodes=22369,mode=755)
proc on /proc
type proc (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,relatime,mode=777)
tmpfs on /tmp type tmpfs (rw,relatime)
tmpfs on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
sysfs on /sys type sysfs (rw,relatime)
/dev/mmcblk0p2 on /run/media/mmcblk0p2 type ext4 (rw,relatime,data=ordered)
/dev/mmcblk0p1 on /run/media/mmcblk0p1 type vfat (rw,relatime,gid=6,fmask=0007,dmask=0007,allow_utime=0020,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
# # ls /run/media/mmcblk0p1
imx6ul-14x14-evk.dtb zimage
# echo 1234 > /run/media/mmcblk0p1/tmp.txt
# cat /run/media/mmcblk0p1/tmp.txt
1234
# sync
# mmc0: card 0001 removed
#
測試u盤的方法和sd卡的方法一樣，只不過命令列中的 mmcblk1p1換成sda1 。
# usb 1-1.4: new high-speed usb device number 4 using ci_hdrc
usb-storage 1-1.4:1.0: usb
mass
storage device detected
scsi host1: usb-storage 1-1.4:1.0
scsi
1:0:0:0: direct-access
sandisk
ultra
1.00
pq: 0
ansi: 6
sd1:0:0:0: [sda] 60062500
512-byte logical blocks: (30.7
gb/28.6
gib)
sd1:0:0:0: [sda] write
protect is off
sd1:0:0:0: [sda] write cache: disabled, read cache: enabled, doesn't support dpo or fua
sda: sda1
sd1:0:0:0: [sda] attached
scsi removable disk
fat-fs (sda1): volume was not properly unmounted. some
data may be corrupt. please run fsck.
# mount
ubi0:rootfs on / type ubifs (rw,relatime)
devtmpfs on /dev type devtmpfs (rw,relatime,size=89476k,nr_inodes=22369,mode=755)
proc on /proc
type proc (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,relatime,mode=777)
tmpfs on /tmp type tmpfs (rw,relatime)
tmpfs on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
sysfs on /sys type sysfs (rw,relatime)
/dev/sda1 on /run/media/sda1 type fuseblk (rw,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
# ls /run/media/sda1
1g_file sandisksecureaccess
# usb 1-1.4: usb disconnect, device number 4
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