IBASE Technology IBR115, Руководство пользователя, Страница: 43 / 48

Appendix
IBR115
User’s Manual
35
E. MicroSD Card Test
When IBR115 is booted from eMMC, micro
SD card is “/dev/mmcblk1” and
able to see by “ls /dev/mmcblk1*” command:
/dev/mmcblk1 /dev/mmcblk1p2 /dev/mmcblk1p4 /dev/mmcblk1p5
/dev/mmcblk1p6
When booting from microSD card, replace te
st pattern “/dev/mmcblk1” to
“/dev/mmcblk0”.
Note: This operation may damage the data stored the microSD card. Before
starting the test, make sure there is no critical data in the eMMC flash
being used.
•
Read, write, and check
SD_DIR="/run/media/mmcblk1"
#create data file
dd if=/dev/urandom of=/var/data1 bs=1024k count=100
#write data to SD card
dd if=/var/data1 of=$ SD_DIR/data2 bs=1024k count=100
#read data2, and compare with data1
cmp $SD_DIR/data2 /var/data1
•
MicroSD card speed test
SD_DIR="/run/media/mmcblk1"
# SD write speed
dd if=/dev/zero of=$SD_DIR/test bs=1M count=1000 oflag=nocache
# SD read speed
dd if=$SD_DIR/test of=/dev/null bs=1M oflag=nocache