I-Tech AO-IBR117, Руководство пользователя

Страница: 43 / 52

Appendix
AO-IBR117
User’s Manual
35
E. SD Card Test
When
AO-IBR117
is booted from eMMC
, 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
AO-
IBR117 is booted
from SD card, replace test pattern “/dev/
mmcblk1” to “/dev/mmcblk0”.
Note: This operation may damage the data stored the SD 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 $SD_DIR/data2 /var/data1
•
SD card speed test
SD_DIR="/run/media/mmcblk1"
# SD write speed
dd if=/dev/zero of=$SD_DIR/test bs=1M count=1000 oflag=nocache
# SD read speed
dd if=$SD_DIR/test of=/dev/null bs=1M oflag=nocache