Advantech ROM-3420CD-MDA1E, Руководство пользователя

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11 ROM-3420 User Manual
Chapter 3
S
oftware
Functionality
1+0 records in
1+0 records out
#hexdump
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C /dev/sdb
‐
s 25720832
‐
n 16
01887800 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
Step 3: Write and check
#echo
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n "0123456789ABCDEF" | dd of=/dev/sdb bs=1024 count=1 seek=25118
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#hexdump
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C /dev/sdb
‐
s 25720832
‐
n 16
01887800 30 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46 |0123456789ABCDEF|
3.1.4 SD Test
Step 1: When booting from eMMC, you would see only below directories:
#ls /dev/mmcblk*
/dev/mmcblk0 /dev/mmcblk0boot0 /dev/mmcblk0boot1 /dev/mmcblk0p1
Step 2: Insert SD card to SD card slot and check your device again. You should be
able to see more devices. /dev/mmcblk1 is the SD card storage.
#ls /dev/mmcblk*
/dev/mmcblk0 /dev/mmcblk0boot1 /dev/mmcblk1 /dev/mmcblk1p2
/dev/mmcblk0boot0 /dev/mmcblk0p1 /dev/mmcblk1p1
Step 3: Erase and check
#dd if=/dev/zero of=/dev/mmcblk1 bs=1024 count=1 seek=25118
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#hexdump
‐
C /dev/mmcblk1
‐
s 25720832
‐
n 16
01887800 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
Step 4: Write and check
#echo
‐
n "0123456789ABCDEF" | dd of=/dev/mmcblk1 bs=1024 count=1 seek=25118
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0+1 records out
Note! This operation may damage the data stored in USB flash disk. Please
make sure there is no critical data in the USB flash disk being used for
this test.