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Step 3: Write and check
#echo
-n
"0123456789ABCDEF"
seek=25118
0+1 records in
0+1 records out
#hexdump -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|
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.
3.1.4
SD Test
Step 1: When booting from eMMC, you would see only below directories:
#ls /dev/mmcblk*
/dev/mmcblk0
Step 2: Insert SD card to SD card slot and check your device again. You should be
able to see more directories. /dev/mmcblk1 is the SD card storage.
#ls /dev/mmcblk*
/dev/mmcblk0
/dev/mmcblk0boot0
Step 3: Erase and check
#dd if=/dev/zero of=/dev/mmcblk1 bs=1024 count=1 seek=25118
1+0 records in
1+0 records out
#hexdump -C /dev/mmcblk0 -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
0+1 records in
0+1 records out
#hexdump -C /dev/mmcblk0 -s 25720832 -n 16
01887800 30 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46 |0123456789ABCDEF|
|
/dev/mmcblk0boot0
/dev/mmcblk0boot1
/dev/mmcblk0p1
11
dd
of=/dev/sdb
/dev/mmcblk0boot1
/dev/mmcblk1
/dev/mmcblk1p1
ROM-5420 User Manual
bs=1024
count=1
/dev/mmcblk0p1
/dev/mmcblk1p2
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