Tool/software:
I have custom Yocto image on AM6232. I booted from SD card. It booted properly. I want to test emmc for bad block. I used below script to do that.
=========================== START ==============================
#!/bin/sh
EMMC_DEV="/dev/mmcblk0"
BLOCK_SIZE=512
START_BLOCK=0
TMP_FILE="/tmp/pattern.bin"
LOG_FILE="/tmp/emmc_bad_blocks.log"
# Check boot source
BOOT_DEV=$(cat /proc/cmdline | sed -n 's/.*root=\([^ ]*\).*/\1/p')
echo "Boot device: $BOOT_DEV"
if [[ "$BOOT_DEV" == *"mmcblk1"* ]]; then
echo "Booted from SD card ($BOOT_DEV)"
else
echo "Not booted from SD card. Aborting test."
exit 1
fi
# Generate 512-byte test pattern (0x55AA55AA)
echo "Generating test pattern..."
> "$TMP_FILE"
counter=0
while [ $counter -lt $((BLOCK_SIZE / 4)) ]; do
printf '\x55\xAA\x55\xAA' >> "$TMP_FILE"
counter=$((counter + 1))
done
# Get total number of blocks
TOTAL_BLOCKS=$(cat /sys/block/mmcblk0/size)
if [ -z "$TOTAL_BLOCKS" ]; then
echo "Could not determine eMMC size."
exit 1
fi
echo "Starting block-by-block test from block $START_BLOCK to $TOTAL_BLOCKS..."
echo "Logging bad blocks to $LOG_FILE"
> "$LOG_FILE"
FAILED=0
TESTED=0
counter=$START_BLOCK
while [ $counter -lt $TOTAL_BLOCKS ]; do
echo "Testing block $counter / $TOTAL_BLOCKS"
# Write pattern
dd if="$TMP_FILE" of="$EMMC_DEV" bs=$BLOCK_SIZE count=1 seek=$counter 2>/dev/null
sync
# Read and verify
dd if="$EMMC_DEV" bs=$BLOCK_SIZE count=1 skip=$counter 2>/dev/null | cmp - "$TMP_FILE" > /dev/null
if [ $? -ne 0 ]; then
echo "Block counter failed verification" | tee -a "$LOG_FILE"
FAILED=$((FAILED + 1))
fi
TESTED=$((TESTED + 1))
counter=$((counter + 1))
done
echo ""
echo "Test complete."
echo "Total blocks tested: $TESTED"
echo "Total failed blocks: $FAILED"
echo "Bad blocks logged in: $LOG_FILE"
# Cleanup
rm -f "$TMP_FILE"
====================== END ========================
Output of this script as below
**************************** START *******************************
root@etn-cbc9000:~# flash-emmc-test
Generating test pattern...
Starting block-by-block test from block 0 to 62160896...
Logging bad blocks to /tmp/emmc_bad_blocks.log
Testing block 0 / 62160896
Testing block 1 / 62160896
Testing block 2 / 62160896
Block counter failed verification
Testing block 3 / 62160896
Block counter failed verification
Testing block 4 / 62160896
Block counter failed verification
Testing block 5 / 62160896
Block counter failed verification
Testing block 6 / 62160896
Block counter failed verification
Testing block 7 / 62160896
Block counter failed verification
Testing block 8 / 62160896
Testing block 9 / 62160896
Testing block 10 / 62160896
Block counter failed verification
Testing block 11 / 62160896
Block counter failed verification
Testing block 12 / 62160896
Block counter failed verification
Testing block 13 / 62160896
Block counter failed verification
Testing block 14 / 62160896
Block counter failed verification
Testing block 15 / 62160896
Block counter failed verification
Testing block 16 / 62160896
Testing block 17 / 62160896
Testing block 18 / 62160896
Block counter failed verification
Testing block 19 / 62160896
Block counter failed verification
Testing block 20 / 62160896
Block counter failed verification
Testing block 21 / 62160896
Block counter failed verification
Testing block 22 / 62160896
Block counter failed verification
Testing block 23 / 62160896
Block counter failed verification
Testing block 24 / 62160896
Testing block 25 / 62160896
Testing block 26 / 62160896
Block counter failed verification
Testing block 27 / 62160896
Block counter failed verification
**************************** END *******************************
passing block pattern: 1,2,8,9,16,17,24,25,32,33,40,41,48,49 .…..
Another block test failed.
In AM62x-SK board same test passed. I haven't change anything in DTS file for my custom hardware.
Attaching schematic for reference.
