uboot update failed on mx6dl board with nand boot

[raymondwang]

I have an mx6dl design board with nand boot. I found an error when trying to dump uboot mtdblock device.

Kernel message dump as below:

<5>[ 1.607132] 7 ofpart partitions found on MTD device gpmi-nand
<5>[ 1.612893] Creating 7 MTD partitions on "gpmi-nand":
<5>[ 1.617988] 0x000000000000-0x000000200000 : "spl"
<5>[ 1.623922] 0x000000200000-0x000000400000 : "bootloader"
<5>[ 1.630348] 0x000000400000-0x000000a00000 : "kernel"
<5>[ 1.636320] 0x000000a00000-0x000040000000 : "rootfs"
<4>[ 1.641304] mtd: partition "rootfs" extends beyond the end of device "gpmi-nand" -- size truncated to 0x1f600000
<5>[ 1.652763] 0x000000400000-0x000001400000 : "android_boot"
<5>[ 1.659251] 0x000001400000-0x000003000000 : "android_recovery"
<5>[ 1.666133] 0x000003000000-0x000040000000 : "android_rootfs"
<4>[ 1.671811] mtd: partition "android_rootfs" extends beyond the end of device "gpmi-nand" -- size truncated to 0x1d000000
<6>[ 1.683958] gpmi-nand 112000.gpmi-nand: driver registered.

When I am trying to dump bootloader, it failed.

busybox hexdump /dev/block/mtdblock1 -n 100
[ 618.929891] blk_update_request: 5 callbacks suppressed
[ 618.935061] end_request: I/O error, dev mtdblock1, sector 0
[ 618.940659] quiet_error: 5 callbacks suppressed
[ 618.945206] Buffer I/O error on device mtdblock1, logical block 0
[ 618.951792] end_request: I/O error, dev mtdblock1, sector 8
[ 618.957382] Buffer I/O error on device mtdblock1, logical block 1
[ 618.963807] end_request: I/O error, dev mtdblock1, sector 16
[ 618.969481] Buffer I/O error on device mtdblock1, logical block 2
[ 618.975796] end_request: I/O error, dev mtdblock1, sector 24
[ 618.981467] Buffer I/O error on device mtdblock1, logical block 3
[ 618.987813] end_request: I/O error, dev mtdblock1, sector 0
[ 618.993396] Buffer I/O error on device mtdblock1, logical block 0
hexdump: /dev/block/mtdblock1: Input/output error

Anybody knows the possible reasons?

[b36401]

Possibly hexdump uses some syscall that NAND driver does not support.
Please try to access the device with some other utility.

Have a great day,
Victor

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[raymondwang]

I don't think so. I can dump other mtd block devices without error in the same nand flash.