On Tue, Oct 14, 2014 at 04:50:27PM +1100, Iwo Mergler wrote:
>
> >
> > No, it doesn't seem to be correct.
> > But it's an MLC flash, so you'll most probably need to apply this patch
> > to nandbiterrs testsuite:
> >
> > http://code.bulix.org/f69wuu-87021
> >
> > This patch is flashing the block between each bitflip insertion to
> > avoid multiple write without erasure (which, AFAIK, is not supported
> > by MLC flashes).
>
> Hi Huang,
>
>
> just out of interest, have you tried this on the MLC NAND without the patch?
>
> I'm aware that MLC says you shouldn't write multiple times, but that is
> with a view towards specified data endurance. I would only expect a few
> additional bit errors during the test.
>
> Did you try the overwrite test?
>
The following is the test result for overwrite with this MLC patch:
root@imx6qdlsolo:~# insmod mtd_nandbiterrs.ko dev=1 mode=1
[ 762.534714]
[ 762.536259] ==================================================
[ 762.542115] mtd_nandbiterrs: MTD device: 1
[ 762.546326] mtd_nandbiterrs: MTD device size 16777216,
eraseblock=2097152, page=8192, oob=744
[ 762.554937] mtd_nandbiterrs: Device uses 1 subpages of 8192
bytes
[ 762.561059] mtd_nandbiterrs: Using page=0, offset=0,
eraseblock=0
[ 762.571333] mtd_nandbiterrs: overwrite biterrors test
[ 762.576715] mtd_nandbiterrs: write_page
[ 762.590448] mtd_nandbiterrs: error: read failed at 0x0
[ 762.595650] mtd_nandbiterrs: Read reported error -74
[ 762.600625] mtd_nandbiterrs: Bit error histogram (0
operations total):
[ 762.608586] mtd_nandbiterrs: finished successfully.
[ 762.613501]
==================================================
insmod: ERROR: could not insert module mtd_nandbiterrs.ko:
Input/output error
thanks
Huang Shijie
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