RE: nandtest error

Jeff Lauruhn (jlauruhn)
2015-04-29T21:12:41Z

When you read the data back are you reading the raw data? Some amount of bit flipping is normal NAND Flash behavior. ECC correction is required on all contemporary NAND to some degree to correct bit flips. This Micron device is designed to return a "FAIL" status only when the number of bad bits in any page exceeds 40bits/1117 bytes.

I need to understand what nandtest is actually doing. If I read this right, if found 32 flipped bits in a 32 gigabit device. That's actually very good.

Jeff Lauruhn
NAND Application Engineer
Embedded Business Unit
Micron Technology, Inc

-----Original Message-----
From: linux-mtd [mailto:linux-mtd-bounces@lists.infradead.org] On Behalf Of Han Xu
Sent: Wednesday, April 29, 2015 11:36 AM
To: Tee Zhen Cong
Cc: linux-mtd@lists.infradead.org
Subject: Re: nandtest error

On Wed, Apr 29, 2015 at 4:48 AM, Tee Zhen Cong <zc.tee@teraoka.com.sg> wrote: