Re: [EXT] Re: [RESEND PATCH V2 2/2] mtd: core: NAND filling block

[Boris Brezillon <bbrezillon@xxxxxxxxxx>]

On Mon, 21 Jan 2019 10:04:15 +0000
"Bean Huo (beanhuo)" <beanhuo@xxxxxxxxxx> wrote:

> Hi, Boris
> 
> >On Fri, 18 Jan 2019 22:12:04 +0000
> >"Bean Huo (beanhuo)" <beanhuo@xxxxxxxxxx> wrote:
> >  
> >> +	/* Corrupt page0 and page1, in order to simulate an
> >> +	 * uncompleted eraseing scenario. Just for case of
> >> +	 * power loss hits while below programming. in this
> >> +	 * way, the PEB will be re-erased again.
> >> +	 */
> >> +	empty_page_mask |= 0x3;
> >> +	memset(data_buf, 0xAA,  mtd->writesize);  
> >
> >Why do you use the 0xaa pattern BTW?  
> 
> Random pattern or any pattern is ok. Just to fill in page.

Let's use 0x0 then. This way all cells are actually in a "programmed"
state. BTW, I'd still be interested in knowing more about the root
cause of this issue. What causes this wrong "cell is erased" detection
in your chips? I thought the ERASE operation was an iterative process
and cells were being tested after each step to know whether they are
erased or not in order to decide to do another step or stop.
Am I wrong? What happens here to cause this erroneous detection?

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