Re: ubi0 warning: 0xc02d6658: error -74 (ECC error) while reading 64 bytes from PEB

[Miquel Raynal <miquel.raynal@bootlin.com>]

Hi Pieter,

Please always add Boris in cc please.

On Tue, 22 May 2018 07:19:54 +0000, Cardoen Pieter
<P.Cardoen@TELEVIC.com> wrote:

> Dear
> 
> 
> Can someone advice me with this question. It is blocking me and I don't know how to debug this.  
> 
> 
> I am currently trying to use the mainline kernel on a custom imx6ul board with an SLC NAND flash device (29F4G08ABADAH4). When the rootfs is mounted, I get continuously ECC errors (see log below).
> 
> I am however sure that the rootfs is programmed. The device boots with an older kernel version on the same device.
> 
> I also noticed that with my previous kernel version, it used mtd->_read in function mtd_read while now it is using mtd->_read_oob.
> 
>  When the gpmi driver is loaded, the device gets scanned for bad blocks. In that case nand_read_oob is executed and this results in a call to nand_do_read_oob:
>  
>     if (!ops->datbuf)
>         ret = nand_do_read_oob(mtd, from, ops);
>     else
>         ret = nand_do_read_ops(mtd, from, ops);
> 
> Can someone assist me how to debug this issue?

As requested in a previous thread by Boris, can you please share the
exact version of each kernel you used there? What version work, what
version does not.

Thanks,
Miquèl