linux-kernel - RE: [EXT] Re: [PATCH v7 0/6] Add new series Micron SPI NAND devices

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Date:   Fri, 15 May 2020 09:59:07 +0000
From:   "Shivamurthy Shastri (sshivamurthy)" <sshivamurthy@...ron.com>
To:     Poonam Aggrwal <poonam.aggrwal@....com>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
CC:     Miquel Raynal <miquel.raynal@...tlin.com>,
        "shiva.linuxworks@...il.com" <shiva.linuxworks@...il.com>,
        Ashish Kumar <ashish.kumar@....com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Chuanhong Guo <gch981213@...il.com>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        Suram Suram <suram@....com>,
        "lkft-triage@...ts.linaro.org" <lkft-triage@...ts.linaro.org>
Subject: RE: [EXT] Re: [PATCH v7 0/6] Add new series Micron SPI NAND devices

Hi Naresh and Poonam,

> Subject: [EXT] Re: [PATCH v7 0/6] Add new series Micron SPI NAND devices
> 
> Hi Poonam,
> 
> Poonam Aggrwal <poonam.aggrwal@....com> wrote on Fri, 15 May 2020
> 05:29:07 +0000:
> 
> > Adding Ashish.
> >
> > Regards
> > Poonam
> >
> > > -----Original Message-----
> > > From: Naresh Kamboju <naresh.kamboju@...aro.org>
> > > Sent: Friday, May 15, 2020 10:57 AM
> > > To: shiva.linuxworks@...il.com; Miquel Raynal
> <miquel.raynal@...tlin.com>;
> > > Shivamurthy Shastri <sshivamurthy@...ron.com>
> > > Cc: Richard Weinberger <richard@....at>; Vignesh Raghavendra
> > > <vigneshr@...com>; Boris Brezillon <boris.brezillon@...labora.com>;
> > > Chuanhong Guo <gch981213@...il.com>; Frieder Schrempf
> > > <frieder.schrempf@...tron.de>; linux-mtd@...ts.infradead.org; open
> list <linux-
> > > kernel@...r.kernel.org>; Poonam Aggrwal
> <poonam.aggrwal@....com>;
> > > Suram Suram <suram@....com>; lkft-triage@...ts.linaro.org
> > > Subject: Re: [PATCH v7 0/6] Add new series Micron SPI NAND devices
> > >
> > > On Wed, 11 Mar 2020 at 23:28, <shiva.linuxworks@...il.com> wrote:
> > > >
> > > > From: Shivamurthy Shastri <sshivamurthy@...ron.com>
> > > >
> > > > This patchset is for the new series of Micron SPI NAND devices, and
> > > > the following links are their datasheets.
> > >
> > > While boot NXP ls2088 device with mainline kernel the following nand
> warning
> > > noticed. How critical this warning ?
> 
> Are you sure this is the right thread? Shivamurthy added SPI-NAND
> support, you are talking about a raw NAND device.
> > >
> > > [    1.357722] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x48
> > > [    1.364085] nand: Micron MT29F16G08ABACAWP
> > > [    1.368181] nand: 2048 MiB, SLC, erase size: 512 KiB, page size:
> > > 4096, OOB size: 224
> > > [    1.375932] nand: WARNING: 530000000.flash: the ECC used on your
> > > system is too weak compared to the one required by the NAND chip
> 
> If you are talking about this one, it is pretty self explanatory: the
> NAND chip requires a minimum correction which is not achieved here.
> Either because the ECC engine cannot reach the requested amount (you
> cannot do anything) or because you requested a too low correction with
> DT properties.
> 

Minimum required ECC for this device is 8-bit. Below is the datasheet for your reference.

https://www.micron.com/-/media/client/global/documents/products/data-sheet/nand-flash/70-series/m72a_production_datasheet_revg.pdf?rev=bb0a4ba04a1f40f98e29dc624d178dd8


> > >
> > > [    1.388767] Bad block table found at page 524160, version 0x01
> > > [    1.396833] Bad block table found at page 524032, version 0x01
> > > [    1.403781] nand_read_bbt: bad block at 0x000002d00000
> > > [    1.408921] nand_read_bbt: bad block at 0x000002d80000
> > > [    1.414750] fsl,ifc-nand 530000000.nand: IFC NAND device at
> > > 0x530000000, bank 2
> > >
> > >
> > > Full test log,
> > >
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fqa-
> > > reports.linaro.org%2Flkft%2Flinux-mainline-oe%2Fbuild%2Fv5.7-rc5-55-
> > >
> g1ae7efb38854%2Ftestrun%2F18254%2Flog&amp;data=02%7C01%7Cpoona
> m.
> > >
> aggrwal%40nxp.com%7C146f634c869f4c70baa108d7f8909ffb%7C686ea1d3bc
> 2
> > >
> b4c6fa92cd99c5c301635%7C0%7C0%7C637251172354638298&amp;sdata=%2B
> > >
> Jhs%2Fb92%2BA56WzYdHe%2BBhXWfjk8feCGAFv%2BRzFKC9PM%3D&amp;r
> ese
> > > rved=0
> > >
> > > - Naresh
> 
> Thanks,
> Miquèl

Thanks,
Shiva