From: "Lothar Waßmann" <LW@KARO-electronics.de>
To: Huang Shijie <b32955@freescale.com>
Cc: Fabio Estevam <fabio.estevam@freescale.com>,
Mark Rutland <mark.rutland@arm.com>,
Shawn Guo <shawn.guo@linaro.org>,
Russell King <linux@arm.linux.org.uk>,
Pawel Moll <pawel.moll@arm.com>, Arnd Bergmann <arnd@arndb.de>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Artem Bityutskiy <artem.bityutskiy@linux.intel.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
linux-mtd@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
Rob Landley <rob@landley.net>, Kumar Gala <galak@codeaurora.org>,
Brian Norris <computersforpeace@gmail.com>,
David Woodhouse <dwmw2@infradead.org>,
Sascha Hauer <kernel@pengutronix.de>,
Shawn Guo <shawn.guo@freescale.com>
Subject: Re: [PATCHv2 1/1] mtd: gpmi: make blockmark swapping optional
Date: Wed, 26 Mar 2014 12:55:02 +0100 [thread overview]
Message-ID: <20140326125502.0e8d0657@ipc1.ka-ro> (raw)
In-Reply-To: <5332AEE7.2040402@freescale.com>
Hi,
Huang Shijie wrote:
> 于 2014年03月26日 16:51, Lothar Waßmann 写道:
> > I don't see why this should not be supported on i.MX28 (i.MX23 doesn't
> > do byteswapping anyway, so this wouldn't change anything for i.MX23).
> > The partitions used by Linux need not necessarily be accessible for the
> > Boot ROM code (and vice versa).
> But the first partition used to store the u-boot is accessible for the ROM.
>
Whether this partition is available to Linux depends on the partition table
passed in the DT.
> Please see "Figure 12-13" in the 12.12.1.12:
> "In order to preserve the BI (bad block information), flash updater
> or gang programmer
> applications need to swap Bad Block Information (BI) data to byte 0 of
> metadata area for
> every page before programming NAND Flash. ROM when loading firmware,
> copies back
> the value at metadata[0] to BI offset in page data. The following figure
> shows how the
> factory bad block marker is preserved."
>
The inspection of the BB markers is only a fallback for the case that
there is no DBBT. From the same chapter that you quoted above:
| ROM uses DBBT to skip any bad block that falls within firmware data
| on NAND Flash device.
| If the address of DBBT Search Area in FCB is 0, ROM will rely on
| factory marked bad block markers to find out if a block is good or bad.
Thus, even the boot ROM of i.MX28 can well live without blockmark
swapping.
Lothar Waßmann
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next prev parent reply other threads:[~2014-03-26 11:55 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1395235406-13449-1-git-send-email-y>
2014-03-20 8:33 ` [PATCH] mtd: gpmi: make blockmark swapping optional Juergen Beisert
2014-03-20 9:20 ` Lothar Waßmann
2014-03-20 9:15 ` Huang Shijie
2014-03-20 9:21 ` Lothar Waßmann
2014-03-20 9:47 ` Huang Shijie
2014-03-20 10:09 ` Lothar Waßmann
2014-03-20 10:56 ` Huang Shijie
2014-03-21 5:36 ` Huang Shijie
[not found] ` <532BCFCC.4080205-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
2014-03-21 10:50 ` [PATCHv2 1/1] " Lothar Waßmann
2014-03-24 9:59 ` Huang Shijie
2014-03-26 8:51 ` Lothar Waßmann
2014-03-26 10:41 ` Huang Shijie
2014-03-26 11:55 ` Lothar Waßmann [this message]
2014-03-27 9:59 ` Huang Shijie
2014-03-27 12:21 ` Lothar Waßmann
2014-03-28 2:09 ` Huang Shijie
2014-03-28 8:16 ` Lothar Waßmann
2014-03-28 8:39 ` Huang Shijie
2014-03-28 9:00 ` Sascha Hauer
2014-03-28 9:26 ` Huang Shijie
2014-03-28 9:31 ` Lothar Waßmann
2014-03-28 10:09 ` Huang Shijie
2014-03-28 10:18 ` Lothar Waßmann
2014-03-28 9:01 ` Lothar Waßmann
2014-03-28 9:33 ` Huang Shijie
2014-03-28 9:38 ` Huang Shijie
2014-03-28 10:13 ` Lothar Waßmann
2014-03-28 10:35 ` [PATCHv3 0/2] " Lothar Waßmann
2014-03-28 10:35 ` [PATCHv3 1/2] " Lothar Waßmann
2014-03-31 2:06 ` Huang Shijie
2014-03-28 10:35 ` [PATCHv3 2/2] of/mtd/nand: add generic binding and helper for NAND_BBT_NO_OOB_BBM Lothar Waßmann
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