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From: Sascha Hauer <sha@pengutronix.de>
To: "Middelschulte, Leif" <Leif.Middelschulte@klsmartin.com>
Cc: "barebox@lists.infradead.org" <barebox@lists.infradead.org>
Subject: Re: imx6 nand: dbbt version/layout
Date: Mon, 3 May 2021 14:32:33 +0200	[thread overview]
Message-ID: <20210503123232.GJ19819@pengutronix.de> (raw)
In-Reply-To: <78f79375e21e753086868b2212485b488443bcb1.camel@klsmartin.com>

Hi Leif,

On Thu, Apr 22, 2021 at 12:13:59PM +0000, Middelschulte, Leif wrote:
> Hi,
> 
> I'm in the process of fixing up imx-kobs to support
> - boot configuration dumps
> - boot stream extracts/updates
> on iMX6QDL using the GPMI-NAND interface, as provided by some more
> "recent" kernels.
> 
> I updated barebox on the NAND flash storage using another instance of
> barebox. Now it turns out that the dbbt version used (i.e. written) by
> barebox and supported by imx-kobs (as it was) is not documented in the
> i.MX6 QDL reference manual.
> Barebox uses[0] DBBT version 0x1000000, while the reference manual
> describes (i.MX6DQRM Rev 3., section 8.5.2.4) layout version 0x1.

It's stored in big endian. Just endianess swap 0x01000000 and you have
your 0x00000001.

> 
> Besides that, the reference manual apparently does not describe the
> field `BBMarkerPhysicalOffsetInSpareData` at the end of the FCB
> structure. Yet again, imx-kobs and barebox are reading/writing it.

barebox doesn't actively sets the value to anything else than 0x0. I
have no idea if and how the ROM interprets this value. Indeed the name
of the field seems to be inconsistent to the reference manual.

Regards,
  Sascha


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  reply	other threads:[~2021-05-03 12:34 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-22 12:13 Middelschulte, Leif
2021-05-03 12:32 ` Sascha Hauer [this message]
2021-06-11 15:16   ` Middelschulte, Leif

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