imx6 nand: dbbt version/layout

[Middelschulte, Leif]

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.

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.

So I'm wondering which behavior is correct?

[0]
https://git.pengutronix.de/cgit/barebox/tree/common/imx-bbu-nand-fcb.c?id=af0f068a6edad45b033e772056ac0352e1ba3613#n675


Best regards,

Leif
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