[U-Boot] [PATCH 6/6] EA20: do not use subpage write for NAND

Jon Povey
2011-04-12T00:45:50Z

Ben Gardiner wrote:
> "tries to access subpages" is maybe a little too vague; I think Jon
> Povey described the problem quite succinctly:

That's me, I better wake up!

> What's more is that the davinci nand controller could do subpage
> writing if the writing operation were informed of the extents of the
> subpage being written instead of being handed a buffer with 0xFF in
> the non-target page areas. Which, I believe is Artem's primary
> motivation for the introduction of nand_write_subpage() to the
> davinci NAND controller driver [2].

I can't remember if I posted about this at the time, but what I ended up
doing was propagating the subpage start offset and length through to all
the write_page() functions. At the appropriate place the ECC for any
"unwritten" subpages is FF'd out. It's a fairly ugly platform-specific
hack but it works, if anyone wants to see it I can dig out the patch.

--
Jon Povey
jon.povey at racelogic.co.uk

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