[U-Boot] [PATCH 1/3] mtd/nand : Add function board_nand_init_tail() for some special NAND controllers

[Mike Frysinger]

On Tuesday 22 November 2011 16:11:20 Scott Wood wrote:
> On 11/22/2011 03:03 PM, Mike Frysinger wrote:
> > On Tuesday 22 November 2011 03:54:14 Shengzhou Liu wrote:
> >> In some NAND controllers there is a size limitation of RAM buffer(2K
> >> bytes). To support large-page NAND chips with greater than 2K pagesize,
> >> we need a large buffer, but we don't know pagesize before calling
> >> nand_scan_ident(), for more flexible and to identify different cases of
> >> large-page greater than 2K bytes, we have a board_nand_init_tail()
> >> between nand_scan_ident() and nand_scan_tail().
> > 
> > iirc, newer Linux mtd tree handles this better by breaking up the code
> > paths so individual drivers can call things in the right order.  perhaps
> > we should update our mtd stack so we can do that ?
> 
> We already have that on the mtd side -- this patch uses it.  The issue
> is the U-Boot glue code calling nand_scan() rather than letting the
> drivers control the process.
> 
> This patch is less intrusive than changing all the drivers, but if
> someone wants to actually do that (without breaking anything), or more
> realistically set up a transition mechanism, that'd be great. :-)

ok, so it is a short coming in the current u-boot mtd framework that we should 
look at migrating away from.  no, i'm not volunteering to take this on :).
-mike
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