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From: David Gibson <david@gibson.dropbear.id.au>
To: Segher Boessenkool <segher@kernel.crashing.org>
Cc: linuxppc-dev <Linuxppc-dev@ozlabs.org>
Subject: Re: [PATCH] powerpc: Create "rom" (MTD) device prpmc2800
Date: Thu, 14 Jun 2007 14:29:07 +1000	[thread overview]
Message-ID: <20070614042906.GC11177@localhost.localdomain> (raw)
In-Reply-To: <791ab8b82c5b5d2b3ae4827a891a43ea@kernel.crashing.org>

On Wed, Jun 13, 2007 at 11:37:42AM +0200, Segher Boessenkool wrote:
> >> How do non-device-tree MTD users handle this?
> >
> > Invidual, board-specific map files with hardcoded partition tables.
> 
> That's what I was afraid of.  Sigh.
> 
> > See drivers/mtd/maps/ebony.c for example.
> 
> [/me looks...]  Oh horror.
> 
> > Hence my view of the device
> > tree as a preferable option.
> 
> I think some binary partition table format that can be
> used by _all_ MTD consumers should be defined.  How
> that table should be communicated to the kernel in the
> device tree case we can discuss later, then.  Maybe
> something as simple as storing it in flash, and have a
> "partition-table-offset" property or something like that.
> 
> This is something the MTD people will have to buy into
> of course.

I tought I saw some config option implying that there already existed
an on-device partition table format for flashes.  Doesn't help us for
existing boards which don't expect such a setup, of course.

Incidentally, with either the partitions-described-by-properties, or
the revised more-flexible partitions-described-by-subnodes format, I'm
not seeing it as required that the whole of the flash address space be
described.  So it would certainly be possible to *only* describe the
sections of the flash used by firmware.  But I'm suggesting that we
optionally allow other partitions to be described for boards / systems
which have strong conventions about how the flash is divided and where
we don't have any other way of recording the partition layout short of
hardcoding.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

  reply	other threads:[~2007-06-14  4:29 UTC|newest]

Thread overview: 81+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-01 23:20 [PATCH] powerpc: Create "rom" (MTD) device prpmc2800 Mark A. Greer
2007-06-02  8:46 ` Segher Boessenkool
2007-06-04 20:56 ` Mark A. Greer
2007-06-05 20:35   ` Sergei Shtylyov
2007-06-05 21:11     ` Mark A. Greer
2007-06-06 12:41       ` Sergei Shtylyov
2007-06-07 15:08         ` David Woodhouse
2007-06-06  2:39   ` David Gibson
2007-06-07 13:30     ` Segher Boessenkool
2007-06-12  4:42       ` David Gibson
2007-06-12 10:50         ` Segher Boessenkool
2007-06-13  6:12           ` David Gibson
2007-06-13  9:13             ` Segher Boessenkool
2007-06-13  9:19               ` David Gibson
2007-06-13  9:37                 ` Segher Boessenkool
2007-06-14  4:29                   ` David Gibson [this message]
2007-06-14  8:00                     ` Segher Boessenkool
2007-06-14 12:39                     ` Sergei Shtylyov
2007-06-14 13:20                       ` Segher Boessenkool
2007-06-14 12:48           ` Sergei Shtylyov
2007-06-14 13:18             ` Segher Boessenkool
2007-06-14 12:50         ` Sergei Shtylyov
2007-06-14 13:43           ` Segher Boessenkool
  -- strict thread matches above, loose matches on Subject: below --
2007-06-02  4:30 Milton Miller
2007-06-02  7:39 ` Benjamin Herrenschmidt
2007-06-03 16:10   ` Sergei Shtylyov
2007-06-03 17:36     ` Segher Boessenkool
2007-06-03 18:03       ` Sergei Shtylyov
2007-06-03 18:25         ` Segher Boessenkool
2007-06-03 18:36           ` Sergei Shtylyov
2007-06-03 18:46             ` Segher Boessenkool
2007-06-03 19:16               ` Sergei Shtylyov
2007-06-03 21:04         ` Benjamin Herrenschmidt
2007-06-04 12:34           ` Sergei Shtylyov
2007-06-04 14:37             ` Segher Boessenkool
2007-06-04 14:49               ` Sergei Shtylyov
2007-06-07 14:53           ` David Woodhouse
2007-06-07 15:49             ` Segher Boessenkool
2007-06-07 14:47         ` David Woodhouse
2007-06-07 15:32           ` Segher Boessenkool
2007-06-02  8:53 ` Segher Boessenkool
2007-06-03 16:22   ` Sergei Shtylyov
2007-06-03 17:40     ` Segher Boessenkool
2007-06-03 18:31       ` Sergei Shtylyov
2007-06-03 18:44         ` Segher Boessenkool
2007-06-03 19:13           ` Sergei Shtylyov
2007-06-03 19:56             ` Segher Boessenkool
2007-06-03 20:26               ` Sergei Shtylyov
2007-06-04  8:07                 ` Segher Boessenkool
2007-06-04 13:34                   ` Sergei Shtylyov
2007-06-07 15:00                 ` David Woodhouse
2007-06-07 15:55                   ` Segher Boessenkool
2007-06-07 16:05                     ` David Woodhouse
2007-06-07 16:46                       ` Segher Boessenkool
2007-06-12  4:44                     ` David Gibson
2007-06-12 10:53                       ` Segher Boessenkool
2007-06-13  3:16                         ` David Gibson
2007-06-13  5:05                           ` Segher Boessenkool
2007-06-13  6:11                             ` David Gibson
2007-06-13  9:10                               ` Segher Boessenkool
2007-06-15  4:12                                 ` David Gibson
2007-06-15 11:22                                   ` Segher Boessenkool
2007-06-15  4:14                     ` David Gibson
2007-06-15  8:42                       ` Segher Boessenkool
2007-06-15  8:47                         ` David Woodhouse
2007-06-15  8:59                           ` Segher Boessenkool
2007-06-03 21:12     ` Benjamin Herrenschmidt
2007-06-04  8:11       ` Segher Boessenkool
2007-06-04 13:16         ` Sergei Shtylyov
2007-06-04 12:41       ` Sergei Shtylyov
2007-06-04 14:49         ` Segher Boessenkool
2007-06-04 15:54           ` Sergei Shtylyov
2007-06-03 17:29 ` Sergei Shtylyov
2007-06-03 17:45   ` Segher Boessenkool
2007-06-03 18:18     ` Sergei Shtylyov
2007-06-03 18:43       ` Segher Boessenkool
2007-06-03 18:59         ` Sergei Shtylyov
2007-06-03 19:48           ` Segher Boessenkool
2007-06-03 20:10             ` Sergei Shtylyov
2007-06-04  8:02               ` Segher Boessenkool
2007-06-04 19:40 ` Mark A. Greer

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