From: Alex Dubov <oakad@yahoo.com>
To: "Jörn" Engel <joern@logfs.org>
Cc: linux-mtd@lists.infradead.org
Subject: Re: Support of removable MTD devices and other advanced features (follow-up from lkml)
Date: Sat, 24 May 2008 20:41:17 -0700 (PDT) [thread overview]
Message-ID: <346401.5675.qm@web36705.mail.mud.yahoo.com> (raw)
In-Reply-To: <20080524175647.GA7366@logfs.org>
--- Jörn Engel <joern@logfs.org> wrote:
> On Sat, 24 May 2008 06:12:23 -0700, Alex Dubov wrote:
> >
> > Do UBI and JFFS always operate in terms of whole eraseblocks or they may
> > attempt partial block writes? Different flash chips have different
> > capabilities in regard to writing and this can be used to some advantage.
>
> Writes happen in multiples of mtd->writesize. Which for NAND is
> pagesize. There are also special cases with subpage writes. AFAIK only
> UBI exploits that feature.
>
Most xd cards can only be written a whole PEB in a time (can be handled with
appropriate writesize, I suppose).
Memorystick cards can be written page at a time, but only in progressive
fashion - only if all pages at lower offsets to the current page were written
before. This can be made to work as a useful optimization.
Are there any special tricks with subpage writes or it all amounts to "read
block" -> "merge changes" -> "write block"?
next prev parent reply other threads:[~2008-05-25 3:41 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-20 13:59 Support of removable MTD devices and other advanced features (follow-up from lkml) Alex Dubov
2008-05-21 6:47 ` Artem Bityutskiy
2008-05-21 8:41 ` Jörn Engel
2008-05-22 1:30 ` Alex Dubov
2008-05-22 15:10 ` Jörn Engel
2008-05-23 2:47 ` Alex Dubov
2008-05-23 5:50 ` Jörn Engel
2008-05-23 9:33 ` Alex Dubov
2008-05-23 9:59 ` Jörn Engel
2008-05-23 12:49 ` Alex Dubov
2008-05-23 13:28 ` Jörn Engel
2008-05-24 13:12 ` Alex Dubov
2008-05-24 17:56 ` Jörn Engel
2008-05-25 3:41 ` Alex Dubov [this message]
2008-05-25 7:25 ` Jörn Engel
2008-05-25 13:30 ` Jamie Lokier
2008-05-25 16:24 ` Jörn Engel
2008-05-25 16:35 ` Jamie Lokier
2008-05-25 16:55 ` Jörn Engel
2008-05-26 2:12 ` Alex Dubov
2008-05-21 9:06 ` David Woodhouse
2008-05-21 9:29 ` Jörn Engel
2008-05-21 15:20 ` Alex Dubov
2008-05-21 15:22 ` David Woodhouse
2008-05-21 15:41 ` Alex Dubov
2008-05-21 20:45 ` Jörn Engel
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