From: "Jörn Engel" <joern@lazybastard.org>
To: falls huang <falls.huang@gmail.com>
Cc: linux-mtd@lists.infradead.org
Subject: Re: Does mtd support two-plane page program for nand flash?
Date: Wed, 7 Mar 2007 15:34:14 +0100 [thread overview]
Message-ID: <20070307143414.GA16439@lazybastard.org> (raw)
In-Reply-To: <49eab5c80703062257m7b26d09cha8c996aa2c8d5e07@mail.gmail.com>
On Wed, 7 March 2007 14:57:02 +0800, falls huang wrote:
>
> AFAIK , the samsung's nand flash K9LAG08U0M/K9HBG08U1M/K9MCG08U5M
> support two-plane page program. For example: The K9LAG08U0M is
> arranged in four 4Gb memory planes.Each plane contains 2,048 blocks
> and 2112 byte page registers. This allows it to perform simultaneous
> page program and block erase by selecting one page or block from each
> plane. ( refer to the datasheet of K9LAG08U0M)
Interesting. I was wondering when devices like this would show up.
Do you have a spec for those chips?
> I have searched the source of mtd/jffs2/jffs3 and I found that them
> don't support two-plane page program . How should I add two-plane page
> program ? Should I modify the source of mtd or jffs2/jffs3 ?
Not sure how much interest in this exists for JFFS2. Two NOR chips can
work in parallel just as easily as your two-plane chip. But noone has
ever tried to use this in any way.
For LogFS I am very interested. Supporting parallel writes to several
chips (or planes on one chip) is on my list. MTD should export roughly:
- one device for all planes/chips,
- preferrably eraseblock interleaving between all planes/chips or
- alternatively linearly appending all planes/chips,
- information about how many planes/chips exists.
What is the latency of reads/writes/erases? I have already asked for
the spec, haven't I? ;)
Jörn
--
The cost of changing business rules is much more expensive for software
than for a secretaty.
-- unknown
next prev parent reply other threads:[~2007-03-07 14:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-07 6:57 Does mtd support two-plane page program for nand flash? falls huang
2007-03-07 14:34 ` Jörn Engel [this message]
2007-03-09 2:15 ` falls huang
2007-03-09 8:09 ` Adrian Hunter
2007-03-09 8:37 ` Kyungmin Park
2007-03-09 11:42 ` Jörn Engel
2007-03-12 4:49 ` Marteo Tim
2007-03-12 6:53 ` Charles Manning
2007-03-12 10:58 ` Jörn Engel
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