From: Ben Dooks <ben-linux@fluff.org>
To: Gaurav Singh <gausinghnsit@gmail.com>
Cc: linux-mtd@lists.infradead.org
Subject: Re: Writing to NAND using DMA
Date: Mon, 10 Nov 2008 14:05:49 +0000 [thread overview]
Message-ID: <20081110140549.GD11063@fluff.org.uk> (raw)
In-Reply-To: <3cc7a0df0811050319t7d4b2542hcef73780ebfc9906@mail.gmail.com>
On Wed, Nov 05, 2008 at 04:49:58PM +0530, Gaurav Singh wrote:
> I am working on an ST Nomadik board with ST 1 GB NAND chip. Have
> written a board specific driver and trying to use DMA and JFFS2
> filesystem to write data to the NAND .
>
> I have allocated a nand_buffer structure using dma_alloc_coherent and
> am using this buffer for reading data.
>
> In case of write however I see that the JFFS2 filesystem has allocated
> a wbuf for writing (using kmalloc). Now I have an option of copying
> this buffer into a dma able buffer of my own but I feel there should
> be a better solution.
>
> What is your view ? Should JFFS2 provide a dma able buffer to write a
> NAND page ?
This discussion came up at CELF, I belive that there is a move to try
and make the mtd interface take only DMA-safe memory since it is not
only JFFS2 that may be using the NAND driver.
--
Ben (ben@fluff.org, http://www.fluff.org/)
'a smiley only costs 4 bytes'
prev parent reply other threads:[~2008-11-10 14:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-05 11:19 Writing to NAND using DMA Gaurav Singh
2008-11-10 14:05 ` Ben Dooks [this message]
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