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Message-ID: <20100413202409.GA4309@caffeine.csclub.uwaterloo.ca> Date: Tue, 13 Apr 2010 16:24:09 -0400 From: lsorense@...lub.uwaterloo.ca (Lennart Sorensen) To: Prabhu Chawandi <prabhu.chavandi@...il.com> Cc: linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org Subject: Re: Writing to NAND, Which is not visible to USER On Fri, Apr 09, 2010 at 05:01:58PM +0530, Prabhu Chawandi wrote: > I want to write someting to the NAND flash, which is not a part of > partitioning. > > say , out of 128 MB , I am using 64 MB which I have partitioned using > MTD, but I have to access the other 64 MB. > > Can any one help me or give me any ideas ? > > Is it possible to write using assmbly code. I am using MIPS board. I suspect you can't do that. Most devices have registers needed to access them, in the case of a NAND flash, commands like 'erase block', 'read', 'write', etc. If you try to do erase block from your program and then the kernel tries to do something in its half of the flash, who owns the registers of the NAND flash? You probably will have to just use the kernel's driver to provide another partition and then access that directly (without a filesystem) from your program. At least that way one driver is in charge of accessing the device. -- Len Sorensen -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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