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    <p>I use the same chip, <em>Micron MT29F2G08ABAEA</em>, on an IMX25 design. The chain <em>mtd->ubi->ubifs</em> are quite happy with this chip set. Our differences are the <a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/mtd/nand" rel="nofollow">NAND flash controllers</a> and their configuration.</p> <p>The <em>Micron</em> chip has <em>sub-pages</em> and your controller may not support that. Searching through <a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/mtd/nand/davinci_nand.c" rel="nofollow">davinci_nand.c</a>, I don't see any <em>sub-page</em> handling. </p> <p>For the <em>MXC Nand</em> controller, we are using <code>hw_ecc</code>, <code>flash_bbt</code>, and a <code>width</code> of one. The <em>Micron</em> chip is only <em>8-bit</em>, although there are some <em>16-bit</em> versions like <em>Micron MT29F2G16ABAEA</em>. Make sure the geometry is correct. I think the Linux MTDs supports several chips in parallel.</p> <p>It is quick to verify if that part is faster or not with the data sheets. I suspect the <em>ST</em> part is slower than the <em>Micron</em> part and timing is not your issue.</p> <p>Timing analysis of the <em>Micron MT29F2G08ABAEA</em> indicated that the IMX25 NAND flash controller was actually the bottle neck. The <em>Micron</em> Flash seems quite fast. It is either a bug in the <em>NAND controller</em> or more likely a configuration issue.</p> <p>Some other information that is helpful (for you or someone to help you),</p> <ul> <li>Some <code>dmesg</code> or <em>console</em> output. </li> <li>A link to data sheets.</li> <li>The exact <em>NAND controller</em> used.</li> <li>The <strong>platform data</strong> or <strong>DT</strong> info used.</li> <li><code>grep '^[^#].*MTD' .config</code> or <em>MTD</em> related configuration.</li> </ul> <p>I don't think anyone can answer your question out-right, but I am glad to be surprised.</p>
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    1. COOk I found I was wrong at the Block Size settings so I changed it. I got the solution.
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    2. COAs I am fetching my Environment variables from the U-Boot. So I needed to make changes in the U-boot as well as Changed the U-boot-header file for the NAND Pagesize according to your NAND.
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    3. CO@ParthivShah: If an answer is sufficient in your opinion, you can click the **checkbox** under the up/down arrows for that answer. Sometimes, people wait some time as better answers may be received. I see you have accepted no answers to any of your questions, so I think you might not know about this?
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