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Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 Content-Language: en-US X-CMAE-Envelope: MS4wfONGJyKLOsu3zAWn4WZNS56vYkuscse8WaKTnRAnIlarGrK8+5dnthGAd3XYQl58xmdEupDxcpZm6Iat37ML36O2hYNu17OQ30purh1djnyJDUQ1VbC/ cdRuKBu7tESYkxVl1CcUCUNSUAmYiyAT62wI234OyyJTjKsqh4Ub896wdJZCFBHtYAMACSfKeqDTOA== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191107_013939_128371_6EA73714 X-CRM114-Status: UNSURE ( 8.14 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.7 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at https://www.dnswl.org/, low trust [194.109.24.31 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Hi, the attached patch contains an update to the mtd-www ubifs faq:  * Mention user-space tools for unwrapping UBI and UBIFS images. Note that I am the author of the ubidump tool. * A note about the vidhdrofs argument to modprobe. willem --- a/faq/ubifs.xml +++ b/faq/ubifs.xml @@ -915,12 +915,19 @@ mount -t ubifs /dev/ubi0_0 /mnt/ubifs

How do I extract files from an UBI/UBIFS image?

-

Unfortunately, at the moment there are no user-space tools which can -unwrap UBI and UBIFS images. UBIFS cannot be loop-back mounted either, -because it does not work with block devices.

+

+ There are a couple of python tools for extracting and analyzing UBI images. +

    +
  • ubi_reader - Collection of Python scripts for reading information about and extracting data from UBI and UBIFS images.
    • +
  • ubidump - Tool for viewing and extracting files from an UBIFS image.
    • +
+ There is also a company selling a closed source windows tool to do the same. +

-

However, kernel modules exist that allow you to create a virtual MTD -onto which UBIFS can be mounted. You have two options: +

+ UBIFS cannot be loop-back mounted because it does not work with block devices. + However, kernel modules exist that allow you to create a virtual MTD + onto which UBIFS can be mounted. You have two options:

  1. nandsim, which can simulate various NAND devices. You can find an incomplete list of those devices @@ -971,7 +978,7 @@ ubimkvol /dev/ubi0 -N "My UBIFS volume name" -s $VOLSIZE ubiupdatevol /dev/ubi0_0 ubifs.img # Mount it to any desired mount point -mount /dev/ubi0_0 /mnt/ubifs +mount -t ubifs /dev/ubi0_0 /mnt/ubifs

    Now you have the filesystem in /mnt/ubifs. Use @@ -987,9 +994,13 @@ the process is simpler. Write the image to the MTD via ubiformat -f ubi.img (assuming that is the name of your image file). You should be able to skip the instructions above after -modprobe ubi mtd=0, since +modprobe ubi mtd=/dev/mtd0,2048, since the UBI image should take care of the volume(s) itself. - +

    + Note that the vidhdrofs ( the second argument after mtd=) is important, + for images with a larger eraseblock size this will also be a larger value. + With 256K eraseblocks you would need 4096 there. +

    I need more space - should I make UBIFS journal smaller?