Userspace root image - Revision history

Rainglasz: /* Mount on loopback device */ Link to jffs2 page

2009-01-28T17:40:09Z

‎Mount on loopback device: Link to jffs2 page

2009-01-25T00:19:24Z

‎Mounting the JFFS2 image on a loopback device (Kernel Memory MTD Emulation): added a link i found helpful

2009-01-08T04:27:29Z

‎Using pre-created rootfs image

2009-01-07T14:17:34Z

‎Creating a root filesystem from scratch: Remark where to find mkfs.jffs2 in Gentoo

2008-11-19T16:27:43Z

added pre to fix formatting

2008-10-26T09:03:56Z

‎Creating a root filesystem from scratch

2008-10-26T09:02:19Z

‎Creating a root filesystem from scratch

2008-10-26T09:01:31Z

‎Creating a root filesystem from scratch

2008-10-23T15:19:06Z

‎Converting a GTA02 image for GTA01

2008-10-23T14:21:40Z

‎Mount on loopback device

@@ Line 80: / Line 80: @@
 Based on this [http://www.internettablettalk.com/forums/showthread.php?p=192475#post192475 script by fanoush].
-The following is an alternate way of doing the above.
+The following is an alternate way of doing the above; you can find a suitable script also under [[Jffs2]].
 <pre>
 modprobe mtdcore

@@ Line 93: / Line 93: @@
 === Mounting the JFFS2 image on a loopback device (Kernel Memory MTD Emulation) ===
-As mounting the JFFS2 image from /dev/loop0 device is not supported, use the mtdram device as described in http://www.handhelds.org/hypermail/familiar/62/6232.html
+As mounting the JFFS2 image from /dev/loop0 device is not supported, use the mtdram device as described in http://www.handhelds.org/hypermail/familiar/62/6232.html and http://ubuntuforums.org/showthread.php?t=432481
 (On Fedora the first module to load is mtd, not mtdcore and you need to set e.g. vmalloc=256m as a kernel boot parameter for this to work.)

@@ Line 16: / Line 16: @@
 === Prebuilt ===
-See [[Downloads]] and update the list if you have more information.
+See [[Download]] and update the list if you have more information.
 === OpenEmbedded ===

@@ Line 3: / Line 3: @@
 == Creating a root filesystem from scratch ==
-To create a root file system image for storage in NAND flash, we use the mkfs.jffs2 program contained in the Debian package ''mtd-tools''.
+To create a root file system image for storage in NAND flash, we use the mkfs.jffs2 program contained in the Debian package ''mtd-tools'' or ''sys-fs/mtd-utils'' in Gentoo portage.
 <pre>

@@ Line 81: / Line 81: @@
 The following is an alternate way of doing the above.
 modprobe mtdcore
 modprobe jffs2
@@ Line 88: / Line 89: @@
 dd if=<rootfs.jffs2> of=/dev/mtd0
 mount -t jffs2 /dev/mtdblock0 <mountpoint>
 === Mounting the JFFS2 image on a loopback device (Kernel Memory MTD Emulation) ===

@@ Line 10: / Line 10: @@
 </pre>
-are typical commands.  It creates a FS image for our erase block size of 16k, padded to 0x700000 bytes in length from the files contained in the ''/tmp/jffsroot'' directory and stores the FS image in ''rootfs.jffs2''.
+are typical commands.  It creates a FS image for our erase block size of 16k (128k for GTA02), padded to 0x700000 bytes in length from the files contained in the ''/tmp/jffsroot'' directory and stores the FS image in ''rootfs.jffs2''.
 == Using pre-created rootfs image ==

@@ Line 5: / Line 5: @@
 To create a root file system image for storage in NAND flash, we use the mkfs.jffs2 program contained in the Debian package ''mtd-tools''.
- mkfs.jffs2 --pad=0x700000 -o rootfs.jffs2 -e 0x4000 -n -d/tmp/jffsroot/ # for GTA01?
+<pre>
- mkfs.jffs2 --pad=0x700000 -o rootfs.jffs2 -e 0x20000 -n -d/tmp/jffsroot/ # for GTA02
+mkfs.jffs2 --pad=0x700000 -o rootfs.jffs2 -e 0x4000 -n -d/tmp/jffsroot/ # for GTA01?
 mkfs.jffs2 --pad=0x700000 -o rootfs.jffs2 -e 0x20000 -n -d/tmp/jffsroot/ # for GTA02
 are typical commands.  It creates a FS image for our erase block size of 16k, padded to 0x700000 bytes in length from the files contained in the ''/tmp/jffsroot'' directory and stores the FS image in ''rootfs.jffs2''.

@@ Line 137: / Line 137: @@
 The steps I used are shown below (corrections welcome). Please read all of this page before executing these commands, in particular the warning to make sure that /dev/mtd0 does not map to a real flash device on your system.
 modprobe jffs2
 modprobe mtdchar
@@ Line 144: / Line 145: @@
 mount -t jffs2 -o ro /dev/mtdblock0 /mnt
 mkfs.jffs2 --little-endian -e 16 -x lzo --pad -n -r /mnt -o for_gta01.jffs2
 To clean up when you're done:
 umount /mnt
 rmmod mtdram
 [[Category:System Developers]]

@@ Line 46: / Line 46: @@
 losetup is an application to manage loop devices, if you have the "losetup -f" option (for instance debian etch does not has such option) you can use the following commands:
 export loop=$(losetup -f)
 losetup $loop <rootfs.jffs2>
@@ Line 53: / Line 54: @@
 mkdir <mountpoint>
 mount -t jffs2 -o ro /dev/mtdblock0 <mountpoint>
+</pre>
 "losetup -f" just returns the first unused loop device, if your system do not comes with "losetup -f" just chose the first /dev/loop* device that is unused and change the first line with: