Creating JFFS2 Images - Revision history

Bserrano at 15:48, 14 April 2014

2014-04-14T15:48:15Z

2014-04-11T15:48:09Z

2014-03-06T21:20:37Z

2014-03-06T20:59:16Z

2014-02-27T19:07:34Z

Corrected capitalization.

2014-02-27T19:07:00Z

Added link to the page to follow after this one.

2014-02-26T21:33:16Z

2014-02-26T21:32:43Z

‎Erase Block Size

2014-02-26T21:32:25Z

‎Erase Block Size

2013-12-20T02:23:10Z

Fixed tag.

@@ Line 1: / Line 1: @@
 {{todo|SEOKWREV (11.26.13-22:20->MD+)(12.10.13-12:00->MG+)(12.17.13-12:35->KY+)(02.26.14-15:30->MW+)(03.06.14-15:00->BS-);(04.11.14-10:45->BS+)|Mike Dean|project=oe 4,oe 5,md,SEOKWREV,mg,ky,bs}}
-{{#seo:|title=Creating JFFS2 Images|titlemode=append |keywords=JFFS2,Nor Flash,Nand Flash,Linux MTD|description=This page describes the process of creating new images from existing JFFS2 images in order to resize, modify, or change parameters of the image.}}
+{{#seo:
 == Background ==
 JFFS2 (Journalling Flash File System version 2) was created to provide a better filesystem for flash memory devices.  It is a log-structured filesystem, which provides for wear-leveling of the flash.  JFFS2 supports NAND flash devices (used on all newer EMAC products), hard links, compression and garbage collection.

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-{{todo|SEOKWTODO (11.26.13-22:20->MD+)(12.10.13-12:00->MG+)(12.17.13-12:35->KY+)(02.26.14-15:30->MW+)(03.06.14-15:00->BS-)|Mike Dean|project=oe 4,oe 5,md,SEOKWTODO,mg,ky,bs}}
+{{todo|SEOKWREV (11.26.13-22:20->MD+)(12.10.13-12:00->MG+)(12.17.13-12:35->KY+)(02.26.14-15:30->MW+)(03.06.14-15:00->BS-);(04.11.14-10:45->BS+)|Mike Dean|project=oe 4,oe 5,md,SEOKWREV,mg,ky,bs}}
 == Background ==
 JFFS2 (Journalling Flash File System version 2) was created to provide a better filesystem for flash memory devices.  It is a log-structured filesystem, which provides for wear-leveling of the flash.  JFFS2 supports NAND flash devices (used on all newer EMAC products), hard links, compression and garbage collection.

← Older revision		Revision as of 21:20, 6 March 2014
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−	{{todo\|SEOKWTODO (11.26.13-22:20->MD+)(12.10.13-12:00->MG+)(12.17.13-12:35->KY+)(02.26.14-15:30->MW+)(03.06.14-15:00->BS+)\|Mike Dean\|project=oe 4,oe 5,md,SEOKWTODO,mg,ky,bs}}	+	{{todo\|SEOKWTODO (11.26.13-22:20->MD+)(12.10.13-12:00->MG+)(12.17.13-12:35->KY+)(02.26.14-15:30->MW+)(03.06.14-15:00->BS-)\|Mike Dean\|project=oe 4,oe 5,md,SEOKWTODO,mg,ky,bs}}

	== Background ==		== Background ==

← Older revision		Revision as of 20:59, 6 March 2014
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−	{{todo\|~~Complete~~ (11.26.13-22:20->MD+)(12.10.13-12:00->MG+)(12.17.13-12:35->KY+)(02.26.14-15:30->MW+)\|Mike Dean\|project=oe 4,oe 5,md,~~complete~~,mg,ky}}	+	{{todo\|SEOKWTODO (11.26.13-22:20->MD+)(12.10.13-12:00->MG+)(12.17.13-12:35->KY+)(02.26.14-15:30->MW+)(03.06.14-15:00->BS+)\|Mike Dean\|project=oe 4,oe 5,md,SEOKWTODO,mg,ky,bs}}

	== Background ==		== Background ==

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 == Using the Images ==
-The jffs2 file created above will need to be made available on a TFTP server for programming onto boards.  The [[Loading_JFFS2_Images_Onto_a_Board|Loading JFFS2 Images Onto a Board]] page describes how to load the image onto a board from a TFTP server.
+The JFFS2 file created above will need to be made available on a TFTP server for programming onto boards.  The [[Loading_JFFS2_Images_Onto_a_Board|Loading JFFS2 Images Onto a Board]] page describes how to load the image onto a board from a TFTP server.
 [[Category:Filesystems]]

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   developer@ldc:~$ sudo sumtool --input=emac-oe-rootfs.jffs2 --output=emac-oe-rootfs-summary.jffs2 \
   --eraseblock=0x20000 --pad
 [[Category:Filesystems]]

← Older revision		Revision as of 21:33, 26 February 2014
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−	{{todo\|Complete (11.26.13-22:20->MD+)(12.10.13-12:00->MG+)(12.17.13-12:35->KY+)\|Mike Dean\|project=oe 4,oe 5,md,complete,mg,ky}}	+	{{todo\|Complete (11.26.13-22:20->MD+)(12.10.13-12:00->MG+)(12.17.13-12:35->KY+)(02.26.14-15:30->MW+)\|Mike Dean\|project=oe 4,oe 5,md,complete,mg,ky}}

	== Background ==		== Background ==

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 To determine the erase block size of a NAND flash from U-Boot run the following:
   U-Boot> nand info
 The sector size reported corresponds to the erase block size.

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 === Erase Block Size ===
-The erase block size of the flash must be determined before creating the JFFS2 image. This can be found through the contents of <code>/proc/mtd</code> on a running system or through the system documentation. All NOR flashes currently used on EMAC products utilize 128 KiB erase blocks. NAND flashes use a variety of configurations, 128 KiB and 256 KiB are the most common. Contact EMAC if you unsure what value to use.
+The erase block size of the flash must be determined before creating the JFFS2 image. This can be found through the contents of <code>/proc/mtd</code> on a running system or through the system documentation. All NOR flashes currently used on EMAC products utilize 128 KiB erase blocks. NAND flashes use a variety of configurations, 128 KiB and 256 KiB are the most common.
 === Endianess ===

← Older revision		Revision as of 02:23, 20 December 2013
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−	{{todo\|~~Polish this~~ (11.26.13-22:20->MD+)(12.10.13-12:00->MG+)(12.17.13-12:35->KY+)\|Mike Dean\|project=oe 4,oe 5,md,complete,mg,ky}}	+	{{todo\|Complete (11.26.13-22:20->MD+)(12.10.13-12:00->MG+)(12.17.13-12:35->KY+)\|Mike Dean\|project=oe 4,oe 5,md,complete,mg,ky}}

	== Background ==		== Background ==