{"id":690,"date":"2012-11-23T23:59:46","date_gmt":"2012-11-23T23:59:46","guid":{"rendered":"https:\/\/trouble.org\/?p=690"},"modified":"2013-08-15T19:20:06","modified_gmt":"2013-08-15T19:20:06","slug":"mounting-jffs2","status":"publish","type":"post","link":"https:\/\/trouble.org\/?p=690","title":{"rendered":"mounting jffs2"},"content":{"rendered":"

After mounting a bunch of filesystems I thought I’d just whip up a little shell script to help me out when working with jffs2 images, mtd, and linux (only tested on centos 6.) I won’t go over how to get kernel support and all that crap – there are many guides, and while many won’t work eventually something will for you too ;(<\/p>\n

This one is fairly simple to use; assuming you have mounting jffs2 at all, it assumes the directory in \/mnt exists (I just named mine “\/mnt\/jffs2”) and that the device in question to be mounted will be “\/dev\/mtdblock0” (both are vars at the top of the script.) It uses flash-erase to prep the \/dev file (currently clears out 4megs there; as long as the image to be mounted is smaller, no problemo.) Not much error checking, but it works for me… in case someone else might have to deal with this stuff… should be modestly easy to change.<\/p>\n

On Ubuntu you might do the following prior to running this script (the initial “#” is the root prompt):<\/p>\n

# modprobe mtd<\/div><\/div>\n
# modprobe jffs2<\/div><\/div>\n
# modprobe mtdram<\/div><\/div>\n
# modprobe mtdchar<\/div><\/div>\n
# modprobe mtdblock<\/div><\/div>\n
<\/div>\n
<\/div>\n

Usage of below script simply “j-mount.sh jffs2-image”; it’ll complain if it can’t do it.<\/p>\n

:
\n
\n#<\/span>
\n# try to mount a jffs2 fs from a file image... assumes<\/span>
\n# kernel is ready to rumble<\/span>
\n#<\/span>
\n#<\/span>
\n# Use: $0 jffs2-image-file<\/span>
\n#<\/span>
\n#<\/span>
\n
\nusage<\/span>="Usage: $0 jffs2-image-file"<\/span>
\n
\nmtd<\/span>="\/dev\/mtdblock0"<\/span>
\nmnt<\/span>="\/mnt\/jffs2"<\/span>
\n
\nimage<\/span>="$1"<\/span>
\n
\n#<\/span>
\n# 1024*1024*4 = four megs<\/span>
\n#<\/span>
\nfour<\/span>=4194304<\/span>
\n
\nif<\/span> [<\/span> "x$image<\/span>"<\/span> == "x"<\/span> ]<\/span> ; then<\/span>
\necho<\/span> $usage<\/span>
\nexit<\/span> 1<\/span>
\nfi<\/span>
\n
\nif<\/span> [<\/span> !<\/span> -b<\/span> $mtd<\/span> ]<\/span> ; then<\/span>
\necho<\/span> "$mtd<\/span> file doesn't exist or isn't a block device: $usage<\/span>"<\/span>
\nexit<\/span> 2<\/span>
\nfi<\/span>
\n
\nif<\/span> [<\/span> !<\/span> -d<\/span> $mnt<\/span> ]<\/span> ; then<\/span>
\necho<\/span> "$mnt<\/span> directory doesn't exist: $usage<\/span>"<\/span>
\nexit<\/span> 2<\/span>
\nfi<\/span>
\n
\njmnt<\/span>=$(<\/span>df<\/span> |<\/span> grep<\/span> $mnt<\/span>)<\/span>
\n
\nif<\/span> test<\/span> $?<\/span> == 0<\/span> ; then<\/span>
\necho<\/span> Won\\'<\/span>t mount<\/span> over another file<\/span> system at $mnt<\/span>:
\necho<\/span>
\necho<\/span> " $jmnt<\/span>"<\/span>
\necho<\/span>
\nexit<\/span> 3<\/span>
\nfi<\/span>
\n
\n# \/dev\/mtdblock0 4096 544 3552 14% \/mnt\/jffs2<\/span>
\n
\n# erase the past occupants....<\/span>
\n
\necho<\/span> erasing $mtd<\/span>
\nflash_erase $mtd<\/span> 0<\/span> 0<\/span>
\n
\necho<\/span> copying $image<\/span> to $mtd<\/span>
\ndd<\/span> if<\/span>=$image<\/span> of<\/span>=$mtd<\/span> bs<\/span>=$four<\/span> count<\/span>=1<\/span>
\n
\necho<\/span> mounting $image<\/span> on $mnt<\/span>
\nmount<\/span> -t<\/span> jffs2 $mtd<\/span> $mnt<\/span>
\n
\nif<\/span> [<\/span> $?<\/span> -eq<\/span> 0<\/span> ]<\/span> ; then<\/span>
\necho<\/span>
\necho<\/span> win, it worked - $image<\/span> has been mounted on $mnt<\/span>
\necho<\/span>
\necho<\/span> df<\/span> of newly mounted filesystem:
\ndf<\/span> $mnt<\/span>
\necho<\/span>
\necho<\/span> ls<\/span> -lasg<\/span> of newly mounted filesystem:
\necho<\/span>
\n\/<\/span>bin\/<\/span>ls<\/span> -lasg<\/span> $mnt<\/span>
\necho<\/span>
\nelse<\/span>
\necho<\/span>
\necho<\/span> no luck this time....
\necho<\/span>
\nfi<\/span><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

After mounting a bunch of filesystems I thought I’d just whip up a little shell script to help me out when working with jffs2 images, mtd, and linux (only tested on centos 6.) I won’t go over how to get kernel support and all that crap – there are many guides, and while many won’t […]<\/p>\n","protected":false},"author":44,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31,176,146,6],"tags":[175,178,177],"class_list":["post-690","post","type-post","status-publish","format-standard","hentry","category-code","category-embedded","category-hack","category-tech","tag-all-that-jazz","tag-flash","tag-mtd"],"_links":{"self":[{"href":"https:\/\/trouble.org\/index.php?rest_route=\/wp\/v2\/posts\/690","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/trouble.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/trouble.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/trouble.org\/index.php?rest_route=\/wp\/v2\/users\/44"}],"replies":[{"embeddable":true,"href":"https:\/\/trouble.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=690"}],"version-history":[{"count":8,"href":"https:\/\/trouble.org\/index.php?rest_route=\/wp\/v2\/posts\/690\/revisions"}],"predecessor-version":[{"id":886,"href":"https:\/\/trouble.org\/index.php?rest_route=\/wp\/v2\/posts\/690\/revisions\/886"}],"wp:attachment":[{"href":"https:\/\/trouble.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=690"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/trouble.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=690"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/trouble.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=690"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}