What type of this .img file?

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Tony

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Jun 4, 2011, 3:25:19 PM6/4/11
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Hello,

I'm new to android dev and learning how to port gingerbread to my
samsung i9003.
I successfully converted partitions on the phone from samsung's RFS
to ext2.
But I have a problem, I need to modify the file init.rc to change the
mount option to ext2. but the file is in ramfs, and I need to modify
its source.
There are to .img file which I think init.rc is placed -
normalboot.img and recover.img. I have no idea what type of these
files are.
But I open it in a hex editor and found that the very first byte of
the file is a string "ANDROID".
Could someone give me a hint what these file are and how can I open or
extract(repack) it?
Is it a type of file system?

Tony

hedwin

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Jun 5, 2011, 4:07:34 PM6/5/11
to crack...@gmail.com, android-porting
Did you try yaffs2


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Ashwini Singh

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Jun 6, 2011, 1:05:40 AM6/6/11
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Hi Tony,



TO UNPACK:
$ mkdir open_ram
$ cd open_ram
$ gunzip -c ../your-ramdisk-file | cpio -i

PACK it again:
$ cd <open_ram>
$ find . | cpio -o -H newc | gzip > ../newramdisk.cpio.gz



Thanks.

Linux Box Solutions

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Jun 6, 2011, 2:32:43 AM6/6/11
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Read this link it's very simple on how to open and edit these partitions

http://android-dls.com/wiki/index.php?title=HOWTO:_Unpack%2C_Edit%2C_and_Re-Pack_Boot_Images

http://forum.xda-developers.com/archive/index.php/t-443994.html

Linux Box Solutions

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Jun 4, 2011, 10:51:51 PM6/4/11
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My splash image though keeps loading like a garbled mess

Linux Box Solutions

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Jun 5, 2011, 7:55:28 PM6/5/11
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Read this link it's very simple on how to open and edit these partitions 


Phinitnan Chanasabaeng

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Jun 6, 2011, 12:16:43 AM6/6/11
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hedwin,

I already tried all partition type supported by stock samsung's kernel (ext2,rfs,j2fs?). I also tried extract the file with unyaffs but no luck.
It also seems samsung's system.rfs & userdata.rfs are not actually partition image of rfs. This is very confuse me.

Linux Box Solution,

Thank you for your link. I'll read them to find what I can do.

Linux Box Solutions

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Jun 6, 2011, 1:40:42 AM6/6/11
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Already gave him the tutorials with scripts much easier also depending on device you may have to add header info which the tutorials explain also

Phinitnan Chanasabaeng

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Jun 6, 2011, 1:42:33 AM6/6/11
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Ashwini Singh,

Thank you for your suggestion. But the files are not even the gz form. It seems like the files are packed in to a single image which I don't know its type yet.
I'll post here if I can find a solution.

Phinitnan Chanasabaeng

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Jun 6, 2011, 1:55:15 AM6/6/11
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I think it may help if i provide more info.
Samsung packed their firmware into files which after extracted are,
- boot.bin
- modem.bin
- slb.bin
- param.lfs
- normalboot.img
- recovery.img
- cache.rfs
- system.rfs
- userdata.rfs

What i guess about these files:
- the first 3 files are bootloader, modem and secondary bootloader
- have no clue what the param.lfs is.
- the .img files are where I should look at (the main & backup kernel+ramfs files, I guess)
- the .rfs files are the platform file, I though they are rfs partition images but they are not. Could be some kind of compressed files.

when open the .img files, their header started with 'ANDROID'. So I guess they might relate to android project in some way.

Tony

Linux Box Solutions

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Jun 6, 2011, 2:17:31 AM6/6/11
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Linux Box Solutions

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Jun 6, 2011, 2:22:33 AM6/6/11
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Read this link it's very simple on how to open and edit these partitions

http://android-dls.com/wiki/index.php?title=HOWTO:_Unpack%2C_Edit%2C_and_Re-Pack_Boot_Images

http://forum.xda-developers.com/archive/index.php/t-443994.html

Phinitnan Chanasabaeng

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Jun 6, 2011, 3:38:20 AM6/6/11
to Linux Box Solutions, android...@googlegroups.com
Dear all,

by following the instruction from Linux Box Solutions, I'm now able to extract the ramfs file.
Next, I'll try to replace the system.rfs & userdata.rfs with my own build.

Thank you.

Tony

On Mon, Jun 6, 2011 at 1:20 PM, Linux Box Solutions <linuxbox...@gmail.com> wrote:
On Jun 4, 2011 3:38 PM, "Tony" <crack...@gmail.com> wrote:

Linux Box Solutions

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Jun 6, 2011, 10:55:53 AM6/6/11
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Linux Box Solutions

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Jun 6, 2011, 10:57:56 AM6/6/11
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Well the android header means it's just a simple partition or something like that thats android specific

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Ismael Miguel

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Sep 1, 2011, 2:46:29 PM9/1/11
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img files are disk images, like iso or cso...
those files where used when was no iso or cso...
but, those files are also a image format (check out on any
good image editor)...
i would like to have some help cause i want to edit a img file
on android itself!!!
i know that it's not the right place but needed here...
i want to edit a img file to insert some zip files on it to
run windows 95 correctly, with network and creative blast 16
drivers to have sound...
please, help me!!!

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