want to edit your boot.img?
included files in zip: mkbootimg (i compiled this file from android source), unpack-bootimg.pl, repack-bootimg.pl
i edited the repack script to compile the nexus s img correctly.
Code:
--base 0x30000000 --pagesize 4096
first dump original boot.img:
Code:
cat /dev/mtd/mtd2 > /sdcard/boot.img
then drag/drop to your linux box to edit file.
use unpack script:
Code:
./unpack-bootimg.pl boot.img
you will end up with 2 compressed files and 1 folder.
finished editing and want to repack boot.img, for example:
Code:
./repack-bootimg.pl <kernel> <ramdisk-directory> <outfile>
most info and scripts pulled from here: http://android-dls.com/wiki/index.php?title=HOWTO:_Unpack,_Edit,_and_Re-Pack_Boot_Images, thanks to the original author.
test your new boot.img:
Code:
fastboot boot boot.img
Two things:
1. if you have any bad blocks in your boot partition, this method will fail to extract the boot.img (you need to skip bad blocks, but cat will just get an error)
2. you can replace just the kernel (leaving the ramdisk and parameters intact) using:
Code:
% fastboot flash zimage zImage
The bootloader will read-modify-write the boot partition, replacing the kernel only.
how would you skip bad blocks? i never thought of a phone as having bad blocks.
k0mpresd said:
i never thought of a phone as having bad blocks.
Click to expand...
Click to collapse
All flash devices can have bad blocks. But it usually isn't something the end user would notice, unless there are so many and something is wrong that you're losing drive space.
edit: more info here if your curious http://en.wikipedia.org/wiki/Flash_memory
hmm, very strange thing happening to me. I've only gotten my boot.img to compile and boot successfully once with this method, but now I can't seem to get it to compile? I keep getting errors of the file name or file type. I'm using the correct usage.. If I compile manually with mkbootimg on the cmd line it'll compile but it won't boot. Just bootloops at the Google splash..
Jroid try my Matr1x kernel and see what happens
Sent from my Nexus S using XDA App
The problem seems to be compiling the boot with the perl scripts, not the kernel itself.
Try manually:
Once unpacked do the boot.img-ramdisk.cpio.gz with the following command (moved to the ramdisk folder):
Code:
#sudo find . | cpio -o -H newc | gzip > ../<your boot name>.img-ramdisk.cpio.gz
Then cd ../
And repack:
Code:
#./mkbootimg --kernel <your boot name>.img-kernel.gz --ramdisk <your boot name>.img-ramdisk.cpio.gz --base 0x30000000 --pagesize 4096 -o boot.img
you can replace just the kernel (leaving the ramdisk and parameters intact) using:
Code:
% fastboot flash zimage zImage
The bootloader will read-modify-write the boot partition, replacing the kernel only.
Click to expand...
Click to collapse
It won't work on the Nexus S.
python08 said:
It won't work on the Nexus S.
Click to expand...
Click to collapse
exactly, i'd love to be able to do this for some testing but it doesn't allow me.
EDIT: yes it does. Swetland is right
Chamb' said:
Try manually:
Once unpacked do the boot.img-ramdisk.cpio.gz with the following command (moved to the ramdisk folder):
Code:
#sudo find . | cpio -o -H newc | gzip > ../<your boot name>.img-ramdisk.cpio.gz
Then cd ../
And repack:
Code:
#./mkbootimg --kernel <your boot name>.img-kernel.gz --ramdisk <your boot name>.img-ramdisk.cpio.gz --base 0x30000000 --pagesize 4096 -o boot.img
Click to expand...
Click to collapse
I've tied compiling a boot both manually (with cmdline) and with the perl scripts and have used a simple kernel.gz and ramdisk.cpio.gz for my file names.. doesn't really matter what I name it as long as it has the correct file format in this .gz and .cpio.gz right? the manual compile goes fine with base 0x30000000 and pagesize 4096
however, it does not boot and will bootloop at the Google splash
Used boot.img extracted from (what ROM ?) cat /dev/mtd/mtd2 ?
Is the phone start with this boot.img (unchanged) if you flash it by typing "fastboot flash..." ?
After that, just try to unpack and repack the boot.img without changes on ramdisk or kernel, if it works that means your changes suck (^^).
These commands (or perl scripts) work perfectly for me.
Lol I will try doing that. The boot.img I used is from stock 2.3.4, edited the ramdisk (specifically init.rc & init.herring.rc)
Like I said, first time I used the perl scripts I edited my ramdisk, threw in a netarchy kernel, it compiled fine and booted. Now if I use the perl script to repack with an aosp kernel, it gives me an error about file name and/or extension being wrong. Or complains it can't find mkbootimg when its there and executable. I'll re run it again and post errors
Sent from my Nexus S
he guys where is the boot image located? not the animation, the google logo at the start of the booting!
Sent from my Nexus S using XDA Premium App
ok so when I used the repack-bootimg.pl script, it kept giving me this error:
Code:
boot.img-kernel.gz Not a directory at ./repack-bootimg.pl line 13.
So I ran mkbootimg manually, without a cmdline comment as stated above. It compiled
and booted beautifully all stock with no init.rc or init.herring.rc edits.
however when I compile a boot.img coupled with a stock kernel and a modified ramdisk, I get a non-booting boot.img. One came out at 2.9 mb and the other at 5.6 mb neither boots using the same cmd that compiled the working boot. Must be my edits.. I literally only changed about 1 line in init.rc and another line in init.herring.rc that causing it not to boot.
By the way, I got some info on a stock boot.img using the unpackbootimg binary (not the perl script) and here's what it outputs:
Code:
#BOARD_KERNEL_CMDLINE console=ttyFIQ0 no_console_suspend
BOARD_KERNEL_BASE 30000000
BOARD_PAGE_SIZE 00001000
I enter that pagesize and it says it's not a valid value when I compile boot.img's
Borky_16 said:
he guys where is the boot image located? not the animation, the google logo at the start of the booting!
Sent from my Nexus S using XDA Premium App
Click to expand...
Click to collapse
part of the kernel
to change-https://github.com/morfic/Samsung-logo
ogdobber said:
part of the kernel
to change-https://github.com/morfic/Samsung-logo
Click to expand...
Click to collapse
yeah i know thanks for the link a helping source though!
Sent from my Nexus S using XDA Premium App
Sorry for the Control C Control V of it, but I just found this topic now..
I`m facing this problem when I try to unpack boot.img..
I have done it 2 days ago but dunno why, now I can`t..
Follows what is happening..
Code:
[email protected]:~/NS-bootwork$ ./unpack-bootimg.pl boot.img
Found a secondary file after the ramdisk image.
According to the spec (mkbootimg.h) this file can exist,
but this script is not designed to deal with this scenario.
The Kernel is built, as a zImage and the WLAN as a bmc3429.ko..
Just repeating, I have built this Kernel 2 days ago in the same way, without any problems, but now I`m struggling on the message after inputting ./unpack-bootimg.pl boot.img..
Dunno what else to try, I re-downloaded the unpack-bootimg.pl from 2 different sources, and still the same error..
Any ideas?
Many thanks..
P.S.: Ubuntu 11.04 x64..
EDIT
Well, I already solve it!
That is what I did..
As unpack-bootimg.pl was not working (don`t know why) I used split_bootimg.pl script, splitting the boot.img and created new ramdisk img..
Code:
./split_bootimg.pl boot.img
mkdir ramdisk
cd ramdisk
gzip -dc ../boot.img-ramdisk.gz | cpio -i
find . | cpio -o -H newc | gzip > ../newramdisk.cpio.gz
Then after just compiled the Kernel with
Code:
./mkbootimg --kernel zImage --ramdisk newramdisk.cpio.gz --base 0x30000000 --pagesize 4096 --cmdline _console_suspend=1 console=bull's -o newtestboot.img'no
Witches includes " --cmdline _console_suspend=1 console=bull's" to not break BT functionality, in the case of Nexus S..
I found the tools here work well: http://glandium.org/blog/?p=2214
...if you then use the code originally posted above:
Code:
sudo find . | cpio -o -H newc | gzip > ../<your boot name>.img-ramdisk.cpio.gz
./mkbootimg --kernel <your boot name>.img-kernel.gz --ramdisk <your boot name>.img-ramdisk.cpio.gz --base 0x30000000 --pagesize 4096 -o boot.img
If you interested in extracting the kernel image from the Samsung Galaxy S5 ROM, you should follow the following steps.
This is was tested with the G900VVRU1ANCG_G900VVZW1ANCG_VZW stock ROM firmware.
The first is extracting the files from the ROM firmware file, this is explained in many places and won't be covered here.
Extract the boot.img to some directory, using the Android unpackbootimg utility:
Code:
unpackbootimg -i boot.img -o boot/
After extracting the boot.img file you will usually end up with the following file list:
Code:
boot.img-base
boot.img-cmdline
boot.img-pagesize
boot.img-ramdisk.gz <- this includes the root (/) files, like init*.rc and SELinux policy files
boot.img-zImage <- compressed image of the Android Linux kernel
Next step will be extracting the compressed kernel image from the zImage file. The Android kernel is a self-extracting compressed file, while different devices use different compression methods. While looking at the file contents using hex editor, you can see the decompression code at the beginning, and then at some point the compressed data begins. The compressed image begins where you find the LZO magic header.
Code:
static const unsigned char lzop_magic[9] = {
0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a
};
Save the data from the LZO magic header to the end of the file with the zImage.kernel file name.
This firmware and kernel are using LZO compression, and there is an easy to use utility called lzop that is used for the decompression of the file. Just run the following command to decompress the kernel from the zImage.kernel file:
Code:
lzop -d -c zImage.kernel > zImage.kernel.decompressed
And now you have the decompressed kernel for the device ready for exploration, which is also attached to this post.
Note:
I've tried using different scripts that do the job, including galaxys2_kernel_repack and http://forum.xda-developers.com/showthread.php?t=901152 but both failed while extracting the kernel image, although were able to extract the begin position for the LZO compression header.
But it does trip KNOX after flashing, doesn't it?
roman.blachman said:
If you interested in extracting the kernel image from the Samsung Galaxy S5 ROM, you should follow the following steps.
This is was tested with the G900VVRU1ANCG_G900VVZW1ANCG_VZW stock ROM firmware.
The first is extracting the files from the ROM firmware file, this is explained in many places and won't be covered here.
Extract the boot.img to some directory, using the Android unpackbootimg utility:
Code:
unpackbootimg -i boot.img -o boot/
After extracting the boot.img file you will usually end up with the following file list:
Code:
boot.img-base
boot.img-cmdline
boot.img-pagesize
boot.img-ramdisk.gz <- this includes the root (/) files, like init*.rc and SELinux policy files
boot.img-zImage <- compressed image of the Android Linux kernel
Next step will be extracting the compressed kernel image from the zImage file. The Android kernel is a self-extracting compressed file, while different devices use different compression methods. While looking at the file contents using hex editor, you can see the decompression code at the beginning, and then at some point the compressed data begins. The compressed image begins where you find the LZO magic header.
Code:
static const unsigned char lzop_magic[9] = {
0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a
};
Save the data from the LZO magic header to the end of the file with the zImage.kernel file name.
This firmware and kernel are using LZO compression, and there is an easy to use utility called lzop that is used for the decompression of the file. Just run the following command to decompress the kernel from the zImage.kernel file:
Code:
lzop -d -c zImage.kernel > zImage.kernel.decompressed
And now you have the decompressed kernel for the device ready for exploration, which is also attached to this post.
Note:
I've tried using different scripts that do the job, including galaxys2_kernel_repack and http://forum.xda-developers.com/showthread.php?t=901152 but both failed while extracting the kernel image, although were able to extract the begin position for the LZO compression header.
Click to expand...
Click to collapse
I tried that and was given a warning of trailing bytes by `lzop`. Later when i do a `file` command on the resulting uncompressed file, it is not a vmlinux ELF image, rather it is a data file. How are we able to repack this image back into zImage? Any advise is appreciated thanks.
What i do if i have boot.img-kernel and boot.img-kernel_offset?
DGKG said:
What i do if i have boot.img-kernel and boot.img-kernel_offset?
Click to expand...
Click to collapse
The boot.img-kernel is your zimage file
What Source you used for Unpack?
Can you share link for you Scripts? or can you provide link to scripts for unpacking and repacking Note 9 Exynos Kernel?
Thanks
Hi All,
I am working on MotoX kernel(3.4.42) , after compilation of kernel source code i am able to generate zImage. I have written zImage to original boot.img using following command
$ abootimg -u boot.img -k zImage
with this boot.img(with custom zImage) I flashed using following command
$fastboot flash boot boot.img
After booting my MotoX phone , my touch screen is not responding. I observed touch screen I2c driver is not initilized because device tree image(dt.img) is not loading by zImage during booting .
Can any one please help how to create dt.img with compiled dtb files and flash in to device???????
Thanks
Ram
516
Any one any help???????
ram1443 said:
Any one any help???????
Click to expand...
Click to collapse
im really surprised you expected most people to know the answer to your question. anyways you can rip t he prebuilt dtb from you stock boot.img using these tools right here : https://github.com/xiaolu/mkbootimg_tools and then use them to repack your zimage. abootimg isnt useful in its current form it seems.
if you wish to compile the dts files into dtb ones youll need to run a script on them, here is teh guide that taught me how to http://www.wiki.xilinx.com/Build+Device+Tree+Blob
shabbypenguin said:
im really surprised you expected most people to know the answer to your question. anyways you can rip t he prebuilt dtb from you stock boot.img using these tools right here : https://github.com/xiaolu/mkbootimg_tools and then use them to repack your zimage. abootimg isnt useful in its current form it seems.
if you wish to compile the dts files into dtb ones youll need to run a script on them, here is teh guide that taught me how to http://www.wiki.xilinx.com/Build+Device+Tree+Blob
Click to expand...
Click to collapse
Hi shabbypenguin,
Thanks for your help,
Now i am able to boot with my custom zImage and default dt.img afeter following above links. but i am unable to generate custom dt.img from my compiled dtb files.
To generate dt.img i am doing below steps:
COMMAND:
-------------
$ ./dtbTool -s 2048 -o ./dt.img -p ../../source/kernel_kitkat/out/target/product/generic/obj/kernel/scripts/dtc/ ../../source/kernel_kitkat/out/target/product/generic/obj/kernel/arch/arm/boot/
OUTPUT :
-----------
Input directory: '../../source/kernel_kitkat/out/target/product/generic/obj/kernel/arch/arm/boot/'
Output file: 'dt.img'
Found file: msm8960ab-ultra-maxx-p1.dtb ... skip, failed to scan for 'qcom,msm-id = <' tag
Found file: msm8960ab-ultram-p3.dtb ... skip, failed to scan for 'qcom,msm-id = <' tag
=> Found 0 unique DTB(s)
Can you please guide me how to generate dt.img from compiled dtb files??
Thanks
Ram
Hello mates!
I've been playing with XT1097's boot.img and need some help as my boot.img fails to boot if I repack ramdisk.
Using abootimg
Extracting boot.img contents:
Code:
abootimg -x boot.img ==> produces bootimg.cfg, initrd.img and zImage files in the current directory
Updating boot.img contents without touching ramdisk (using the one extracted in the previous step):
Code:
abootimg -u boot.img -r initrd.img
If I extract initrd.img and try to repack it, then system fails at boot:
Extracting ramdisk (initrd.img) contents:
Code:
abootimg-unpack-initrd ==> produces a ramdisk subdir
Repacking without modyfing ramdisk folder contents:
Code:
abootimg-pack-initrd newramdisk.img
Updating boot.img with newramdisk.img
Code:
abootimg -u boot.img -r newramdisk.img
Even though the generated boot.img's size matches the original one - 10444800 bytes - system gets stuck at boot logo.
The same issue happens if I use these tools combined:
mkbootimg, unmkbootimg, gzip and cpio
Any ideas are welcome
I tried to root android in AVD Emulator.
Google APIs 27 x86 Revision 8
MagiskManager 7.1.1
My attempt:
1. Make a boot.img with kernel and ramdisk.img in system-images:
Code:
mkbootimg --kernel kernel-ranchu --ramdisk ramdisk.img -o boot.img
2. Patch boot.img in MagiskManager;
3. Separate ramdisk.img from patched boot.img:
Code:
split_boot patched_boot.img
4. Replace the ramdisk.img.
But this won't work, the MagiskManager show Magisk is not installed.
I need to do what else?
@goddade
You can try this https://github.com/shakalaca/MagiskOnEmulator
HemanthJabalpuri said:
@goddade
You can try this https://github.com/shakalaca/MagiskOnEmulator
Click to expand...
Click to collapse
Thank you for your reply.