I used rotohammer's method for backing up the AT&T Galaxy Tab and it worked wonderfully. I compiled the GT-P1000_Kernel patched with SGH-I987_Kernel and did a standard make and then flashed the zImage onto the galaxy. It resulted in kernel panic. Does anyone know what parameters to use with make or configuration changes that need to be made?
Thanks
ps. when I used heimdall, I only "heimdall flash --kernel zImage".
I also couldn't find a config.gz in the /proc dir. Does anybody know why it is missing and what has taken its place?
success at last
Yay, it works now! thanks roto for the initramfs tip.
what kind of modification did u make to the kernel? do you mind sharing?
[Q] how did you compile your own kernel?
Hi,
I'm in disperate need to do this. I have downloaded the sources from samsung opensource -> followed the instruction in the README.txt -> compiled the kernel and the modules successfully -> used the initramfs from the stock zImage -> but when I flash the zImage (Size ~ 432 KB) I get kernel panic.
I do not think it is possible to boot in verbose mode or have a serial port console log.
letolkki: please share with us how you did it? how did you compile a zImage which boots.??????
share with us please!
I used make menuconfig to specify the location of the initramfs (compression to none). Do not use the build script above the root as that seemed to mess things up for me. The size of my kernel is approx ~5meg with the initramfs included and ~3 without. Then used Heimdall to push it on.
I didn't make any mods as of yet. Just a quest for knowledge and tinkering. Just making sure I can when I need to.
What exactly did you modify? Here's my config, as related to INITRAMFS:
CONFIG_BLK_DEV_INITRD=y
CONFIG_INITRAMFS_SOURCE=""
CONFIG_RD_GZIP=y
CONFIG_RD_BZIP2=y
CONFIG_RD_LZMA=y
CONFIG_INITRAMFS_COMPRESSION_NONE=y
# CONFIG_INITRAMFS_COMPRESSION_GZIP is not set
# CONFIG_INITRAMFS_COMPRESSION_BZIP2 is not set
# CONFIG_INITRAMFS_COMPRESSION_LZMA is not set
CONFIG_CC_OPTIMIZE_FOR_SIZE=y
My kernel size is only 2.9 megs. What else did you specify that has your kernel at 5 megs?
Thanks
you don't have the initramfs source file specified. Put the complete path to the initramfs in the config.
Even when I specified the file location generated during the compile, it still didn't work...size only 3 meg. Are you using the ramdisk.img generated and output into Android/out/target/product/...? Or, did you pull boot.img from the device and split ramdisk.img from the kernel?
chuckbeasley said:
Even when I specified the file location generated during the compile, it still didn't work...size only 3 meg. Are you using the ramdisk.img generated and output into Android/out/target/product/...? Or, did you pull boot.img from the device and split ramdisk.img from the kernel?
Click to expand...
Click to collapse
yep, i pulled it from the device
Would you please tell me how you did it exactly? I've been attempting over the past several hours and haven't been able to find a tool that would split boot.img. They keep telling me that it's not a valid image, but I pulled it from the device.
chuckbeasley said:
Would you please tell me how you did it exactly? I've been attempting over the past several hours and haven't been able to find a tool that would split boot.img. They keep telling me that it's not a valid image, but I pulled it from the device.
Click to expand...
Click to collapse
I used the script from
http://forum.xda-developers.com/wiki/index.php?title=Extract_initramfs_from_zImage
to get the initramfs from the zImage pulled from the device.
Much appreciated! I'll try this later tonight. Right now, I need a break...
I used verizon_zImage from ClockworkMod, but it fails the extraction with a gzip invalid compressed data--format violated error. How can I pull the zImage directly from the phone? It seems that boot.img doesn't work either.
Thanks
Here are the error messages I'm receiving for both verizon_zImage and boot.img, which I pulled from the GT:
[email protected]:~/ramdisk$ ./extract_initramfs verizon_zImage
-I- Extracting kernel image from verizon_zImage (start = 13117)
gzip: stdin: decompression OK, trailing garbage ignored
5979431+0 records in
5979431+0 records out
5979431 bytes (6.0 MB) copied, 195.453 s, 30.6 kB/s
-I- Extracting compressed cpio image from kernel image (start = 5410216)
gzip: stdin: invalid compressed data--format violated
-I- Extracting initramfs image from /tmp/cpio.img (start = , end = 11)
dd: invalid number `'
[email protected]:~/ramdisk$ ./extract_initramfs boot.img
-I- Extracting kernel image from boot.img (start = 13117)
gzip: stdin: decompression OK, trailing garbage ignored
-I- Extracting compressed cpio image from kernel image (start = 5410216)
gzip: stdin: invalid compressed data--format violated
-I- Extracting initramfs image from /tmp/cpio.img (start = , end = 11)
dd: invalid number `'
Looks like the script had a bug and has been updated. Here's the link: http://forum.xda-developers.com/showthread.php?p=8679959
Here's the updated script that allowed me to extract initramfs.cpio from boot.img:
#!/bin/sh
# This is an update version of the script found at
# http://forum.xda-developers.com/wiki/index.php?title=Extract_initramfs_from_zImage
#
# The problem with that script is that the gzip magic number occasionally occur
# naturally, meaning that some non-compressed files get uncompressed.
zImage=$1
#========================================================
# find start of gziped kernel object in the zImage file:
#========================================================
pos=`grep -P -a -b -m 1 --only-matching $'\x1F\x8B\x08' $zImage | cut -f 1 -d :`
echo -n "-I- Extracting kernel image from $zImage (start = $pos)"
dd if=$zImage bs=1 skip=$pos | gunzip > /tmp/kernel.img
#==========================================================================
# find start and end of the "cpio" initramfs image inside the kernel object:
# ASCII cpio header starts with '070701'
# The end of the cpio archive is marked with an empty file named TRAILER!!!
#==========================================================================
start=`grep -a -b -m 1 --only-matching '070701' /tmp/kernel.img | head -1 | cut -f 1 -d :`
end=`grep -a -b -m 1 --only-matching 'TRAILER!!!' /tmp/kernel.img | head -1 | cut -f 1 -d :`
if [ $start = "" || $end = "" ]; then
#========================================================================
# the cpio archive must be archived
#========================================================================
echo "-I- Extracting compressed cpio image from kernel image (start = $pos)"
pos=`grep -P -a -b -m 1 --only-matching $'\x1F\x8B\x08' /tmp/kernel.img | cut -f 1 -d :`
dd if=/tmp/kernel.img bs=1 skip=$pos | gunzip > /tmp/cpio.img
start=`grep -a -b -m 1 --only-matching '070701' /tmp/cpio.img | head -1 | cut -f 1 -d :`
end=`grep -a -b -m 1 --only-matching 'TRAILER!!!' /tmp/cpio.img | head -1 | cut -f 1 -d :`
inputfile=/tmp/cpio.img
else
echo -n "-I- Already uncompressed cpio.img, not decompressing"
inputfile=/tmp/kernel.img
fi
end=$((end + 10))
count=$((end - start))
if (($count < 0)); then
echo "-E- Couldn't match start/end of the initramfs image."
exit
fi
echo "-I- Extracting initramfs image from $inputfile (start = $start, end = $end)"
dd if=$inputfile bs=1 skip=$start count=$count > initramfs.cpio
chuckbeasley said:
I used verizon_zImage from ClockworkMod, but it fails the extraction with a gzip invalid compressed data--format violated error. How can I pull the zImage directly from the phone? It seems that boot.img doesn't work either.
Thanks
Click to expand...
Click to collapse
I used rotohammer's backup method to pull the zImage from the device.
http://forum.xda-developers.com/showthread.php?t=850359&highlight=backup+install+kernel
So do you guys have working kernels ?
I know from my Nexus days that custom kernels can made a massive difference to performance on the beast, so I am looking forward to seeing what people can do with the TAB
Keep up the good work !
I've built my own kernel to see if I could work around the dialing limitation on my VZW tab. Right now, it crashes randomly, but it does boot! I'm looking into the difference between the international version of Onedram and Verizon's version and why Verizon includes a OnedramRecovery unit. My kernel doesn't reference OnedramRecovery and I made more mods. So, I haven't isolated what is causing the instability. Right now, I'm back to Koush's kernel. I'll keep you informed on my progress.
Sent from my SCH-I800 using XDA App
Hello folks, I am using the tytung r9 kernel with Hyperdroid GBX 12 and I want change the default splash image of the kernel. I have already converted the image to .rle thanks to this guide, and I been told I have to unpack the initird, place it on the root of the initrd and pack it back, problem is I don't know how to do it.
Can anyone help me to unpack an pack back the initrd??? Also I couldn't find it on the phone.. Where exactly is it located ???
Thanks
Ok, all the credits goes to @Curious_ from #htc-linux-chat on irc who has kindly helped me to sort this out, and now I want to share it with everyone.
In order to replace the logo.rle image with the one we made we have to mount the /boot partition, so lets begin
Code:
mkdir /data/boot/
mount -t yaffs2 /dev/block/mtdblock2 /data/boot/
now that the /boot partition is mounted we want to pull the initrd.gz file into ur pc
Code:
adb pull /boot/data/initrd.gz /path/to/dir/
now we'r gonna extract the initrd file from initrd.gz and unpack it
Code:
gunzip initrd.gz
cpio -i < initrd
now replace the logo.rle file with our one and lets repack it
Code:
find . | cpio -o -H newc | gzip > initrd.gz
Ok, last step is to push the new initrd.gz file into /data/boot and reboot the phone
Code:
adb push /wherever/it/is/initrd.gz /data/boot/
reboot
Enjoy
In addition here you can find lots of splash screens specifically made for the HD2. Those are not specifically boot splash screen, but you can convert the image to .rle using too565 tool.
Hope you guys will be making lots of custom boot splash screens
Hello to everyone,
I'm trying to boot my Nexus 10 with another kind of kernel version,because I'm not interested to use the Android kernel,but the Ubuntu pure kernel. I've chosen to use the linux-kvm-arm kernel version 3.13 :
These are the commands that I have used :
git clone git://github.com/virtualopensystems/linux-kvm-arm.git
cd linux-kvm-arm
git checkout origin/chromebook-3.13 -b chromebook-3.13
curl http://www.virtualopensystems.com/downloads/guides/kvm_on_chromebook/config > .config
and then I've added these lines to the .config file :
CONFIG_ANDROID=y
CONFIG_ANDROID_BINDER_IPC=y
CONFIG_ASHMEM=y
CONFIG_ANDROID_LOGGER=y
CONFIG_ANDROID_PERSISTENT_RAM=y
CONFIG_ANDROID_RAM_CONSOLE=y
CONFIG_ANDROID_TIMED_OUTPUT=y
CONFIG_ANDROID_TIMED_GPIO is not set
CONFIG_ANDROID_LOW_MEMORY_KILLER=y
CONFIG_ANDROID_SWITCH is not set
CONFIG_ANDROID_INTF_ALARM is not set
CONFIG_FB_TILEBLITTING=y
CONFIG_PHONE is not set
CONFIG_USB_WPAN_HCD is not set
CONFIG_WIMAX_GDM72XX is not set
CONFIG_ARM_PLATFORM_DEVICES=y
CONFIG_ARM_CHROMEOS_FIRMWARE=y
CONFIG_CHROMEOS=y
CONFIG_CHROMEOS_VBC_BLK=y
CONFIG_CHROMEOS_VBC_EC=y
CONFIG_CHROMEOS_RAMOOPS_RAM_START=0x41f00000
CONFIG_CHROMEOS_RAMOOPS_RAM_SIZE=0x00100000
CONFIG_CHROMEOS_RAMOOPS_RECORD_SIZE=0x00020000
CONFIG_CHROMEOS_RAMOOPS_DUMP_OOPS=0x1
CONFIG_CLKDEV_LOOKUP=y
and then I did :
ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make uImage dtbs
from here I've followed the tutorial that I've found here :
http://forum.xda-developers.com/showthread.php?t=1981788
and here :
http://forum.xda-developers.com/showthread.php?t=1981788&page=2
mkdir -p newkernel
cd newkernel
wget -c https://dl.google.com/dl/android/aosp/mantaray-kot49h-factory-174ba74f.tgz
tar xvzf mantaray-kot49h-factory-174ba74f.tgz
cd mantaray-kot49h
unzip image-mantaray-kot49h.zip
wget -c http://android-serialport-api.googlecode.com/files/getramdisk.py
chmod +x getramdisk.py
./getramdisk.py boot.img --> ramdisk.img
wget -c http://android-serialport-api.googlecode.com/files/android_bootimg_tools.tar.gz
tar xvf android_bootimg_tools.tar.gz
./mkbootimg --kernel ../../linux-kvm-arm/arch/arm/boot/zImage --ramdisk ramdisk.img --cmdline bootimg.cfg -o new-boot.img
fastboot flash boot new-boot.img
I think that something is wrong here,because it is not able to boot....I see a black screen and nothing else happens...
Hi,
probably too simple, but:
How does your .config look?
Did the curl actually work? (I ask because I tried your URL and it didn't work for me).
Did you actually compile a guest kernel too and boot it?
Special ChromeOS suupport does not exist in that branch.
Keep up the work, if you succeed booting linux, I got a prize for you.
Don't take it wrong, I'm just too bored of the tablet as it is now.
Wejgomi
Hi
I am used to rebuild boot images with unkmbootimg/mkbootimg on my S4 mini. When I repack a G900F a working stock boot.img and flash it with Odin, the device boots into download mode. I didn't made any changes in the ramfs, the sources are binary the same, but when I repack it to the boot.img it's different to the stock.
Is my bootloader locked? Do I need a special mkbootimg to enable SEAndroid enforcing? It does not matter if I disable it in the ramfs. Do I have to modify the kernel too?
Regards
It seems, that not the boot image is the problem but the cpio initramfs.
I can use the command
Code:
abootimg -u boot.img -r initrd.img
to replace the ramdisk in a working boot image. This works only if a replace the current initramfs with the original initramfs. If I unpack the initramfs too and repack the exact same sources, it won't boot. The sources are binary the same, but the packed initramfs is totally different.
I use the following command to repack my initramfs:
Code:
find . | cpio -o -H newc | gzip > ../initrd.img
cloooned said:
It seems, that not the boot image is the problem but the cpio initramfs.
I can use the command
Code:
abootimg -u boot.img -r initrd.img
to replace the ramdisk in a working boot image. This works only if a replace the current initramfs with the original initramfs. If I unpack the initramfs too and repack the exact same sources, it won't boot. The sources are binary the same, but the packed initramfs is totally different.
I use the following command to repack my initramfs:
Code:
find . | cpio -o -H newc | gzip > ../initrd.img
Click to expand...
Click to collapse
I don't know if this is still relevant to you, but I have found that so far the only tool that repacks s5 kernel properly is the Osm0sis kernel kitchen. I am working on linux and I was able to pack my compiled zimage and modified ramdisk using his tool. You can read more on his original thread here .
I hope thos help you.
Hi,
I have a Meizu Pro 5 Ubuntu Edition, and I try to Compile the Meizu Pro 5 Kernel from here: github.com/meizuosc/m576 using the Compiler from here: android.googlesource.com/platform/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9
I compiled the Kernel using thr following commands:
Code:
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-android- pro5_defconfig
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-android-
It did compile, and I got a arch/arm64/boot/Image
Then, I tried to replace the current kernel on my phone with the new one. I copied the partition bootimg from my Phone using dd, extracted the files zImage, bootimg.cfg and initrd.img using the command "abootimg -x bootimg.img", removed the line "bootsize" from the bootimg.cfg, and created, flashed and started a new bootimg.img using the following commands:
Code:
abootimg --create bootimg.img -f bootimg.cfg -k zImage -r initrd.img
fastboot flash recovery bootimg.img
fastboot oem reboot recovery
However, the Phone just froze on the Meizu splash screen. Am I doing something wrong?
PS: If I recreate the bootimg.img using the original Kernel, the Phone starts normally.