General :: How To Interrupt Android Boot Sequence To Force It Boot To Linux Kernel Only

Sep 12, 2013

I am trying to do some low level performance testing related to device processor cores through adb which I feel it is affected by Android background services and system stuff.

As I know that the Android boot sequence stages are as follow:

1.Execute Boot ROM code.
2.Execute the boot loader.
3.Load the Linux kernel.
4.Launch Zygote, which initializes the Dalvik VM.
5.System server which loads the Android system.

So my question is how can I interrupt this sequence to force it stop on stage 3 to load Linux kernel. This can implement my intermediary performance testings before loading again Android system.

Does Fastboot or Clockworkmod recovery can load my device to a kind of Linux kernel?

General :: How to interrupt Android boot sequence to force it boot to Linux kernel only


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General :: Android Boot Sequence And Backup / Access To Boot / Recovery Partitions?

Oct 4, 2012

I try to understand android boot sequence on my JB (under CM10). I found some docs and there should be specific partitions (boot, recovery, system, cache, data).

My understanding of the boot sequence is now:

A) normal boot:
1) Power ON ->
2) bootloader ->
3) boot-partition where i flashed the kernel aka boot.img ->
4a) system-partition with the OS (libs, UI, etc) where i unpacked over CWM my customROM.zip ->
4b) data-partition, where i unpacked google-apps.zip and installed all the apps ->
4c) cache-partition with user data

B) recovery boot (adb reboot recovery):
1) Power ON ->
2) bootloader ->
3) recovery-partition with CWM where i may unpack all the .zip stuff to proper partitions, or restore from sdcard, etc.

Is this correct? I wonder, because i didn't installed CWM into recovery-partition. It cames from install of CM10 (fastboot -i 0xfce flash boot boot.img), so it must be in boot-partition and not in recovery?

So, next confusion: i looked up to /proc/mtd and i don't see neither boot nor recovery partition here:

Quote:

# cat /proc/mtd
dev: size erasesize name
mtd0: 19000000 00040000 "system"
mtd1: 00600000 00040000 "appslog"
mtd2: 06580000 00040000 "cache"
mtd3: 1a400000 00040000 "userdata"

I did a backup with CWM and loocked the data. There aren't boot, and recovery backups:

Quote:

# ls -lha /sdcard/clockworkmod/backup/2012-10-04.18.49.55/
d---rwxr-x 2 system sdcard_r 4.0K Oct 4 18:56 .
d---rwxr-x 3 system sdcard_r 4.0K Oct 4 18:49 ..
----rwxr-x 1 system sdcard_r 1.6K Oct 4 18:54 .android_secure.vfat.dup
----rwxr-x 1 system sdcard_r 54.6M Oct 4 18:55 cache.yaffs2.img
----rwxr-x 1 system sdcard_r 360.2M Oct 4 18:53 data.yaffs2.img
----rwxr-x 1 system sdcard_r 212 Oct 4 18:56 nandroid.md5
----rwxr-x 1 system sdcard_r 214.6M Oct 4 18:51 system.yaffs2.img
#

So, i think i didn't understand the boot sequence and partition schema corectly.

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General :: Can Android Boot Logo Screen Be Configured To Show Linux Boot Logging

Jun 13, 2012

Instead of seeing the boring old Android logo or my service provider's logo, I'd love to see the standard text-based Linux boot screen that shows the status of all the hardware and configuration info as my phone boots. My current phone is an HTC EVO 3D running Cool ICS with Sense 3.6 and Revolutionary CWM.

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HTC Explorer A310e

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Apr 19, 2012

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General :: Why Won't Allwinner A10 Kernel Boot

Jun 26, 2013

I am trying to use my cheap virtually unbrickable tablet to learn more about kernel development and eventually ROM building.

I have extracted the manufacturers (WoPad) LiveSuit image and used split_bootimg.pl to break up the boot image.

I extracted the config file from the kernel image using extract-ikconfig and it created a config file. I didn't see the config in /proc.

So, I have the factory ramdisk and the factory kernel config.

I have downloaded several kernel sources (lichee-3.0.8, ChritianTroy's 3.0.36, and another one from linux-sunxi 3.0.72). I can successfully compile all of them without errors and they all generate zImages, uImages, etc using the factory config as well as the sun4i_crane configs they come with.

When I repack the boot.img with the newly created kernel and install it on nandc it wont' boot past the android icon (u-boot). When I compare my boot.img to the factory one, they both have the same offset where the kernel starts (0x00000800). I have also ensured I'm replacing the kernel modules when I'm changing kernel versions.

Here is the line I'm using to repack the boot.img

Code:
mkbootimg --base 0x40000000 --pagesize 2048 --kernel zImage --ramdisk ramdisk-repack.cpio.gz --board sun4i --cmdline "console=ttyS0,115200 rw init=/init loglevel=8" -o boot.img

[Code]...

Also, I'm building on Ubuntu 13.04 with Google GCC 4.6 from the ndk. I have built kernels for other devices without issues.

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Aug 29, 2013

How to change the kernel boot logo on my samsung kernel? I don't mean the boot animation. I may have built a ROM but the kernel used there doesn't belong to me.

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General :: Porting A Kernel That Hangs At Boot

Feb 1, 2014

I am trying to port a kernel from one zte 8960 to another. I have cwm recover set up with kexec to get a log of what is going on. the kernel hangs at boot of the phone so I trying to find the cause

-last_kmsg after a failed boot of 3.4

pastebin.com/0AGpACsT

-last_kmsg after a boot of 3.0.8

pastebin.com/N3WtDHwC

-split-boot of boot.img

Code:
output directory: fi
boot_magic correct: ANDROID!
kernel size: 6045264
kernel address: 2149613568
Base: 2149580800 (hex): 0x80200000
[code]....

I am thinking it might had hit "un-allocated" memory area, I did have to change the ramdisk_offset from 0x01300000 to 0x02000000 make the kernel fit. what could I do to check to see if it is un-allocated space I am dealing with

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General :: Xperia Arc S Won't Boot Up After Installing Kernel

Dec 1, 2013

my device : xperia arc s

im new in android and a couple hours ago i try to instal beanstalk - legacy kitkat 4.4 and they suggest to download kernel from dark raven "dark kernel cm11.0" 11DarkUrushi20131130 after that im flash the kernel and something happen....

my phone dont boot up and the logo dont appear

im try to connect to flash tool but still dont get it...

nb : for guarantee already pass 3 month ago....

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Jan 25, 2014

Is there any way to change my kernel's boot logo / animation ?

E10i

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Recently I flashed A Kernel By Mb-14 on my Galaxy Ace Plus.....It Changed my Boot Logo.....i Want my Original Bootlogo back...

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Jul 4, 2012

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Credit to Daali at MyDroidWorld
http://www.mydroidworld.com/forums/droid-x-themes/5361-d-amn-small-linux-bootanimation-droid-x.html

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huawei u8860:

i compiled a kernel from the sources kernel-3.0.8-U8860-IcecreamSandwich.tar.gz .

on virtual box ubuntu 10.04 (oracle java 1.6.0u33 )with

Code:
gcc -v
x86_64-linux-gnu
gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1)[code]......

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Dec 3, 2009

Unfortunately, I've had to uninstall several apps that I liked because they force start on boot and my Droid was becoming completely laggy because of too many apps starting on boot. I understand that some apps/widgets need to start on boot, but others its completely unnecessary. At a minimum, make an option in settings to let the user decide if we want it to start on boot up.

I just uninstalled Note Everything, Estrong File manager and Weatherbug because they were starting on boot. I love MixZing and I am kind of annoyed that it starts on boot, but its an app I "need" so I can't uninstall it. I'll probably email all these devs and ask about giving the option not to start on boot.

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Feb 21, 2013

I have a phone with a MT6577. The vendor (Wiko) published the kernel source code. So, i'm trying to build it. I can get the zImage. I converted it to boot.img but i can't boot with it on my phone.build a good zImage? (if you want to try) : URL...

cp mediatek-configs .config
TARGET_PRODUCT=s9081 MTK_ROOT_CUSTOM=../mediatek/custom make
# sudo mtk-tools/repack-MT65xx.pl -boot zImage boot.img-ramdisk boot.img
MTK-Tools by Bruno MartinsMT65xx repack script (last update: 27-01-2013)
Repacking boot image...
Ramdisk size: 2046 blocs
Repacked boot image into 'boot.img'.

Here are the Warnings I got when compiling

mediatek/platform/mt6577/kernel/drivers/video/tvc_drv.c:61:5: warning: "FIXED_WVGA_PARAMS" is not defined
net/ipv4/tcp.c: In function 'tcp_nuke_addr':
include/net/ipv6.h:338: warning: 'in6' may be used uninitialized in this function
net/ipv4/tcp.c:3367: note: 'in6' was declared here
In file included from net/ipv4/netfilter/ipt_LOG.c:27:
include/net/netfilter/xt_log.h: In function 'sb_close':
[code]....

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Oct 12, 2010

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Oct 24, 2009

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Oct 30, 2010

I went to reboot my Droid because it was lagging a little and when it came back on it go stuck at the Cyanogen boot screen. I pulled the battery, put it back in and held the X to boot in recovery and my recovery won't come up either. It just skips right to the Motorola M and if it doesn't get stuck there it goes back to the Cyanogen screen.

I haven't made any changes to the phone at all so I am completely puzzled on why this is happening. I obviously can't take it back to Verizon since its rooted so if there is a way to fix this I really want to because I love my phone and my wife will kill me if it is screwed up.

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Jul 14, 2010

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How to build latest linux kernel from off site for Android device (for example Nexus7)?

I have: AOSP source code

Android build for device (from aosp)
Downloaded kernel 3.8.4 from off site

The question is: How can I build latest kernel using all described stuff (aosp source, kernel config, latest kernel)?

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Sep 16, 2010

I tried installing Tranquility and must have screwed something up because now my phone won't boot past the Motorola Logo. It's been sitting here like this for about 15min and I can't even boot into recovery by holding the power and home buttons. I don't know what else to do now. Idk if my phone is bricked but even if it is don't I need the SBF file to unbrick it and I can't find that file any where. I did a nand backup or whatever before doing any of this so hopefully that can help me. What should I do now?

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Oct 13, 2010

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Is it Goodle's business model (spyware by any other name?) clashes with the ethics of the open source community?

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i want to add some features to linux kernel to run on my mobile (android based mobile perhaps). but i don't know who let me to upload my custom kernel. i want to buy such mobile phone. some restrictions about uploading custom kernel to phone:

1- replace existing kernel.
2- can use my phones functionalities: it is due to some drivers are closed source and i must use the vendor's kernel to use it's drivers.

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