Tagged Questions

The kernel is a central component of most computer operating systems. It acts as bridge between applications and the hardware and also manages the systems's resources.

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0answers
60 views

What exactly happen when flashing new rom?

I searched for a while without any satisfactory answer. What exactly happen when you flash a new rom on an Android device? What the new rom contains of the Android architecture here: A rom (es: ...
3
votes
1answer
385 views

Low level Android kernel hacking

Where can I find information regarding low level kernel hacking on Android? For example, I'd like to know how the device boots and follow the execution path from that point. Where exactly is the code ...
0
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0answers
142 views

Are all the cores online at a time when In-kernel Cluster switching CPUFReq driver is in use in SAMSUNG S4 GT-I9500?

I checked the file /dev/bL_status in Samsung S4-GT-I9500 (exynos 5410 Octa version) root@android:/dev # cat bL_status 0 1 2 3 L2 CCI [A15] 0 0 0 0 0 [A7] 1 0 0 0 1 and it says that ...
3
votes
1answer
2k views

Does CyanogenMod include a kernel?

I've installed CyanogenMod 10.1 stable for S III LTE (i9305), and noticed that my kernel version is 3.0.64 (I expected it to be 3.4 or something higher). As I've said in this question, the kernel I ...
0
votes
0answers
754 views

How to debug “wlan_wake kernel wakelock” on an unrooted device?

The question is as short as the title. I've a Samsung Galaxy Note 3 & it has started showing issues where the CPU remains in lowest possible frequency (250Mhz) and it doesn't go to deep sleep. I ...
0
votes
1answer
158 views

How to upgrade Avatar ROM's old kernel?

I've got an S3 LTE version (GT I9305), with CyanogenMod (Avatar) installed. I've tried nightlies too, however, I'm still running Linux 3.0 (shown in about in settings). And I've seen CM screenshots ...
0
votes
0answers
1k views

internal sd storage partition/mount problem

I got my nexus 7 2013 a few weeks ago. It worked great for some time until I decided to flash a kernel that claimed to add support for CIFS windows shares mount. After installing this kernel, when the ...
0
votes
1answer
99 views

Relation between Linux and Android kernel versions [duplicate]

I know Android is a modified linux kernel, but does that mean there is any relation between the kernel numbers? In other words, Is kernel number (for example) 2.6.xx of Android somehow based on or ...
0
votes
1answer
336 views

where does default setting for Command Line Switches is set in kernel source code in android

My android device is quad-core . But during booting only 2 cores are up . CPU_HOTPLUG is enabled . In dumpstate i found : maxcpus=2 in command Line options. I wanted to make this maxcpus=4 . I have ...
0
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0answers
830 views

What are the differences between Perseus and Adam kernels

I have a Galaxy S4 i9500 and have started looking into Android development and custom ROMS to get a feel on how they are made, what changes they provide and to what they focus on. But I always end up ...
0
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0answers
103 views

Touchpad buttons do not respond after flashing Kernel

I flashed a new ROM and Kernel on my Galaxy Player 5.0 USA version (YP-G70). I since then tried several kernels and the capacitive buttons (Menu/Home/Back - no physical buttons - just part of the ...
1
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1answer
1k views

What is the default Kernel Governor in Stock Samsung Galaxy Mega Android ROM?

I have rooted my phone recently and just installed ROM Toolbox which has several Governors available. It is using OnDemand by default, but I switched to Interactive. I just need to be as close to ...
0
votes
1answer
195 views

boot.img doesn't contain source code

I have a MTK soc phone rocking JB 4.2.2 with kernel 3.4.0. I have extracted the boot.img in Ubuntu using dsixda kitchen, however the extracted boot.img folder doesn't contain C source code. I have ...
0
votes
1answer
4k views

Signature verification failed when flashing custom kernel (Siyah)

I am trying to flash a custom kernel (Siyah-s2-v6.0b5-CWM) to my Samsung Galaxy S2. When I go to recovery mode, click apply update from sdcard, and select the file, it shows this: Finding update ...
0
votes
0answers
261 views

One S reboots with new CM 3.4 Kernel

This is something that's been bugging me ever since the 3.4 kernel was released: Problem: I am getting intermittent reboots when using any ROM which is based on the 3.4 kernel. It happens totally at ...
3
votes
1answer
2k views

Where can I configure SELinux in Cyanogenmod 10.1.3?

Cyanogenmod released the stable version 10.1.3 yesterday and it apparently includes SELinux enhancements running in permissive mode per default. I thought that you could change the mode in the ...
2
votes
0answers
209 views

How CF-Autoroot works?

How CF-autoroot Theoretically is able to root android devices ? I'm wondering on what technics it use to run su ? Do it use a custom/patched Linux kernel ? or it is based on local root exploit ? I ...
3
votes
2answers
509 views

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

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 ...
2
votes
1answer
715 views

Android early boot console over usb

I'm trying to port newer kernel versions onto my Nexus S device. Most newer kernels panic very early on in the boot process. I would like to debug this. However, since the phone has been provided to ...
1
vote
1answer
839 views

Is is possible to install a new CM version and a custom kernel in one go?

Currently my workflow to update to a new CM nightly and reinstall my custom kernel is this: Install the CM update using the CM updater Boot into recovery manually and install the zip file containing ...
1
vote
1answer
6k views

Which Android runs which Linux kernel?

Is there a list of which kernel version comes in each Android AOSP version? Or lets say, which version /proc/version would spit out.
2
votes
3answers
20k views

Where can I find the stock kernel for my Samsung Galaxy S2?

I have a Samsung Galaxy S2 phone (GT-I9100). I installed clockworkmod, a custom kernel and rom (Resurrection Remix) earlier this year. One day I couldn't boot it anymore. I restored a backup of the ...
0
votes
1answer
2k views

Samsung Note 10.1 USB Ethernet

I'm trying to get USB Ethernet support on my tablet, which for some reason is apparently disabled even though 4.1.2 directly supports it. (My Note II can use it...) I've come to the conclusion that ...
2
votes
1answer
485 views

Does Android 2 support swap space?

With Android 2.3 being Linux-based, can Android 2.3 use a swap partition without being rooted?
5
votes
2answers
2k views

What is the difference between the Linux Kernel and the Android Kernel?

What are the modifications done in linux kernel to make it an android kernel ? By this question I mean what are the differences between linux kernel and android kernel ?
4
votes
1answer
11k views

How can I update the Linux kernel of my Android device?

I am using Sony Xperia E Dual with the kernel that identifies as 3.0.8-perf administrator@ubuntu-scm01 #1 and now I want to update it to the latest and the best one. Please help me understand it can ...
2
votes
1answer
3k views

Why is EXT3 not supported on Android?

Android uses the Linux kernel instead of some "Android kernel", so why is ext3 not supported on Android 2.3?
0
votes
0answers
97 views

Sound on Power-On

I want a sound to be played when the user presses the power button, Since I am customizing Android for Visually Challenged people this feature might let them know if the tablet has actually powered on ...
1
vote
0answers
471 views

Updating Siyah Kernel to 1.9.1 on Galxy SIII i9300 ends in black screen after Siyah logo

I currently run Siyah 1.8.9 Kernel with CM 10.1 nightly (20130218), and I've tried to flash Siyah 1.9.1 with both Odin (PC) and through CM recovery. Both ways end up with a black screen after the ...
1
vote
0answers
356 views

How to find PHYS_OFFSET value for mkbootimg

As i was following instructions here. I found a problem that my /proc/config.gz does not contain CONFIG_PHYS_OFFSET setting. But my /proc/iomem contains 40000000-5bffffff : System RAM. What value i ...
-1
votes
1answer
609 views

What is the method to debug Android kernel from booting in tablet?

I have to test a custom Android build on a tablet and I need to know the method to debug the Android kernel from booting in the tablet? The tablet has only a screen, 2 USB ports and an HDMI port.
-1
votes
1answer
286 views

get wireless tools in Android devices?

i see this link about enable wireless tools on android. but i can't understand the way he follow to enable tools on what terminal or adb shells for the device or on linux platform !! also from ...
0
votes
1answer
69 views

LorDModUE - How to configure

I have installed Lordmodue* to under volt my android device by downloading the .zip, booting into recovery mode, browsing the sdcard and selecting the .zip file. The install was successful and under ...
0
votes
1answer
457 views

Which custom or official kernel should I use on SGS2?

I'm using SGS2 with latest stock ICS ROM, but it has few bugs which I really hate, so I want to look at custom kernels which could help me in this. The main headache for me at the moment is I ...
-1
votes
1answer
234 views

Samsung S2 kernel change

On my Samsung Galaxy S2, I have Android 4.0.4 running with Kernel 3.0.15-1114882. I need to change to kernel 3.015-1157945 or 3.015-1056084 . Is this possible? If yes How?
4
votes
2answers
510 views

Why are some files under /proc are universally readable?

Why are some files under /proc are universally readable by anyone using adb? e.g. /proc/<pid>/statm /proc/<pid>/maps /proc/<pid>/smaps We can even cat the content of these files, ...
2
votes
2answers
275 views

My phone reboots after a kernel oops, what can I do?

I use the CyanogenMod firmware on my phone (CM7.2 on a HTC Wildfire) and when I take photos it sometimes reboots. I found out that a kernel oops happens due to a null pointer dereference in the ...
1
vote
0answers
267 views

Where to find the Kernel Source code for my Samsung Epic 4g device? [closed]

I'm trying to recompile a module for my Android device (I'm pretty new to both kernel level stuff and android stuff) I have an Epic 4G CM9 with a Kernel 2.6.35.7-g502e35e, pinky-ghost@cyyanogenmod#1 ...
3
votes
0answers
3k views

How to change the display refresh rate of an android device

I am creating a custom ROM for my android device (MT6577 + ICS 4.0.4).The base ROM I'm using is the stock ROM of the device. My device's display refresh rate is pre-configured at 30Hz. Now, I want to ...
0
votes
1answer
2k views

How to get setting information before booting Android devices like in BIOS?

Is there any method by which we could get the system information before booting android OS. Like wise in PC/laptop, we can get into BIOS setting before booting and get the system information. Do ...
1
vote
0answers
188 views

Upgrading Kernel

I am somehow confused about the kernel and how it plays out. I have a couple of questions: Let's assume my device kernel reports its kernel as 3.0.8 (using uname -r). How can I figure out what ...
3
votes
1answer
2k views

My Huawei u8160(Vodafone 858) supports usb-host although not working?

I have a Huawei u8160 running Psyke83's Cyanogenmod 7.2 14/8/2012 which had a package with it to apply usb-host mode kernel called usbhost1-cm-7-20120814-MADTEAM-u8160.zip. So I flashed the zip using ...
5
votes
2answers
5k views

Custom Kernels on Stock ROMs?

The General Question: Is it possible to install custom kernels on a Rooted Stock ROM? The Example: I have a Nexus 7 which I have rooted running 4.1.1 (Jelly Bean JRO03D) would it be possible to just ...
7
votes
2answers
833 views

Faster CPU means higher battery consumption?

A friend of mine and I have the Samsung Galaxy Tab 10.1. His tab is flashed with a custom kernel giving 1.2Ghz instead of the 1Ghz I have by default. Using antutu benchmark, we saw what we expected, ...
7
votes
1answer
5k views

l2_hsic prevents my device from Deep Sleep. How to fix it?

I have installed BetterBatteryStats and CPU SPY, because I noticed that I had a faster than normal battery consumption when the tab was left alone. I made a 30 mins test Wifi OFF, Flight Mode On, ...
3
votes
3answers
8k views

Get root or re-install the OS without a USB cable?

Usually, the guides for getting root or re-installing the OS on an Android device (I have a Samsung Galaxy S, which I'm mostly inetersted about) tell to flash the device from another computer through ...
9
votes
5answers
8k views

Why are there so many different Android kernels (technical answer please)

Isn't Android a common kernel that is used across all devices? For example CentOS will install on Dell, HP, and a variety of other hardware. Sure there are different modules but it's still CentOS ...
1
vote
1answer
808 views

Is the kernel flashed automatically from CWM?

By this, I mean, while flashing a firmware (update.zip) from ClockworkMod recovery, is boot.img also flashed or do I need to use fastboot separately?
4
votes
2answers
8k views

Extract boot.img

I have pulled boot.img from my phone's CWM backup. How do I extract it? I tried split_bootimg.pl. But throws an error - Android Magic not found in boot.img. Giving up.
3
votes
4answers
24k views

How to find out if my Device's Kernel has Loop Device Support

I would assume most all of you know why I am asking this, but for those who don't, Loop Device Support of a Kernel on an Android device is utilized to mount a Linux Distro IMG file (Ubuntu or Debian, ...