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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Is Android FAT / FAT32 implementation power failure resilient?

Does the android FAT/32 implementation handle sudden battery removal? I know that Symbian's 'Rugged FAT' (efat32.fsy) and Microsoft's T-Fat implement this, but I've not been able to find any ...
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AFwall+: Why does the Kernel need an internet connection all the time?

Since I started using AFWall+ (a firewall based on iptables) on Android, I was wondering why the Linux kernel tries to connect to the internet all the time? Allthough blocking the kernel I didn't ...
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2answers
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does flashing a kernel ever wipe anything on the phone? + Doing it without CWM?

does flashing a kernel ever wipe anything on the phone? and is it ever dependent on android version? e.g. 4.22 or 4.3 I have CWM and i've seen the option to install from zip within CWM recovery. ...
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83 views

Using a wifi dongle to monitor network

I have an android smart box with a built-in wifi and I want to add a dongle to the box so that I can monitor the network. I have found a similar question with somewhat vague answer(at least to me); ...
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1answer
920 views

Programmatically, how does “rooting” a device enable access? [duplicate]

From a layman point of view, one would say, "Oh, I'm unrooted so I am blocked and access is not allowed." I want the programmatic point of view; telling me how an unrooted device doesn't have access ...
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2k views

Network Issue after flashing Cosmic ROM at Galaxy S Duos

I am a Galaxy S DUOS S7562 user and I have flashed Cosmic ROM v2.5 to my phone. However, I face some connectivity problems. My phone is dual sim but now it forever activates and deactivates both sims ...
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328 views

How do you extract the boot.img from a samsung g4?

I don't image the adb command is able to access that sector of the device but for the record, when I connect, I can see the device but C:\Users\Brad2\Downloads\adbUnzip2Cdrive\adb>adb kill-server ...
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1answer
391 views

Where is the .config hidden on Samsung Galaxy S4?

cat /proc/config.gz tmp-mksh: cat: /proc/config.gz: No such file or directory Is there another place to find it?
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286 views

Help to understand working of powerbutton and volume rockers

I want to understand the workings of power button and volume rockers in Android devices, which are associated with the kernel driver of these keys. What happens in the kernel driver and boot loader ...
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1answer
83 views

Proprietary software distributed along with Linux kernel

What is the licensing rationale behind distributing proprietary (copyrighted) software within a common smartphone's Android system? I mean software like device drivers (camera, GSM modules etc.) or ...
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539 views

Confirming the nature of a Samsung update, and declining it

I find it a little bit offensive to receive a "Software Update" message on my Galaxy Note 2 that does not disclose the nature of the update (an OS update? an app update?). software update message ...
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1answer
502 views

Oddities Reading boot.img - Way Too Big and Errors In Kernel

This is related to this question but as I've made some progress since and run into some rather different issues that would mean I'd essentially have to rewrite it to be a totally different question ...
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1answer
428 views

Is it possible to unload built-in kernel module?

I have a kernel with built-in module that I want to replace. I have built a .ko and tried to insmod it, but it failed since the kernel was already built with it. Is it possible to do this?
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1answer
55 views

Replacing the system partition without touching the kernel?

So I have an android phone that I'd like to put a clean rom onto, but it looks like there aren't any good kernels ported to it yet. I've done some reading into the android architecture, and come to ...
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1answer
492 views

How to install custom kernel from source? - Galaxy Tab 2 10.1 (GT-P5113)

I have modified the kernel code in attempts to add a driver for USB to Ethernet. I have successfully compiled the code and am trying to install it onto my tablet. I am following the README that came ...
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1answer
307 views

Where is the current_now measurement generated

If you go into the adb shell, you can check what the amount of current the battery is discharging by using the following command cat /sys/class/power_supply/battery/current_now When the current is ...
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28 views

how can I change the contents of /proc/product_name_extra?

I have a rooted device and need to change the contents of /proc/product_name_extra from Prod to Eng. I have tried cp, mv, echo, and vi. I get IO error most commonly and no matter what perms I set I ...
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1answer
2k views

Cannot find HTC One in ADB, SD card not mounted, incorrect kernel for installed ROM, no backup

Pretty much what the title says. I have messed up big time. Because I am switching carriers, I have to switch back to the stock ROM. It is stuck at the loading screen, most likely because of a kernel ...
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1answer
3k views

How do I find the kernel config for my ROM?

I'm very happy with CM11 ported to my phone(Samsung Galaxy Ace 2). One day I bought Bluetooth keyboard. When I tried to connect it, it paired and... wat? No connection!? I thought that this ROM has ...
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4k views

Nexus 5 takes forever and a day to charge

Since I have installed franco Kernel on my device, charging takes longer than normal (I'd guess 4-5 hours?). But today charging became extremely slow. I plugged it in overnight and this morning it ...
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927 views

Can't mount SMB folders on rooted device

Android 4.3 on a rooted Samsung galaxy note. Astro file manager can work with my network (SMB) folders but the CIFS Manager app says "mount: no such device". (Mount Manager app doesn't seem to support ...
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2answers
677 views

Go back to Stock Kernel

I upgraded to faux kernel not a long time ago and I am having a lot of issues with it. I want to go back to the original kernel. I even tried restoring to factory defaults but it didn't restore the ...
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2answers
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I installed an incompatible kernel with CyanogenMod - what do I do?

I installed Faux kernel on my Nexus 5 with CyanogenMod 11. I forgot about CM's special kernel setup when installing Faux - how do I uninstall, or wipe my phone to reinstall CyanogenMod? I use ...
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2answers
7k views

Nexus 4, ART vs Dalvik Runtime: Which provides a lower battery consumption?

I'm using a Nexus 4 and currently using the Cyanogen Mod 11 ROM. I was using Paranoid Android Beta 4 for KitKat before but switched to Cyanogen Mod due to the stability that Cyanogen Mod offers right ...
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910 views

Given that every application runs as a separate user, what happens when you want to add a new user account?

According to this, every application in Android runs as a separate kernel-level user, with a unique user ID and group ID. So, what happens under the hood when you add a new user (e.g. to your shared ...
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95 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: ...
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678 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 ...
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1answer
3k 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 ...
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1answer
1k 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 ...
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1answer
175 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 ...
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2k 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 ...
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1answer
129 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 ...
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718 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 ...
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1k 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 ...
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149 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 ...
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1answer
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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 ...
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1answer
277 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 ...
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1answer
6k 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 ...
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293 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 ...
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1answer
3k 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 ...
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1answer
417 views

How does CF-Autoroot work?

What's the theory behind how CF-autoroot is able to root android devices? I'm wondering on what techniques it used to run su? Does it use a custom/patched Linux kernel? Or it is based on local root ...
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2answers
694 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 ...
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1answer
1k 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 ...
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1answer
1k 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 ...
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1answer
13k 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.
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3answers
25k 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 ...
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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 ...
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1answer
759 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?
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3k 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 ?
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1answer
16k 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 ...