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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softbricked sgh-i337 at&t with 4.4.2 ota update

I have a sgh-i337 at&t usa GPe recently updated OTA, I tried to format my rom so I could patch my kernel and threw everything at it but the kitchen sink to clear the memory but could not get it ...
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17 views

looking for a kernel hack

I have am Samsung g4 with borked code and for forensics and repair reasons, I need to extract/pull a copy of the running kernel from the /boot sector which is only accessible via Odin. I have the ...
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1answer
24 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
30 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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1answer
39 views
+50

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
25 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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1answer
53 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
43 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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26 views

How to mount ubifs filesystem on android emulator?

I want to test the functionality of a custom ubifs filesystem on an android emulator (avd- Nexus 5). I have compiled and deployed a goldfish kernel(3.4) with ubifs support. But not finding the correct ...
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18 views

unable to export a gpiokey in /sys/class/gpio using Android kernel

I tried echo 36 >/sys/class/gpio/export. I am looking to read the activelow value for my gpio pin. Instead of getting gpio32 dirctory I am getting gpiochip32. All the gpio related /sys entry ...
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1answer
37 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
26 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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13 views

Change default Hotspot IPAddress (192.168.43.1) or mac address [duplicate]

I have some 20 android devices. It seems all have the same IPaddress(192.168.43.1) and mac address(XX.XX.XX.XX.XX.XX). I have a problem. when I am switching hotspot of any device. And I am ...
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1answer
50 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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0answers
30 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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1answer
17 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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0answers
81 views

What is “Additional Safe RAM” (ASRAM) and how do I enable it?

What is Additional safe RAM? How can I enable this in my custom ROM? I am using AOSP KK version Linux Android Kernel. Any reference code for ASRAM would be greatly appreciated.
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1answer
112 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
40 views

Reason behind issues in FairPhone OS 1.1 [closed]

The current version 1.1 of the Android shipped with FairPhones had some issues which should be fixed with the upcomming version 1.2. The two major ones are Camera apps (default and others) showing ...
2
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1answer
142 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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0answers
1k 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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79 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
64 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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82 views

What really needs to be wiped before flashing rom or kernel?

Wiping Questions Does wiping cache wipe dalvik cache? What to do with dalvik cache in recovery when flashing when I changed the default from Dalvik to ART? When I flash kernel what partitions to ...
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123 views

Silent failure when connecting to VPN on HTC One Kitkat

I'm not sure exactly when this happens (since I normally use another phone for VPN work), but on my HTC One, updated to 4.4.2, connecting to VPN fails silently : the built-in VPN client, tested with ...
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1answer
301 views

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
4k 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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340 views

MpDecision - cpu power consumption

I have a customize rom. With battery drain, about 3 times vannila/stock rom. with gapps, wifi off. proc/uptime show same wake time as stock/vannila for the same scenario possibilities of battery ...
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2answers
372 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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38 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
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1answer
196 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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129 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 ...
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0answers
1k 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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0answers
573 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
147 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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0answers
951 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
79 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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1answer
252 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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733 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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82 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
771 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 ...
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1answer
139 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
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1answer
3k 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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105 views

installion of CWM/TWRP added kernel

I have installed a MIUI ROM in my LT18i. The first step was installing a CWM/TWRP kernel which came along with the ROM package. Now, I want to install cyanogenmod custom ROM. This custom ROM guide ...
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240 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 ...
2
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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
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0answers
165 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 ...
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2answers
410 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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0answers
94 views

ACPUCLOCK and Overclocking

I have an HTC One with ElementalX kernel. I have overclocked it to 2.1GHz using SetCPU, but is the phone actually running at 2.1GHz? Someone told me Qualcomm has been locking SCPLL since the 8x60 ...
2
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1answer
536 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 ...