some of you know me from the Samsung devices area, where I provide my kernels already for more than two years to Galaxy S3 and Note 10.1 users for all sort of platforms (Samsung, Cyanogenmod, Omnirom etc.).
Maybe you also know me from my OnePlus One kernels I added in winter last year to my portfolio.
Finally I got a Samsung Galaxy S5 afew weeks ago and decided to port my kernel also to this device. This is a sponsored device, so I want to say a big thank you to the people that made it possible, namely the ones in the German Smartphone Forum www.hubo.in !!!
I am not heading to have as many features as possible implemented, this is not my design goal. If you are more into that, move on to other, good existing kernels. If you are searching for a good mix of improvements and new functions while not sacrificing stability, you are welcome here (see below the history section for more info).
For the CM Boeffla-Kernel, please go HERE.
When using new anykernel concept Boeffla-Kernel: Flash stock kernel of rom first !
Important: This kernel is only meant to be compatible with official Samsung stock firmware and nothing else.
So when the kernel does not run on custom rom XYZ, do not even bother me with it or ask hundred times in the thread for compatibility.
I could not care less about it !!
First read the FAQ section on the Homepage !!!
Click here to learn about all possible kernel settings in the config app.
Click here to learn about using the config app.
I will refuse to give support if you do any undervolting and experience freezes or hot reboots.
I will also not provide any support if you do not use Boeffla-Config app to tweak the kernel, other 3rd party tweaking apps are known (and intended) to cause issues.
I will refuse to give support if you have xposed framework installed and reporting any kind of weird issues. My opinion to xposed it quite clear: too powerful for >90% of the users that just mess up their system with it.
(you can also access them directly in Boeffla-Config V2 by pressing menu and selecting "change log...")
Change log for Android 5.0 kernels: KLICK HERE
- Support of anykernel concept (only latest kernels) - flash stock kernel before flashing Boeffla
- Full integration with Boeffla-Config V2 configuration app (get it from http://www.boeffla.de) to configure all kernel settings
- Additional governors: zzmoove (Note: not considered stable at the moment, you might face reboots!!!), intelliactive, intellidemand, wheatley, smartmax, slim, intellimm, nightmare, lionheart, pegasusq
- Zzmoove supporting native hotplugging profiles
- Additional schedulers: fiops, bfq, sio, tripndroid, zen
- Many Hotplug tweak profiles (Default, Optimized, 1 core max, 2 cores max, 3 cores max, 2 cores min, 3 cores min, 4 cores min, 2 cores exact, 3 cores exact)
- Wake up gestures implemented (double-tap-to-wake, swipe to wake)
- Boeffla-Sound engine (Headphones and speaker volume configurable)
- Configurable vnswap
- zSwap configured fix to Samsung stock value of 1280 MB
- True dynamic FSync (activated if screen on, deactived if screen off), configurable
- Touch boost frequency configurable, touch boost switch
- CPU Overclocking up to 2.84 GHz
- CPU Voltages interface for undervolting/overvolting
- GPU idle frequency 27 Mhz added
- GPU governor selection support
- Show GPU frequency usage per frequency in Boeffla-Config
- Color control to adjust RGB color space + inverted mode
- SD card read ahead buffer configurable (default increased to 1024 kB)
- Ext4 File system tweaks (default to on, can be disabled)
- System Tweaks predefined supported (default is off)
- Android logger (logcat) configurable
- Kernel logger (dmesg) configurable
- Charge rates for AC charger, USB and wireless charging separately configurable (set charge rate to 0 to have stock charge logic back)
- Charge information display support via Boeffla-Config V2 app
- CIFS support (module, Important: make sure you unchecked option "Mount namespace separation" in SuperSU settings; do not mount inside /data or /storage)
- NFS support (module)
- NTFS support (module)
- XBox support (module)
- OTG-Ethernet support (module)
- TCP Congestion changed to Westwood
- Swap supported (but not recommended, zSwap used already)
- init.d support (in /system/etc/init.d - set correct permissions!)
- Default entropies increased
- Automatic EFS backup
- Full support for mpdecision for best compatibility and smoothness
(Important: use Boeffla-Config to configure min/max CPU frequencies + governors + schedulers only - or explicitely allow other apps/processes to overwrite this in Boeffla-Config settings, but expect weird side effects)
- Integrated full busybox 1.23.1 (own compilation)
- Auto-Root by kernel possible by request
- Kernel initialisation log file (with history of 3 log files)
- Emergency reset script automatically placed into /boeffla-kernel-data folder of your internal memory
- Presets supported in Boeffla-Config by kernel (Extreme power, power, normal, battery friendly and battery saving)
- Google gcc 4.8 toolchain used for best stability
- Initramfs of latest Samsung firmware
- Based on latest Samsung sources
- Kernel runs with SELinux enforcing by default, just as Samsung stock kernel for S5 - but can be configured to work in permissive mode in Boeffla-Config settings
- Knox and Samsung rom security warnings removed
- Note: I do NOT upstream the kernel to higher Linux kernel versions anymore as this usually has zero benefit but likely introduces new issues + is a waste of effort in the end
For all information and downloads (stable AND testing versions), visit the Boeffla-Kernel homepage:
History and design targets
Basically I created my first Boeffla-Kernel in 2012 as there was no kernel for the Samsung Galaxy S3 around that had exactly the mix of functionalities that I wanted. I wanted to have full flexibility in undervolting and charge rates for instance, but did not like the sharpness and/or brightness tweaks many kernels have implemented as per default.
Hence, I began to create my own kernel after a while, adding all the features I like. This is the result of my work, which in the end I decided to share with you. I hope you like it as much as I do.
The objective of this kernel is to have a kernel for daily use. It does not aim for best battery life, or best smoothness or best benchmark scores. Also it does not aim to have the broadest feature set available everywhere.
It aims more for a good mix of all, not sacrificing stability and functionality in the end.
And - most important: It aims to stay quite close to stock !!!
These design targets are also valid for the Galaxy S5 kernel here!!!
This said, I will definitely NEVER implement:
- things I do personally not need
- things I do not like
- things that are in any way dangerous
- anything which is highly experimental
- f2fs - it is known to cause various issues and compatibility problems
- a CAF based kernel
- anykernel method to use the ramdisk of the installed rom
- anything that requires upstreaming of kernel parts to a higher kernel major version
And: I do not really care about benchmark numbers, they say almost nothing as long as something is not completely wrong. Important for me is the feel-good factor.
I am also not interested in gaming at all, so never expect a gamer kernel. It will just not happen...
To reiterate it again: Flash the correct kernel depending on whether you are on Samsung Stock, CM12 or CM11 !!!
Configuration of the kernel
To tweak and configure the kernel, manually load and install the app "Boeffla-Config V2" from the downloads section on www.boeffla.de.
You need at least version 2.1.72 or higher for the Galaxy S5 Boeffla Kernels.
If you like my work, feel free to donate: Donation-Link
If you donate at least 2,49 EUR (to be in line with the donation app prices on Google Play store), you will receive a personal donation code which unlocks some nice little comfort functions in Boeffla-Config V2 on top.
All sources can be found in my Github repository: http://github.com/andip71
Credits to developers
Of course, I had never been able to create all that by my own. So I want to give credits to the really good developers around, that have given me all the inspiration and from which I cherry picked lots of the implemented functionalities:
... I just hope I did not forget someone. If so, please let me know and I will add you of course.
Thanks to all of you for your great work !!!
*** As always - Flash on our own risk! ***
Make sure you flash the correct version depending on your firmware version!
I can and will not take any responsibility for bricked phones or lost data.
It is generally recommended to run a complete Nandroid backup in your custom recovery and safely store your personal data before you flash a new kernel.
Cheers and enjoy