[DISCONTINUED][KERNEL][STOCK][CM10.1][CM11][ R10 ] for mint2g i.e Samsung GT-S5280/2

psych.half · Feb 15, 2016

After maybe a month of working in the kernel.
I guess it's about time to release the kernel for testing.

Downloads in the second post are only there for easy follow ups.
Please read all the sections below before trying out this kernel first.

This kernel comes with absolutely no warranties whatsoever, period.

XDA:DevDB Information
This field is required., Kernel for the Samsung Galaxy Star

Contributors
psych.half
Kernel Special Features:

Version Information
Status: Testing

Created 2016-02-15
Last Updated 2017-10-12

psych.half · Feb 15, 2016

Downloads

Latest : kernel-mint2g-trilogy-stable-r10.zip

The latest version is tested to be booting on :
Stock JB4.1 with CWM 6.0.5.3 by @dabakale
CM-10.1 with Philiz recovery by @medved197938
CM-11 with TWRP 3.0 by me

If you are getting status 7 errors, while flashing.
Try with a different recovery, and if that doesnt help upload the /sdcard/liverepack.log along with recovery.log from your recovery.

Changelog:

Code:

==================================
r10 : Apr 7, 2016
- Added and fixed custom voltage control, It could be errornessly set lesser than 650mV.
- Added underclocking. Needs to be enabled manually, see post #
- Removed 1400Mhz and 1500Mhz frequencies, as it causes crashes on many devices.
- MTP should now work on both Stock/CM rom (needs testing )
- Fixed battery level getting stuck issue.
- Fixed brightness/constrast bug in stock ROM.
- Initial stable* release of trilogy version.

psych.half · Feb 15, 2016

Extra downloads

camctl : script to enable/disable camera for RAM

psych.half · Feb 15, 2016

How this thread is organized.
The OP has been broken down into sections. The first 20 posts reserved for info/wiki sort of.
So when things get updated/added it'll all be in the first few pages for everyone to see.

Each section will be short and to the point so you're having problem with one section.
And you're the type who just has to quote posts you might do so without getting on other people nerves.

And normally I just just ignore the forum's usual craptalks, but at this early stage of development, try to keep the noise minimal

psych.half · Feb 15, 2016

Let's make some things clear first.

This kernel is not for you if you want a stable kernel.
CM11 should already include the stable version of this kernel, so you should just stick to that.

This kernel is only for CM11. No other roms will be supported or even considered.

This kernel is higly experimental. Freshly made, straight from the lab.
So expect some breakage of functionality, random reboots, bootloops and explosions (unlikely, but I gotta cover myself).

psych.half · Feb 15, 2016

Flashing
The zip makes no backup of your current kernel as of now.

So if you wanna go back to shipped CM11 kernel you have two options.
i) Manually move the original modules to system and restore just the boot image from TWRP.
ii) Restore/flash the entire ROM.

As for flashing the zip, you should burn it on a CD, and choose boot from CD in your PC by keep pressing F10/F12 at BIOS screen.

Well no but, you should at least be familiar with flashing and backups.

psych.half · Feb 15, 2016

Breakages

Camera:
Well, it's due to updated ION drivers, which are not compatible.
In the meant time I have disabled memory allocation for camera.
Which should give some extra free memory.

If there's any other stuff broken here but not while using CM11 kernel.
Post it here instead of there. But not the stuff broken in shipped CM11 too.

psych.half · Feb 15, 2016

What are not bugs.

24mb of less RAM:
Linux ate the RAM, no really.. linux eats RAM http://www.linuxatemyram.com
Well it's due to enabling memory cgroups.
Android says keep it enabled for low ram devices.
As per https://source.android.com/devices/tech/config/low-ram.html

Also, see the below sections for frequency scaling

psych.half · Feb 15, 2016

Bug reporting
You know you won't get help the next time from a kernel dev if you give them a logcat.

So get the dmesg or no help for you.

And /proc/last_kmsg is not working due to ram console issues.
So if you're gonna be reporting random reboot issues, make it reproduceable.
And make it precise. If the issue is caused because you have installed, some 10 or 20 other mods.
Good luck solving it.

psych.half · Feb 15, 2016

What are in the kernel.

You get your usual stack of IO schedulers, governors, dynamics and mods. They won't be included in the change log below.
I don't even know what half of those are.
So don't ask me what/which one to use. See them for yourself.

You also get some usual tweaks, which can be changed with any kernel control app you like.
Same don't ask what/how to tweak.

If you want something to be added that you don't find. Let me know, and I'll see what I can do.

psych.half · Feb 15, 2016

Frequency scaling

Frequency scaling is already included from r3 onwards. So the previous instructions no longer applies.

The default min and max frequency is 1Ghz and default governor performance. ie. same as stock.

Any change to that is your own choice.
And your own loss if something goes wrong.

There are some limits to it.
i) It can be only changed 10 times a second, so it might cause lag sometimes.
So choose your governor and scaling wisely. Battery or performance. You decide.

Underclocking has been removed.
Going below 1000Mhz makes no sense, as the core voltage is the same.
There is no point in reducing frequency, if the power consumption is constant.

Overclocking has it's own section. See below

psych.half · Feb 15, 2016

Overclocking
First if you were using the older broken cpufreq driver and were in the impression that you were at 1.6Ghz you're gonna damage your device.

The driver written by me, really overclocks the cpu and the whole system, yeah mines fractured too. Nothing I can do about it.

So use at your own risk. And don't discuss about the safe overclocking frequency. There isn't any.
Issues caused by overclocking are not issues. or bugs.

I won't give you any overclocking advice. But here's one anyway.
Overclock only when necessary and do not keep the values persistent at boot, "Set at boot" in apps.

psych.half · Feb 15, 2016

Changes from stock:

A lot of thing has been updated, changed, modified. I will have to go through source again.
A short list of changes I can think right now will be posted soon.

- The you know, built with some GCC-5 Linaro toolchain and O2.
- Cherry picked upgrades from various kernel sources.
- Disabled a whole lot of Samsung debugging.

But there's more... see the Github repo.

psych.half · Feb 15, 2016

reserved

psych.half · Feb 15, 2016

#Reserved

psych.half · Feb 15, 2016

#Reserved

psych.half · Feb 15, 2016

#Reserved

psych.half · Feb 15, 2016

Source

kernel:
https://github.com/halfpsych/kernel_mint2g

cpufreq-driver: https://github.com/mint2g/kernel_module_cpufreq-driver

psych.half · Feb 15, 2016

Contributing.

Any contributions to both source and wiki are always welcome.
You can help fix typos or better clarify some sections or even help to write new ones.

psych.half · Feb 15, 2016

Credits

For bringing CM11 to this device
- corphish
- Dreamstar
- TeamButter
- All others involved in CM11 mint2g project

Initial testers and bug reports:
- Dark Knight Begins

[DISCONTINUED][KERNEL][STOCK][CM10.1][CM11][ R10 ] for mint2g i.e Samsung GT-S5280/2

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