[INCOMPLETE HOW TO] Reconstruct Mi 4c kernel source

[zhukry]

Yes, even Xiaomi source ready for CM 12.1[/Q
Just try but got stuck on mi logo

 

[ketut.kumajaya]

Yes, even Xiaomi source ready for CM 12.1[/Q
Just try but got stuck on mi logo

Do you build it from source or kernel image repack (with CM 12.1 ramdisk)?

 

[ketut.kumajaya]

Strange, Lollipop ROM but Marshmallow kernel
Almost everything working, except:
- In-kernel USB driver not compatible to Lollipop ROM, MTP and adb not working
- Equalizer not working, incompatible soundfx libraries
- Wrong headset button mapping
- I'll check further, still under testing

- I found only adb not working. MTP working with adb debugging disabled.
- Headset button mapping fixed

Stock ROM not my main target but if almost everything working on stock (including camera, sounds, GPS, sensors, IR LED, WiFi, etc), it's time to start CyanogenMod

 

[Pikachu8119]

have you updated adreno driver? and what's with heating?

 

[ketut.kumajaya]

have you updated adreno driver? and what's with heating?

No userspace blobs update, MIUI 7.2.1.0 . No heating, I just use my 4c for alarm :laugh:

 

[ketut.kumajaya]

Done!

Marshmallow branch: https://github.com/kumajaya/android_kernel_xiaomi_msm8992/tree/marshmallow
Lollipop branch: https://github.com/kumajaya/android_kernel_xiaomi_msm8992/tree/marshmallow-for-lollipop

Everything should be working for Marshmallow ROM, adb debuging and equalizer not working for Lollipop ROM (tested on MIUI 7.2.1.0).

 

[solis_f]

Done!

Marshmallow branch: https://github.com/kumajaya/android_kernel_xiaomi_msm8992/tree/marshmallow
Lollipop branch: https://github.com/kumajaya/android_kernel_xiaomi_msm8992/tree/marshmallow-for-lollipop

Everything should be working for Marshmallow ROM, adb debuging and equalizer not working for Lollipop ROM (tested on MIUI 7.2.1.0).

Very nice thanks a lot! By saying equalizer what exactly do you mean? Waiting for a flashable zip!

Edit: will mm kernel work on Lollipop roms? I see some people in other devices reporting this

 

[ketut.kumajaya]

Very nice thanks a lot! By saying equalizer what exactly do you mean? Waiting for a flashable zip!

Edit: will mm kernel work on Lollipop roms? I see some people in other devices reporting this

Sounds equalizer, soundfx. I knew about this issue when working for Redmi 2. Updated kernel need updated soundfx blobs.

Boot image contains kernel image + device tree image + ramdisk. In Mi 4c stock ROM case with kernel 3.10.84, I have to restore in kernel logger support to prevent battery manager crash and WiFi patch for a success insmod: https://github.com/kumajaya/android_kernel_xiaomi_msm8992/commits/marshmallow-for-lollipop . Ramdisk always incompatible between ROM. We can repack a same boot + device tree image with a different ramdisk.

EDIT: I boot MIUI ROM with Marshmallow kernel (3.10.84 kernel + dt image + modified stock ramdisk) for development purpose only. Everything works correctly on stock ROM, except already mentioned issues. When I use it for Marshmallow ROM, everything should be working or if something goes wrong, it's userspace problem. For example, no video flicker on stock ROM, should be no video flicker on Marshmallow ROM.

 

[solis_f]

Sounds equalizer, soundfx. I knew about this issue when working for Redmi 2. Updated kernel need updated soundfx blobs.

Boot image contains kernel image + device tree image + ramdisk. In Mi 4c stock ROM case with kernel 3.10.84, I have to restore in kernel logger support to prevent battery manager crash and WiFi patch for a success insmod: https://github.com/kumajaya/android_kernel_xiaomi_msm8992/commits/marshmallow-for-lollipop . Ramdisk always incompatible between ROM. We can repack a same boot + device tree image with a different ramdisk.

Alright waiting for miui Lollipop kernel when its fully working! Keep up the good work! Thanks a lot!

 

[Brunnys]

@ketut.kumajaya Is it possible to resolve this issue using your kernel?
https://www.youtube.com/watch?v=uPC7Z2ploxc
BTW many thanks for your efforts

Sent from my Mi-4c using XDA-Developers mobile app

 

[ketut.kumajaya]

@ketut.kumajaya Is it possible to resolve this issue using your kernel?
https://www.youtube.com/watch?v=uPC7Z2ploxc
BTW many thanks for your efforts

Sent from my Mi-4c using XDA-Developers mobile app

Not sure, what if the problem came from touchscreen firmware. Let me check it later.

 

[Ydraulikos]

Does anyone know how to implement a voltage control interface? I couldn't find a kernel with this feature, it seems something is different from older krait processors.

 

[akrai]

do you know if is it possible to add fm radio support? in theory our phone have fm radio, at least that is what the sellers says, but no drivers for fm are included, but another xiaomi phone was also in our same situation and after a year they had fm support...

 

[gonzalocav]

I will create a new thread "How to build libra kernel from source".

It would be fantastic to have some nice guidelines!

Keep up the good work!

 

[Morloc2]

do you know if is it possible to add fm radio support? in theory our phone have fm radio, at least that is what the sellers says, but no drivers for fm are included, but another xiaomi phone was also in our same situation and after a year they had fm support...

+1

 

[vikoadi]

Hello,
I'm compiling this kernel https://github.com/MiCode/Xiaomi_Kernel_OpenSource/tree/ido-l-oss for redmi 3
But the kernel stop booting as it doesn't found a sound card.
Running ls /dev/snd return only timer while it will have some pcm and other device in stock kernel.
Can somebody point me where to look at?
Thanks

Sent from my Redmi 3 using XDA Labs

Sent from my Redmi 3 using XDA Labs

 

[SatrioDwiPrabowo]

Its awesome thanks i'll try thanks mastah

 

[kyoto44]

good