[KERNEL][BETA] GrassKernel for Galaxy M21

[Royna]

#include <android/disclaimer.h>
/*
  Your warranty is now VOID
  I am not responsible for any damage you made to your device
  You have been warned
*/
WARN_ON(1);

This is a custom kernel for the Galaxy M21, shipped with Exynos9611, tested on M215FDDU3CVL1
The name "Grass" came from a character of Genshin Impact to fill the background.

Features​

• Disable Samsung securities, debug drivers, etc modifications.
• Checkout and rebase against Android common kernel source, Removing Samsung additions to drivers like ext4,f2fs and more.
• Based on A51 OneUI5 latest kernel sources.
• Compiled with bleeding edge Neutron Clang 17, with full LLVM binutils, LTO (Link time optimization) and -O3.
• Import Erofs, Incremental FS, BinderFS and several backports.
• Supports DeX touchpad for corresponding OneUI ports that have DeX ported.
• Lot of debug codes/configuration Samsung added are removed.
• Upstreamed to 4.14.150 (for now, will be more)
• Added wireguard driver, an open-source VPN driver in-kernel
• More to come...

​

How to flash​

- The kernel is provided with AnyKernel3 zip, which can be just flashed on recovery, it will replace the kernel Image only to this kernel.

Download below

Sources

If you want to support my work
This will link to a friend's PayPal who always helps me.
Donate

 

[Royna]

Reserved

 

[Abdur Rahim Oni]

What is the major difference between the stock kernel and your grass kernel?
what does it improves after installing
why does it says oneui5 in the zip?

 

[Royna]

What is the major difference between the stock kernel and your grass kernel?
what does it improves after installing
why does it says oneui5 in the zip?

Just various ports and removing debugging increases perf a bit
OneUI5 cuz it's based on A51 OneUI5 and build script is like that

 

[w1nk1]

M215FDDU3CVL1 без перепробавал
все тврп рекавери

 

[BobaBoi69]

Just to be sure
is this a kernel or an upgrade to the firmware??
@Royna

 

[Fredin_]

M215FDDU3CVL1 как разблакировать загрузчик без пк

You don't need a pc to unlock bootloader, but you need some device that detects USB like a tv or another phone if you've got an adapter.

But you will need a pc to do everything else, like flashing recovery/magisk.

 

[newt23]

I installed this with LMOdroid 4.1 GSI. Geekbench 6 CPU score before and after:

 

[OldNoobOne]

Just to be sure
is this a kernel or an upgrade to the firmware??
@Royna

Hey friend BobaBoi69 ,
We need GrassKernel for A11 too. I'd love that.
Do you happen to know any custom kernel that works on anything A11 onwards? If yes pls share

 

[BobaBoi69]

Hey friend BobaBoi69 ,
We need GrassKernel for A11 too. I'd love that.
Do you happen to know any custom kernel that works on anything A11 onwards? If yes pls share

i am currently trying out naz kernel and honestly
switch to A12 LPOS REBORN it is an actual evolved and patched version i know the old one had problems but this one is a pure monster more like a beast mode monster
i love the thermal

 

[OldNoobOne]

i am currently trying out naz kernel and honestly
switch to A12 LPOS REBORN it is an actual evolved and patched version i know the old one had problems but this one is a pure monster more like a beast mode monster
i love the thermal

Hi Bobaboi69 friend,
I'm Happy for you
A12 LPOS REBORN Kernel.. do you have link for the kernel or rom ?

Ref: [ https://forum.xda-developers.com/t/...21-2020-21-tukirom-v1-2.4588319/post-88590585 ]

Hey Friend,
I just upgraded one of my SM-M215G devices to official A13 and its OneUI5.1 Core Version (Baseband M215GDDS3CWD1-20230522142126). Though I'm not able to flash any A13 GSI on it using (TWRP-3.5.2-m21-v3.1-A12.tar) , the oem unlock button is partially greyed out but not fully, its still light blue color, dunno whats going on , I relocked the unlockd the bootloader 3rd time now with no interference in setup process but I feel Shamshung might have introduced Bootloader Unlock Waittime just like in case of Shaomi devices :-/

 

[BobaBoi69]

Hi Bobaboi69 friend,
I'm Happy for you
A12 LPOS REBORN Kernel.. do you have link for the kernel or rom ?

I have the rom itself
I have uploaded the link in thread
I have added you to the thread try downloading it from there
If you face any kinds of problems ping me right away @OldNoobOne

 

[OldNoobOne]

I have the rom itself
I have uploaded the link in thread
I have added you to the thread try downloading it from there
If you face any kinds of problems ping me right away @OldNoobOne

Thanks friend Bobaboi69,
I am on baseband CWD1 and the Stock A13 (May Update) seems to be a R/O-System & No GSI boots past logo
I am scared to flash any ROM zips after I flashed Tuki1.2 coz my IMEI got erased when I tried to wipe phone & install Lineage 20 zip. I only upgraded from A11 Stock to A13 Stock just to try Grass Kernel. Grass Kernel is Faaaast

 

[BobaBoi69]

Thanks friend Bobaboi69,
I am on baseband CWD1 and the Stock A13 (May Update) seems to be a R/O-System & No GSI boots past logo
I am scared to flash any ROM zips after I flashed Tuki1.2 coz my IMEI got erased when I tried to wipe phone & install Lineage 20 zip. I only upgraded from A11 Stock to A13 Stock just to try Grass Kernel. Grass Kernel is Faaaast

Apparently my phone being the SM215F doesnt supprt A13 i am using the Current naz kernel which is keeping my phone cold and giving out better performance than before
But if the grass kernel seems to be working fine
Then stay within that kernel as it can be compatible with your model

 

[OldNoobOne]

Apparently my phone being the SM215F doesnt supprt A13 i am using the Current naz kernel which is keeping my phone cold and giving out better performance than before
But if the grass kernel seems to be working fine
Then stay within that kernel as it can be compatible with your model

Thanks friend,
I'm not comparing Naz Kernel with Grass Kernel, I'm not qualified to make any comment on kernels except as a general user perspective but right now kernel is not my problem really, I just want to get 1UI5.1 Core out and install GSI like Elixir/Crdroid/Ancient/Derp etc. but the problem is my bootloader is not fully unlocked and shamshung got fastboot/d disabled. Binary 3 wont allow Binary 1/2 also i read somewhere that May Update Stock ROM is RO-ROM. Why is shamshung ruining its own business, they should give some freedom to their customers..strange behavior.

I never knew about Naz Kernels existence untill you mentioned it.

 

[BobaBoi69]

Thanks friend,
I'm not comparing Naz Kernel with Grass Kernel, I'm not qualified to make any comment on kernels except as a general user perspective but right now kernel is not my problem really, I just want to get 1UI5.1 Core out and install GSI like Elixir/Crdroid/Ancient/Derp etc. but the problem is my bootloader is not fully unlocked and shamshung got fastboot/d disabled. Binary 3 wont allow Binary 1/2 also i read somewhere that May Update Stock ROM is RO-ROM. Why is shamshung ruining its own business, they should give some freedom to their customers..strange behavior.
View attachment 5925235

I never knew about Naz Kernels existence untill you mentioned it.

The only way to fix this might be to downgrade to lower firmware version i.e the 2022 patch
As for me with my SM215F the bootloader option is not greyed out but still allows me to turn it on and off
Let me know it its working or not

 

[newt23]

View attachment 5925235

It's supposed to be like this. This means your bootloader is unlocked. Once unlocked, you can only re-lock it from download mode which is why it's greyed out in settings.

 

[OldNoobOne]

It's supposed to be like this. This means your bootloader is unlocked. Once unlocked, you can only re-lock it from download mode which is why it's greyed out in settings.

Yes I got some help from Curstantine & so Bobaboi69 was right, after I downgraded from M215G A13 May 2023 stock Firmware to M215F A12 Sept 2022 Stock Firmware now GSI boots again. Yes bootloader unlocked but its going to be a challenge to flash Grass Kernel now. Im gonna try though. Thanks for all your help friends.
#EDIT: Grass Kernel (June 2023 version) booted, the older version booted too. I am going to try Mint Kernel too

 

[BobaBoi69]

Thats amazing good thing

Yes I got some help from Curstantine & so Bobaboi69 was right, after I downgraded from M215G A13 May 2023 stock Firmware to M215F A12 Sept 2022 Stock Firmware now GSI boots again. Yes bootloader unlocked but its going to be a challenge to flash Grass Kernel now. Im gonna try though. Thanks for all your help friends.
#EDIT: Grass Kernel (June 2023 version) booted, the older version booted too. I am going to try Mint Kernel too

 

[OldNoobOne]

Thats amazing good thing

Thanks Friend,
I feel the devs are working with M215F DT and not M215G trees because the latter came later, so I had to downgrade to M215F A12 to get some things working again. Correct me if i'm wrong though.
P.S.:- (Just Imagining) I think to make the andoid custom developement model smoother & hassle-free both for the Devs and the users, XDA & others could perhaps introduce a crowd-funding option for every device released in the market so that the devs can get hold of the devices sooner and start building custom stuff for the devices & then the users won't have to wait for 2 years to get the best possible ROMS for their devices