[BOUNTY] Custom kernel SM-G935F/FD

[Neemac]

Okay. So apparently Samsung have made some changes to the kernel in S7 compared to other Samsung's.

In order to make the kernel boot, you have too disable tima_rkp. But disabling tima_rkp makes the kernel unstable.
We can make the Kenrel stabel, by disabling the FP lock. But then again. A very used feature of the phone is useless

I figured out by putting out a bounty, maybe some developers are willing too have a look at it, and see if it's a way too make this work. Currently Samsung have 4 kernel sources out here




Anyway. Don't let me disturb you any more, and let's start this bounty tread.

I'll start with pledging $50 for the one who can make a stable custom kernel for our beloved S7 edge. (935F/fd)
Please notice, there is no minimum pledge. You are free to pledge what ever amount you want too.

Current status : $396 bounty

 

[Okarina26]

i am in with 50$ too..!!

 

[iNeoTom]

Same here i will pledge $50 worth every penny :highfive:

 

[strikerdj2011]

£50 here which is about $71

 

[SumDum YunGuy]

$50 from me too

Sent from my SM-G935F using Tapatalk

 

[Okarina26]

i already asked the hacker for help to built a kernel but he doesnt have his S7 anymore..

Sent from my SM-G935F using XDA-Developers mobile app

 

[Neemac]

i already asked the hacker for help to built a kernel but he doesnt have his S7 anymore..

Sent from my SM-G935F using XDA-Developers mobile app

Yeah, I think he Sent it back the same day unfortunately :/

 

[lost_]

USD 75

I'm an S7 930F user, but Edge 935F development is more active, and there is little to no difference anyway. I'm sure , if needed, it can be recompiled for 930F.

 

[Faspaiso]

Out of curiosity, why is a bounty needed for making a custom kernel for the S7? The rom development was quite active on the S6, so why is it so "dead" at least from a kernel perspective here? I mean, is a custom kernel just not happening for the S7 or will we set some in the near future?

 

[Neemac]

Out of curiosity, why is a bounty needed for making a custom kernel for the S7? The rom development was quite active on the S6, so why is it so "dead" at least from a kernel perspective here? I mean, is a custom kernel just not happening for the S7 or will we set some in the near future?

As its my understanding, the major problem with a custom kernel, is the implementation of tima_rkp, Samsung have been using on this kernel. Just in order too have the kernel boot, you have to disable it, but then again, you will have a unstable kernel. It can be some stable, if you don't use any hard-coded security features, like fingerprint unlock and so on.

Swipe to wake works, with very few too none reboots. But still it isn't stable.

That's why it's a little bounty out, too trigger the willingness of other developers too take some of their free time and have a look at it.

As you prob noticed, there isn't any custom kernel out yet, tho the S6 hade a few kernels out just a week after release.

 

[Zyxxeil]

I'll take a look at it later, but I can't promise anything.

 

[dave7802]

Out of curiosity, why is a bounty needed for making a custom kernel for the S7? The rom development was quite active on the S6, so why is it so "dead" at least from a kernel perspective here? I mean, is a custom kernel just not happening for the S7 or will we set some in the near future?

To make it simple, its as simple as
Open Source
and No Source.

exynos = closed source (Making development very difficult)
Snapdragon = Open Source (Everyone can have a go)

I can only assume the S6 had both a Snapdragon and exynos variant and the exynos being less popular

 

[NonXtreme]

To make it simple, its as simple as
Open Source
and No Source.

exynos = closed source (Making development very difficult)
Snapdragon = Open Source (Everyone can have a go)

I can only assume the S6 had both a Snapdragon and exynos variant and the exynos being less popular

Nope
Samsung's already release KERNEL source for exynos S7 or else this thread won't even exist.
This thread is here because of the new change samsung had made to S7 kernel (mostly security stuff) make modifying the kernel without too much trouble hard
Also S6 had only Exynos version because of the underperforming sd810.

Sent from my SM-G935F using Tapatalk

 

[Faspaiso]

To make it simple, its as simple as
Open Source
and No Source.

exynos = closed source (Making development very difficult)
Snapdragon = Open Source (Everyone can have a go)

I can only assume the S6 had both a Snapdragon and exynos variant and the exynos being less popular

That's only for custom roms, which is the reason we *might* never see a stable AOSP Rom. There are sources out for the kernel.

 

[dave7802]

Bla cba with the response, I was more down the lines of AOSP
as i dont see any other real benefit to a custom kernel.

Its not like the S7 suffers from Lag / Performance issues or battery draining.

(My original replay was much longer going into detail, stupid page timeout)

 

[pigmich]

To make it simple, its as simple as
Open Source
and No Source.

exynos = closed source (Making development very difficult)
Snapdragon = Open Source (Everyone can have a go)

I can only assume the S6 had both a Snapdragon and exynos variant and the exynos being less popular

s7/ s7edge also got its own Snapdragon Version

 

[Jeshter2000]

s7/ s7edge also got its own Snapdragon Version

Closed bootloader...

 

[Beefheart]

Bla cba with the response, I was more down the lines of AOSP
as i dont see any other real benefit to a custom kernel.

Its not like the S7 suffers from Lag / Performance issues or battery draining.

Indeed. The main reason for a custom kernel for me has always been for permissive, which V4A requires to work. But there is now a work around for this on enforcing kernels so I'm really not that bothered. It's not as if Exynos S7/S7E devices suffer from battery life issues or overheat problems which underclocking and/or undervolting could fix. It works very well as is, I get between 6 and 7 hours SOT on average and it's very stable in all other departments. In short, the need for a custom kernel has greatly diminished on this device, especially in comparison to the S6/S6E/S6E+ which all had terrible battery life. But if it's important to some people then good luck in getting one sorted.

 

[krogoth]

I'M a 930 user, but it will fix our problems as well.

50$ from me.

 

[jesec]

Here are the temporary solutions.

Way A:
Remove /system/lib/libbauth* , /system/lib64/libbauth*

Way B: (If you want to completely disable (or bypass) TEE)
Remove /system/lib/libbauth* , /system/lib64/libbauth*
Replace /system/lib64/hw/gatekeeper.exynos8890.so,/system/lib64/hw/keystore.exynos8890.so with these i uploaded.

Both of them will make your FP Sensor not working.
(Lock Screen will work)
But,at least,you get a stable custom kernel.

I am trying to re-implement FP sensor support to system with TEE disabled.
Here is some files from somewhere confidential and a simple kernel compiled by me and my build.prop.