For devs: Looking to play with the kernel sources? - LG V20 ROMs, Kernels, Recoveries, & Other Developm

The good stuff: https://github.com/jcadduono/android_kernel_lge_msm8996/commits/android-7.0
Fork it!
Update: CAF branch has some problems at the moment, use this one instead for now.
So this is currently the v10d release. It's compatible with V20 Nougat v10d and G5 v20a.
Place toolchain (pick one up from here) in ~/build/toolchain & tar xf.
git clone https://[email protected]/yourname/android_kernel_lge_msm8996.git
If you want to change any config options:
./menuconfig.sh (optional target, ex. twrp or lge)
Ready?
./build.sh h850/h830/h918/us996/any model you want
Models are applied onto the target base defconfig, so your V20 kernels will build for all V20 variants and for all variants of the G5 as well.
Create your own by copying arch/arm64/configs/lge_defconfig to arch/arm64/configs/your-awesome_defconfig!
Grab:
build/arch/arm64/boot/Image.lz4-dtb [or] build/arch/arm64/boot/Image.gz-dtb
build/lib/modules
Place in:
https://github.com/jcadduono/lazyflasher/tree/kernel-flasher
make
You got yourself a magical all-powerful custom kernel installer, complete with your own custom kernel!
Notice that there's a few branches:
opensource is where I merge LG changes, when it's updated, android-7.0 is rebased on it
android-7.0 is a starting off point closest to absolute stock, base off here
android-7.0-security adds security and bug fixes from CAF on top of android-7.0 branch
twrp-7.0 is for Team Win Recovery Project (yes, it's ready, come with an unlocked device and I'll give it to you)
nethunter-7.0 is for the Kali NetHunter project (if you dare, some fun there)
Another issue was their weird build system, I dropped that. Replaced tuxera's exFAT prebuilt downloader with Samsung's GPL'd exFAT drivers instead. Unsure how well it works replacing it like that, we'll have to see.
I also added Qualcomm's Core Control which they just released the sources to somewhat recently. I believe it's already included on the G5 and probably V20 as a kernel module. Their released version doesn't have module support yet but it's fairly easy to add I guess with the leaked proprietary module version out there to pick pieces from.
Have fun!

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Great Man !

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thanks for this..

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I've been following the root process since the beginning and I'm amazed at the relatively short amount of time it took. Huge kudos to @jcadduono! I will purchase this phone. Now, since the kernel needed to have it's encryption support modifed, are the patches added to a branch on your Github fork? I would like to compile a custom kernel, along with patching it with SultanXDA's SafetyNet boot bypass. Which branch will be appropiate to fork to flash on the TWRP/Rooted V20?

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Thanks much @jcadduono! I'm going to start poking around in here and see if I can find anything particularly interesting.

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zabracks said:
Thanks much @jcadduono! I'm going to start poking around in here and see if I can find anything particularly interesting.
Click to expand...
Click to collapse
Hey guys so I did get a kernel booting but not yet one built from CAF sources so it'll take a bit of work to figure out why.
There seems to be a couple occurrences of null pointer dereferences in early boot stage in both stock release and this CAF. Currently investigating (or trying to anyway, it's hard to find people that can flash my test builds and report back with logs - I do not own this phone)

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jcadduono said:
Hey guys so I did get a kernel booting but not yet one built from CAF sources so it'll take a bit of work to figure out why.
There seems to be a couple occurrences of null pointer dereferences in early boot stage in both stock release and this CAF. Currently investigating (or trying to anyway, it's hard to find people that can flash my test builds and report back with logs - I do not own this phone)
Click to expand...
Click to collapse
I've got an H918, if you need somebody to test a kernel.

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jcadduono said:
Hey guys so I did get a kernel booting but not yet one built from CAF sources so it'll take a bit of work to figure out why.
There seems to be a couple occurrences of null pointer dereferences in early boot stage in both stock release and this CAF. Currently investigating (or trying to anyway, it's hard to find people that can flash my test builds and report back with logs - I do not own this phone)
Click to expand...
Click to collapse
two things. Did you figure out how to compile boot.img or are you flashing the zimage? also hit me up on hangouts I've been wanting to dive into this device just looking for someone else to colaberate with.
EDIT: sent email in PM

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albinoman887 said:
two things. Did you figure out how to compile boot.img or are you flashing the zimage? also hit me up on hangouts I've been wanting to dive into this device just looking for someone else to colaberate with.
EDIT: sent email in PM
Click to expand...
Click to collapse
I can compile it and flash it. There seems to be an issue with the sources LG has provided regarding display drivers. It seems any attempts at a stock kernel build results in a messed up screen once you hit the lock screen. I assume this has something to do with 2D graphics firmware and kernel framebuffer driver badly interacting. These sources are for v10b firmware, while the device appears to ship with v10d. I don't know if LG made any changes since then that could have caused this issue.
FYI the sources up right now are not my CAF merge, I had to move it to (same url but with -caf on the end) - I still have some issues to work out with the CAF merged sources (they aren't booting for whatever reason - not even TWRP).
It could take me a while to work on this as I still don't and likely never will own this device due to my lack of trust when it comes to LG.

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jcadduono said:
I can compile it and flash it. There seems to be an issue with the sources LG has provided regarding display drivers. It seems any attempts at a stock kernel build results in a messed up screen once you hit the lock screen. I assume this has something to do with 2D graphics firmware and kernel framebuffer driver badly interacting. These sources are for v10b firmware, while the device appears to ship with v10d. I don't know if LG made any changes since then that could have caused this issue.
FYI the sources up right now are not my CAF merge, I had to move it to (same url but with -caf on the end) - I still have some issues to work out with the CAF merged sources (they aren't booting for whatever reason - not even TWRP).
It could take me a while to work on this as I still don't and likely never will own this device due to my lack of trust when it comes to LG.
Click to expand...
Click to collapse
sounds like the kgsl drivers. If you want we can work together on this. I want to get CM going too i just need some help. Im and experienced dev but havent jumped in the LG pool before. id look at the google pixel kernel source and grab the kgsl/adreno crap and update that.
i'll clone the source and check it out since i'm finally getting the stock rom downloaded (thanks for the wget tip)

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jcadduono said:
I can compile it and flash it. There seems to be an issue with the sources LG has provided regarding display drivers. It seems any attempts at a stock kernel build results in a messed up screen once you hit the lock screen. I assume this has something to do with 2D graphics firmware and kernel framebuffer driver badly interacting. These sources are for v10b firmware, while the device appears to ship with v10d. I don't know if LG made any changes since then that could have caused this issue.
FYI the sources up right now are not my CAF merge, I had to move it to (same url but with -caf on the end) - I still have some issues to work out with the CAF merged sources (they aren't booting for whatever reason - not even TWRP).
It could take me a while to work on this as I still don't and likely never will own this device due to my lack of trust when it comes to LG.
Click to expand...
Click to collapse
which branch/repo is the one that boots but messed up display?

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albinoman887 said:
sounds like the kgsl drivers. If you want we can work together on this. I want to get CM going too i just need some help. Im and experienced dev but havent jumped in the LG pool before. id look at the google pixel kernel source and grab the kgsl/adreno crap and update that.
i'll clone the source and check it out since i'm finally getting the stock rom downloaded (thanks for the wget tip)
Click to expand...
Click to collapse
Would absolutely LOVE to see CM on our phones! Not that it'll make things move faster, but I'll throw 100 bucks your way if it's done before Christmas

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lightninbug said:
Would absolutely LOVE to see CM on our phones! Not that it'll make things move faster, but I'll throw 100 bucks your way if it's done before Christmas
Click to expand...
Click to collapse
I want Nethunter too
I'll be around to test any of the stuff, usually at night.

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The v20 kernel is available on the lg open-source site, at least the h990 one is.
Sent from my LG-H990 using Tapatalk
---------- Post added at 03:36 PM ---------- Previous post was at 03:25 PM ----------
Artcrime said:
The v20 kernel is available on the lg open-source site, at least the h990 one is.
Sent from my LG-H990 using Tapatalk
Click to expand...
Click to collapse
There is v10d version for 918. opensource.lge.com forgive me if this is old news. a|c
albinoman887 said:
sounds like the kgsl drivers. If you want we can work together on this. I want to get CM going too i just need some help. Im and experienced dev but havent jumped in the LG pool before. id look at the google pixel kernel source and grab the kgsl/adreno crap and update that.
i'll clone the source and check it out since i'm finally getting the stock rom downloaded (thanks for the wget tip)
Click to expand...
Click to collapse
slayerh4x said:
I want Nethunter too
I'll be around to test any of the stuff, usually at night.
Click to expand...
Click to collapse
albinoman887 said:
two things. Did you figure out how to compile boot.img or are you flashing the zimage? also hit me up on hangouts I've been wanting to dive into this device just looking for someone else to colaberate with.
EDIT: sent email in PM
Click to expand...
Click to collapse
Sent from my LG-H990 using Tapatalk

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I updated all the branches earlier today...should work fine now, so apparently was a source code issue that needed v10d update, not sure though no one's volunteered for testing (I don't do requests/testing over the forum, only on IRC)

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Is a kernel the main thing stopping us from a CM rom?

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what toolchain should we be using? got a link to a compiled one? i'm getting build errors I know are related to the toolchain but i've been out of the game for awhile. last i knew we needed gcc-4.9?

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jcadduono said:
I updated all the branches earlier today...should work fine now, so apparently was a source code issue that needed v10d update, not sure though no one's volunteered for testing (I don't do requests/testing over the forum, only on IRC)
Click to expand...
Click to collapse
I'm there.

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albinoman887 said:
what toolchain should we be using? got a link to a compiled one? i'm getting build errors I know are related to the toolchain but i've been out of the game for awhile. last i knew we needed gcc-4.9?
Click to expand...
Click to collapse
gcc-linaro-5.3.1-2016.05-x86_64_aarch64-linux-gnu.tar.xz .Be sure to change the PATH in menuconfig.sh
@jcadduono , thank you. You are truly an inspiration

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Wondering if anyone can help me learn how to do this right...
So I was able to compile the kernel, but I didn't get an Image.gz (which im sure is fine). I did get an Image.lz4, Image.lz4-dtb, and Image (no extension). I figure only the .lz4* files are needed. I added all 3 to the lazyflasher, and ran make. The resulting zip flashed, but sent me straight to Bootloader. I then tried to fix by flashing the stock kernel, but this still did not boot. ReFlashed my ROM and it's booting now.
I used this toolchain gcc-linaro-5.3.1-2016.05-x86_64_aarch64-linux-gnu
Any guidance? My guess is it's flashing at the wrong point?
Here is the ZIP. DO NOT FLASH. This is only for someone who knows what they are looking at to tell me what is wrong with it. No modifications were done. Source was forked from OP, and compiled with default menuconfig, then build.sh h918