LG G3 Europe (lg-d855)

=== Contributors ===
* Nutcake
=== Fastboot ===
Before you can use fastboot on this device you need to remove LGs Download mode, which hides the standard fastboot mode. You can do this by zeroing out a partition called 'laf':
adb shell
su
dd if=/dev/block/platform/msm_sdcc.1/by-name/laf of=/sdcard/laf.img #backup LGs Download mode to the internal SD just in case
dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/laf #Overwrite laf with zeroes, enabling fastboot
exit
adb reboot bootloader #reboot directly to fastboot
More detailed instructions for this can be found here
Afterwards, you can boot into fastboot by following these steps:
1. Turn of phone completely
2. Hold Volume Up.
3. Plug in USB-cable while still holding Vol. Up until fastboot pops up
=== Signing the boot image ===
pmbootstrap will successfully flash rootfs and kernel, however the device will only boot if you use the
pmbootstrap flasher boot command, as it will otherwise show this error:
ERROR : boot certification verify
[630]_________________________________________
[640]
[640] Secure booting Error!
[640] Cause : boot certification verify
[640]
[640]_________________________________________
The message is shown for 3 seconds, then the screen blacks out and the LED will blink red and blue indefinitely.
This happens because the bootloader on the d855 variant of the LG G3 can not be unlocked and you have to trick the bootloader into thinking your boot image is legitimate.
To do this, you need to first export your boot.img-lg-d855:
mkdir -p /tmp/pmOS_export
pmbootstrap export /tmp/pmOS_export
Then we need a tool called Open_Bump, which can sign boot images for our device. (Requires Python 2. Also works for older LG devices?):
git clone https://github.com/CyboLabs/Open_Bump
cd Open_Bump
python2 open_bump.py "/tmp/pmOS_export/boot.img"
This will create a signed image called boot_bumped.img in /tmp/pmOS_export/.
Now first flash System and kernel images using pmbootstrap and then manually flash the signed image over these:
pmbootstrap flasher flash_rootfs
pmbootstrap flasher flash_kernel
fastboot flash boot /tmp/pmOS_export/boot_bumped.img
== lk2nd ==
To avoid the secure boot error and get lk2nd running, download lk2nd-msm8974.img from here and remove the "SEANDROIDENFORCE" 53 45 41 4E 44 52 4F 49 44 45 4E 46 4F 52 43 45 bytes at the end of the file with a hex editor.
Then bump lk2nd-msm8974.img with this script and flash it to the phone with the following commands:
python2 bump.py lk2nd-msm8974.img
fastboot flash boot lk2nd-msm8974_bumped.img
If the bytes haven't been removed, the script will think that lk2nd has already been bumped.
== Mainline kernel ==
List of features working on mainline kernel:
Component 	Model 	Status	Notes
SoC 	Qualcomm MSM8974AC Snapdragon 801 	Y 	
USB 	- 	Y 	Working in dual-role mode.
HDMI (SlimPort) 	Analogix ANX7812 	N 	Driver available in mainline.
eMMC 	SanDisk SDIN9DW4 	Y 	
microSD 	- 	Y 	
Display 	LG LH550QH1-SD03 	N 	Connected through Dual DSI. Framebuffer location: 0x3200000 (Stride 3)
LCD Backlight 	Ti LM3697 	N 	Driver available in mainline.
Touchscreen 	Synaptics S3528A1 	Y 	
Charging IC 	Ti BQ24296 	Y 	LetuxOS has a driver for it. BQ24190 driver in mainline seems to work fine for now.
Wireless Charging IC 	IDT P9025A 	N 	
Fuel Gauge 	Maxim MAX17048 	Y 	
Buttons 	- 	Y 	GPIO
Gyroscope 	InvenSense MPU-6515 	P 	Missing mount-matrix.
Ambient light and proximity sensor	Avago APDS-9930 	Y 	
Magnetometer 	ALPS HSCDTD008A 	P 	Missing mount-matrix.
Pressure Sensor 	ALPS HSPPAD038A 	N 	
IIRC Sensor 	Maxim MAXQ616V 	N 	
Hall Effect Sensor 	ROHM Semiconductor BU52061NVX 	Y 	GPIO
NFC 	NXP PN547 	Y 	
Audio 	Qualcomm WCD9320 	N 	
Speaker amplifier 	Cirrus Logic CS35L32 	N 	Driver available in mainline.
Audio Jack detection IC 	Maxim MAX14688 	N 	
GPU 	Qualcomm Adreno 330 	N 	
WLAN 	Qualcomm WCN-3680B 	Y 	
Bluetooth 	Qualcomm WCN-3680B 	P 	HCI doesn't always come up.
Modem 	- 	N 	Firmware doesn't load due to its weird memory region overlapping with other firmware.
Front camera 	Sony IMX208 	N 	Driver available in mainline.
Main camera 	Sony IMX135 	N 	
Status LED 	Citizen Electronics CL-503S RGB LED	Y 	Works using PM8941 LPG.
Dual Flash LED 	LG Innotek LEYRS63A81GW00 	N 	
Panel power supply 	Ti TPS65132 	N 	Driver available in mainline.
Haptics 	Syncoam SM100 	Y 	Works using clock based vibrator driver.
== Links ==
* Original Kernel Source
* Service manual (containing lots of schematics!)
* Mainline kernel fork for d855
== Photos ==
* Weston running with demos
* Secure booting error when using unsigned image
* /r/postmarketOS post