LG Fx0 (lg-madai)

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LG Fx0
LG Fx0 running Xfce4
LG Fx0 running Xfce4
Manufacturer LG
Name Fx0
Codename lg-madai
Released 2014
Category testing
Original software Firefox OS 2.0
Hardware
Chipset Qualcomm MSM8926 Snapdragon 400
CPU 4x ARM Cortex-A7
GPU Adreno 305
Display 720x1280 TFT
Storage 16 GB
Memory 1.5 GB
Architecture armv7
Non-Android based device
Features
USB Networking
Works
Flashing
Works
Touchscreen
Works
Display
Works
WiFi
Partial
FDE
Mainline
Battery
Works
3D Acceleration
Audio
Bluetooth
Camera
GPS
Mobile data
SMS
Calls
USB OTG
NFC
USB-A
HDMI/DP
Keyboard
Touchpad
Sensors
Accelerometer
Magnetometer
Ambient Light
Proximity
Hall Effect
Barometer
Power Sensor
Misc
Ir TX
Unavailable
TrustZone
FOSS bootloader



Contributors

  • peremen

Maintainer(s)

Users owning this device

How to enter flash mode

  • Hold Power + Volume Down: LG Recovery (only factory reset)
  • adb reboot recovery on adb shell: AOSP recovery
  • Hold Volume Up while connecting to the USB: LG download mode/fastboot (if laf partition is zeroed)
  • Source: [1]

Installation

To use fastboot you need to remove the laf on the Firefox OS. Given that there is no kdz or tot file for this device available, it does not make sense to keep laf for flashing.

# Backup your LAF partition - on adb shell
su
dd if=/dev/block/platform/msm_sdcc.1/by-name/laf of=/sdcard/laf.img
dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/laf
# On the host
adb pull /sdcard/laf.img

There are three partitions: system (1 GiB ext4, mmcblk0p35), userdata (4 GiB ext4, mmcblk0p37), and sdcard (~8.5 GiB vfat, mmcblk0p38). Do not ZERO out the userdata partition, as this partition contains some firmware files (audio and Wi-Fi) customized to the device.

Components

  • UART: According to service manual UART is provided as a part of JTAG connector, unpopulated by default and only accessible after opening the case. The Pin 14 (lower right, bigger pad than others) is MSM_UART_TX, which needs to be hooked up to the RX of the UART adapter.
  • Wi-Fi: Qualcomm WCNSS. Note that the LG source code archive lacks the prima driver, which is used in Firefox OS. According to dmesg in Firefox OS, it is version v3.2.3.172. Porting the prima driver from LineageOS kernel makes Wi-Fi work, but it seems that NetworkManager seems not like this configuration.
  • Display: no backlight adjustment yet, also had to change the visual to RGB565 to get a working Xfce4.
  • Given the sorry quality and lower version of stock LG kernel, maybe mainlining could be worth?

See also