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Samsung Galaxy J4 (samsung-j4lte)

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Samsung Galaxy J4
Samsung Galaxy J4, on postmarketOS boot splash screen
Samsung Galaxy J4, on postmarketOS boot splash screen
Manufacturer Samsung
Name Galaxy J4
Codename samsung-j4lte
Model SM-J400
Released 2018
Type handset
Hardware
Chipset Samsung Exynos 7570 Quad
CPU 4x 1.4 GHz ARM Cortex A53
GPU Mali T720
Display 720x1280 IPS
Storage 32 GB
Memory 2 GB
Architecture aarch64
Software
Original software
The software and version the device was shipped with.
Android 10
Extended version
The most recent supported version from the manufacturer.
Android
postmarketOS
Category downstream
Mainline
Instead of a Linux kernel fork, it is possible to run (Close to) Mainline.
no
pmOS kernel
The kernel version that runs on the device's port.
3.18.140
Unixbench score
Unixbench Whetstone/Dhrystone score. See Unixbench.
1492.7
Device package device-samsung-j4lte
Kernel package linux-samsung-j4lte
Features
Flashing
It is possible to flash the device with pmbootstrap flasher.
Partial
USB Networking
After connecting the device with USB to your PC, you can connect to it via telnet (initramfs) or SSH (booted system).
Works
Internal storage
eMMC, SD cards, UFS, ...
Works
SD card
Also includes other external storage cards
Untested
Battery
Charging and battery level reporting works
Works
Screen
Display works. Ideally with sleep mode and brightness control.
Works
Touchscreen
Works
Multimedia
3D Acceleration
Untested
Audio
Audio playback, microphone, headset and buttons.
Broken
Camera
Broken
Camera Flash
Untested
Connectivity
WiFi
Works
Bluetooth
Untested
Ethernet
Untested
GPS
Untested
Modem
Calls
Untested
SMS
Untested
Mobile data
Untested
Miscellaneous
FDE
Full disk encryption and unlocking with unl0kr.
Untested
USB OTG
USB On-The-Go or USB-C Role switching
Untested
Sensors
Accelerometer
Auto screen rotation works in desktops e.g. Phosh or Plasma Mobile
Untested
Magnetometer
Sensor to measure magnetism
Untested
Proximity
Untested
Hall Effect
Also known as flip cover sensor
Untested
Haptics
Untested
Barometer
Sensor to measure air pressure
Untested
Power Sensor
Sensor to monitor current, voltage and power. Not fuel gauge!
Untested

Contributors

  • manoedinata

Users owning this device


How to enter flash mode

Power + Volume Down + Home

In some cases, using power button to boot into Download Mode doesn't work. Instead, while pressing Volume Down + Home, connect the device to PC via USB. Don't release the buttons until you're in the Download Mode.

Installation

Use pmbootstrap to build your own installation image. The device configuration will also build firmware package, which contains required proprietary blobs for Wi-Fi.

Heimdall installation doesn't work. Use Installation_from_recovery_mode instead.

Known Working

  • Touchscreen
  • Screen & display
  • Framebuffer (additionally with msm-fb-refresher to refresh the screen)
  • Charging & battery status
  • Wi-Fi (partially, with firmware package)

Notes

Wi-Fi

To enable Wi-Fi, these proprietary blobs are required to be loaded:

vendor/etc/wifi/mx
vendor/etc/wifi/mx140.bin
vendor/etc/wifi/mx140_wlan.hcf

These files are pulled and packaged already in firmware-samsung-j4lte pmaports package.

Framebuffer

Some patches are required for framebuffer to fix some issues, e.g. swapped color.

The kernel panics with null pointer dereference if running framebuffer-based or text interfaces with CONFIG_FRAMEBUFFER_CONSOLE, or if you want to display kernel console to the screen. So, none or console environment doesn't show anything.

Note Newer DECON drivers as seen in newer devices e.g. Samsung Galaxy A51 (samsung-a51) also have similar issue, and can be fixed by keeping fb0 enabled. Could it be the same reason for our device?

See also