Xiaomi Redmi 4X (xiaomi-santoni)

From postmarketOS
Xiaomi Redmi 4x
xiaomi-santoni running pmOS demos
xiaomi-santoni running pmOS demos
Manufacturer Xiaomi
Name Redmi 4x
Codename xiaomi-santoni
Released 2017
Category testing
Pre-built images no
Original software Android (MIUI)
Original version 6.0
Extended version 7.1
postmarketOS kernel 3.18.140
Hardware
Chipset Qualcomm Snapdragon 435 (MSM8940)
CPU Octa-core 1.4 GHz Cortex-A53
GPU Adreno 505
Display 720x1280
Storage 16 GB / 32 GB / 64GB
Memory 2 GB / 3 GB / 4 GB
Architecture AArch64
Type Handset
Unixbench Whet/Dhry score 1526.7
Features
USB Networking
Works
Flashing
Works
Touchscreen
Works
Display
Works
WiFi
Works
FDE
Partial
Mainline
Works
Battery
Works
3D Acceleration
Audio
Works
Bluetooth
Partial
Camera
Broken
GPS
Mobile data
Internal storage
SMS
Calls
USB OTG
Works
NFC
Sensors
Accelerometer
Magnetometer
Ambient Light
Proximity
Hall Effect
Barometer
Power Sensor
Misc
Built-in DVB
Camera Flash
Keyboard
Touchpad
USB-A
HDMI/DP
Ir TX
Ir RX
Stylus
Memory Card
Haptics
Ethernet
FOSS bootloader


Contributors

  • pinoaffe
  • asriel-danctnix
  • Danct12

Maintainer(s)

  • Danct12

Users owning this device


Mainline kernel?

There's ongoing effort to bring up mainline kernel on MSM8937 platform, with initial focus on santoni: [1].

MSM8937/40 is pretty close to MSM8916, so a lot of drivers can be re-used with proper device tree and minimal address remapping in some places.

Parts Components In Torvalds tree?
Chipset MSM8940 No
GPU Adreno 505 Yes (a5xx_gpu.c)
Touch Screen FT5X06 Yes (edt-ft5x06.c)
Fingerprint Sensor FPC1020/Goodix No
Accelerometer + Gyroscope ICM20607/BMI120 No/Yes (bmi160_i2c.c)
ALSPS STK3X1X Yes (stk3310.c)
Magnetometer YAS537 Yes (yamaha-yas530.c)
Sound AW87319 No
Notifications LED AW2013 Yes (leds-aw2013.c)
Front Camera OV5675 Yes (ov5675.c)
Back Camera S5K3L8 No

More information on this port

Bootloader Unlocking

Like other Xiaomi devices, the user will have to acquire the bootloader unlock key: https://en.miui.com/unlock

The device will not unlock if the device isn't 7 days old (from the time when your device connects to internet and powered on)

If unlock fails at "Can't get info", start unlock process, disconnect USB and reconnect it once the counter hits 99%.

Key combinations for entering Recovery/Fastboot

Recovery

  • Turn the device off (or restart also works)
  • Hold both volume buttons (+ and -) and power button
  • Keep holding until you got to recovery.

Fastboot

  • Same as recovery, but this time hold the volume down key instead of both keys.

Installation

Installation over fastboot works, Android recovery zip installation is untested.

Bluetooth

Bluetooth on this phone is using the WCNSS chip, which provides two SMD channels to the BT core, one for command and one for event packets. Support for Bluetooth HCI SMD can be added using this patch.

With that patch applied, the Bluetooth interface can be bring up by set /sys/module/hci_smd/parameters/hcismd_set to 1. Then install bluez, start the service and use bluetoothctl to control it.

As right now, it seems to connect, but disconnect very quickly, it doesn't ask for pair code when connecting, so this needs to be investigated.

Serial Connection (UART)

The Serial Connection of the santoni has been tested only on reception mode, with 3.3v TTL to USB FT232RL. This example is an output when starting to fastboot.

Warning: the test point is very small, try to solder only if you're an expert on soldering or you may break the motherboard wirings.

Wiring: (Santoni TX --> FT232RL RX) and (Santoni GND --> FT232RL GND)

Photos

See also