Xiaomi Redmi 4 Prime (xiaomi-markw)
 xiaomi-markw showing neofetch | |
| Manufacturer | Xiaomi |
|---|---|
| Name | Redmi 4 Prime |
| Codename | xiaomi-markw |
| Released | 2016 |
| Type | handset |
| Hardware | |
| Chipset | Qualcomm Snapdragon 625 (MSM8953) |
| CPU | Octa-core 2 GHz Cortex-A53 |
| GPU | Adreno 506 |
| Display | 1080x1920 IPS |
| Storage | 32 GB |
| Memory | 3 GB |
| Architecture | aarch64 |
| Software | |
| Original software | Android (MIUI) |
| Original version | 6.0.1 |
| postmarketOS | |
| Category | community |
| Pre-built images | yes |
| postmarketOS kernel | mainline |
| Flashing |
Works |
|---|---|
| USB Networking |
Works |
| Internal storage |
Works |
| SD card | |
| Battery |
Works |
| Screen |
Works |
| Touchscreen |
Works |
| Multimedia | |
| 3D Acceleration |
Works |
| Audio |
Works |
| Camera |
Partial |
| Camera Flash |
Broken |
| IR TX |
Broken |
| Connectivity | |
| WiFi |
Works |
| Bluetooth |
Works |
| GPS |
Partial |
| Modem | |
| Calls |
Works |
| SMS |
Works |
| Mobile data |
Partial |
| Miscellaneous | |
| FDE |
Broken |
| USB OTG |
Works |
| Sensors | |
| Accelerometer |
Works |
| Magnetometer |
Works |
| Ambient Light |
Partial |
| Proximity |
Works |
| Haptics |
Broken |
| This device is based on the Snapdragon 625. See the SoC page for common tips, guides and troubleshooting steps |
Device Notes
Touch Screens
| Touch Screen | Status |
|---|---|
| atmel,maxtouch | Partial |
| edt,edt-5336 (edt,edt-ft5x06) | Works |
Both variants of touch screen use the same pins, so we can't just enable both drivers at a same time. Starting from 6.7.9, we let lk2nd to enable a device tree node of a touch screen. The touch screen won't work until you update lk2nd. For now, lk2nd can only enable focaltech, so you need to build lk2nd by youself if you have atmel (just comment ft and uncomment atmel in dts/msm8953-xiaomi-markw.dts in the sources)
Modem
Voice calls are working, SMS - untested yet, but should work. Mobile data doesn't work for me (vipaol), but maybe you're lucky.
Cameras
Both sensors are working in megapixels, but camera switching doesn't work for an unknown reason (probably it used to be a bug of megapixels, but now we also have some problems with VFEs in the kernel). The config for megapixels is below: ... Now megapixels have config for markw out of the box.
Sometimes numbers of i2c buses with the cameras can be different (aliases in i2c should help, but the maintainer is lazy) and they should be changed in the config ("media-links" lines).
markw:~$ media-ctl -p | grep -E "s5|ov"
<- "s5k3l8 3-002d":0 [ENABLED,IMMUTABLE]
<- "ov5670 4-0036":0 [ENABLED,IMMUTABLE]
- entity 184: ov5670 4-0036 (1 pad, 1 link)
- entity 186: s5k3l8 3-002d (1 pad, 1 link)
# we can see rear camera on i2c-3, and front on 4
None of vfeX_rdiX other than vfe0_rdi0 will work on recent kernel versions, so we can't use both cameras at a same time because we have only one working "output channel". Also csid2 doesn't work, but csid0 and csid1 work.
Sensors
Connected to i2c-gpio
| Sensor | Model | Status |
|---|---|---|
| Accelerometer/Gyroscope | bosch,bmi120 (bosch,bmi160) | Works |
| Light/Proximity | liteon,ltr559 (liteon,ltr501) | Works |
| Magnetometer | yamaha,yas537 (yamaha,yas530) | Works |
UART
The working voltage is 1.8 V.
Warning: the test points are very small, soldering is not recommended. It's probably better to just hold a wire with a hard thin end with your hands.
How to enter flash mode
[Power] + [Vol-] to fastboot mode
Installation
 |
WARNING: Installation on the internal memory will erase all your data! |
Pre-built images
The device is in community category, so can download a pre-built image.
- You need only "<...>-xiaomi-markw-lk2nd.img.xz" and "<...>-xiaomi-markw.img.xz". lk2nd can boot from a file on the "pmOS_boot" subpartition, so you don't need "<...>-xiaomi-markw-boot.img.xz".
Follow the installation article to download image files. Once downloaded, decompress the files with unxz or any compatible graphical archiver.
Step 1. Flash rootfs:
- - To SD-card
-
- The downloaded rootfs img is a sparse img. You need to convert it to a normal img before flashing it to an SD-card:
$ simg2img <...>-xiaomi-markw.img nonsparse-converted.img - Then just write it using a tool for writing images.
- The downloaded rootfs img is a sparse img. You need to convert it to a normal img before flashing it to an SD-card:
- - To internal memory
-
$ fastboot flash userdata <...>-xiaomi-markw.img
Step 2. Flash lk2nd:
 |
Note: lk2nd is a hard dependency, without it the mainline kernel will not select the display panel and you'll get a black screen. |
$ fastboot flash boot [the file that ends in -lk2nd.img]
lk2nd is a second stage bootloader that is used for some device-specific hacks. It can boot from a file on the "pmOS_boot" subpartition, so we don't need to flash a boot.img.
If you see < waiting for any device >, try running as sudo and restart your device into fastboot mode again.
Manual build
- Do not use "android recovery zip" method, because it can't install lk2nd and have some other problems.
Step 1. Flash rootfs:
- - To SD-card
-
- Find your SD-card:
lsblk - Install (change /dev/sdX to your card)
$ pmbootstrap install --sdcard /dev/sdX
- Find your SD-card:
- - To internal memory
-
$ pmbootstrap install $ pmbootstrap flasher flash_rootfs
Step 2. Flash lk2nd:
|
Note: lk2nd is a hard dependency, without it the mainline kernel will not select the display panel and you'll get a black screen. |
$ pmbootstrap flasher flash_lk2nd
lk2nd boots the kernel from file. Flashing the kernel is not needed
Users owning this device
- ApertureUA (Notes: Green lightsaber stripe in the middle, unlocked with aboot patch)
- Vipaol (Notes: (Ebbg/Atmel) Mainlining.)