General Mobile E-Tab 4 (gm-mehmet)
| This device has been tested with postmarketOS, but its device package has not yet been added to the postmarketOS repositories. This means that it cannot be selected in pmbootstrap. Status: booting |
 E-tab 4 front | |
| Manufacturer | General Mobile |
|---|---|
| Name | E-Tab 4 (2012) |
| Codename | gm-mehmet |
| Released | 2012 |
| Hardware | |
| Chipset | Samsung Exynos 4412 Quad |
| CPU | Cortex-A9 |
| GPU | Mali-400 MP |
| Display | 800x1280 |
| Storage | 16GB |
| Memory | ~1GB RAM |
| Architecture | armv7 |
| Software | |
Original software  The software and version the device was shipped with. |
Android 4.2.2 |
Extended version The most recent supported version from the manufacturer. |
Android |
Mainline Instead of a Linux kernel fork, it is possible to run (Close to) Mainline. |
no |
Flashing Whether 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). |
Untested
|
Battery Whether charging and battery level reporting work. |
Untested
|
Screen Whether the display works; ideally with sleep mode and brightness control. |
Works
|
Touchscreen |
Untested
|
| Multimedia | |
3D Acceleration |
Untested
|
Audio Audio playback, microphone, headset and buttons. |
Untested
|
Camera |
Untested
|
IR TX |
Untested
|
| Connectivity | |
WiFi |
Untested
|
Bluetooth |
Untested
|
GPS |
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 Handles automatic screen rotation in many interfaces. |
Untested
|
 |
Note: WIP page |
|
Note: Device boot patition size is 10MB but mainline kernel boot.img is 13.3MB. We need decrease size |
Contributors
Users owning this device
How to enter flash mode
Press + to boot into recovery mode (i recommend using TWRP Recovery)
For fastboot, try adb reboot fastboot.
but fastboot maybe broken
Installation
Since it's not currently merged into the Exynos4 kernel, to compile and boot it:
$ make exynos4_defconfig
$ make O=.output
$ pmbootstrap build --envkernel linux-postmarketos-exynos4 --force
for building device images
Clone device package repository into your cache_git/pmaports/device/testing/ . its probably under ~/.local/var/pmbootstrap/ directory.
$ pmbootstrap init #select gm-mehmet
$ pmbootstrap install
We recommend using recovery mode (ex. twrp).
$ pmbootstrap install --android-recovery-zip
Mainline component status
| Element type | Element | Works? | Notes |
|---|---|---|---|
| Chipset | Exynos 4412 | yes | |
| Graphics | Mali-400MP4 | CONFIG_VIDEO_MALI400MP=y CONFIG_USE_LEGACY_MFC=y CONFIG_VIDEO_AS0260=y | |
| PMIC (Regulators) | max77686 | Supported in mainline | |
| Fuel gauge | MAX17040 | Supported by MAX17042 driver | |
| Charger | MAX8903 | Supported in mainline (though no other DTSes use it yet...) | |
| Touchscreen | Focaltech ft5x0x or Atmel MXT1664S | Atmel supported, Focaltech unclear (need exact model number, but should be supported by edt-ft5x06 driver?) | |
| Display | LTN101AL03 | supported in mainline mainline LTN101AL03 patch | |
| Backlight | PWM backlight | Can use the pwm-backlight driver. | |
| Buttons | gpio-keys | Volume up/down and power button. | |
| Audio | WM8985 | The codec itself is supported but we might need more to get it to work. | |
| Camera | ON Semiconductor AS0260 | Not in mainline, | |
| GPS | UBLOX G6010 | Not in mainline | |
| Accelerometer | Bosch BMA150 | Supported in mainline. Oddly enough, downstream handles it in some Yamaha-related driver (grep for YAS_ACC_DRIVER), drivers/input/misc/yas_cfg.h | |
| Magnetometer | Alps HSCDTD007/008 | Downstream sources initially led to Yamaha YAS530, grep for YAS_MAG_DRIVER, drivers/input/misc/yas_cfg.h; but dmesg claims HSCDTD007/008. Either way, supported in mainline. | |
| Light sensor | ISL29023 | Supported in mainline by ISL29018 driver |
Some parts of this have been verified with a MEHMET_HW_VE1 [0x7] revision tablet.
