WEXLER Tab 7t (wexler-qc750)
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| This page is about the dedicated port of this device. There is also an optional generic port available for this device - see Nvidia Tegra armv7 (nvidia-tegra-armv7). | 
| This device runs a Downstream kernel. Some UIs will not work, and most features (3D acceleration, audio, etc.) may be broken. | 
|  Booted tablet with lxqt | |
| Manufacturer | WEXLER | 
|---|---|
| Name | Tab 7t | 
| Codename | wexler-qc750 | 
| Released | 2012 | 
| Type | tablet | 
| Hardware | |
| Chipset | Nvidia Tegra 3 (T30L) | 
| CPU | Quad-core 1.3 GHz Cortex-A9 | 
| GPU | NVIDIA ULP GeForce GPU 12 cores | 
| Display | 1280x800 IPS LCD | 
| Storage | 8, 16, 32 GB | 
| Memory | 1 GB DDR3L | 
| 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 | 
| FOSS bootloader | yes | 
| 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. | downstream 3.1.10, mainline 6.6.22 | 
| Unixbench score Unixbench Whetstone/Dhrystone score. See Unixbench. | 1161.4 | 
| Optional Generic Port | Nvidia Tegra armv7 (nvidia-tegra-armv7) | 
| Device package |  device-wexler-qc750 | 
| Kernel package |  linux-wexler-qc750 | 
| Flashing Whether it is possible to flash the device with  pmbootstrap flasher. | Works | 
|---|---|
| USB Networking After connecting the device with USB to your PC, you can connect to it via telnet (initramfs) or SSH (booted system). | Works | 
| Battery Whether charging and battery level reporting work. | Untested | 
| Screen Whether the display works; ideally with sleep mode and brightness control. | Works | 
| Touchscreen | Works | 
| Multimedia | |
| 3D Acceleration | Untested | 
| Audio Audio playback, microphone, headset and buttons. | Untested | 
| Camera | Untested | 
| Connectivity | |
| WiFi | Untested | 
| Bluetooth | Untested | 
| GPS | Untested | 
| NFC Near Field Communication | Untested | 
| Modem | |
| Calls | Untested | 
| SMS | Untested | 
| Mobile data | Untested | 
| Miscellaneous | |
| FDE Full disk encryption and unlocking with unl0kr. | Untested | 
| USB-A Whether the full-sized USB-A port works. | Works | 
| USB OTG USB On-The-Go or USB-C Role switching. | Works | 
| HDMI/DP Video and audio output with HDMI or DisplayPort. | Untested | 
| Sensors | |
| Accelerometer Handles automatic screen rotation in many interfaces. | Untested | 
| Magnetometer Sensor to measure the Earth's magnetism | Untested | 
| Ambient Light Measures the light level; used for automatic screen dimming in many interfaces. | Untested | 
| Proximity | Untested | 
| Hall Effect Measures magnetic fields; usually used as a flip cover sensor | Untested | 
| Barometer Sensor to measure air pressure | Untested | 
| Power Sensor Sensor to monitor current, voltage and power. Not fuel gauge! | Untested | 
| Primary Bootloader Whether it is possible to replace stock bootloader with U-Boot. | Works | 
|---|---|
| Secondary Bootloader Whether it is possible to chainload U-Boot from stock bootloader. | Broken | 
| Mainline Whether latest upstream versions of U-Boot are not broken and it is possible to use them. | Works | 
| Internal Storage Whether it is possible to boot from internal storage (e.g. eMMC or UFS). | Works | 
| SD card Whether it is possible to boot from SD card. | Works | 
| USB Host Whether it is possible to boot from a USB storage or connect a keyboard. | Works | 
| USB Peripheral Whether it is possible to use device as a peripheral in U-Boot, e.g. for fastboot mode. | Works | 
| Display | Works | 
| Buttons Whether it is possible to navigate in boot menu or grub with volume and power buttons. | Works | 
Notes
- Device SoC is similar to SoC in Google Nexus 7 2012 and Google Nexus 7 2012 GSM
- OTG available - full support, connect and disconnect, at least USB keyboard-mouse and USB drives partially (full USB port, working only when device connected before booting)
- Battery charges (at least not discharges while OS work). Somehow reports status only in xfce4.
- Device have 3G modem (not working?)
- MiniHDMI port available (not working?)
- I accidentally broke my touchscreen connector on the motherboard, so I'm working with wireless USB keyboard-mouse now
Tested environments
- xfce4: works better than other environments, but still have some issues
- lxqt: works fine, can't manage to reboot or power off in UI, doing through terminal
- console: works with connected wireless USB keyboard-mouse
- fbkeyboard: works, can't test touchscreen
Any other UIs is not working, or I can't get them to work for now.
How to enter flash mode
fastboot: Press  +  keys, with  move selection to Fastboot Protocol, then choose it by pressing .
APX: Press  +  keys, with  move selection to Forced Recovery, then choose it by pressing .
Mainline status
| This part is in development. | 
Tablet boots mainline kernel 6.6.22 https://gitlab.com/grate-driver/linux, adaptation is going on in forked tree https://gitlab.com/DX37/linux/-/tree/wexler-qc750
| Status | Hardware | Info | 
|---|---|---|
| P | Booting | Mainline kernel boots with U-Boot, so it needs to be placed in pmOS_boot partition on microSD card. Can be in theory loaded from eMMC boot partition, but grate kernel is bigger, than old downstream kernel, and surpasses 8 Mb partition size. Needs testing. | 
| P | Bootloader | Open source bootloader U-Boot is available as alternative for vendor bootloader and can replace it, but starts only sometimes. | 
| Y | Panel | Chunghwa CLAA070WP03XG LVDS simple panel. | 
| Y | Backlight | Simple pwm-backlight GPIO backlight. Working and even manageable in xfce4. | 
| P | miniHDMI output | Maximum output is 1920x1080. Needs manual detection by opening Display settings (in xfce4). No audio. | 
| ? | Touchscreen | Novatek NT11003 with nt1103-ts driver. Worked in downstream kernel, but can't test it in mainline since I broke touchscreen connector on the motherboard. | 
| Y | microUSB & Full size USB | Works. USB storage and USB peripherals are working (using USB keyboard-mouse kit instead of touchscreen). | 
| Y | Internal memory | eMMC 8 Gb, but can be 16 or even 32 Gb. | 
| ? | GPS | Not tested yet. | 
| ? | WiFi | Not tested yet, possibly wl12xx driver. | 
| ? | Bluetooth | SD8787? Not tested yet. | 
| P | GPIO keys | There is 3 keys on GPIO: Power, Volume up, Volume down. Power key responding only to holding for force poweroff. | 
| ? | GPIO led | There's only one GPIO led for charging state. Not tested yet, possibly works only on low-level hardware. | 
| Y | Battery | TI BQ27500, works. | 
| ? | Charger | TI BQ24160, not tested yet. | 
| Y | PMIC | Maxim MAX77663 PMIC. | 
| P | Sound | TI TLV320AIC3206, headphones and speakers sound is working, can't test microphone (guess still need UCM for that and speakers/headphones switching). | 
| ? | Thermal sensor | NCT1008 ON Semiconductor, not tested yet. | 
| P | Orientation sensors | Magnetometer Asahi-Kasei AK8975 and accelerometer Kionix KXTF9 seems to be working. Gyroscope Invensense MPU3050 does not. | 
| ? | Light sensor | ISL29018? ISL29028? Not tested yet. | 
| ? | Front camera | GC0308, not tested yet. | 
| ? | Rear camera | T8EV5, not tested yet. | 
| ? | Modem | usi_3g? Not tested yet. | 
| P | Graphics support | 2D acceleration works with xf86-video-opentegra (Nvidia_Tegra#GPU). | 
U-Boot
| This part is in development. | 
Current U-Boot status (in development by Clamor):
| Status | Feature | Info | 
|---|---|---|
| P | Primary bootloader | U-Boot can be loaded with patched nvflash (tegra30_debrick) through APX (Forced Recovery), but after flashing starting only sometimes. Created bricksafe.img successfully restores vendor bootloader (and original ROM flash, of course). | 
| ? | Secondary bootloader | U-Boot chainloading from both /boot and /recovery partitions not tested. | 
| Y | Panel | LVDS simple panel works. | 
| Y | MicroSD | Fully functional and detectable. Can be used as boot source. Can be mounted from U-Boot. | 
| Y | eMMC | Fully functional and detectable. Can be used as boot source. Can be mounted from U-Boot. | 
| Y | Boot kernel | Yes, and can be highly adjusted with extlinux.conf. | 
| ? | Boot menu | Not tested. | 
| ? | Power management | Not tested. | 
| P | Fastboot | Not fully tested. | 
| ? | Bricksafe hook (legacy) | Not tested. | 
| ? | Boot Android | Not tested and possibly not working. | 
| ? | Self update | Not tested. | 
Contributors
Maintainer(s)
Users owning this device
- DragonX256 (Notes: Tegra 3 tablet, close to mainline kernel)
- Shipa (Notes: all clips are broken, a bit quirky)
See also
- This SoC has mainline support
- Using this old 3.1.10 kernel, built with gcc6: https://github.com/DmitryADP/morpheus_kernel_wexler_qc750
- Device related build files
- Possibly full device related source files
- Some nice photos on Reddit
- Photos on Reddit about getting UART debug ready
- pmaports!1742 Initial merge request