WEXLER Tab 7t (wexler-qc750)
Appearance
| 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 |
|
| Kernel package |
|
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