WEXLER Tab 7t (wexler-qc750)

From postmarketOS Wiki
Note This device is supported as part of a generic port. Refer to Nvidia Tegra armv7 (nvidia-tegra-armv7) for installation instructions and more information.
WEXLER Tab 7t
Booted tablet with lxqt
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 Android
Original version 4.2.2
FOSS bootloader yes
postmarketOS
Category testing
Pre-built images no
Mainline yes
postmarketOS kernel downstream 3.1.10, mainline 6.6.22
Unixbench Whet/Dhry score 1161.4
Generic port Nvidia Tegra armv7 (nvidia-tegra-armv7)
Features
Flashing
Works
USB Networking
Works
Internal storage
SD card
Battery
Screen
Works
Touchscreen
Works
Multimedia
3D Acceleration
Audio
Camera
Connectivity
WiFi
Bluetooth
GPS
NFC
Modem
Calls
SMS
Mobile data
Miscellaneous
FDE
USB-A
Works
USB OTG
Works
HDMI/DP
Sensors
Accelerometer
Magnetometer
Ambient Light
Proximity
Hall Effect
Barometer
Power Sensor
U-Boot
Primary Bootloader
Works
Secondary Bootloader
Broken
Mainline
Works
Internal Storage
Works
SD card
Works
USB Host
Works
USB Peripheral
Works
Display
Works
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 Volume Up + Power keys, with Volume Down move selection to Fastboot Protocol, then choose it by pressing Volume Up.

APX: Press Volume Up + Power keys, with Volume Down move selection to Forced Recovery, then choose it by pressing Volume Up.

Mainline status

Note 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

Note 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

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