Wexler TAB A720

= Identification =

On the back of the device, the following is printed: WEXLER.TAB A720

The PCB has the following silkscreened on it: A23_M7085_L_V02 2014_C5_29

In android, under Settings->About Tablet, you will find:
 * Model Number: TAB A720
 * Build Number: TAB A720_20141115_3.2.0_INT

= Sunxi support =

Current status
Unsupported in mainline kernel, mostly because of non-standard LCD (but really i don't know).

Patches for kernel and U-Boot can be found in this repository: https://gitlab.com/ariarolin/sunxi-wexler-tab-a720

Tested and working with patches:
Display

U-Boot v2021.07

Kernel 5.14.0 (commit 78e709522d2c012cb0daad2e668506637bffb7c2)

DTB

SDcard

USB OTG

Brightness

Hardware keys

Mali / lima (GPU)

Audio (by default speaker is off, enable it by uncommenting in device tree)

Touchscreen (use this firmware https://gitlab.com/ariarolin/sunxi-wexler-tab-a720/-/blob/master/firmware/gsl1680-wexler-taba720.fw)

(my xorg.conf.d (calibration) for touchscreen is here: https://gitlab.com/ariarolin/sunxi-wexler-tab-a720/-/tree/master/touchscreen_config/xorg.conf.d)

Working but with problems:
Wifi - use this kernel module https://github.com/Icenowy/esp8089/tree/cleanup (Known problem - cannot connect to hidden SSID, not tested with normal)

Not working:
Cedrus (hardware media acceleration)

Rotation

Accelerometer (it's mxc622x, no known driver for mainline)

Camera

Problems encountered:


 * 1) Kernel 5.14.0 does not shutdown fully (screen is off but power is on) (on 5.8.0 all OK)

Android modules
gslX680new 134112 0 - Live 0x00000000 (F) mxc622x 4025 0 - Live 0x00000000 rtl8150 8115 0 - Live 0x00000000 mcs7830 4948 0 - Live 0x00000000 qf9700 5188 0 - Live 0x00000000 asix 12322 0 - Live 0x00000000 sunxi_keyboard 2749 0 - Live 0x00000000 sw_device 12200 0 - Live 0x00000000 vfe_v4l2 217660 0 - Live 0x00000000 gc0308 9360 1 - Live 0x00000000 vfe_subdev 3827 2 vfe_v4l2,gc0308, Live 0x00000000 vfe_os 3175 2 vfe_v4l2,vfe_subdev, Live 0x00000000 cci 2954 1 gc0308, Live 0x00000000 videobuf_dma_contig 3821 1 vfe_v4l2, Live 0x00000000 videobuf_core 15500 2 vfe_v4l2,videobuf_dma_contig, Live 0x00000000 leds_sunxi 1279 0 - Live 0x00000000 mali 179969 15 - Live 0x00000000 (O) lcd 7184 0 - Live 0x00000000 disp 1045213 8 mali,lcd, Live 0x00000000 nand 256473 8 - Live 0x00000000 (O)

Manual build
You can build things for yourself by following our Manual build howto and by choosing from the configurations available below.

Mainline U-Boot
For unknown reason, git u-boot is not working with tablet, use v2021.07 release

First, apply this patch: https://gitlab.com/ariarolin/sunxi-wexler-tab-a720/-/blob/master/patches/U-BOOT_0001-Add-Wexler-TAB-A720-support.patch

Then, use the Wexler_TAB_A720_defconfig build target.

Mainline kernel
First, apply this patch: https://gitlab.com/ariarolin/sunxi-wexler-tab-a720/-/blob/master/patches/LINUX_0001-Add-Wexler-TAB-A720-support.patch

Then, use the sun8i-a23-wexler-tab-a720.dtb device-tree binary.

FEL mode
With SD card: https://linux-sunxi.org/FEL#Through_a_special_SD_card_image

I do not tried search FEL buttons.

= Adding a serial port (voids warranty) =



Device disassembly
See the Q8 tablet format disassembly page.

Locating the UART
= Pictures =