A Q8 style cheap tablet, but with an A33 SoC.

Identification

Oysters T74ER
Manufacturer	Manufacturer
Dimensions	190.7mm x 115.7mm x 11.7mm
Release Date	23/03/2015
Website	Device Product Page
Specifications
SoC	A33 @ 1.3Ghz
DRAM	512MiB DDR3 @ 400MHz
NAND	4GB
Power	DC 5V @ 1A, 2000mAh 3.7V Li-Ion battery
Features
LCD	1024x600 (7" 16:9)
Touchscreen	X-finger capacitive/resistive (Manufacturer device)
Audio	3.5mm headphone plug, 3.5mm microphone plug, internal mono speaker, internal microphone
Network	WiFi 802.11 b/g/n
Storage	µSD
USB	1 USB2.0 OTG
Camera	??.?MP (????x????) front, ??.?MP (????x????) rear
Headers	LCD

This section explains how to most easily identify your device. For a development board, explain the name(s) printed on the board. For an android device, find out the strings as reported under settings.

On the back of the device, the following is printed:

Tablet PC I T74ER

The PCB has the following silkscreened on it:

AL-AX3-751S_V1.5
2015.03.23

In android, under Settings->About Tablet, you will find:

Model Number: DEVICE
Build Number: Oysters_T74ER_SA002_08092015

Sunxi support

Current status

Mainline U-boot OK from SD.

Mainline kernel started but usb and drm don't work

Mainline U-Boot

Use the q8_a33_tablet_1024x600_defconfig build target.

In new versions of U-Boot, USB-OTG power supply does not work. Use a USB hub with active power supply, or an old U-Boot

Linux Kernel

Mainline kernel

Use the sun8i-a33-q8-tablet.dtb device-tree binary.

To work with GPU acceleration, apply this old patch. Worked in 2022.

Patch file (click on the 'Expand' link to see it):

diff --git a/arch/arm/boot/dts/sun8i-a23-a33.dtsi b/arch/arm/boot/dts/sun8i-a23-a33.dtsi
index 4461d5098..81c694c55 100644
--- a/arch/arm/boot/dts/sun8i-a23-a33.dtsi
+++ b/arch/arm/boot/dts/sun8i-a23-a33.dtsi
@@ -284,7 +284,7 @@ usb_otg: usb@1c19000 {
 			phys = <&usbphy 0>;
 			phy-names = "usb";
 			extcon = <&usbphy 0>;
-			dr_mode = "otg";
+			dr_mode = "host";
 			status = "disabled";
 		};
 
diff --git a/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts b/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
index 9c5750c25..f37b8cdc2 100644
--- a/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
+++ b/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
@@ -49,9 +49,21 @@ / {
 	compatible = "allwinner,q8-a33", "allwinner,sun8i-a33";
 };
 
+&panel {
+	compatible = "oysters,1024-600", "simple-panel";
+};
+
 &tcon0_out {
 	tcon0_out_lcd: endpoint@0 {
 		reg = <0>;
 		remote-endpoint = <&panel_input>;
 	};
 };
+
+&sound {
+	status = "okay";
+};
+
+&codec {
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi b/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi
index 872d56caa..5f9ca7abe 100644
--- a/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi
+++ b/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi
@@ -208,7 +208,7 @@ &simplefb_lcd {
 };
 
 &usb_otg {
-	dr_mode = "otg";
+	dr_mode = "host";
 	status = "okay";
 };
 
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 9e46db5e3..fcc60550e 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -3651,6 +3651,28 @@ static const struct panel_desc arm_rtsm = {
 	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
 };
 
+static const struct drm_display_mode oysters_1024_600_mode = {
+	.clock = 51000,
+	.hdisplay = 1024,
+	.hsync_start = 1024 + 160,
+	.hsync_end = 1024 + 160 + 1,
+	.htotal = 1024 + 160 + 1 + 159,
+	.vdisplay = 600,
+	.vsync_start = 600 + 12,
+	.vsync_end = 600 + 12 + 1,
+	.vtotal = 600 + 12 + 1 + 22,
+};
+
+static const struct panel_desc oysters_1024_600 = {
+	.modes = &oysters_1024_600_mode,
+	.num_modes = 1,
+	.bpc = 6,
+	.size = {
+		.width = 154,
+		.height = 86,
+	},
+};
+
 static const struct of_device_id platform_of_match[] = {
 	{
 		.compatible = "ampire,am-1280800n3tzqw-t00h",
@@ -3709,6 +3731,9 @@ static const struct of_device_id platform_of_match[] = {
 	}, {
 		.compatible = "bananapi,s070wv20-ct16",
 		.data = &bananapi_s070wv20_ct16,
+	}, {
+		.compatible = "oysters,1024-600",
+		.data = &oysters_1024_600,
 	}, {
 		.compatible = "boe,hv070wsa-100",
 		.data = &boe_hv070wsa

Tips, Tricks, Caveats

Add MANUFACTURER DEVICE specific tips, tricks, Caveats and nice to have changes here.

FEL mode

The Volume+ button triggers FEL mode.

Device specific topic

If there are no further device specific topics to add, remove these sections.

...

Adding a serial port (voids warranty)

DEVICE UART pads

This section explains how to attach a serial port to the device. Make sure it refers to our UART howto. For a development board, you can just mention how to find the header with the pins and include a picture, and you can remove the warranty voiding warning.

Device disassembly

If necessary, provide a short description of how to open the device. Perhaps explain how the pins can be most easily popped. If pins do need to be popped, mention the Plastic tool howto.

Locating the UART

Describe how to find the RX,TX,GND signals here, and mention the UART howto.

Adding USB Host port

This device has an empty USB Host pad near the Wi-Fi chip. Don't forget to enable CONFIG_USB_EHCI_GENERIC in u-boot

Pictures

Take some pictures of your device, upload them, and add them here. DO NOT UPLOAD PICTURES WHICH YOU PLUCKED OFF THE INTERNET.

Schematic

List schematics, board layout, cad files, etc here.

Also known as

List rebadged devices here.

Oysters T74ER

Contents