Allwinner A133 USB Driver Guide: Connecting Your Device Allwinner A133
is a common quad-core processor found in many budget Android tablets. To perform advanced tasks like flashing new firmware, rooting, or using ADB (Android Debug Bridge), your computer needs the correct USB drivers to recognize the chip in its specialized "FEL" or "Download" modes. 1. Types of Drivers Needed
Depending on what you are trying to do, you may need one of two driver types: FEL/Flashing Driver:
Required for "unbricking" or installing full operating system images using tools like PhoenixSuit ADB/VCOM Driver:
Used for communicating with the tablet while it is powered on (e.g., for file transfers or app debugging). 2. How to Install Allwinner USB Drivers
For most Windows users, the easiest way to get these drivers is through Allwinner's official production tool suite. Download the Tool Center: Allwinner's APST (Allwinner Product Selection Tool) often includes the necessary drivers automatically. Manual Installation via Device Manager: Put your tablet into
(usually by holding a specific button like 'Volume +' while connecting the USB cable to your PC). Device Manager on your computer. Look for an "Unknown Device" "USB Device(VID_1f3a_PID_efe8)" Right-click it and select Update Driver Browse my computer for driver software
Point the installer to the driver folder found within your flashing tool's directory (e.g., inside the PhoenixSuit 3. Common Connection Issues allwinner a133 usb driver
If your computer still doesn't see the Allwinner A133 device: Cable Quality:
Many cheap micro-USB or USB-C cables are for charging only and lack data wires. Use the original cable if possible. USB 3.0 Incompatibility:
Some older Allwinner flashing tools struggle with USB 3.0 (blue) ports. Try using a USB 2.0 port or a USB hub. Driver Signature Enforcement: On Windows 10 and 11, you may need to disable Driver Signature Enforcement temporarily to install "unsigned" Allwinner drivers. 4. Technical Specifications
For developers working on custom Linux kernels or U-Boot for the A133, the SoC features: Dual USB 2.0 Interfaces: One dedicated USB Host and one USB OTG (On-The-Go) port. Supported OS: Primarily designed for Android 10.0 and above. Are you looking to flash a specific firmware or are you trying to debug an app using ADB? Development & Production Tools - D1-H (en)
The Allwinner A133 (sun50iw10) is a quad-core 64-bit ARM Cortex-A53 SoC designed for tablets and smart displays. Its USB subsystem features a highly integrated architecture supporting both Host and On-The-Go (OTG) functionalities. Technical Architecture of A133 USB The A133 SoC incorporates two USB 2.0 interfaces:
USB OTG (Port 0): This port supports dual-role functionality, allowing the device to act as either a USB Host or a USB Peripheral. In development environments, it is primarily used for FEL (Full Engine Loading) mode, enabling firmware flashing and low-level debugging.
USB Host (Port 1): A dedicated interface typically used for connecting external peripherals such as keyboards, mice, or mass storage devices. Driver Ecosystem and Implementation Allwinner A133 USB Driver Guide: Connecting Your Device
The driver stack for the Allwinner A133 varies significantly depending on the host operating system and development stage: 1. Linux Mainline Support
While earlier Allwinner chips have mature support, the A133 is still undergoing active mainlining.
USB Host: In the Linux kernel, the USB Host functionality typically relies on standard EHCI (Enhanced Host Controller Interface) and OHCI (Open Host Controller Interface) drivers.
USB OTG/MUSB: The OTG port often utilizes the sunxi-musb driver or a dedicated PHY driver (sun4i-usb-phy) to manage power and data signaling.
U-Boot Integration: Early-stage USB initialization is handled by Mainline U-Boot, which provides the sunxi-fel tool compatibility required for booting over USB without an SD card. 2. Android and BSP Drivers The A133 is natively designed for Android 10.0 and above.
ADB Drivers: For Windows-based development, the Android WinUsb driver (often customized by Softwinner) is essential for enabling the Android Debug Bridge (ADB) interface.
LiveSuit/PhoenixSuit: These proprietary Allwinner tools utilize a specific awusb.ko or specialized Windows USB driver to communicate with the SoC's bootloader during flashing procedures. Linux mainlining effort - linux-sunxi.org SoC: Allwinner A133 — low-cost ARM SoC in
Allwinner A133-based devices, common in entry-level Android tablets, require specific USB drivers for ADB debugging or FEL-mode firmware flashing, often relying on standard Android USB drivers or specialized flashing tool drivers. For manual installation, the required .inf files for ADB are available, while FEL mode drivers are typically installed through tools like PhoenixSuit or by managing Windows driver signatures. For a direct download of necessary driver files, visit allwinner-tools GitHub
Below is a representative structure of the A133 OTG node in the DTS:
usb_otg: usb@5100000
compatible = "allwinner,sun50i-a133-otg", "snps,dwc2";
reg = <0x05100000 0x10000>;
interrupts = <GIC_SPI 23 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&ccu CLK_BUS_OTG>;
resets = <&ccu RST_BUS_OTG>;
dr_mode = "otg"; /* Options: "host", "peripheral", "otg" */
g-rx-fifo-size = <256>;
g-np-tx-fifo-size = <32>;
g-tx-fifo-size = <128 128 128>;
status = "okay";
;
In OTG mode, the driver must know the state of the ID pin (to distinguish Host vs. Device) and control VBUS (5V power output).
extcon (External Connector) framework to detect cable insertion type.lsusb to see if device appears.dmesg | tail -n 50 after connecting for kernel messages.uname -a for kernel version.cat /proc/cpuinfo and cat /proc/driver/usb (if present).
Assumption: If the device shows no USB entries, it's likely gadget not enabled or wrong DT bindings.For developers targeting the A133, a stable ADB driver is essential. Use adb logcat to capture real-time system logs and adb shell dmesg to check kernel-level USB activity.
If you are working with an A133 board and struggling with USB connectivity, here is a diagnostic checklist:
lsusb (Linux) or USB Device Viewer (Windows). Look for 1f3a (Allwinner vendor ID).sunxi-tools and run sudo sunxi-fel version. If you see a version string, your “driver” (libusb) is working.1f3a:efe8 device, and install the libusb-win32 or WinUSB driver. Then use sunxi-fel.exe from a Cygwin or WSL environment.The Physical Layer (PHY) is a critical component in the A133. It handles the low-level analog signaling. The A133 utilizes an internal High-Speed PHY.
USBPHY_CTRL area.