For the A133, hardware configuration is defined in the Device Tree Source (DTS). Unlike older kernels that relied heavily on sys_config.fex, modern A133 BSPs utilize standard Device Tree syntax.
Here’s a comprehensive review of the Allwinner A133 USB driver from the perspective of developers, firmware engineers, and advanced users working with the A133 platform (typically tablets, embedded Linux, or Android devices).
Linux does not require "drivers" in the Windows sense, but it does require udev rules to grant user access to the A133 USB port. allwinner a133 usb driver
For Allwinner A133 FEL mode:
| Use case | Recommended driver/tool |
|----------|------------------------|
| Custom Linux (host mode) | Mainline dwc2 + sunxi |
| Android development | BSP driver + ADB over USB |
| Flashing firmware (Windows) | Zadig + libusb + sunxi-fel (avoid PhoenixSuit) |
| Flashing firmware (Linux) | sunxi-fel directly |
| Debugging USB issues | Enable dwc2 debugfs or usbmon | For the A133, hardware configuration is defined in
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.
| Problem | Cause | Fix |
|---------|-------|-----|
| Windows fails to install driver | Missing signature | Disable driver signing or use Zadig to install libusb‑win32 |
| Device disconnects during flashing | Power drop in OTG cable | Use powered USB hub |
| No FEL detected | Wrong button sequence | Check schematic: usually FEL = VOL+ or LID open while powering |
| ADB not working in Android | Wrong gadget config | Enable adb in kernel config (CONFIG_USB_CONFIGFS_F_ADB) |
| USB host port dead | Missing VBUS regulator in DT | Add usb0_vbus_power-supply in device tree | Linux does not require "drivers" in the Windows
One of the most complex aspects of the A133 USB driver is the Dual-Role Switching.
Verdict: Mainline is reliable for host mode. For gadget/OTG, BSP can be less buggy on some boards.
