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docs: explain hardware branch selection

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Shen Mintao
2026-07-25 15:29:46 +08:00
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# AIC8800D80 Linux Driver
This driver is for the AIC8800D80 chipset, supported by devices such as the Tenda U11 and AX913B.
> [!IMPORTANT]
> **Choose the branch for your hardware revision before installing.** If the
> driver log reports `chip_id=7, chip_mcu_id=1` on an AIC8800D80 or
> AIC8800DC/DW device, use the
> [`legacy-mcu1`](https://github.com/shenmintao/aic8800d80/tree/legacy-mcu1)
> branch. It contains the matched legacy firmware and loader profile required
> to avoid the deterministic firmware upload timeout at `0x170400`. Use
> `main` when `chip_mcu_id=0` or when the MCU revision is unknown.
>
> Hardware revision takes precedence over the Bluetooth feature branch. MCU1
> devices should remain on `legacy-mcu1`, which initializes Bluetooth for the
> kernel's standard `btusb` driver. After switching branches, rerun
> `sudo ./install.sh` and reboot; switching the Git branch alone does not
> replace the firmware already installed under `/lib/firmware`.
Added support for devices with Vendor ID 368B (tested).
Tested on Linux kernel 6.16 with Ubuntu 25.04 and 6.1.0.27 with Debian 12.