You can search for "Intel Serial IO Driver" directly on Intel's download center. Ensure you select the version compatible with your version of Windows (10 or 11) and your system architecture (usually 64-bit).

If you encounter this device in an unknown state, do not panic. Install the Intel Serial IO driver, reboot, and watch the yellow exclamation mark vanish—replaced by a fully functional peripheral bus.

If you are compiling your own kernel (common for Arch or Gentoo users), ensure you have support enabled. Specifically, look for: CONFIG_X86_INTEL_LPSS CONFIG_MMC_SDHCI_ACPI

On Linux, the ACPI 80860F14 device is almost always supported by the kernel module i2c_designware_platform . If it is not loading:

Fresh installations of Windows (especially Windows 10/11 without manufacturer recovery media) lack the proprietary Intel Serial IO drivers. Windows Update may find them eventually, but manual installation is faster.