hi, Experts: i am studying ACPI 5.0 spec. i have some questions about SPB controller drivers. 1. Generic Serial Bus Protocol SPB controller vendors will provide SPB controller device drivers to OS vendor. And AML will utilize this device driver to implment gerneric serial bus protocol's interface functions? Is there a sample? 2. I2C/SPI/SMBUS controller drivers should exist in OS? Does OSPM not include these drivers? best wishes,