Verify Host Controller and Allocate Resources Sample Clauses

Verify Host Controller and Allocate Resources. The Host Controller Driver checks the Revision field in the HcRevision register to verify the HC’s interface is compatible with the Host Controller Driver. When checking the Revision, the Host Controller Driver must mask the rest of the bits in the HcRevision register as they are used to specify which optional features that are supported by the HC. The Host Controller Driver then allocates and initializes any Host Controller structures, including the HCCA block, and operating system structures it needs. Upon success, the Host Controller Driver retains the noncached virtual address of the operation register block in its device data.