If sunHwCtrlTpmForceClear and sunHwCtrlTpmEnable are both currently true(1) during a host power on event, the TPM device state will be purged and the state of sunHwCtrlTpmForceClear will return to false(2). If sunHwCtrlTpmForceClear is currently true(1) and sunHwCtrlTpmEnable is currently false(2) during a host power on event, the TPM device will not be enabled, no action is taken with regard to the state of the TPM device, and sunHwCtrlTpmForceClear remains true(1). If sunHwCtrlTpmForceClear is currently false(2) and sunHwCtrlTpmEnable is currently true(1) during a host power on event, the TPM device will be enabled, no action is taken with regard to the state of the TPM device, and sunHwCtrlTpmForceClear remains false(2). When sunHwCtrlTpmEnable is set to false(2), no changes to sunHwCtrlTpmForceClear will succeed.