On 06/23/11 15:59, Gerd Hoffmann wrote:
AHCI specs say about the device detection field:Device Detection (DET): Indicates the interface device detection and Phy state. 0h - No device detected and Phy communication not established 1h - Device presence detected but Phy communication not established 3h - Device presence detected and Phy communication established 4h - Phy in offline mode as a result of the interface being disabled or running in a BIST loopback mode The "Software Initilaization" section also mentions "If PxSSTS.DET returns a value of 1h or 3h when read, then system software shall continue to the next step, ..." This makes me think that 1h means "tried to detect device but didn't found one" and 0h means "device detection not finished yet".
/me was thinking wrong, scratch that, qemu behavior is fine. cheers, Gerd
