Re: [Qemu-devel] [PATCH] ahci: fix device detect emulation.

[Gerd Hoffmann <kraxel@redhat.com>]

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