If you are speaking "Asynchronous Notification" feature defined in AHCI 1.1 
spec section 10.10, EDKII ATA driver doesn't support/use this feature.
The stack will poll ATAPI device media status by sending TEST_UNIT_READY before 
each media access.

Thanks
Feng

-----Original Message-----
From: Reza Jelveh [mailto:[email protected]] 
Sent: Monday, June 23, 2014 18:13
To: Tian, Feng
Cc: [email protected]
Subject: Re: [edk2] OvmfPkg: problems getting ahci mode working with 
satacontroller

On 23/06/14 11:46, Reza Jelveh wrote:
> On 23/06/14 08:30, Tian, Feng wrote:
> > Reza,
> > 
> > For SerialATA Revision 3.2 golden spec, it's in section 11.8 :-).
> 
do async notifications use the d2h register or are they sent differently?

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