Re: [Qemu-devel] [PATCH] ATA: Allow WIN_SECURITY_FREEZE_LOCK as nop

[Kevin Wolf]

Am 09.02.2012 15:49, schrieb Alexander Graf:
> 
> On 09.02.2012, at 15:28, Kevin Wolf wrote:
> 
>> Am 30.01.2012 23:29, schrieb Alexander Graf:
>>> When using Windows 8 with an AHCI disk drive, it issues a blue screen.
>>> The reason is that WIN_SECURITY_FREEZE_LOCK / CFA_WEAR_LEVEL is not
>>> supported by our ATA implementation, but Windows expects it to be there.
>>
>> Is there anything that makes Windows believe that we support it? The
>> spec says bits in IDENTIFY word 82 and 128 must be set to indicate
>> support for the security feature set, and we don't set those.
>>
>> Might be just a Windows bug, of course...
> 
> IIUC it's mandatory in more recent ATA versions, so that's probably why it 
> assumes it's there.

ACS-2 says it's optional for both ATA and ATAPI devices.

Kevin