From: Cong Meng <mc@linux.vnet.ibm.com>
To: ronnie sahlberg <ronniesahlberg@gmail.com>,
Paolo Bonzini <pbonzini@redhat.com>
Cc: zwanp@cn.ibm.com, linuxram@us.ibm.com,
stefanha@linux.vnet.ibm.com, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] add suport for ATA_PASSTHROUGH_xx scsi command
Date: Wed, 01 Aug 2012 16:55:53 +0800 [thread overview]
Message-ID: <5018EF19.7090304@linux.vnet.ibm.com> (raw)
In-Reply-To: <CAN05THSa+H2Zr+=CYdwH6kD8Kof=K_WjkXL-uakunBdB3CzyoQ@mail.gmail.com>
I see. thank both.
On Wed 01 Aug 2012 04:49:18 PM CST, ronnie sahlberg wrote:
> Because opcode 0xA1 has a different meaning for CDROM/MMC devices.
> On such devices 0xA1 means BLANK, so it would collide if QEMU some day
> adds support for
> re-writeable mmc device.
>
>
> On Wed, Aug 1, 2012 at 6:45 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
>> Il 01/08/2012 10:43, Cong Meng ha scritto:
>>>>
>>>> Please make this conditional on the type _not_ being TYPE_ROM.
>>>
>>> May I ask why cdrom device should be an exception?
>>
>> Because CD-ROM devices do not support ATA PASSTHROUGH (the SAT standard
>> only describes direct access devices---type=0x00). The 0xa1 command is
>> "BLANK" for CD-ROMs.
>>
>> Paolo
>>
>
prev parent reply other threads:[~2012-08-01 8:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-01 7:53 [Qemu-devel] [PATCH] add suport for ATA_PASSTHROUGH_xx scsi command Cong Meng
2012-08-01 8:20 ` Paolo Bonzini
2012-08-01 8:43 ` Cong Meng
2012-08-01 8:45 ` Paolo Bonzini
2012-08-01 8:49 ` ronnie sahlberg
2012-08-01 8:55 ` Cong Meng [this message]
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