I tried this, but many of current platform does not seem to implement the
creation of Block I/O from ExtSCSIPassthru. If I don't install Block I/O, I
don't see my drives available for OS installation.
So is this mandatory for the SCSI HBA Drivers to install Block I/O by
themselves?
Thanks
sathya
From: Kinney, Michael D [mailto:[email protected]]
Sent: Monday, March 11, 2013 1:07 PM
To: [email protected]
Subject: Re: [edk2] Block I/O installation by SCSI host driver driver or
Platform?
Sathya,
The UEFI Spec 2.3.1 Section 2.6.3 Item #14 says you are only required to
produce the EFI_EXT_SCSI_PASS_THRU_PROTOCOL.
Section 2.6.2 Item #12 requires the platform to carry the rest of the services
to produce Block I/O from EFI_EXT_SCSI_PASS_THRU_PROTOCOL.
If you have both physical and logical SCSI channels, then you are only required
to produce handles with the EFI_EXT_SCSI_PASS_THRU_PROTOCOL for the logical
channel. RAID controllers can optionally produce handles for the physical
channels.
Mike
From: Prakash, Sathya [mailto:[email protected]]
Sent: Monday, March 11, 2013 11:20 AM
To: [email protected]<mailto:[email protected]>
Subject: [edk2] Block I/O installation by SCSI host driver driver or Platform?
Folks,
I was going through the driver writers guide and in section 20.1.1
Single-Channel SCSI Adapters I found the below mentioned description
Because there is only one SCSI channel, the SCSI driver can simply implement
one instance of the Extended SCSI Pass Thru Protocol. The platform firmware
provides the
SCSI Bus Driver and SCSI Disk Driver that complete the driver stack by
performing the following actions:
* Scan for SCSI targets on the SCSI channel and create child handles.
* Install Device Path Protocol to each child handle.
* Install SCSI I/O Protocol to each child handle.
* Install I/O abstraction such as the Block I/O Protocol to each child handle.
My question is: Do the SCSI host controller driver needs to install Block I/O
protocol on the controller handle or is it not required? If we have RAID
controller do I need to install Block I/O protocol on both the physical and
logical channels I create in my driver. The reason for the confusion is I
don't see a need of installing Block I/O protocols from host driver if the
platform provides that for each devices exposed by our host driver. But I see
so far the Block I/O must be installed by my driver for the SCSI devices
attached to my controller.
Am I missing something?
Thanks
Sathya
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