Hi, Can someone help me in clarifying my queries ??
Thanks, Ravi Kumar On Mon, Jun 10, 2019 at 3:55 PM Ravi Kumar Siadri < siadriravikumaru...@gmail.com> wrote: > Hi all, > > I have couple of queries regarding the > *EFI_EXT_SCSI_PASS_THRU_ATTRIBUTES_LOGICAL* attribute support in > *EFI_EXT_SCSI_PASS_THRU_PROTOCOL*. > > *1. * > *The Attributes field of the EFI_EXT_SCSI_PASS_THRU_PROTOCOL interface > tells if the interface is for physical SCSI devices or logical SCSI > devices. Drivers for non-RAID SCSI controllers will set both the > EFI_EXT_SCSI_PASS_THRU_ATTRIBUTES_PHYSICAL, and the > EFI_EXT_SCSI_PASS_THRU_ATTRIBUTES_LOGICAL bits.* > > If the Drivers is for non-RAID SCSI controllers why to set the > EFI_EXT_SCSI_PASS_THRU_ATTRIBUTES_LOGICAL bit. Will there be any case that > non-RAID SCSI controllers have Logical devices connected to it ?? > > *2. * > *Drivers for RAID controllers that allow access to the physical devices > and logical devices will produce two EFI_EXT_SCSI_PASS_THRU_PROTOCOL > interfaces: * > *One with the just the EFI_EXT_SCSI_PASS_THRU_ATTRIBUTES_PHYSICAL bit set > and another with just the EFI_EXT_SCSI_PASS_THRU_ATTRIBUTES_LOGICAL bit > set. One interface can be used to access the physical devices attached to > the RAID controller, and the other can be used to access the logical > devices attached to the RAID controller for its current configuration.* > > Any background why EFI_EXT_SCSI_PASS_THRU_PROTOCOL needed 2 instances ? > why can't we install attributes EFI_EXT_SCSI_PASS_THRU_ATTRIBUTES_LOGICAL > and EFI_EXT_SCSI_PASS_THRU_ATTRIBUTES_PHYSICAL on same Instance ?? > How User locates the Instance with > EFI_EXT_SCSI_PASS_THRU_ATTRIBUTES_LOGICAL bit set and Instance with > EFI_EXT_SCSI_PASS_THRU_ATTRIBUTES_PHYSICAL bit set. ?? > > Thanks, > Ravi Kumar > > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#42249): https://edk2.groups.io/g/devel/message/42249 Mute This Topic: https://groups.io/mt/32007447/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
