More info on revision2 and revision3 of EFI_BLOCK_IO_PROTOCOL

More info on revision2 and revision3 of EFI_BLOCK_IO_PROTOCOL

[jabir]

Hi All,

EFI_BLOCK_IO_MEDIA has two new fields, LowestAlignedLba and
LogicalBlocksPerPhysicalBlock, added in the revision2 and a field
OptimalTransferLengthGranularity added in revision3 of
EFI_BLOCK_IO_PROTOCOL.
Couldn’t find more info from https://github.com/tianocore/edk2.

Please help to understand how these fields are consumed by the system
firmware?

typedef struct {
UINT32 MediaId;
BOOLEAN RemovableMedia;
BOOLEAN MediaPresent;
BOOLEAN LogicalPartition;
BOOLEAN ReadOnly;
BOOLEAN WriteCaching;
UINT32 BlockSize;
UINT32 IoAlign;
EFI_LBA LastBlock;
EFI_LBA LowestAlignedLba; //added in Revision 2
UINT32 LogicalBlocksPerPhysicalBlock; //added in Revision 2
UINT32 OptimalTransferLengthGranularity; // added in Revision 3
} EFI_BLOCK_IO_MEDIA;

Thanks,
Jabir

Re: More info on revision2 and revision3 of EFI_BLOCK_IO_PROTOCOL

[Wu, Hao A]

Hi Jabir,

> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of
> jabir
> Sent: Friday, January 11, 2019 4:17 PM
> To: edk2-devel@lists.01.org
> Subject: [edk2] More info on revision2 and revision3 of
> EFI_BLOCK_IO_PROTOCOL
> 
> Hi All,
> 
> EFI_BLOCK_IO_MEDIA has two new fields, LowestAlignedLba and
> LogicalBlocksPerPhysicalBlock, added in the revision2 and a field
> OptimalTransferLengthGranularity added in revision3 of
> EFI_BLOCK_IO_PROTOCOL.
> Couldn’t find more info from https://github.com/tianocore/edk2.
> 
> Please help to understand how these fields are consumed by the system
> firmware?

Maybe you can check the latest UEFI Specification Version 2.7 (Errata A):
http://www.uefi.org/sites/default/files/resources/UEFI%20Spec%202_7_A%20Sept%206.pdf

Section 5.3.1, to see if you can get the information.

Best Regards,
Hao Wu

> 
> typedef struct {
> UINT32 MediaId;
> BOOLEAN RemovableMedia;
> BOOLEAN MediaPresent;
> BOOLEAN LogicalPartition;
> BOOLEAN ReadOnly;
> BOOLEAN WriteCaching;
> UINT32 BlockSize;
> UINT32 IoAlign;
> EFI_LBA LastBlock;
> EFI_LBA LowestAlignedLba; //added in Revision 2
> UINT32 LogicalBlocksPerPhysicalBlock; //added in Revision 2
> UINT32 OptimalTransferLengthGranularity; // added in Revision 3
> } EFI_BLOCK_IO_MEDIA;
> 
> Thanks,
> Jabir
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