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The ATA alignment_logic_in_phy_blocks field doesn’t directly report the lowest aligned LBA. Instead, there’s some modulo arithmetic involved. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10265 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
erictian 2010-03-17 09:46:53 +00:00
parent 9f50cb977c
commit fa03149c12
1 changed files with 2 additions and 1 deletions
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3
MdeModulePkg/Bus/Ata/AtaBusDxe/AtaPassThruExecute.c
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@ -304,7 +304,8 @@ IdentifyAtaDevice (
// Check lowest alignment of logical blocks within physical block
//
if ((IdentifyData->alignment_logic_in_phy_blocks & (BIT14 | BIT15)) == BIT14) {
BlockMedia->LowestAlignedLba = (EFI_LBA) (IdentifyData->alignment_logic_in_phy_blocks & 0x3fff);
BlockMedia->LowestAlignedLba = (EFI_LBA) (BlockMedia->LogicalBlocksPerPhysicalBlock - (IdentifyData->alignment_logic_in_phy_blocks & 0x3fff)) %
BlockMedia->LogicalBlocksPerPhysicalBlock;
}
}
//