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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@10266 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
erictian 2010-03-17 09:48:05 +00:00
parent fa03149c12
commit c0d69d10f6
1 changed files with 2 additions and 1 deletions
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3
IntelFrameworkModulePkg/Bus/Pci/IdeBusDxe/Ata.c
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@ -2563,7 +2563,8 @@ AtaEnableLongPhysicalSector (
//
if ((AtaIdentifyData->alignment_logic_in_phy_blocks & 0xc000) == 0x4000) {
IdeDev->BlkIo.Media->LowestAlignedLba =
(EFI_LBA) (AtaIdentifyData->alignment_logic_in_phy_blocks & 0x3fff);
(EFI_LBA) (IdeDev->BlkIo.Media->LogicalBlocksPerPhysicalBlock - (AtaIdentifyData->alignment_logic_in_phy_blocks & 0x3fff)) %
IdeDev->BlkIo.Media->LogicalBlocksPerPhysicalBlock;
}
}
//