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MdeModulePkg/AtaBusDxe: Fix some ATA hard drives cannot be discovered 

If there is no multiplier, the DEV bit of the ATA device register would
always be set. It causes that some ATA hard drives don't response the
ATA identity command sent to them.

Below is the description about DEV bit in ATA spec:
A device is selected when the DEV bit of the Device register is equal to
the device number assigned to the device by means of a Device 0/Device 1
jumper or switch, or use of the CSEL signal.

Below is the description about DEV bit in SATA spec:
When the DEV bit in the Device register is set to one, selecting the
non-existent Device 1, the host adapter shall respond to register reads
and writes as specified for a Device 0 with no Device 1 present, as
defined in the ATA/ATAPI-5 standard.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Cinnamon Shia <cinnamon.shia@hpe.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
This commit is contained in:
Cinnamon Shia 2016-06-06 12:07:58 +08:00 committed by Hao Wu
parent be266b1090
commit 2d273c8db9
1 changed files with 2 additions and 1 deletions
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3
MdeModulePkg/Bus/Ata/AtaBusDxe/AtaPassThruExecute.c
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@ -11,6 +11,7 @@
Cylinder register.
Copyright (c) 2009 - 2013, Intel Corporation. All rights reserved.<BR>
(C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@ -413,7 +414,7 @@ DiscoverAtaDevice (
//
Acb = ZeroMem (&AtaDevice->Acb, sizeof (EFI_ATA_COMMAND_BLOCK));
Acb->AtaCommand = ATA_CMD_IDENTIFY_DRIVE;
Acb->AtaDeviceHead = (UINT8) (BIT7 | BIT6 | BIT5 | (AtaDevice->PortMultiplierPort << 4));
Acb->AtaDeviceHead = (UINT8) (BIT7 | BIT6 | BIT5 | (AtaDevice->PortMultiplierPort == 0xFFFF ? 0 : (AtaDevice->PortMultiplierPort << 4)));
//
// Prepare for ATA pass through packet.