From: Jason Lowe-Power <jason@lowepower.com>
Date: Mon, 24 Apr 2017 13:55:24 +0000 (-0500)
Subject: dev: Add ATA command used in recent Linux kernels
X-Git-Tag: v19.0.0.0~2839
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a517b4a6fba2674cb2a5b5b50a187473aedd4362;p=gem5.git

dev: Add ATA command used in recent Linux kernels

Add a case for the ATA command ATAPI_IDENTIFY_DEVICE.
This avoids the panic: Unsupported ATA command when booting a recent Linux
kernel. This was tested on 4.8.13.

Change-Id: Ib297a2c02da0730d8698c59801254dd0f5ee9f7f
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-on: https://gem5-review.googlesource.com/2863
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
---

diff --git a/src/dev/storage/ide_disk.cc b/src/dev/storage/ide_disk.cc
index e4b4e625a..de0986e45 100644
--- a/src/dev/storage/ide_disk.cc
+++ b/src/dev/storage/ide_disk.cc
@@ -657,6 +657,7 @@ IdeDisk::startCommand()
 
         // Supported PIO data-in commands
       case WDCC_IDENTIFY:
+      case ATAPI_IDENTIFY_DEVICE:
         cmdBytes = cmdBytesLeft = sizeof(struct ataparams);
         devState = Prepare_Data_In;
         action = ACT_DATA_READY;
@@ -852,7 +853,8 @@ IdeDisk::updateState(DevAction_t action)
             status |= STATUS_DRQ_BIT;
 
             // copy the data into the data buffer
-            if (cmdReg.command == WDCC_IDENTIFY) {
+            if (cmdReg.command == WDCC_IDENTIFY ||
+                cmdReg.command == ATAPI_IDENTIFY_DEVICE) {
                 // Reset the drqBytes for this block
                 drqBytesLeft = sizeof(struct ataparams);