Merge pull request CosmosOS#1057 from sjmulder/pr/floating-bus

Check for floating bus
nealhoang · Oct 12, 2018 · 89e26bd · 89e26bd
2 parents a09a2ef + 87a233a
commit 89e26bd
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/source/Cosmos.HAL2/BlockDevice/AtaPio.cs b/source/Cosmos.HAL2/BlockDevice/AtaPio.cs
@@ -163,6 +163,14 @@ public AtaPio(Core.IOGroup.ATA aIO, Ata.ControllerIdEnum aControllerId, Ata.BusP
 		public SpecLevel DiscoverDrive()
 		{
 			SelectDrive(0);
+
+			// Read status before sending command. If 0xFF, it's a floating
+			// bus (nothing connected)
+			if (IO.Status.Byte == 0xFF)
+			{
+				return SpecLevel.Null;
+			}
+
 			var xIdentifyStatus = SendCmd(Cmd.Identify, false);
 			// No drive found, go to next
 			if (xIdentifyStatus == Status.None)