Changeset 105452 in vbox for trunk

Timestamp:

Jul 23, 2024 3:54:23 PM (6 months ago)

Author:

vboxsync

Message:

DevATA: Do not force bits 7 and 5 in the drive/head register (0x1F6) to one. Some guests expect these bits to be writable, and they are on real drives (see bugref:5869).

File:

• trunk/src/VBox/Devices/Storage/DevATA.cpp (modified) (1 diff)

trunk/src/VBox/Devices/Storage/DevATA.cpp

@@ -4730 +4730 @@
             break;
         case 6: /* drive/head */
-            pCtl->aIfs[0].uATARegSelect = (val & ~0x10) | 0xa0;
-            pCtl->aIfs[1].uATARegSelect = (val | 0x10) | 0xa0;
+            pCtl->aIfs[0].uATARegSelect = val & ~0x10;
+            pCtl->aIfs[1].uATARegSelect = val | 0x10;
             if (((val >> 4) & ATA_SELECTED_IF_MASK) != pCtl->iSelectedIf)
             {