[tfaber] 69613: [HAL] - Don't probe for EISA DMA capability on non-EISA machines (i.e. currently never). Patch by Andrey Kudravets. CORE-9895 #resolve

Author: tfaber
Date: Mon Oct 19 08:00:47 2015
New Revision: 69613

URL: http://svn.reactos.org/svn/reactos?rev=69613&view=rev
Log:
[HAL]
- Don't probe for EISA DMA capability on non-EISA machines (i.e. currently never).
Patch by Andrey Kudravets.
CORE-9895 #resolve

Modified:
    trunk/reactos/hal/halx86/generic/dma.c

Modified: trunk/reactos/hal/halx86/generic/dma.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/hal/halx86/generic/dma.c?r…
==============================================================================
--- trunk/reactos/hal/halx86/generic/dma.c	[iso-8859-1] (original)
+++ trunk/reactos/hal/halx86/generic/dma.c	[iso-8859-1] Mon Oct 19 08:00:47 2015
@@ -146,15 +146,18 @@
     HalpDmaOperations.FreeMapRegisters = (PFREE_MAP_REGISTERS)IoFreeMapRegisters;
     HalpDmaOperations.MapTransfer = (PMAP_TRANSFER)IoMapTransfer;
 
-    /*
-     * Check if Extended DMA is available. We're just going to do a random
-     * read and write.
-     */
-    WRITE_PORT_UCHAR((PUCHAR)FIELD_OFFSET(EISA_CONTROL, DmaController2Pages.Channel2),
0x2A);
-    if (READ_PORT_UCHAR((PUCHAR)FIELD_OFFSET(EISA_CONTROL, DmaController2Pages.Channel2))
== 0x2A)
-    {
-        DPRINT1("Machine supports EISA DMA. Bus type: %lu\n", HalpBusType);
-        HalpEisaDma = TRUE;
+    if (HalpBusType == MACHINE_TYPE_EISA)
+    {
+        /*
+        * Check if Extended DMA is available. We're just going to do a random
+        * read and write.
+        */
+        WRITE_PORT_UCHAR((PUCHAR)FIELD_OFFSET(EISA_CONTROL,
DmaController2Pages.Channel2), 0x2A);
+        if (READ_PORT_UCHAR((PUCHAR)FIELD_OFFSET(EISA_CONTROL,
DmaController2Pages.Channel2)) == 0x2A)
+        {
+            DPRINT1("Machine supports EISA DMA. Bus type: %lu\n",
HalpBusType);
+            HalpEisaDma = TRUE;
+        }
     }
 
     /*