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[Xen-devel] [PATCH] hvmloader: enable bus mastering of PCI device

from [Kouya Shimura]

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Subject:	[Xen-devel] [PATCH] hvmloader: enable bus mastering of PCI device
From:	Kouya Shimura <kouya@xxxxxxxxxxxxxx>
Date:	Thu, 11 Dec 2008 21:38:55 +0900
Delivery-date:	Thu, 11 Dec 2008 04:39:24 -0800
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Without this, init routine in some PCI option ROM doesn't work well.

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>

diff -r 6401c9533ef5 tools/firmware/hvmloader/hvmloader.c
--- a/tools/firmware/hvmloader/hvmloader.c      Wed Dec 10 14:05:41 2008 +0000
+++ b/tools/firmware/hvmloader/hvmloader.c      Thu Dec 11 21:28:49 2008 +0900
@@ -269,6 +269,11 @@ static void pci_setup(void)
             printf("pci dev %02x:%x INT%c->IRQ%u\n",
                    devfn>>3, devfn&7, 'A'+pin-1, isa_irq);
         }
+
+        /* Enable bus mastering. */
+        cmd = pci_readw(devfn, PCI_COMMAND);
+        cmd |= PCI_COMMAND_MASTER;
+        pci_writew(devfn, PCI_COMMAND, cmd);
     }
 
     /* Assign iomem and ioport resources in descending order of size. */

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