On Wed, Nov 30, 2011 at 02:04:08PM +1300, Alexey Korolev wrote: > Hi, > > We have got some issues with 64bit PCI devices support under Windows guests. > Windows fails to start any PCI devices with 64bit BARs when size > exceeds 512MB with error code 12 (can't allocate resources). In > other words it fails when the PCI memory region is located above > 4GB. > > I tried to investigate this problem and found document from Microsoft: > http://msdn.microsoft.com/en-us/windows/hardware/gg462986 > > It states that the _DSM method must be implemented to support > devices above 4GB.
That's not how I read it: Windows Vista always respects the boot configuration of devices above 4 GB, considering the processor’s addressing capability and the version of the Windows operating system that is running. > Unfortunately I'm not familiar with ACPI code of seabios, so can't > implement the _DSM method. May be you have other ideas what needs to > be done to fix it? Any help is appreciated. > > Thanks, > Alexey Could you share some more detail about your setup? -- MST