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Re: [Qemu-devel] [BUG] [Seabios] PCI 64bit BARs on Win2008 - unable to s

From: Alexey Korolev
Subject: Re: [Qemu-devel] [BUG] [Seabios] PCI 64bit BARs on Win2008 - unable to start the device. (ACPI lacks the _DSM method)
Date: Mon, 5 Dec 2011 17:29:13 +1300
User-agent: Mozilla/5.0 (X11; Linux i686; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1

Hi Gerd,

We have very early prototype of data acquisition device, with quite large MMIO buffer. It is an emulated device.
We are running the 0.15 release.
0.15 doesn't work correctly with 64bit BARs so I've already added some hacks to Seabios to let OS to choose the memory region.
Thus you see bar 1, addr 0 in seabios log.
Sorry that I haven't specified all this initially. I just want to make 64bit PCI bar working properly. Linux guests works correctly (except early versions - not investigated this yet). At the moment I have some issues with windows which relies on ACPI _CRS.



PCI: map device bus 0, bfd 0x28
   bar 0, addr febe0000, size 10000 [mem]
   bar 1, addr 0, size 20000000 [mem]
Somehow seabios didn't recognise the bar correctly it seems (both 512
and 256 MB cases look the same).  For the 256 MB case seabios should
have mapped the bar @ 0xe0000000.
... and it should also have figured it is prefetchable memory.  Was pci
config space messed up somehow?  What does 'lspci -v' say once you've
booted the machine with linux?

What qemu version you are running?
What kind of device is this?
Emulated?  Code somewhere?
Or a real device passed through to the guest?


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