[Xen-users] Xen 3.2.1, Intel DQ35JO tips

["Jefferson E. Noxon" <jeff@xxxxxxxxxxxxxx>]

I thought I'd pass along a few tips for getting the Intel DQ35JO 
motherboard to play nice with Xen:
1. The dom0 kernel won't boot with CONFIG_PCI_MMCONFIG enabled.

If you get a hang during boot after seeing this message:

        ACPI: PCI Root Bridge [PCI0] (0000:00)

...then MMCONFIG is your problem.

Some kernels seem to support a pci=nommconfig option, but my Gentoo 
2.6.21 Xen kernel didn't.  The solution was to build the kernel without 
MMCONFIG.  A temporary workaround is to boot with acpi=off, but you 
won't get SMP support if you turn off ACPI.
(Confirmed with BIOS 0882 and 0559)

2. The on-board 82566DM-2 Ethernet chip is supported by the e1000e 
driver, not the old e1000 driver.  You can get it from Sourceforge. 
(I'm running kernel 2.6.21)
3. VT-d is not available unless you enable it on the Xen command line 
(not just in the BIOS).  Xen prints a non-intuitive error message 
suggesting that VT-d is not available, when in fact it's just not turned on.
4. The AMT/vPro management function seems to work just fine with Xen & Linux

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