pci_alloc_msi error

[lixin.pang at emc.com]

I'm writing a PCI device driver for freebsd 7.3.  In the driver attach function,

pci_enable_busmaster(dev) returns 0,

pci_msi_count(dev) returns 1,

however, error = pci_alloc_msi(dev, &msi) failed with error == 6 (device not configured).

Am I missing any steps before calling pci_alloc_msi?

Thanks

Lixin