VMD_MEMBAR2
vmd->dev->resource[VMD_MEMBAR2].child = &vmd->resources[2];
vmd->dev->resource[VMD_MEMBAR2].child = NULL;
membar2 = pci_iomap(dev, VMD_MEMBAR2, 0);
*offset2 = dev->resource[VMD_MEMBAR2].start -
res = &vmd->dev->resource[VMD_MEMBAR2];