PCI_STATUS_BACKTOBACK_SUPPORT
PCI_STATUS_BACKTOBACK_SUPPORT |
PCI_STATUS_BACKTOBACK_SUPPORT | PCI_STATUS_DEVSEL_MEDIUM;
if (csr & PCI_STATUS_BACKTOBACK_SUPPORT)
PCI_STATUS_BACKTOBACK_SUPPORT);
if ((cmd & PCI_STATUS_BACKTOBACK_SUPPORT) == 0)