AGP_NVIDIA_0_APSIZE
temp = pci_read_config(sc->dev, AGP_NVIDIA_0_APSIZE, 4);
pci_write_config(sc->dev, AGP_NVIDIA_0_APSIZE, temp | 0x100, 4);
temp = pci_read_config(sc->dev, AGP_NVIDIA_0_APSIZE, 4);
pci_write_config(sc->dev, AGP_NVIDIA_0_APSIZE, temp & ~(0x100), 4);
switch (pci_read_config(dev, AGP_NVIDIA_0_APSIZE, 1) & 0x0f) {
pci_read_config(dev, AGP_NVIDIA_0_APSIZE, 1));
val = pci_read_config(dev, AGP_NVIDIA_0_APSIZE, 1);
pci_write_config(dev, AGP_NVIDIA_0_APSIZE, ((val & ~0x0f) | key), 1);