AGP_INTEL_I845_AGPM
pci_write_config(dev, AGP_INTEL_I845_AGPM,
(pci_read_config(dev, AGP_INTEL_I845_AGPM, 1)
reg = pci_read_config(dev, AGP_INTEL_I845_AGPM, 1) & ~(1 << 1);
pci_write_config(dev, AGP_INTEL_I845_AGPM, reg, 1);