- make irongate_ioremap() use generic __alpha_remap_area_pages();
- remove huge debugging printk;
- AGP remapping hardware disabled for now. Any attempt to use it
  would result in corrupted memory;
- albacore (UP1500) support:
  - handle differences between AMD-761 (UP1500) and AMD-751 (UP1000/1100)
    chipsets, namely ECC mode/status and pci_mem registers;
  - customized nautilus_init_pci() to minimize amount of system memory
    consumed by PCI MMIO for 4Gb configuration.

Ivan.