LCA_PCI_SPARSE
alpha_pci_chipset->pc_mem = LCA_PCI_SPARSE;
#define CHIP_S_MEM_W1_SYS_START(v) LCA_PCI_SPARSE
(LCA_PCI_SPARSE + (0x01000000UL << 5) - 1)
(LCA_PCI_SPARSE + (0x01000000UL << 5))
(LCA_PCI_SPARSE + (0x08000000UL << 5) - 1)