/* * BCM570x memory map. The internal memory layout varies somewhat * depending on whether or not we have external SSRAM attached. * The BCM5700 can have up to 16MB of external memory. The BCM5701 * is apparently not designed to use external SSRAM. The mappings * up to the first 4 send rings are the same for both internal and * external memory configurations. Note that mini RX ring space is * only available with external SSRAM configurations, which means * the mini RX ring is not supported on the BCM5701. * * The NIC's memory can be accessed by the host in one of 3 ways: * * 1) Indirect register access. The MEMWIN_BASEADDR and MEMWIN_DATA * registers in PCI config space can be used to read any 32-bit * address within the NIC's memory. * * 2) Memory window access. The MEMWIN_BASEADDR register in PCI config * space can be used in conjunction with the memory window in the * device register space at offset 0x8000 to read any 32K chunk * of NIC memory. * * 3) Flat mode. If the 'flat mode' bit in the PCI state register is * set, the device I/O mapping consumes 32MB of host address space, * allowing all of the registers and internal NIC memory to be * accessed directly. NIC memory addresses are offset by 0x01000000. * Flat mode consumes so much host address space that it is not * recommended. */