Cache image method based on PCIE non-transparent bridge

The invention discloses a cache image method based on a PCIE non-transparent bridge. The method is characterized in that the PCIE non-transparent bridge is adopted between two controllers A and B to achieve memory address mapping and achieve cache data transmission, and cache image backup is arranged between the two controllers. By using the memory address mapping function of the PICE non-transparent bridge, memory reading and writing between control domains of the two controllers and processors, and the mutual image backup function of the cache between the two controllers is achieved.