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37361821dd
There is a check in map_bus_region to make sure we don't pointlessly remap the bus region if the previous mapping was for the same bus. This is tracked with `m_mapped_bus`. However, nothing was actually updating `m_mapped_bus`, and it is initialised to 0. This means that if we start with a device on bus 0, the read in data will be valid. If we map say bus 1 then bus 0 again, the map for bus 0 will now be ignored and invalid data will be read in. Fixed by updating `m_mapped_bus` with the currently mapped bus.