forked from Imagelibrary/rtems
* start/start.S, startup/bspstart.c: disable memory-select errors early (in start.S) to avoid hangs due to speculative memory access (motload maps absent memory in TLBs). Remove TLB mappings for which no physical memory is installed (bspstart). Enable HID1[RFXE] so that 'core_fault_in' errors result in a machine-check rather than stalling the machine. Re-enable memory-select errors at this point.