PROM_MEMORY_DISABLED
*dp &= ~PROM_MEMORY_DISABLED;
*dp |= PROM_MEMORY_DISABLED;
*dp &= ~PROM_MEMORY_DISABLED;
(dp->bank_A[board] & PROM_MEMORY_DISABLED) !=
(dp->bank_B[board] & PROM_MEMORY_DISABLED)) {
PROP_MEMORY_LIST, PROM_MEMORY_DISABLED);
PROP_MEMORY_LIST, PROM_MEMORY_DISABLED);