O2_RES_WRITE_BURST
a | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
b | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
a & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));
b & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));