RAMBO_BLKCNT
count = bus_space_read_2(esc->sc_bst, esc->dm_bsh, RAMBO_BLKCNT);
bus_space_write_2(esc->sc_bst, esc->dm_bsh, RAMBO_BLKCNT, 0);
bus_space_write_2(esc->sc_bst, esc->dm_bsh, RAMBO_BLKCNT, blocks);
bus_space_write_2(esc->sc_bst, esc->dm_bsh, RAMBO_BLKCNT, 0);
if (bus_space_read_2(esc->sc_bst, esc->dm_bsh, RAMBO_BLKCNT)) {
bus_space_write_2(esc->sc_bst, esc->dm_bsh, RAMBO_BLKCNT, blocks);