BSM_WR_DWCOUNT_REG
val = il_rd_prph(il, BSM_WR_DWCOUNT_REG);
il_wr_prph(il, BSM_WR_DWCOUNT_REG, len / sizeof(u32));
val = il_rd_prph(il, BSM_WR_DWCOUNT_REG);
il_wr_prph(il, BSM_WR_DWCOUNT_REG, len / sizeof(u32));