RBR_CFIG_B_BUFSZ0_SHIFT
val |= (RBR_BUFSZ0_256 << RBR_CFIG_B_BUFSZ0_SHIFT);
val |= (RBR_BUFSZ0_512 << RBR_CFIG_B_BUFSZ0_SHIFT);
val |= (RBR_BUFSZ0_1K << RBR_CFIG_B_BUFSZ0_SHIFT);
val |= (RBR_BUFSZ0_2K << RBR_CFIG_B_BUFSZ0_SHIFT);