RPCIF_SMENR_SPIDE
smenr |= RPCIF_SMENR_SPIDE(rpcif_bits_set(rpc, nbytes));
smenr & ~RPCIF_SMENR_SPIDE(0xF));
smenr &= ~RPCIF_SMENR_SPIDE(0xF);
smenr |= RPCIF_SMENR_SPIDE(rpcif_bits_set(rpc, nbytes));
rpc->enable & ~RPCIF_SMENR_SPIDE(0xF));