E1000_RCTL_SBP
reg_rctl |= E1000_RCTL_SBP;
reg_rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_SBP);
rctl |= E1000_RCTL_SBP;
rctl &= ~E1000_RCTL_SBP;
reg_rctl |= E1000_RCTL_SBP;
reg_rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_SBP);
rctl &= ~E1000_RCTL_SBP;
rctl &= ~E1000_RCTL_SBP;
rctl |= E1000_RCTL_SBP;
temp_rctl = rctl & ~(E1000_RCTL_EN | E1000_RCTL_SBP);
rctl &= ~E1000_RCTL_SBP;