IGC_RXPBS
size = rd32(IGC_RXPBS) &
wr32(IGC_RXPBS, IGC_RXPBSIZE_EXP_BMC_DEFAULT);
val = rd32(IGC_RXPBS);
wr32(IGC_RXPBS, val);
val = rd32(IGC_RXPBS);
wr32(IGC_RXPBS, val);
u32 rxpbs = rd32(IGC_RXPBS);
wr32(IGC_RXPBS, rxpbs);