RT2560_TX_VALID
!(LE_32(desc->flags) & RT2560_TX_VALID))
desc->flags &= ~LE_32(RT2560_TX_VALID);
!(LE_32(desc->flags) & RT2560_TX_VALID))
desc->flags &= ~LE_32(RT2560_TX_VALID);
LE_32(RT2560_TX_BUSY | RT2560_TX_VALID);