REG_RECVPTR
ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
ether3_outb(write_low, REG_RECVPTR);
ether3_outb(write_high, REG_RECVPTR + 4);
read_low = ether3_inb(REG_RECVPTR);
read_high = ether3_inb(REG_RECVPTR + 4);
ether3_outw(val, REG_RECVPTR);
read_val = ether3_inw(REG_RECVPTR);
ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
ether3_outw(next_ptr, REG_RECVPTR);