update the network support to etherboot-4.5.8.

netboot/nic.h

@@ -1,10 +1,13 @@
-/*
+ /*
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2, or (at
  * your option) any later version.
  */
 
+#ifndef	NIC_H
+#define NIC_H
+
 /*
  *	Structure returned from eth_probe and passed to other driver
  *	functions.
@@ -14,12 +17,14 @@ struct nic
 {
 	void		(*reset)P((struct nic *));
 	int		(*poll)P((struct nic *));
-	void		(*transmit)P((struct nic *, char *d,
-				unsigned int t, unsigned int s, char *p));
+	void		(*transmit)P((struct nic *, const char *d,
+				unsigned int t, unsigned int s, const char *p));
 	void		(*disable)P((struct nic *));
 	char		aui;
-	char		*node_addr;
+	unsigned char	*node_addr;
 	char		*packet;
-	int		packetlen;
+	unsigned int	packetlen;
 	void		*priv_data;	/* driver can hang private data here */
 };
+
+#endif	/* NIC_H */