diff -ru grub-0.97.orig/netboot/main.c grub-0.97/netboot/main.c
--- grub-0.97.orig/netboot/main.c	2004-05-21 08:19:33.000000000 +1000
+++ grub-0.97/netboot/main.c	2008-06-30 22:57:04.000000000 +1000
@@ -54,9 +54,9 @@
 
 static int vendorext_isvalid;
 static unsigned long netmask;
-static struct bootpd_t bootp_data;
+struct bootpd_t bootp_data;
 static unsigned long xid;
-static unsigned char *end_of_rfc1533 = NULL;
+unsigned char *end_of_rfc1533 = NULL;
 
 #ifndef	NO_DHCP_SUPPORT
 #endif /* NO_DHCP_SUPPORT */
diff -ru grub-0.97.orig/netboot/natsemi.c grub-0.97/netboot/natsemi.c
--- grub-0.97.orig/netboot/natsemi.c	2003-07-09 21:45:38.000000000 +1000
+++ grub-0.97/netboot/natsemi.c	2008-06-30 23:00:30.000000000 +1000
@@ -608,7 +608,7 @@
 		 const char  *p)     /* Packet */
 {
     u32 status, to, nstype;
-    u32 tx_status;
+    volatile u32 tx_status;
     
     /* Stop the transmitter */
     outl(TxOff, ioaddr + ChipCmd);
@@ -647,7 +647,7 @@
 
     to = currticks() + TX_TIMEOUT;
 
-    while ((((volatile u32) tx_status=txd.cmdsts) & OWN) && (currticks() < to))
+    while (((tx_status=txd.cmdsts) & OWN) && (currticks() < to))
         /* wait */ ;
 
     if (currticks() >= to) {
diff -ru grub-0.97.orig/netboot/sis900.c grub-0.97/netboot/sis900.c
--- grub-0.97.orig/netboot/sis900.c	2003-07-09 21:45:38.000000000 +1000
+++ grub-0.97/netboot/sis900.c	2008-06-30 23:01:55.000000000 +1000
@@ -901,7 +901,7 @@
                 const char  *p)     /* Packet */
 {
     u32 status, to, nstype;
-    u32 tx_status;
+    volatile u32 tx_status;
     
     /* Stop the transmitter */
     outl(TxDIS, ioaddr + cr);
@@ -940,7 +940,7 @@
 
     to = currticks() + TX_TIMEOUT;
 
-    while ((((volatile u32) tx_status=txd.cmdsts) & OWN) && (currticks() < to))
+    while (((tx_status=txd.cmdsts) & OWN) && (currticks() < to))
         /* wait */ ;
 
     if (currticks() >= to) {