*** if_lnc.c.orig	Mon Aug  9 16:23:27 1999
--- if_lnc.c	Tue Aug 10 12:10:07 1999
***************
*** 1504,1516 ****
  
  	write_csr(sc, CSR3, 0);
  
  	/* Let's see if it starts */
  
  	write_csr(sc, CSR0, INIT);
  	for (i = 0; i < 1000; i++)
  		if (read_csr(sc, CSR0) & IDON)
  			break;
- 
  	/*
  	 * Now that the initialisation is complete there's no reason to
  	 * access anything except CSR0, so we leave RAP pointing there
--- 1504,1528 ----
  
  	write_csr(sc, CSR3, 0);
  
+ 	/* 
+ 	 * If we have a Am79C97x series card, we set the NOUFLO bit
+ 	 * (bit 11) in BCR18 to avoid underflow errors.
+ 	 * The #define's really should go to ic/Am79C972.h
+ 	 */
+ #define BCR18 18
+ #define NOUFLO 0x0800
+ 	if (sc->nic.ic > PCnet_FAST) {
+ 	  u_short oval;
+ 	  oval = read_bcr (sc, BCR18);
+ 	  write_bcr (sc, BCR18, oval|NOUFLO);
+ 	}
+ 
  	/* Let's see if it starts */
  
  	write_csr(sc, CSR0, INIT);
  	for (i = 0; i < 1000; i++)
  		if (read_csr(sc, CSR0) & IDON)
  			break;
  	/*
  	 * Now that the initialisation is complete there's no reason to
  	 * access anything except CSR0, so we leave RAP pointing there