1 /* 2 * (C) Copyright 2000-2002 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 #include <common.h> 25 #include <command.h> 26 #include <net.h> 27 #include "nfs.h" 28 #include "bootp.h" 29 #include "rarp.h" 30 #include "tftp.h" 31 32 #if defined(CONFIG_CMD_NET) 33 34 #define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */ 35 #ifndef CONFIG_NET_RETRY_COUNT 36 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 37 #else 38 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT) 39 #endif 40 41 42 int RarpTry; 43 44 /* 45 * Handle a RARP received packet. 46 */ 47 static void 48 RarpHandler(uchar * dummi0, unsigned dummi1, unsigned dummi2, unsigned dummi3) 49 { 50 char *s; 51 debug("Got good RARP\n"); 52 if ((s = getenv("autoload")) != NULL) { 53 if (*s == 'n') { 54 /* 55 * Just use RARP to configure system; 56 * Do not use TFTP/NFS to to load the bootfile. 57 */ 58 NetState = NETLOOP_SUCCESS; 59 return; 60 #if defined(CONFIG_CMD_NFS) 61 } else if ((s != NULL) && !strcmp(s, "NFS")) { 62 NfsStart(); 63 return; 64 #endif 65 } 66 } 67 TftpStart (); 68 } 69 70 71 /* 72 * Timeout on BOOTP request. 73 */ 74 static void 75 RarpTimeout(void) 76 { 77 if (RarpTry >= TIMEOUT_COUNT) { 78 puts ("\nRetry count exceeded; starting again\n"); 79 NetStartAgain (); 80 } else { 81 NetSetTimeout (TIMEOUT, RarpTimeout); 82 RarpRequest (); 83 } 84 } 85 86 87 void 88 RarpRequest (void) 89 { 90 int i; 91 volatile uchar *pkt; 92 ARP_t * rarp; 93 94 printf("RARP broadcast %d\n", ++RarpTry); 95 pkt = NetTxPacket; 96 97 pkt += NetSetEther(pkt, NetBcastAddr, PROT_RARP); 98 99 rarp = (ARP_t *)pkt; 100 101 rarp->ar_hrd = htons (ARP_ETHER); 102 rarp->ar_pro = htons (PROT_IP); 103 rarp->ar_hln = 6; 104 rarp->ar_pln = 4; 105 rarp->ar_op = htons (RARPOP_REQUEST); 106 memcpy (&rarp->ar_data[0], NetOurEther, 6); /* source ET addr */ 107 memcpy (&rarp->ar_data[6], &NetOurIP, 4); /* source IP addr */ 108 memcpy (&rarp->ar_data[10], NetOurEther, 6); /* dest ET addr = source ET addr ??*/ 109 /* dest. IP addr set to broadcast */ 110 for (i = 0; i <= 3; i++) { 111 rarp->ar_data[16 + i] = 0xff; 112 } 113 114 NetSendPacket(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE); 115 116 NetSetTimeout(TIMEOUT, RarpTimeout); 117 NetSetHandler(RarpHandler); 118 } 119 120 #endif 121