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 5UL /* Seconds 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 #ifdef DEBUG 52 puts ("Got good RARP\n"); 53 #endif 54 if ((s = getenv("autoload")) != NULL) { 55 if (*s == 'n') { 56 /* 57 * Just use RARP to configure system; 58 * Do not use TFTP/NFS to to load the bootfile. 59 */ 60 NetState = NETLOOP_SUCCESS; 61 return; 62 #if defined(CONFIG_CMD_NFS) 63 } else if ((s != NULL) && !strcmp(s, "NFS")) { 64 NfsStart(); 65 return; 66 #endif 67 } 68 } 69 TftpStart (); 70 } 71 72 73 /* 74 * Timeout on BOOTP request. 75 */ 76 static void 77 RarpTimeout(void) 78 { 79 if (RarpTry >= TIMEOUT_COUNT) { 80 puts ("\nRetry count exceeded; starting again\n"); 81 NetStartAgain (); 82 } else { 83 NetSetTimeout (TIMEOUT * CFG_HZ, RarpTimeout); 84 RarpRequest (); 85 } 86 } 87 88 89 void 90 RarpRequest (void) 91 { 92 int i; 93 volatile uchar *pkt; 94 ARP_t * rarp; 95 96 printf("RARP broadcast %d\n", ++RarpTry); 97 pkt = NetTxPacket; 98 99 pkt += NetSetEther(pkt, NetBcastAddr, PROT_RARP); 100 101 rarp = (ARP_t *)pkt; 102 103 rarp->ar_hrd = htons (ARP_ETHER); 104 rarp->ar_pro = htons (PROT_IP); 105 rarp->ar_hln = 6; 106 rarp->ar_pln = 4; 107 rarp->ar_op = htons (RARPOP_REQUEST); 108 memcpy (&rarp->ar_data[0], NetOurEther, 6); /* source ET addr */ 109 memcpy (&rarp->ar_data[6], &NetOurIP, 4); /* source IP addr */ 110 memcpy (&rarp->ar_data[10], NetOurEther, 6); /* dest ET addr = source ET addr ??*/ 111 /* dest. IP addr set to broadcast */ 112 for (i = 0; i <= 3; i++) { 113 rarp->ar_data[16 + i] = 0xff; 114 } 115 116 NetSendPacket(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE); 117 118 NetSetTimeout(TIMEOUT * CFG_HZ, RarpTimeout); 119 NetSetHandler(RarpHandler); 120 } 121 122 #endif 123