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[/] [openrisc/] [trunk/] [bootloaders/] [orpmon/] [services/] [tftp.c] - Blame information for rev 197

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/*
 *      Copyright 1994, 1995, 2000 Neil Russell.
 *      (See License)
 *      Copyright 2000, 2001 DENX Software Engineering, Wolfgang Denk, wd@denx.de
 */
 
#include "common.h"
#include "support.h"
#include "net.h"
#include "tftp.h"
#include "bootp.h"
 
//#undef        ET_DEBUG
#define ET_DEBUG
 
#define WELL_KNOWN_PORT 69              /* Well known TFTP port #               */
#define TIMEOUT         2               /* Seconds to timeout for a lost pkt    */
#define TIMEOUT_COUNT   10              /* # of timeouts before giving up       */
                                        /* (for checking the image size)        */
#define HASHES_PER_LINE 65              /* Number of "loading" hashes per line  */
 
/*
 *      TFTP operations.
 */
#define TFTP_RRQ        1
#define TFTP_WRQ        2
#define TFTP_DATA       3
#define TFTP_ACK        4
#define TFTP_ERROR      5
 
 
static int      TftpServerPort;         /* The UDP port at their end            */
static int      TftpOurPort;            /* The UDP port at our end              */
static int      TftpTimeoutCount;
static unsigned TftpBlock;
static unsigned TftpLastBlock;
static int      TftpState;
#define STATE_RRQ       1
#define STATE_DATA      2
#define STATE_TOO_LARGE 3
#define STATE_BAD_MAGIC 4
 
char *tftp_filename;
 
 
// running TFTP CRC value
unsigned long TFTP_CHKSUM;
 
#ifdef CFG_DIRECT_FLASH_TFTP
extern flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
#endif
 
static __inline__ void
store_block (unsigned block, unsigned char * src, unsigned len)
{
        unsigned long offset = block * 512, newsize = offset + len;
#ifdef CFG_DIRECT_FLASH_TFTP
        int i, rc = 0;
 
        for (i=0; i<CFG_MAX_FLASH_BANKS; i++) {
                /* start address in flash? */
                if (global.src_addr + offset >= flash_info[i].start[0]) {
                        rc = 1;
                        break;
                }
        }
 
        if (rc) { /* Flash is destination for this packet */
                rc = flash_write ((unsigned char *)src, (unsigned long)(global.src_addr+offset), len);
                switch (rc) {
                case 0:  /* OK */
                        break;
                case 1: printf ("Timeout writing to Flash\n");
                        break;
                case 2: printf ("Flash not Erased\n");
                        break;
                case 4: printf ("Can't write to protected Flash sectors\n");
                        break;
                case 8: printf ("Outside available Flash\n");
                        break;
                case 16:printf ("Size must be aligned (multiple of 8?)\n");
                        break;
                default:
                        printf ("%s[%d] FIXME: rc=%d\n",__FILE__,__LINE__,rc);
                        break;
                }
                if (rc) {
                        NetState = NETLOOP_FAIL;
                        return;
                }
        }
        else
#endif /* CFG_DIRECT_FLASH_TFTP */
 
//#define QUICK_ETHPACKET_COPY    
#ifdef QUICK_ETHPACKET_COPY
          {
            unsigned char * dst = (unsigned char*)(global.src_addr + offset);
            //printf("quick ethpacket copy: src: 0x%x dst: 0x%x, len: %d\n",(unsigned long)src, (unsigned long)dst, len);
            // First, align the destination address so we can copy words
            // If either src or dst are not word aligned, then we will never
            // be able to do word copies
            while((len) && ((((unsigned long)dst) & 0x3) || (((unsigned long)src) & 0x3)))
              {
                //              printf("bc: src: 0x%x dst: 0x%x, len: %d\n",(unsigned long)src, (unsigned long)dst, len);
                dst[0] = src[0];
                len--;
                dst++;
                src++;
 
              }
            unsigned long *wdst, *wsrc;
            wdst = (unsigned long*) dst;
            wsrc = (unsigned long*) src;
            while(len >= 4)
              {
                //printf("wc: src: 0x%x dst: 0x%x, len: %d\n",(unsigned long)src, (unsigned long)dst, len);
                wdst[0] = wsrc[0];
                wdst++; wsrc++;
                len -= 4;
                dst+=4;
                src+=4;
 
              }
            while (len)
              {
                //printf("cu: src: 0x%x dst: 0x%x, len: %d\n",(unsigned long)src, (unsigned long)dst, len);
                dst[0] = src[0];
                len--;
                dst++;
                src++;
              }
          }
#else
 
#ifdef TFTP_CALC_CRC
        // Call special memcpy that calculates CRC for us:
        TFTP_CHKSUM += memcpy_crc((void *)(global.src_addr + offset), src, len);
#else
        // Standard memcpy:
        (void)memcpy((void *)(global.src_addr + offset), src, len);
#endif
 
 
#endif    
 
        if (NetBootFileXferSize < newsize)
                NetBootFileXferSize = newsize;
}
 
static void TftpSend (void);
static void TftpTimeout (void);
 
/**********************************************************************/
 
static void
TftpSend (void)
{
        volatile unsigned char *        pkt;
        volatile unsigned char *        xp;
        int                     len = 0;
 
#ifdef ET_DEBUG
        //printf("TftpSend: %d\n", TftpState);
#endif
 
 
        /*
         *      We will always be sending some sort of packet, so
         *      cobble together the packet headers now.
         */
        pkt = NetTxPacket + ETHER_HDR_SIZE + IP_HDR_SIZE;
 
        switch (TftpState) {
 
        case STATE_RRQ:
                xp = pkt;
                (*((unsigned short *)pkt)) = SWAP16c(TFTP_RRQ);
                pkt += sizeof(short);
                strcpy ((char *)pkt, tftp_filename);
                pkt += strlen(tftp_filename) + 1;
                strcpy ((char *)pkt, "octet");
                pkt += 5 /*strlen("octet")*/ + 1;
                len = pkt - xp;
 
                break;
 
        case STATE_DATA:
                xp = pkt;
                *((unsigned short *)pkt) = SWAP16c(TFTP_ACK);
                pkt += sizeof(short);
                *((unsigned short *)pkt) = SWAP16(TftpBlock);
                pkt += sizeof(short);
                len = pkt - xp;
                break;
 
        case STATE_TOO_LARGE:
                xp = pkt;
                *((unsigned short *)pkt) = SWAP16c(TFTP_ERROR);
                pkt += sizeof(short);
                *((unsigned short *)pkt) = SWAP16(3);
                pkt += sizeof(short);
                strcpy ((char *)pkt, "File too large");
                pkt += 14 /*strlen("File too large")*/ + 1;
                len = pkt - xp;
                break;
 
        case STATE_BAD_MAGIC:
                xp = pkt;
                *((unsigned short *)pkt) = SWAP16c(TFTP_ERROR);
                pkt += sizeof(short);
                *((unsigned short *)pkt) = SWAP16(2);
                pkt += sizeof(short);
                strcpy ((char *)pkt, "File has bad magic");
                pkt += 18 /*strlen("File has bad magic")*/ + 1;
                len = pkt - xp;
                break;
        }
 
        NetSetEther (NetTxPacket, NetServerEther, PROT_IP);
        NetSetIP (NetTxPacket + ETHER_HDR_SIZE, NetServerIP,
                                        TftpServerPort, TftpOurPort, len);
        NetSendPacket (NetTxPacket, ETHER_HDR_SIZE + IP_HDR_SIZE + len);
 
}
 
 
static void
TftpHandler (unsigned char * pkt, unsigned dest, unsigned src, unsigned len)
{
#ifdef ET_DEBUG
  //  printf("TftpHandler\n");
#endif
        if (dest != TftpOurPort) {
                return;
        }
        if (TftpState != STATE_RRQ && src != TftpServerPort) {
                return;
        }
 
        if (len < 2) {
                return;
        }
        len -= 2;
        switch (SWAP16(*((unsigned short *)pkt))) {
 
        case TFTP_RRQ:
        case TFTP_WRQ:
        case TFTP_ACK:
             pkt += sizeof(short);
                break;
        default:
                break;
 
        case TFTP_DATA:
                pkt += sizeof(short);
                if (len < 2)
                        return;
                len -= 2;
                TftpBlock = SWAP16(*(unsigned short *)pkt);
                if (((TftpBlock - 1) % 10) == 0) {
                        putc ('#');
                        TftpTimeoutCount = 0;
                } else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0) {
                        printf ("\n\t ");
                }
 
                if (TftpState == STATE_RRQ) {
                        TftpState = STATE_DATA;
                        TftpServerPort = src;
                        TftpLastBlock = 0;
 
                        if (TftpBlock != 1) {   /* Assertion */
                                printf ("\nTFTP error: "
                                        "First block is not block 1 (%d)\n"
                                        "Starting again\n\n",
                                        TftpBlock);
                                NetStartAgain ();
                                break;
                        }
                }
 
                if (TftpBlock == TftpLastBlock) {
                        /*
                         *      Same block again; ignore it.
                         */
                        break;
                }
 
                TftpLastBlock = TftpBlock;
                NetSetTimeout (TIMEOUT * TICKS_PER_SEC, TftpTimeout);
 
                store_block (TftpBlock - 1, pkt + 2, len);
 
                /*
                 *      Acknoledge the block just received, which will prompt
                 *      the server for the next one.
                 */
                TftpSend ();
 
                if (len < 512) {
                        /*
                         *      We received the whole thing.  Try to
                         *      run it.
                         */
                        printf ("\ndone\n");
                        NetState = NETLOOP_SUCCESS;
                }
                break;
 
        case TFTP_ERROR:
                pkt += sizeof(short);
                printf ("\nTFTP error: '%s' (%d)\n",
                        pkt + 2, SWAP16(*(unsigned short *)pkt));
                printf ("Starting again\n\n");
                NetStartAgain ();
                break;
        }
 
}
 
 
static void
TftpTimeout (void)
{
        if (++TftpTimeoutCount >= TIMEOUT_COUNT) {
                printf ("\nRetry count exceeded; starting again\n");
                NetStartAgain ();
        } else {
                printf ("T ");
                NetSetTimeout (TIMEOUT * TICKS_PER_SEC, TftpTimeout);
                TftpSend ();
        }
}
 
 
void
TftpStart (void)
{
#ifdef ET_DEBUG
        printf ("\nServer ethernet address %02x:%02x:%02x:%02x:%02x:%02x\n",
                NetServerEther[0],
                NetServerEther[1],
                NetServerEther[2],
                NetServerEther[3],
                NetServerEther[4],
                NetServerEther[5]
        );
#endif /* DEBUG */
 
        TFTP_CHKSUM = 0; // Reset checksum
 
        printf ("TFTP from server ");   print_IPaddr (NetServerIP);
        printf ("; our IP address is ");        print_IPaddr (NetOurIP);
 
        // Check if we need to send across this subnet
        if (NetOurGatewayIP && NetOurSubnetMask) {
            IPaddr_t OurNet     = NetOurIP    & NetOurSubnetMask;
            IPaddr_t ServerNet  = NetServerIP & NetOurSubnetMask;
 
            if (OurNet != ServerNet) {
                printf ("; sending through gateway ");
                print_IPaddr (NetOurGatewayIP) ;
            }
        }
        putc ('\n');
 
        printf ("Filename '%s'.", tftp_filename);
 
        if (NetBootFileSize) {
            printf (" Size is %d%s kB => %x Bytes",
                NetBootFileSize/2,
                (NetBootFileSize%2) ? ".5" : "",
                NetBootFileSize<<9);
        }
 
        putc ('\n');
 
        printf ("Load address: 0x%lx\n", global.src_addr);
 
        printf ("Loading: *\b");
 
        NetSetTimeout (TIMEOUT * TICKS_PER_SEC, TftpTimeout);
        NetSetHandler (TftpHandler);
 
        TftpServerPort = WELL_KNOWN_PORT;
        TftpTimeoutCount = 0;
        TftpState = STATE_RRQ;
        TftpOurPort = 1024 + (get_timer(0) % 3072);
 
        TftpSend ();
}
 

Line No.	Rev	Author	Line
1	2	marcus.erl	`/*`
2			`* Copyright 1994, 1995, 2000 Neil Russell.`
3			`* (See License)`
4			`* Copyright 2000, 2001 DENX Software Engineering, Wolfgang Denk, wd@denx.de`
5			`*/`
6
7			`#include "common.h"`
8			`#include "support.h"`
9			`#include "net.h"`
10			`#include "tftp.h"`
11			`#include "bootp.h"`
12
13	140	julius	`//#undef ET_DEBUG`
14			`#define ET_DEBUG`
15	2	marcus.erl
16			`#define WELL_KNOWN_PORT 69 /* Well known TFTP port # */`
17			`#define TIMEOUT 2 /* Seconds to timeout for a lost pkt */`
18			`#define TIMEOUT_COUNT 10 /* # of timeouts before giving up */`
19			`/* (for checking the image size) */`
20			`#define HASHES_PER_LINE 65 /* Number of "loading" hashes per line */`
21
22			`/*`
23			`* TFTP operations.`
24			`*/`
25			`#define TFTP_RRQ 1`
26			`#define TFTP_WRQ 2`
27			`#define TFTP_DATA 3`
28			`#define TFTP_ACK 4`
29			`#define TFTP_ERROR 5`
30
31
32			`static int TftpServerPort; /* The UDP port at their end */`
33			`static int TftpOurPort; /* The UDP port at our end */`
34			`static int TftpTimeoutCount;`
35			`static unsigned TftpBlock;`
36			`static unsigned TftpLastBlock;`
37			`static int TftpState;`
38			`#define STATE_RRQ 1`
39			`#define STATE_DATA 2`
40			`#define STATE_TOO_LARGE 3`
41			`#define STATE_BAD_MAGIC 4`
42
43			`char *tftp_filename;`
44
45	140	julius
46			`// running TFTP CRC value`
47			`unsigned long TFTP_CHKSUM;`
48
49	2	marcus.erl	`#ifdef CFG_DIRECT_FLASH_TFTP`
50			`extern flash_info_t flash_info[CFG_MAX_FLASH_BANKS];`
51			`#endif`
52
53			`static __inline__ void`
54			`store_block (unsigned block, unsigned char * src, unsigned len)`
55			`{`
56			`unsigned long offset = block * 512, newsize = offset + len;`
57			`#ifdef CFG_DIRECT_FLASH_TFTP`
58			`int i, rc = 0;`
59
60			`for (i=0; i<CFG_MAX_FLASH_BANKS; i++) {`
61			`/* start address in flash? */`
62			`if (global.src_addr + offset >= flash_info[i].start[0]) {`
63			`rc = 1;`
64			`break;`
65			`}`
66			`}`
67
68			`if (rc) { /* Flash is destination for this packet */`
69			`rc = flash_write ((unsigned char *)src, (unsigned long)(global.src_addr+offset), len);`
70			`switch (rc) {`
71			`case 0: /* OK */`
72			`break;`
73			`case 1: printf ("Timeout writing to Flash\n");`
74			`break;`
75			`case 2: printf ("Flash not Erased\n");`
76			`break;`
77			`case 4: printf ("Can't write to protected Flash sectors\n");`
78			`break;`
79			`case 8: printf ("Outside available Flash\n");`
80			`break;`
81			`case 16:printf ("Size must be aligned (multiple of 8?)\n");`
82			`break;`
83			`default:`
84			`printf ("%s[%d] FIXME: rc=%d\n",__FILE__,__LINE__,rc);`
85			`break;`
86			`}`
87			`if (rc) {`
88			`NetState = NETLOOP_FAIL;`
89			`return;`
90			`}`
91			`}`
92			`else`
93			`#endif /* CFG_DIRECT_FLASH_TFTP */`
94	140	julius
95			`//#define QUICK_ETHPACKET_COPY`
96			`#ifdef QUICK_ETHPACKET_COPY`
97			`{`
98			`unsigned char * dst = (unsigned char*)(global.src_addr + offset);`
99			`//printf("quick ethpacket copy: src: 0x%x dst: 0x%x, len: %d\n",(unsigned long)src, (unsigned long)dst, len);`
100			`// First, align the destination address so we can copy words`
101			`// If either src or dst are not word aligned, then we will never`
102			`// be able to do word copies`
103			`while((len) && ((((unsigned long)dst) & 0x3) \|\| (((unsigned long)src) & 0x3)))`
104			`{`
105			`// printf("bc: src: 0x%x dst: 0x%x, len: %d\n",(unsigned long)src, (unsigned long)dst, len);`
106			`dst[0] = src[0];`
107			`len--;`
108			`dst++;`
109			`src++;`
110
111			`}`
112			`unsigned long wdst, wsrc;`
113			`wdst = (unsigned long*) dst;`
114			`wsrc = (unsigned long*) src;`
115			`while(len >= 4)`
116			`{`
117			`//printf("wc: src: 0x%x dst: 0x%x, len: %d\n",(unsigned long)src, (unsigned long)dst, len);`
118			`wdst[0] = wsrc[0];`
119			`wdst++; wsrc++;`
120			`len -= 4;`
121			`dst+=4;`
122			`src+=4;`
123
124			`}`
125			`while (len)`
126			`{`
127			`//printf("cu: src: 0x%x dst: 0x%x, len: %d\n",(unsigned long)src, (unsigned long)dst, len);`
128			`dst[0] = src[0];`
129			`len--;`
130			`dst++;`
131			`src++;`
132			`}`
133			`}`
134			`#else`
135
136			`#ifdef TFTP_CALC_CRC`
137			`// Call special memcpy that calculates CRC for us:`
138			`TFTP_CHKSUM += memcpy_crc((void *)(global.src_addr + offset), src, len);`
139			`#else`
140			`// Standard memcpy:`
141	2	marcus.erl	`(void)memcpy((void *)(global.src_addr + offset), src, len);`
142	140	julius	`#endif`
143
144	2	marcus.erl
145	140	julius	`#endif`
146
147	2	marcus.erl	`if (NetBootFileXferSize < newsize)`
148			`NetBootFileXferSize = newsize;`
149			`}`
150
151			`static void TftpSend (void);`
152			`static void TftpTimeout (void);`
153
154			`/**********************************************************************/`
155
156			`static void`
157			`TftpSend (void)`
158			`{`
159			`volatile unsigned char * pkt;`
160			`volatile unsigned char * xp;`
161			`int len = 0;`
162
163	140	julius	`#ifdef ET_DEBUG`
164			`//printf("TftpSend: %d\n", TftpState);`
165			`#endif`
166
167
168	2	marcus.erl	`/*`
169			`* We will always be sending some sort of packet, so`
170			`* cobble together the packet headers now.`
171			`*/`
172			`pkt = NetTxPacket + ETHER_HDR_SIZE + IP_HDR_SIZE;`
173
174			`switch (TftpState) {`
175
176			`case STATE_RRQ:`
177			`xp = pkt;`
178	140	julius	`(((unsigned short )pkt)) = SWAP16c(TFTP_RRQ);`
179			`pkt += sizeof(short);`
180	2	marcus.erl	`strcpy ((char *)pkt, tftp_filename);`
181			`pkt += strlen(tftp_filename) + 1;`
182			`strcpy ((char *)pkt, "octet");`
183			`pkt += 5 /strlen("octet")/ + 1;`
184			`len = pkt - xp;`
185	140	julius
186	2	marcus.erl	`break;`
187
188			`case STATE_DATA:`
189			`xp = pkt;`
190	140	julius	`((unsigned short )pkt) = SWAP16c(TFTP_ACK);`
191			`pkt += sizeof(short);`
192			`((unsigned short )pkt) = SWAP16(TftpBlock);`
193			`pkt += sizeof(short);`
194	2	marcus.erl	`len = pkt - xp;`
195			`break;`
196
197			`case STATE_TOO_LARGE:`
198			`xp = pkt;`
199	140	julius	`((unsigned short )pkt) = SWAP16c(TFTP_ERROR);`
200			`pkt += sizeof(short);`
201			`((unsigned short )pkt) = SWAP16(3);`
202			`pkt += sizeof(short);`
203	2	marcus.erl	`strcpy ((char *)pkt, "File too large");`
204			`pkt += 14 /strlen("File too large")/ + 1;`
205			`len = pkt - xp;`
206			`break;`
207
208			`case STATE_BAD_MAGIC:`
209			`xp = pkt;`
210	140	julius	`((unsigned short )pkt) = SWAP16c(TFTP_ERROR);`
211			`pkt += sizeof(short);`
212			`((unsigned short )pkt) = SWAP16(2);`
213			`pkt += sizeof(short);`
214	2	marcus.erl	`strcpy ((char *)pkt, "File has bad magic");`
215			`pkt += 18 /strlen("File has bad magic")/ + 1;`
216			`len = pkt - xp;`
217			`break;`
218			`}`
219
220			`NetSetEther (NetTxPacket, NetServerEther, PROT_IP);`
221			`NetSetIP (NetTxPacket + ETHER_HDR_SIZE, NetServerIP,`
222			`TftpServerPort, TftpOurPort, len);`
223			`NetSendPacket (NetTxPacket, ETHER_HDR_SIZE + IP_HDR_SIZE + len);`
224	140	julius
225	2	marcus.erl	`}`
226
227
228			`static void`
229			`TftpHandler (unsigned char * pkt, unsigned dest, unsigned src, unsigned len)`
230			`{`
231	140	julius	`#ifdef ET_DEBUG`
232			`// printf("TftpHandler\n");`
233			`#endif`
234	2	marcus.erl	`if (dest != TftpOurPort) {`
235			`return;`
236			`}`
237			`if (TftpState != STATE_RRQ && src != TftpServerPort) {`
238			`return;`
239			`}`
240
241			`if (len < 2) {`
242			`return;`
243			`}`
244			`len -= 2;`
245	140	julius	`switch (SWAP16(((unsigned short )pkt))) {`
246	2	marcus.erl
247			`case TFTP_RRQ:`
248			`case TFTP_WRQ:`
249			`case TFTP_ACK:`
250	140	julius	`pkt += sizeof(short);`
251	2	marcus.erl	`break;`
252			`default:`
253			`break;`
254
255			`case TFTP_DATA:`
256	140	julius	`pkt += sizeof(short);`
257	2	marcus.erl	`if (len < 2)`
258			`return;`
259			`len -= 2;`
260			`TftpBlock = SWAP16((unsigned short )pkt);`
261			`if (((TftpBlock - 1) % 10) == 0) {`
262			`putc ('#');`
263			`TftpTimeoutCount = 0;`
264			`} else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0) {`
265			`printf ("\n\t ");`
266			`}`
267
268			`if (TftpState == STATE_RRQ) {`
269			`TftpState = STATE_DATA;`
270			`TftpServerPort = src;`
271			`TftpLastBlock = 0;`
272
273			`if (TftpBlock != 1) { /* Assertion */`
274			`printf ("\nTFTP error: "`
275			`"First block is not block 1 (%d)\n"`
276			`"Starting again\n\n",`
277			`TftpBlock);`
278			`NetStartAgain ();`
279			`break;`
280			`}`
281			`}`
282
283			`if (TftpBlock == TftpLastBlock) {`
284			`/*`
285			`* Same block again; ignore it.`
286			`*/`
287			`break;`
288			`}`
289
290			`TftpLastBlock = TftpBlock;`
291			`NetSetTimeout (TIMEOUT * TICKS_PER_SEC, TftpTimeout);`
292
293			`store_block (TftpBlock - 1, pkt + 2, len);`
294
295			`/*`
296			`* Acknoledge the block just received, which will prompt`
297			`* the server for the next one.`
298			`*/`
299			`TftpSend ();`
300
301			`if (len < 512) {`
302			`/*`
303			`* We received the whole thing. Try to`
304			`* run it.`
305			`*/`
306			`printf ("\ndone\n");`
307			`NetState = NETLOOP_SUCCESS;`
308			`}`
309			`break;`
310
311			`case TFTP_ERROR:`
312	140	julius	`pkt += sizeof(short);`
313	2	marcus.erl	`printf ("\nTFTP error: '%s' (%d)\n",`
314	140	julius	`pkt + 2, SWAP16((unsigned short )pkt));`
315	2	marcus.erl	`printf ("Starting again\n\n");`
316			`NetStartAgain ();`
317			`break;`
318			`}`
319	140	julius
320	2	marcus.erl	`}`
321
322
323			`static void`
324			`TftpTimeout (void)`
325			`{`
326			`if (++TftpTimeoutCount >= TIMEOUT_COUNT) {`
327			`printf ("\nRetry count exceeded; starting again\n");`
328			`NetStartAgain ();`
329			`} else {`
330			`printf ("T ");`
331			`NetSetTimeout (TIMEOUT * TICKS_PER_SEC, TftpTimeout);`
332			`TftpSend ();`
333			`}`
334			`}`
335
336
337			`void`
338			`TftpStart (void)`
339			`{`
340			`#ifdef ET_DEBUG`
341			`printf ("\nServer ethernet address %02x:%02x:%02x:%02x:%02x:%02x\n",`
342			`NetServerEther[0],`
343			`NetServerEther[1],`
344			`NetServerEther[2],`
345			`NetServerEther[3],`
346			`NetServerEther[4],`
347			`NetServerEther[5]`
348			`);`
349			`#endif /* DEBUG */`
350
351	140	julius	`TFTP_CHKSUM = 0; // Reset checksum`
352
353	2	marcus.erl	`printf ("TFTP from server "); print_IPaddr (NetServerIP);`
354			`printf ("; our IP address is "); print_IPaddr (NetOurIP);`
355
356			`// Check if we need to send across this subnet`
357			`if (NetOurGatewayIP && NetOurSubnetMask) {`
358			`IPaddr_t OurNet = NetOurIP & NetOurSubnetMask;`
359			`IPaddr_t ServerNet = NetServerIP & NetOurSubnetMask;`
360
361			`if (OurNet != ServerNet) {`
362			`printf ("; sending through gateway ");`
363			`print_IPaddr (NetOurGatewayIP) ;`
364			`}`
365			`}`
366			`putc ('\n');`
367
368			`printf ("Filename '%s'.", tftp_filename);`
369
370			`if (NetBootFileSize) {`
371			`printf (" Size is %d%s kB => %x Bytes",`
372			`NetBootFileSize/2,`
373			`(NetBootFileSize%2) ? ".5" : "",`
374			`NetBootFileSize<<9);`
375			`}`
376
377			`putc ('\n');`
378
379			`printf ("Load address: 0x%lx\n", global.src_addr);`
380
381			`printf ("Loading: *\b");`
382
383			`NetSetTimeout (TIMEOUT * TICKS_PER_SEC, TftpTimeout);`
384			`NetSetHandler (TftpHandler);`
385
386			`TftpServerPort = WELL_KNOWN_PORT;`
387			`TftpTimeoutCount = 0;`
388			`TftpState = STATE_RRQ;`
389			`TftpOurPort = 1024 + (get_timer(0) % 3072);`
390
391			`TftpSend ();`
392			`}`
393

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