common/cmd_load.c

   1 /*
   2  * (C) Copyright 2000-2003
   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 /*
  25  * Serial up- and download support
  26  */
  27 #include <common.h>
  28 #include <command.h>
  29 #include <s_record.h>
  30 #include <net.h>
  31 #include <syscall.h>
  32
  33
  34 #if (CONFIG_COMMANDS & CFG_CMD_LOADS)
  35 static ulong load_serial (ulong offset);
  36 static int read_record (char *buf, ulong len);
  37 # if (CONFIG_COMMANDS & CFG_CMD_SAVES)
  38 static int save_serial (ulong offset, ulong size);
  39 static int write_record (char *buf);
  40 # endif /* CFG_CMD_SAVES */
  41
  42 static int do_echo = 1;
  43 #endif /* CFG_CMD_LOADS */
  44
  45 /* -------------------------------------------------------------------- */
  46
  47 #if (CONFIG_COMMANDS & CFG_CMD_LOADS)
  48 int do_load_serial (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  49 {
  50         ulong offset = 0;
  51         ulong addr;
  52         int i;
  53         char *env_echo;
  54         int rcode = 0;
  55 #ifdef  CFG_LOADS_BAUD_CHANGE
  56         DECLARE_GLOBAL_DATA_PTR;
  57         int load_baudrate, current_baudrate;
  58
  59         load_baudrate = current_baudrate = gd->baudrate;
  60 #endif
  61
  62         if (((env_echo = getenv("loads_echo")) != NULL) && (*env_echo == '1')) {
  63                 do_echo = 1;
  64         } else {
  65                 do_echo = 0;
  66         }
  67
  68 #ifdef  CFG_LOADS_BAUD_CHANGE
  69         if (argc >= 2) {
  70                 offset = simple_strtoul(argv[1], NULL, 16);
  71         }
  72         if (argc == 3) {
  73                 load_baudrate = (int)simple_strtoul(argv[2], NULL, 10);
  74
  75                 /* default to current baudrate */
  76                 if (load_baudrate == 0)
  77                         load_baudrate = current_baudrate;
  78         }
  79         if (load_baudrate != current_baudrate) {
  80                 printf ("## Switch baudrate to %d bps and press ENTER ...\n",
  81                         load_baudrate);
  82                 udelay(50000);
  83                 gd->baudrate = load_baudrate;
  84                 serial_setbrg ();
  85                 udelay(50000);
  86                 for (;;) {
  87                         if (getc() == '\r')
  88                                 break;
  89                 }
  90         }
  91 #else   /* ! CFG_LOADS_BAUD_CHANGE */
  92         if (argc == 2) {
  93                 offset = simple_strtoul(argv[1], NULL, 16);
  94         }
  95 #endif  /* CFG_LOADS_BAUD_CHANGE */
  96
  97         printf ("## Ready for S-Record download ...\n");
  98
  99         addr = load_serial (offset);
 100
 101         /*
 102          * Gather any trailing characters (for instance, the ^D which
 103          * is sent by 'cu' after sending a file), and give the
 104          * box some time (100 * 1 ms)
 105          */
 106         for (i=0; i<100; ++i) {
 107                 if (serial_tstc()) {
 108                         (void) serial_getc();
 109                 }
 110                 udelay(1000);
 111         }
 112
 113         if (addr == ~0) {
 114                 printf ("## S-Record download aborted\n");
 115                 rcode = 1;
 116         } else {
 117                 printf ("## Start Addr      = 0x%08lX\n", addr);
 118                 load_addr = addr;
 119         }
 120
 121 #ifdef  CFG_LOADS_BAUD_CHANGE
 122         if (load_baudrate != current_baudrate) {
 123                 printf ("## Switch baudrate to %d bps and press ESC ...\n",
 124                         current_baudrate);
 125                 udelay (50000);
 126                 gd->baudrate = current_baudrate;
 127                 serial_setbrg ();
 128                 udelay (50000);
 129                 for (;;) {
 130                         if (getc() == 0x1B) /* ESC */
 131                                 break;
 132                 }
 133         }
 134 #endif
 135         return rcode;
 136 }
 137
 138 static ulong
 139 load_serial (ulong offset)
 140 {
 141         char    record[SREC_MAXRECLEN + 1];     /* buffer for one S-Record      */
 142         char    binbuf[SREC_MAXBINLEN];         /* buffer for binary data       */
 143         int     binlen;                         /* no. of data bytes in S-Rec.  */
 144         int     type;                           /* return code for record type  */
 145         ulong   addr;                           /* load address from S-Record   */
 146         ulong   size;                           /* number of bytes transferred  */
 147         char    buf[32];
 148         ulong   store_addr;
 149         ulong   start_addr = ~0;
 150         ulong   end_addr   =  0;
 151         int     line_count =  0;
 152
 153         while (read_record(record, SREC_MAXRECLEN + 1) >= 0) {
 154                 type = srec_decode (record, &binlen, &addr, binbuf);
 155
 156                 if (type < 0) {
 157                         return (~0);            /* Invalid S-Record             */
 158                 }
 159
 160                 switch (type) {
 161                 case SREC_DATA2:
 162                 case SREC_DATA3:
 163                 case SREC_DATA4:
 164                     store_addr = addr + offset;
 165 #ifndef CFG_NO_FLASH
 166                     if (addr2info(store_addr)) {
 167                         int rc;
 168
 169                         rc = flash_write((uchar *)binbuf,store_addr,binlen);
 170                         if (rc != 0) {
 171                                 flash_perror (rc);
 172                                 return (~0);
 173                         }
 174                     } else
 175 #endif
 176                     {
 177                         memcpy ((char *)(store_addr), binbuf, binlen);
 178                     }
 179                     if ((store_addr) < start_addr)
 180                         start_addr = store_addr;
 181                     if ((store_addr + binlen - 1) > end_addr)
 182                         end_addr = store_addr + binlen - 1;
 183                     break;
 184                 case SREC_END2:
 185                 case SREC_END3:
 186                 case SREC_END4:
 187                     udelay (10000);
 188                     size = end_addr - start_addr + 1;
 189                     printf ("\n"
 190                             "## First Load Addr = 0x%08lX\n"
 191                             "## Last  Load Addr = 0x%08lX\n"
 192                             "## Total Size      = 0x%08lX = %ld Bytes\n",
 193                             start_addr, end_addr, size, size
 194                     );
 195                     flush_cache (addr, size);
 196                     sprintf(buf, "%lX", size);
 197                     setenv("filesize", buf);
 198                     return (addr);
 199                 case SREC_START:
 200                     break;
 201                 default:
 202                     break;
 203                 }
 204                 if (!do_echo) { /* print a '.' every 100 lines */
 205                         if ((++line_count % 100) == 0)
 206                                 putc ('.');
 207                 }
 208         }
 209
 210         return (~0);                    /* Download aborted             */
 211 }
 212
 213 static int
 214 read_record (char *buf, ulong len)
 215 {
 216         char *p;
 217         char c;
 218
 219         --len;  /* always leave room for terminating '\0' byte */
 220
 221         for (p=buf; p < buf+len; ++p) {
 222                 c = serial_getc();              /* read character               */
 223                 if (do_echo)
 224                         serial_putc (c);        /* ... and echo it              */
 225
 226                 switch (c) {
 227                 case '\r':
 228                 case '\n':
 229                         *p = '\0';
 230                         return (p - buf);
 231                 case '\0':
 232                 case 0x03:                      /* ^C - Control C               */
 233                         return (-1);
 234                 default:
 235                         *p = c;
 236                 }
 237
 238             /* Check for the console hangup (if any different from serial) */
 239 #ifdef CONFIG_PPC       /* we don't have syscall_tbl anywhere else */
 240             if (syscall_tbl[SYSCALL_GETC] != serial_getc) {
 241                 if (ctrlc()) {
 242                     return (-1);
 243                 }
 244             }
 245 #endif
 246         }
 247
 248         /* line too long - truncate */
 249         *p = '\0';
 250         return (p - buf);
 251 }
 252
 253 #if (CONFIG_COMMANDS & CFG_CMD_SAVES)
 254
 255 int do_save_serial (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 256 {
 257         ulong offset = 0;
 258         ulong size   = 0;
 259 #ifdef  CFG_LOADS_BAUD_CHANGE
 260         DECLARE_GLOBAL_DATA_PTR;
 261         int save_baudrate, current_baudrate;
 262
 263         save_baudrate = current_baudrate = gd->baudrate;
 264 #endif
 265
 266         if (argc >= 2) {
 267                 offset = simple_strtoul(argv[1], NULL, 16);
 268         }
 269 #ifdef  CFG_LOADS_BAUD_CHANGE
 270         if (argc >= 3) {
 271                 size = simple_strtoul(argv[2], NULL, 16);
 272         }
 273         if (argc == 4) {
 274                 save_baudrate = (int)simple_strtoul(argv[3], NULL, 10);
 275
 276                 /* default to current baudrate */
 277                 if (save_baudrate == 0)
 278                         save_baudrate = current_baudrate;
 279         }
 280         if (save_baudrate != current_baudrate) {
 281                 printf ("## Switch baudrate to %d bps and press ENTER ...\n",
 282                         save_baudrate);
 283                 udelay(50000);
 284                 gd->baudrate = save_baudrate;
 285                 serial_setbrg ();
 286                 udelay(50000);
 287                 for (;;) {
 288                         if (getc() == '\r')
 289                                 break;
 290                 }
 291         }
 292 #else   /* ! CFG_LOADS_BAUD_CHANGE */
 293         if (argc == 3) {
 294                 size = simple_strtoul(argv[2], NULL, 16);
 295         }
 296 #endif  /* CFG_LOADS_BAUD_CHANGE */
 297
 298         printf ("## Ready for S-Record upload, press ENTER to proceed ...\n");
 299         for (;;) {
 300                 if (getc() == '\r')
 301                         break;
 302         }
 303         if(save_serial (offset, size)) {
 304                 printf ("## S-Record upload aborted\n");
 305         } else {
 306                 printf ("## S-Record upload complete\n");
 307         }
 308 #ifdef  CFG_LOADS_BAUD_CHANGE
 309         if (save_baudrate != current_baudrate) {
 310                 printf ("## Switch baudrate to %d bps and press ESC ...\n",
 311                         (int)current_baudrate);
 312                 udelay (50000);
 313                 gd->baudrate = current_baudrate;
 314                 serial_setbrg ();
 315                 udelay (50000);
 316                 for (;;) {
 317                         if (getc() == 0x1B) /* ESC */
 318                                 break;
 319                 }
 320         }
 321 #endif
 322         return 0;
 323 }
 324
 325 #define SREC3_START                             "S0030000FC\n"
 326 #define SREC3_FORMAT                    "S3%02X%08lX%s%02X\n"
 327 #define SREC3_END                               "S70500000000FA\n"
 328 #define SREC_BYTES_PER_RECORD   16
 329
 330 static int save_serial (ulong address, ulong count)
 331 {
 332         int i, c, reclen, checksum, length;
 333         char *hex = "0123456789ABCDEF";
 334         char    record[2*SREC_BYTES_PER_RECORD+16];     /* buffer for one S-Record      */
 335         char    data[2*SREC_BYTES_PER_RECORD+1];        /* buffer for hex data  */
 336
 337         reclen = 0;
 338         checksum  = 0;
 339
 340         if(write_record(SREC3_START))                   /* write the header */
 341                 return (-1);
 342         do {
 343                 if(count) {                                             /* collect hex data in the buffer  */
 344                         c = *(volatile uchar*)(address + reclen);       /* get one byte    */
 345                         checksum += c;                                                  /* accumulate checksum */
 346                         data[2*reclen]   = hex[(c>>4)&0x0f];
 347                         data[2*reclen+1] = hex[c & 0x0f];
 348                         data[2*reclen+2] = '\0';
 349                         ++reclen;
 350                         --count;
 351                 }
 352                 if(reclen == SREC_BYTES_PER_RECORD || count == 0) {
 353                         /* enough data collected for one record: dump it */
 354                         if(reclen) {    /* build & write a data record: */
 355                                 /* address + data + checksum */
 356                                 length = 4 + reclen + 1;
 357
 358                                 /* accumulate length bytes into checksum */
 359                                 for(i = 0; i < 2; i++)
 360                                         checksum += (length >> (8*i)) & 0xff;
 361
 362                                 /* accumulate address bytes into checksum: */
 363                                 for(i = 0; i < 4; i++)
 364                                         checksum += (address >> (8*i)) & 0xff;
 365
 366                                 /* make proper checksum byte: */
 367                                 checksum = ~checksum & 0xff;
 368
 369                                 /* output one record: */
 370                                 sprintf(record, SREC3_FORMAT, length, address, data, checksum);
 371                                 if(write_record(record))
 372                                         return (-1);
 373                         }
 374                         address  += reclen;  /* increment address */
 375                         checksum  = 0;
 376                         reclen    = 0;
 377                 }
 378         }
 379         while(count);
 380         if(write_record(SREC3_END))     /* write the final record */
 381                 return (-1);
 382         return(0);
 383 }
 384
 385 static int
 386 write_record (char *buf)
 387 {
 388         char c;
 389
 390         while((c = *buf++))
 391                 serial_putc(c);
 392
 393         /* Check for the console hangup (if any different from serial) */
 394
 395         if (ctrlc()) {
 396             return (-1);
 397         }
 398         return (0);
 399 }
 400 # endif /* CFG_CMD_SAVES */
 401
 402 #endif  /* CFG_CMD_LOADS */
 403
 404
 405 #if (CONFIG_COMMANDS & CFG_CMD_LOADB)  /* loadb command (load binary) included */
 406
 407 #define XON_CHAR        17
 408 #define XOFF_CHAR       19
 409 #define START_CHAR      0x01
 410 #define ETX_CHAR        0x03
 411 #define END_CHAR        0x0D
 412 #define SPACE           0x20
 413 #define K_ESCAPE        0x23
 414 #define SEND_TYPE       'S'
 415 #define DATA_TYPE       'D'
 416 #define ACK_TYPE        'Y'
 417 #define NACK_TYPE       'N'
 418 #define BREAK_TYPE      'B'
 419 #define tochar(x) ((char) (((x) + SPACE) & 0xff))
 420 #define untochar(x) ((int) (((x) - SPACE) & 0xff))
 421
 422 extern int os_data_count;
 423 extern int os_data_header[8];
 424
 425 static void set_kerm_bin_mode(unsigned long *);
 426 static int k_recv(void);
 427 static ulong load_serial_bin (ulong offset);
 428
 429
 430 char his_eol;        /* character he needs at end of packet */
 431 int  his_pad_count;  /* number of pad chars he needs */
 432 char his_pad_char;   /* pad chars he needs */
 433 char his_quote;      /* quote chars he'll use */
 434
 435 int do_load_serial_bin (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 436 {
 437         DECLARE_GLOBAL_DATA_PTR;
 438
 439         ulong offset = 0;
 440         ulong addr;
 441         int load_baudrate, current_baudrate;
 442         int rcode = 0;
 443         char *s;
 444
 445         /* pre-set offset from CFG_LOAD_ADDR */
 446         offset = CFG_LOAD_ADDR;
 447
 448         /* pre-set offset from $loadaddr */
 449         if ((s = getenv("loadaddr")) != NULL) {
 450                 offset = simple_strtoul(s, NULL, 16);
 451         }
 452
 453         load_baudrate = current_baudrate = gd->baudrate;
 454
 455         if (argc >= 2) {
 456                 offset = simple_strtoul(argv[1], NULL, 16);
 457         }
 458         if (argc == 3) {
 459                 load_baudrate = (int)simple_strtoul(argv[2], NULL, 10);
 460
 461                 /* default to current baudrate */
 462                 if (load_baudrate == 0)
 463                         load_baudrate = current_baudrate;
 464         }
 465
 466         if (load_baudrate != current_baudrate) {
 467                 printf ("## Switch baudrate to %d bps and press ENTER ...\n",
 468                         load_baudrate);
 469                 udelay(50000);
 470                 gd->baudrate = load_baudrate;
 471                 serial_setbrg ();
 472                 udelay(50000);
 473                 for (;;) {
 474                         if (getc() == '\r')
 475                                 break;
 476                 }
 477         }
 478
 479         printf ("## Ready for binary (kermit) download "
 480                 "to 0x%08lX at %d bps...\n",
 481                 offset,
 482                 current_baudrate);
 483         addr = load_serial_bin (offset);
 484
 485         if (addr == ~0) {
 486                 load_addr = 0;
 487                 printf ("## Binary (kermit) download aborted\n");
 488                 rcode = 1;
 489         } else {
 490                 printf ("## Start Addr      = 0x%08lX\n", addr);
 491                 load_addr = addr;
 492         }
 493
 494         if (load_baudrate != current_baudrate) {
 495                 printf ("## Switch baudrate to %d bps and press ESC ...\n",
 496                         current_baudrate);
 497                 udelay (50000);
 498                 gd->baudrate = current_baudrate;
 499                 serial_setbrg ();
 500                 udelay (50000);
 501                 for (;;) {
 502                         if (getc() == 0x1B) /* ESC */
 503                                 break;
 504                 }
 505         }
 506
 507 #ifdef CONFIG_AUTOSCRIPT
 508         if (load_addr) {
 509                 char *s;
 510
 511                 if (((s = getenv("autoscript")) != NULL) && (strcmp(s,"yes") == 0)) {
 512                         printf("Running autoscript at addr 0x%08lX ...\n", load_addr);
 513                         rcode = autoscript (load_addr);
 514                 }
 515         }
 516 #endif
 517         return rcode;
 518 }
 519
 520
 521 static ulong load_serial_bin (ulong offset)
 522 {
 523         int size, i;
 524         char buf[32];
 525
 526         set_kerm_bin_mode ((ulong *) offset);
 527         size = k_recv ();
 528
 529         /*
 530          * Gather any trailing characters (for instance, the ^D which
 531          * is sent by 'cu' after sending a file), and give the
 532          * box some time (100 * 1 ms)
 533          */
 534         for (i=0; i<100; ++i) {
 535                 if (serial_tstc()) {
 536                         (void) serial_getc();
 537                 }
 538                 udelay(1000);
 539         }
 540
 541         flush_cache (offset, size);
 542
 543         printf("## Total Size      = 0x%08x = %d Bytes\n", size, size);
 544         sprintf(buf, "%X", size);
 545         setenv("filesize", buf);
 546
 547         return offset;
 548 }
 549
 550 void send_pad (void)
 551 {
 552         int count = his_pad_count;
 553
 554         while (count-- > 0)
 555                 serial_putc (his_pad_char);
 556 }
 557
 558 /* converts escaped kermit char to binary char */
 559 char ktrans (char in)
 560 {
 561         if ((in & 0x60) == 0x40) {
 562                 return (char) (in & ~0x40);
 563         } else if ((in & 0x7f) == 0x3f) {
 564                 return (char) (in | 0x40);
 565         } else
 566                 return in;
 567 }
 568
 569 int chk1 (char *buffer)
 570 {
 571         int total = 0;
 572
 573         while (*buffer) {
 574                 total += *buffer++;
 575         }
 576         return (int) ((total + ((total >> 6) & 0x03)) & 0x3f);
 577 }
 578
 579 void s1_sendpacket (char *packet)
 580 {
 581         send_pad ();
 582         while (*packet) {
 583                 serial_putc (*packet++);
 584         }
 585 }
 586
 587 static char a_b[24];
 588 void send_ack (int n)
 589 {
 590         a_b[0] = START_CHAR;
 591         a_b[1] = tochar (3);
 592         a_b[2] = tochar (n);
 593         a_b[3] = ACK_TYPE;
 594         a_b[4] = '\0';
 595         a_b[4] = tochar (chk1 (&a_b[1]));
 596         a_b[5] = his_eol;
 597         a_b[6] = '\0';
 598         s1_sendpacket (a_b);
 599 }
 600
 601 void send_nack (int n)
 602 {
 603         a_b[0] = START_CHAR;
 604         a_b[1] = tochar (3);
 605         a_b[2] = tochar (n);
 606         a_b[3] = NACK_TYPE;
 607         a_b[4] = '\0';
 608         a_b[4] = tochar (chk1 (&a_b[1]));
 609         a_b[5] = his_eol;
 610         a_b[6] = '\0';
 611         s1_sendpacket (a_b);
 612 }
 613
 614
 615 /* os_data_* takes an OS Open image and puts it into memory, and
 616    puts the boot header in an array named os_data_header
 617
 618    if image is binary, no header is stored in os_data_header.
 619 */
 620 void (*os_data_init) (void);
 621 void (*os_data_char) (char new_char);
 622 static int os_data_state, os_data_state_saved;
 623 int os_data_count;
 624 static int os_data_count_saved;
 625 static char *os_data_addr, *os_data_addr_saved;
 626 static char *bin_start_address;
 627 int os_data_header[8];
 628 static void bin_data_init (void)
 629 {
 630         os_data_state = 0;
 631         os_data_count = 0;
 632         os_data_addr = bin_start_address;
 633 }
 634 static void os_data_save (void)
 635 {
 636         os_data_state_saved = os_data_state;
 637         os_data_count_saved = os_data_count;
 638         os_data_addr_saved = os_data_addr;
 639 }
 640 static void os_data_restore (void)
 641 {
 642         os_data_state = os_data_state_saved;
 643         os_data_count = os_data_count_saved;
 644         os_data_addr = os_data_addr_saved;
 645 }
 646 static void bin_data_char (char new_char)
 647 {
 648         switch (os_data_state) {
 649         case 0:                                 /* data */
 650                 *os_data_addr++ = new_char;
 651                 --os_data_count;
 652                 break;
 653         }
 654 }
 655 static void set_kerm_bin_mode (unsigned long *addr)
 656 {
 657         bin_start_address = (char *) addr;
 658         os_data_init = bin_data_init;
 659         os_data_char = bin_data_char;
 660 }
 661
 662
 663 /* k_data_* simply handles the kermit escape translations */
 664 static int k_data_escape, k_data_escape_saved;
 665 void k_data_init (void)
 666 {
 667         k_data_escape = 0;
 668         os_data_init ();
 669 }
 670 void k_data_save (void)
 671 {
 672         k_data_escape_saved = k_data_escape;
 673         os_data_save ();
 674 }
 675 void k_data_restore (void)
 676 {
 677         k_data_escape = k_data_escape_saved;
 678         os_data_restore ();
 679 }
 680 void k_data_char (char new_char)
 681 {
 682         if (k_data_escape) {
 683                 /* last char was escape - translate this character */
 684                 os_data_char (ktrans (new_char));
 685                 k_data_escape = 0;
 686         } else {
 687                 if (new_char == his_quote) {
 688                         /* this char is escape - remember */
 689                         k_data_escape = 1;
 690                 } else {
 691                         /* otherwise send this char as-is */
 692                         os_data_char (new_char);
 693                 }
 694         }
 695 }
 696
 697 #define SEND_DATA_SIZE  20
 698 char send_parms[SEND_DATA_SIZE];
 699 char *send_ptr;
 700
 701 /* handle_send_packet interprits the protocol info and builds and
 702    sends an appropriate ack for what we can do */
 703 void handle_send_packet (int n)
 704 {
 705         int length = 3;
 706         int bytes;
 707
 708         /* initialize some protocol parameters */
 709         his_eol = END_CHAR;             /* default end of line character */
 710         his_pad_count = 0;
 711         his_pad_char = '\0';
 712         his_quote = K_ESCAPE;
 713
 714         /* ignore last character if it filled the buffer */
 715         if (send_ptr == &send_parms[SEND_DATA_SIZE - 1])
 716                 --send_ptr;
 717         bytes = send_ptr - send_parms;  /* how many bytes we'll process */
 718         do {
 719                 if (bytes-- <= 0)
 720                         break;
 721                 /* handle MAXL - max length */
 722                 /* ignore what he says - most I'll take (here) is 94 */
 723                 a_b[++length] = tochar (94);
 724                 if (bytes-- <= 0)
 725                         break;
 726                 /* handle TIME - time you should wait for my packets */
 727                 /* ignore what he says - don't wait for my ack longer than 1 second */
 728                 a_b[++length] = tochar (1);
 729                 if (bytes-- <= 0)
 730                         break;
 731                 /* handle NPAD - number of pad chars I need */
 732                 /* remember what he says - I need none */
 733                 his_pad_count = untochar (send_parms[2]);
 734                 a_b[++length] = tochar (0);
 735                 if (bytes-- <= 0)
 736                         break;
 737                 /* handle PADC - pad chars I need */
 738                 /* remember what he says - I need none */
 739                 his_pad_char = ktrans (send_parms[3]);
 740                 a_b[++length] = 0x40;   /* He should ignore this */
 741                 if (bytes-- <= 0)
 742                         break;
 743                 /* handle EOL - end of line he needs */
 744                 /* remember what he says - I need CR */
 745                 his_eol = untochar (send_parms[4]);
 746                 a_b[++length] = tochar (END_CHAR);
 747                 if (bytes-- <= 0)
 748                         break;
 749                 /* handle QCTL - quote control char he'll use */
 750                 /* remember what he says - I'll use '#' */
 751                 his_quote = send_parms[5];
 752                 a_b[++length] = '#';
 753                 if (bytes-- <= 0)
 754                         break;
 755                 /* handle QBIN - 8-th bit prefixing */
 756                 /* ignore what he says - I refuse */
 757                 a_b[++length] = 'N';
 758                 if (bytes-- <= 0)
 759                         break;
 760                 /* handle CHKT - the clock check type */
 761                 /* ignore what he says - I do type 1 (for now) */
 762                 a_b[++length] = '1';
 763                 if (bytes-- <= 0)
 764                         break;
 765                 /* handle REPT - the repeat prefix */
 766                 /* ignore what he says - I refuse (for now) */
 767                 a_b[++length] = 'N';
 768                 if (bytes-- <= 0)
 769                         break;
 770                 /* handle CAPAS - the capabilities mask */
 771                 /* ignore what he says - I only do long packets - I don't do windows */
 772                 a_b[++length] = tochar (2);     /* only long packets */
 773                 a_b[++length] = tochar (0);     /* no windows */
 774                 a_b[++length] = tochar (94);    /* large packet msb */
 775                 a_b[++length] = tochar (94);    /* large packet lsb */
 776         } while (0);
 777
 778         a_b[0] = START_CHAR;
 779         a_b[1] = tochar (length);
 780         a_b[2] = tochar (n);
 781         a_b[3] = ACK_TYPE;
 782         a_b[++length] = '\0';
 783         a_b[length] = tochar (chk1 (&a_b[1]));
 784         a_b[++length] = his_eol;
 785         a_b[++length] = '\0';
 786         s1_sendpacket (a_b);
 787 }
 788
 789 /* k_recv receives a OS Open image file over kermit line */
 790 static int k_recv (void)
 791 {
 792         char new_char;
 793         char k_state, k_state_saved;
 794         int sum;
 795         int done;
 796         int length;
 797         int n, last_n;
 798         int z = 0;
 799         int len_lo, len_hi;
 800
 801         /* initialize some protocol parameters */
 802         his_eol = END_CHAR;             /* default end of line character */
 803         his_pad_count = 0;
 804         his_pad_char = '\0';
 805         his_quote = K_ESCAPE;
 806
 807         /* initialize the k_recv and k_data state machine */
 808         done = 0;
 809         k_state = 0;
 810         k_data_init ();
 811         k_state_saved = k_state;
 812         k_data_save ();
 813         n = 0;                          /* just to get rid of a warning */
 814         last_n = -1;
 815
 816         /* expect this "type" sequence (but don't check):
 817            S: send initiate
 818            F: file header
 819            D: data (multiple)
 820            Z: end of file
 821            B: break transmission
 822          */
 823
 824         /* enter main loop */
 825         while (!done) {
 826                 /* set the send packet pointer to begining of send packet parms */
 827                 send_ptr = send_parms;
 828
 829                 /* With each packet, start summing the bytes starting with the length.
 830                    Save the current sequence number.
 831                    Note the type of the packet.
 832                    If a character less than SPACE (0x20) is received - error.
 833                  */
 834
 835 #if 0
 836                 /* OLD CODE, Prior to checking sequence numbers */
 837                 /* first have all state machines save current states */
 838                 k_state_saved = k_state;
 839                 k_data_save ();
 840 #endif
 841
 842                 /* get a packet */
 843                 /* wait for the starting character or ^C */
 844                 for (;;) {
 845                         switch (serial_getc ()) {
 846                         case START_CHAR:        /* start packet */
 847                                 goto START;
 848                         case ETX_CHAR:          /* ^C waiting for packet */
 849                                 return (0);
 850                         default:
 851                                 ;
 852                         }
 853                 }
 854 START:
 855                 /* get length of packet */
 856                 sum = 0;
 857                 new_char = serial_getc ();
 858                 if ((new_char & 0xE0) == 0)
 859                         goto packet_error;
 860                 sum += new_char & 0xff;
 861                 length = untochar (new_char);
 862                 /* get sequence number */
 863                 new_char = serial_getc ();
 864                 if ((new_char & 0xE0) == 0)
 865                         goto packet_error;
 866                 sum += new_char & 0xff;
 867                 n = untochar (new_char);
 868                 --length;
 869
 870                 /* NEW CODE - check sequence numbers for retried packets */
 871                 /* Note - this new code assumes that the sequence number is correctly
 872                  * received.  Handling an invalid sequence number adds another layer
 873                  * of complexity that may not be needed - yet!  At this time, I'm hoping
 874                  * that I don't need to buffer the incoming data packets and can write
 875                  * the data into memory in real time.
 876                  */
 877                 if (n == last_n) {
 878                         /* same sequence number, restore the previous state */
 879                         k_state = k_state_saved;
 880                         k_data_restore ();
 881                 } else {
 882                         /* new sequence number, checkpoint the download */
 883                         last_n = n;
 884                         k_state_saved = k_state;
 885                         k_data_save ();
 886                 }
 887                 /* END NEW CODE */
 888
 889                 /* get packet type */
 890                 new_char = serial_getc ();
 891                 if ((new_char & 0xE0) == 0)
 892                         goto packet_error;
 893                 sum += new_char & 0xff;
 894                 k_state = new_char;
 895                 --length;
 896                 /* check for extended length */
 897                 if (length == -2) {
 898                         /* (length byte was 0, decremented twice) */
 899                         /* get the two length bytes */
 900                         new_char = serial_getc ();
 901                         if ((new_char & 0xE0) == 0)
 902                                 goto packet_error;
 903                         sum += new_char & 0xff;
 904                         len_hi = untochar (new_char);
 905                         new_char = serial_getc ();
 906                         if ((new_char & 0xE0) == 0)
 907                                 goto packet_error;
 908                         sum += new_char & 0xff;
 909                         len_lo = untochar (new_char);
 910                         length = len_hi * 95 + len_lo;
 911                         /* check header checksum */
 912                         new_char = serial_getc ();
 913                         if ((new_char & 0xE0) == 0)
 914                                 goto packet_error;
 915                         if (new_char != tochar ((sum + ((sum >> 6) & 0x03)) & 0x3f))
 916                                 goto packet_error;
 917                         sum += new_char & 0xff;
 918 /* --length; */ /* new length includes only data and block check to come */
 919                 }
 920                 /* bring in rest of packet */
 921                 while (length > 1) {
 922                         new_char = serial_getc ();
 923                         if ((new_char & 0xE0) == 0)
 924                                 goto packet_error;
 925                         sum += new_char & 0xff;
 926                         --length;
 927                         if (k_state == DATA_TYPE) {
 928                                 /* pass on the data if this is a data packet */
 929                                 k_data_char (new_char);
 930                         } else if (k_state == SEND_TYPE) {
 931                                 /* save send pack in buffer as is */
 932                                 *send_ptr++ = new_char;
 933                                 /* if too much data, back off the pointer */
 934                                 if (send_ptr >= &send_parms[SEND_DATA_SIZE])
 935                                         --send_ptr;
 936                         }
 937                 }
 938                 /* get and validate checksum character */
 939                 new_char = serial_getc ();
 940                 if ((new_char & 0xE0) == 0)
 941                         goto packet_error;
 942                 if (new_char != tochar ((sum + ((sum >> 6) & 0x03)) & 0x3f))
 943                         goto packet_error;
 944                 /* get END_CHAR */
 945                 new_char = serial_getc ();
 946                 if (new_char != END_CHAR) {
 947                   packet_error:
 948                         /* restore state machines */
 949                         k_state = k_state_saved;
 950                         k_data_restore ();
 951                         /* send a negative acknowledge packet in */
 952                         send_nack (n);
 953                 } else if (k_state == SEND_TYPE) {
 954                         /* crack the protocol parms, build an appropriate ack packet */
 955                         handle_send_packet (n);
 956                 } else {
 957                         /* send simple acknowledge packet in */
 958                         send_ack (n);
 959                         /* quit if end of transmission */
 960                         if (k_state == BREAK_TYPE)
 961                                 done = 1;
 962                 }
 963                 ++z;
 964         }
 965         return ((ulong) os_data_addr - (ulong) bin_start_address);
 966 }
 967 #endif  /* CFG_CMD_LOADB */
 968
 969 /* -------------------------------------------------------------------- */
 970
 971 #if (CONFIG_COMMANDS & CFG_CMD_LOADS)
 972
 973 #ifdef  CFG_LOADS_BAUD_CHANGE
 974 U_BOOT_CMD(
 975         loads, 3, 0,    do_load_serial,
 976         "loads   - load S-Record file over serial line\n",
 977         "[ off ] [ baud ]\n"
 978         "    - load S-Record file over serial line"
 979         " with offset 'off' and baudrate 'baud'\n"
 980 );
 981
 982 #else   /* ! CFG_LOADS_BAUD_CHANGE */
 983 U_BOOT_CMD(
 984         loads, 2, 0,    do_load_serial,
 985         "loads   - load S-Record file over serial line\n",
 986         "[ off ]\n"
 987         "    - load S-Record file over serial line with offset 'off'\n"
 988 );
 989 #endif  /* CFG_LOADS_BAUD_CHANGE */
 990
 991 /*
 992  * SAVES always requires LOADS support, but not vice versa
 993  */
 994
 995
 996 #if (CONFIG_COMMANDS & CFG_CMD_SAVES)
 997 #ifdef  CFG_LOADS_BAUD_CHANGE
 998 U_BOOT_CMD(
 999         saves, 4, 0,    do_save_serial,
1000         "saves   - save S-Record file over serial line\n",
1001         "[ off ] [size] [ baud ]\n"
1002         "    - save S-Record file over serial line"
1003         " with offset 'off', size 'size' and baudrate 'baud'\n"
1004 );
1005 #else   /* ! CFG_LOADS_BAUD_CHANGE */
1006 U_BOOT_CMD(
1007         saves, 3, 0,    do_save_serial,
1008         "saves   - save S-Record file over serial line\n",
1009         "[ off ] [size]\n"
1010         "    - save S-Record file over serial line with offset 'off' and size 'size'\n"
1011 );
1012 #endif  /* CFG_LOADS_BAUD_CHANGE */
1013 #endif  /* CFG_CMD_SAVES */
1014 #endif  /* CFG_CMD_LOADS */
1015
1016
1017 #if (CONFIG_COMMANDS & CFG_CMD_LOADB)
1018 U_BOOT_CMD(
1019         loadb, 3, 0,    do_load_serial_bin,
1020         "loadb   - load binary file over serial line (kermit mode)\n",
1021         "[ off ] [ baud ]\n"
1022         "    - load binary file over serial line"
1023         " with offset 'off' and baudrate 'baud'\n"
1024 );
1025
1026 #endif  /* CFG_CMD_LOADB */
1027
1028 /* -------------------------------------------------------------------- */
1029
1030 #if (CONFIG_COMMANDS & CFG_CMD_HWFLOW)
1031 int do_hwflow (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
1032 {
1033         extern int hwflow_onoff(int);
1034
1035         if (argc == 2) {
1036                 if (strcmp(argv[1], "off") == 0)
1037                         hwflow_onoff(-1);
1038                 else
1039                         if (strcmp(argv[1], "on") == 0)
1040                                 hwflow_onoff(1);
1041                         else
1042                                 printf("Usage: %s\n", cmdtp->usage);
1043         }
1044         printf("RTS/CTS hardware flow control: %s\n", hwflow_onoff(0) ? "on" : "off");
1045         return 0;
1046 }
1047
1048 /* -------------------------------------------------------------------- */
1049
1050 U_BOOT_CMD(
1051         hwflow [on|off], 2, 0,  do_hwflow,
1052         "hwflow  - turn the harwdare flow control on/off\n",
1053         "\n - change RTS/CTS hardware flow control over serial line\n"
1054 );
1055
1056 #endif /* CFG_CMD_HWFLOW */