cmd_load.c 25.3 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
/*
 * (C) Copyright 2000-2004
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * Serial up- and download support
 */
#include <common.h>
#include <command.h>
#include <s_record.h>
#include <net.h>
#include <exports.h>
#include <xyzModem.h>

DECLARE_GLOBAL_DATA_PTR;

#if defined(CONFIG_CMD_LOADB)
static ulong load_serial_ymodem(ulong offset, int mode);
#endif

#if defined(CONFIG_CMD_LOADS)
static ulong load_serial(long offset);
static int read_record(char *buf, ulong len);
# if defined(CONFIG_CMD_SAVES)
static int save_serial(ulong offset, ulong size);
static int write_record(char *buf);
#endif

static int do_echo = 1;
#endif

/* -------------------------------------------------------------------- */

#if defined(CONFIG_CMD_LOADS)
static int do_load_serial(cmd_tbl_t *cmdtp, int flag, int argc,
			  char * const argv[])
{
	long offset = 0;
	ulong addr;
	int i;
	char *env_echo;
	int rcode = 0;
#ifdef	CONFIG_SYS_LOADS_BAUD_CHANGE
	int load_baudrate, current_baudrate;

	load_baudrate = current_baudrate = gd->baudrate;
#endif

	if (((env_echo = getenv("loads_echo")) != NULL) && (*env_echo == '1')) {
		do_echo = 1;
	} else {
		do_echo = 0;
	}

#ifdef	CONFIG_SYS_LOADS_BAUD_CHANGE
	if (argc >= 2) {
		offset = simple_strtol(argv[1], NULL, 16);
	}
	if (argc == 3) {
		load_baudrate = (int)simple_strtoul(argv[2], NULL, 10);

		/* default to current baudrate */
		if (load_baudrate == 0)
			load_baudrate = current_baudrate;
	}
	if (load_baudrate != current_baudrate) {
		printf("## Switch baudrate to %d bps and press ENTER ...\n",
			load_baudrate);
		udelay(50000);
		gd->baudrate = load_baudrate;
		serial_setbrg();
		udelay(50000);
		for (;;) {
			if (getc() == '\r')
				break;
		}
	}
#else	/* ! CONFIG_SYS_LOADS_BAUD_CHANGE */
	if (argc == 2) {
		offset = simple_strtol(argv[1], NULL, 16);
	}
#endif	/* CONFIG_SYS_LOADS_BAUD_CHANGE */

	printf("## Ready for S-Record download ...\n");

	addr = load_serial(offset);

	/*
	 * Gather any trailing characters (for instance, the ^D which
	 * is sent by 'cu' after sending a file), and give the
	 * box some time (100 * 1 ms)
	 */
	for (i=0; i<100; ++i) {
		if (tstc()) {
			(void) getc();
		}
		udelay(1000);
	}

	if (addr == ~0) {
		printf("## S-Record download aborted\n");
		rcode = 1;
	} else {
		printf("## Start Addr      = 0x%08lX\n", addr);
		load_addr = addr;
	}

#ifdef	CONFIG_SYS_LOADS_BAUD_CHANGE
	if (load_baudrate != current_baudrate) {
		printf("## Switch baudrate to %d bps and press ESC ...\n",
			current_baudrate);
		udelay(50000);
		gd->baudrate = current_baudrate;
		serial_setbrg();
		udelay(50000);
		for (;;) {
			if (getc() == 0x1B) /* ESC */
				break;
		}
	}
#endif
	return rcode;
}

static ulong load_serial(long offset)
{
	char	record[SREC_MAXRECLEN + 1];	/* buffer for one S-Record	*/
	char	binbuf[SREC_MAXBINLEN];		/* buffer for binary data	*/
	int	binlen;				/* no. of data bytes in S-Rec.	*/
	int	type;				/* return code for record type	*/
	ulong	addr;				/* load address from S-Record	*/
	ulong	size;				/* number of bytes transferred	*/
	ulong	store_addr;
	ulong	start_addr = ~0;
	ulong	end_addr   =  0;
	int	line_count =  0;

	while (read_record(record, SREC_MAXRECLEN + 1) >= 0) {
		type = srec_decode(record, &binlen, &addr, binbuf);

		if (type < 0) {
			return (~0);		/* Invalid S-Record		*/
		}

		switch (type) {
		case SREC_DATA2:
		case SREC_DATA3:
		case SREC_DATA4:
		    store_addr = addr + offset;
#ifndef CONFIG_SYS_NO_FLASH
		    if (addr2info(store_addr)) {
			int rc;

			rc = flash_write((char *)binbuf,store_addr,binlen);
			if (rc != 0) {
				flash_perror(rc);
				return (~0);
			}
		    } else
#endif
		    {
			memcpy((char *)(store_addr), binbuf, binlen);
		    }
		    if ((store_addr) < start_addr)
			start_addr = store_addr;
		    if ((store_addr + binlen - 1) > end_addr)
			end_addr = store_addr + binlen - 1;
		    break;
		case SREC_END2:
		case SREC_END3:
		case SREC_END4:
		    udelay(10000);
		    size = end_addr - start_addr + 1;
		    printf("\n"
			    "## First Load Addr = 0x%08lX\n"
			    "## Last  Load Addr = 0x%08lX\n"
			    "## Total Size      = 0x%08lX = %ld Bytes\n",
			    start_addr, end_addr, size, size
		    );
		    flush_cache(start_addr, size);
		    setenv_hex("filesize", size);
		    return (addr);
		case SREC_START:
		    break;
		default:
		    break;
		}
		if (!do_echo) {	/* print a '.' every 100 lines */
			if ((++line_count % 100) == 0)
				putc('.');
		}
	}

	return (~0);			/* Download aborted		*/
}

static int read_record(char *buf, ulong len)
{
	char *p;
	char c;

	--len;	/* always leave room for terminating '\0' byte */

	for (p=buf; p < buf+len; ++p) {
		c = getc();		/* read character		*/
		if (do_echo)
			putc(c);	/* ... and echo it		*/

		switch (c) {
		case '\r':
		case '\n':
			*p = '\0';
			return (p - buf);
		case '\0':
		case 0x03:			/* ^C - Control C		*/
			return (-1);
		default:
			*p = c;
		}

	    /* Check for the console hangup (if any different from serial) */
	    if (gd->jt->getc != getc) {
		if (ctrlc()) {
		    return (-1);
		}
	    }
	}

	/* line too long - truncate */
	*p = '\0';
	return (p - buf);
}

#if defined(CONFIG_CMD_SAVES)

int do_save_serial (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	ulong offset = 0;
	ulong size   = 0;
#ifdef	CONFIG_SYS_LOADS_BAUD_CHANGE
	int save_baudrate, current_baudrate;

	save_baudrate = current_baudrate = gd->baudrate;
#endif

	if (argc >= 2) {
		offset = simple_strtoul(argv[1], NULL, 16);
	}
#ifdef	CONFIG_SYS_LOADS_BAUD_CHANGE
	if (argc >= 3) {
		size = simple_strtoul(argv[2], NULL, 16);
	}
	if (argc == 4) {
		save_baudrate = (int)simple_strtoul(argv[3], NULL, 10);

		/* default to current baudrate */
		if (save_baudrate == 0)
			save_baudrate = current_baudrate;
	}
	if (save_baudrate != current_baudrate) {
		printf("## Switch baudrate to %d bps and press ENTER ...\n",
			save_baudrate);
		udelay(50000);
		gd->baudrate = save_baudrate;
		serial_setbrg();
		udelay(50000);
		for (;;) {
			if (getc() == '\r')
				break;
		}
	}
#else	/* ! CONFIG_SYS_LOADS_BAUD_CHANGE */
	if (argc == 3) {
		size = simple_strtoul(argv[2], NULL, 16);
	}
#endif	/* CONFIG_SYS_LOADS_BAUD_CHANGE */

	printf("## Ready for S-Record upload, press ENTER to proceed ...\n");
	for (;;) {
		if (getc() == '\r')
			break;
	}
	if (save_serial(offset, size)) {
		printf("## S-Record upload aborted\n");
	} else {
		printf("## S-Record upload complete\n");
	}
#ifdef	CONFIG_SYS_LOADS_BAUD_CHANGE
	if (save_baudrate != current_baudrate) {
		printf("## Switch baudrate to %d bps and press ESC ...\n",
			(int)current_baudrate);
		udelay(50000);
		gd->baudrate = current_baudrate;
		serial_setbrg();
		udelay(50000);
		for (;;) {
			if (getc() == 0x1B) /* ESC */
				break;
		}
	}
#endif
	return 0;
}

#define SREC3_START				"S0030000FC\n"
#define SREC3_FORMAT			"S3%02X%08lX%s%02X\n"
#define SREC3_END				"S70500000000FA\n"
#define SREC_BYTES_PER_RECORD	16

static int save_serial(ulong address, ulong count)
{
	int i, c, reclen, checksum, length;
	char *hex = "0123456789ABCDEF";
	char	record[2*SREC_BYTES_PER_RECORD+16];	/* buffer for one S-Record	*/
	char	data[2*SREC_BYTES_PER_RECORD+1];	/* buffer for hex data	*/

	reclen = 0;
	checksum  = 0;

	if(write_record(SREC3_START))			/* write the header */
		return (-1);
	do {
		if(count) {						/* collect hex data in the buffer  */
			c = *(volatile uchar*)(address + reclen);	/* get one byte    */
			checksum += c;							/* accumulate checksum */
			data[2*reclen]   = hex[(c>>4)&0x0f];
			data[2*reclen+1] = hex[c & 0x0f];
			data[2*reclen+2] = '\0';
			++reclen;
			--count;
		}
		if(reclen == SREC_BYTES_PER_RECORD || count == 0) {
			/* enough data collected for one record: dump it */
			if(reclen) {	/* build & write a data record: */
				/* address + data + checksum */
				length = 4 + reclen + 1;

				/* accumulate length bytes into checksum */
				for(i = 0; i < 2; i++)
					checksum += (length >> (8*i)) & 0xff;

				/* accumulate address bytes into checksum: */
				for(i = 0; i < 4; i++)
					checksum += (address >> (8*i)) & 0xff;

				/* make proper checksum byte: */
				checksum = ~checksum & 0xff;

				/* output one record: */
				sprintf(record, SREC3_FORMAT, length, address, data, checksum);
				if(write_record(record))
					return (-1);
			}
			address  += reclen;  /* increment address */
			checksum  = 0;
			reclen    = 0;
		}
	}
	while(count);
	if(write_record(SREC3_END))	/* write the final record */
		return (-1);
	return(0);
}

static int write_record(char *buf)
{
	char c;

	while((c = *buf++))
		putc(c);

	/* Check for the console hangup (if any different from serial) */

	if (ctrlc()) {
	    return (-1);
	}
	return (0);
}
# endif

#endif


#if defined(CONFIG_CMD_LOADB)
/*
 * loadb command (load binary) included
 */
#define XON_CHAR        17
#define XOFF_CHAR       19
#define START_CHAR      0x01
#define ETX_CHAR	0x03
#define END_CHAR        0x0D
#define SPACE           0x20
#define K_ESCAPE        0x23
#define SEND_TYPE       'S'
#define DATA_TYPE       'D'
#define ACK_TYPE        'Y'
#define NACK_TYPE       'N'
#define BREAK_TYPE      'B'
#define tochar(x) ((char) (((x) + SPACE) & 0xff))
#define untochar(x) ((int) (((x) - SPACE) & 0xff))

static void set_kerm_bin_mode(unsigned long *);
static int k_recv(void);
static ulong load_serial_bin(ulong offset);


static char his_eol;        /* character he needs at end of packet */
static int  his_pad_count;  /* number of pad chars he needs */
static char his_pad_char;   /* pad chars he needs */
static char his_quote;      /* quote chars he'll use */

static int do_load_serial_bin(cmd_tbl_t *cmdtp, int flag, int argc,
			      char * const argv[])
{
	ulong offset = 0;
	ulong addr;
	int load_baudrate, current_baudrate;
	int rcode = 0;
	char *s;

	/* pre-set offset from CONFIG_SYS_LOAD_ADDR */
	offset = CONFIG_SYS_LOAD_ADDR;

	/* pre-set offset from $loadaddr */
	if ((s = getenv("loadaddr")) != NULL) {
		offset = simple_strtoul(s, NULL, 16);
	}

	load_baudrate = current_baudrate = gd->baudrate;

	if (argc >= 2) {
		offset = simple_strtoul(argv[1], NULL, 16);
	}
	if (argc == 3) {
		load_baudrate = (int)simple_strtoul(argv[2], NULL, 10);

		/* default to current baudrate */
		if (load_baudrate == 0)
			load_baudrate = current_baudrate;
	}

	if (load_baudrate != current_baudrate) {
		printf("## Switch baudrate to %d bps and press ENTER ...\n",
			load_baudrate);
		udelay(50000);
		gd->baudrate = load_baudrate;
		serial_setbrg();
		udelay(50000);
		for (;;) {
			if (getc() == '\r')
				break;
		}
	}

	if (strcmp(argv[0],"loady")==0) {
		printf("## Ready for binary (ymodem) download "
			"to 0x%08lX at %d bps...\n",
			offset,
			load_baudrate);

		addr = load_serial_ymodem(offset, xyzModem_ymodem);

	} else if (strcmp(argv[0],"loadx")==0) {
		printf("## Ready for binary (xmodem) download "
			"to 0x%08lX at %d bps...\n",
			offset,
			load_baudrate);

		addr = load_serial_ymodem(offset, xyzModem_xmodem);

	} else {

		printf("## Ready for binary (kermit) download "
			"to 0x%08lX at %d bps...\n",
			offset,
			load_baudrate);
		addr = load_serial_bin(offset);

		if (addr == ~0) {
			load_addr = 0;
			printf("## Binary (kermit) download aborted\n");
			rcode = 1;
		} else {
			printf("## Start Addr      = 0x%08lX\n", addr);
			load_addr = addr;
		}
	}
	if (load_baudrate != current_baudrate) {
		printf("## Switch baudrate to %d bps and press ESC ...\n",
			current_baudrate);
		udelay(50000);
		gd->baudrate = current_baudrate;
		serial_setbrg();
		udelay(50000);
		for (;;) {
			if (getc() == 0x1B) /* ESC */
				break;
		}
	}

	return rcode;
}


static ulong load_serial_bin(ulong offset)
{
	int size, i;

	set_kerm_bin_mode((ulong *) offset);
	size = k_recv();

	/*
	 * Gather any trailing characters (for instance, the ^D which
	 * is sent by 'cu' after sending a file), and give the
	 * box some time (100 * 1 ms)
	 */
	for (i=0; i<100; ++i) {
		if (tstc()) {
			(void) getc();
		}
		udelay(1000);
	}

	flush_cache(offset, size);

	printf("## Total Size      = 0x%08x = %d Bytes\n", size, size);
	setenv_hex("filesize", size);

	return offset;
}

static void send_pad(void)
{
	int count = his_pad_count;

	while (count-- > 0)
		putc(his_pad_char);
}

/* converts escaped kermit char to binary char */
static char ktrans(char in)
{
	if ((in & 0x60) == 0x40) {
		return (char) (in & ~0x40);
	} else if ((in & 0x7f) == 0x3f) {
		return (char) (in | 0x40);
	} else
		return in;
}

static int chk1(char *buffer)
{
	int total = 0;

	while (*buffer) {
		total += *buffer++;
	}
	return (int) ((total + ((total >> 6) & 0x03)) & 0x3f);
}

static void s1_sendpacket(char *packet)
{
	send_pad();
	while (*packet) {
		putc(*packet++);
	}
}

static char a_b[24];
static void send_ack(int n)
{
	a_b[0] = START_CHAR;
	a_b[1] = tochar(3);
	a_b[2] = tochar(n);
	a_b[3] = ACK_TYPE;
	a_b[4] = '\0';
	a_b[4] = tochar(chk1(&a_b[1]));
	a_b[5] = his_eol;
	a_b[6] = '\0';
	s1_sendpacket(a_b);
}

static void send_nack(int n)
{
	a_b[0] = START_CHAR;
	a_b[1] = tochar(3);
	a_b[2] = tochar(n);
	a_b[3] = NACK_TYPE;
	a_b[4] = '\0';
	a_b[4] = tochar(chk1(&a_b[1]));
	a_b[5] = his_eol;
	a_b[6] = '\0';
	s1_sendpacket(a_b);
}


static void (*os_data_init)(void);
static void (*os_data_char)(char new_char);
static int os_data_state, os_data_state_saved;
static char *os_data_addr, *os_data_addr_saved;
static char *bin_start_address;

static void bin_data_init(void)
{
	os_data_state = 0;
	os_data_addr = bin_start_address;
}

static void os_data_save(void)
{
	os_data_state_saved = os_data_state;
	os_data_addr_saved = os_data_addr;
}

static void os_data_restore(void)
{
	os_data_state = os_data_state_saved;
	os_data_addr = os_data_addr_saved;
}

static void bin_data_char(char new_char)
{
	switch (os_data_state) {
	case 0:					/* data */
		*os_data_addr++ = new_char;
		break;
	}
}

static void set_kerm_bin_mode(unsigned long *addr)
{
	bin_start_address = (char *) addr;
	os_data_init = bin_data_init;
	os_data_char = bin_data_char;
}


/* k_data_* simply handles the kermit escape translations */
static int k_data_escape, k_data_escape_saved;
static void k_data_init(void)
{
	k_data_escape = 0;
	os_data_init();
}

static void k_data_save(void)
{
	k_data_escape_saved = k_data_escape;
	os_data_save();
}

static void k_data_restore(void)
{
	k_data_escape = k_data_escape_saved;
	os_data_restore();
}

static void k_data_char(char new_char)
{
	if (k_data_escape) {
		/* last char was escape - translate this character */
		os_data_char(ktrans(new_char));
		k_data_escape = 0;
	} else {
		if (new_char == his_quote) {
			/* this char is escape - remember */
			k_data_escape = 1;
		} else {
			/* otherwise send this char as-is */
			os_data_char(new_char);
		}
	}
}

#define SEND_DATA_SIZE  20
static char send_parms[SEND_DATA_SIZE];
static char *send_ptr;

/* handle_send_packet interprits the protocol info and builds and
   sends an appropriate ack for what we can do */
static void handle_send_packet(int n)
{
	int length = 3;
	int bytes;

	/* initialize some protocol parameters */
	his_eol = END_CHAR;		/* default end of line character */
	his_pad_count = 0;
	his_pad_char = '\0';
	his_quote = K_ESCAPE;

	/* ignore last character if it filled the buffer */
	if (send_ptr == &send_parms[SEND_DATA_SIZE - 1])
		--send_ptr;
	bytes = send_ptr - send_parms;	/* how many bytes we'll process */
	do {
		if (bytes-- <= 0)
			break;
		/* handle MAXL - max length */
		/* ignore what he says - most I'll take (here) is 94 */
		a_b[++length] = tochar(94);
		if (bytes-- <= 0)
			break;
		/* handle TIME - time you should wait for my packets */
		/* ignore what he says - don't wait for my ack longer than 1 second */
		a_b[++length] = tochar(1);
		if (bytes-- <= 0)
			break;
		/* handle NPAD - number of pad chars I need */
		/* remember what he says - I need none */
		his_pad_count = untochar(send_parms[2]);
		a_b[++length] = tochar(0);
		if (bytes-- <= 0)
			break;
		/* handle PADC - pad chars I need */
		/* remember what he says - I need none */
		his_pad_char = ktrans(send_parms[3]);
		a_b[++length] = 0x40;	/* He should ignore this */
		if (bytes-- <= 0)
			break;
		/* handle EOL - end of line he needs */
		/* remember what he says - I need CR */
		his_eol = untochar(send_parms[4]);
		a_b[++length] = tochar(END_CHAR);
		if (bytes-- <= 0)
			break;
		/* handle QCTL - quote control char he'll use */
		/* remember what he says - I'll use '#' */
		his_quote = send_parms[5];
		a_b[++length] = '#';
		if (bytes-- <= 0)
			break;
		/* handle QBIN - 8-th bit prefixing */
		/* ignore what he says - I refuse */
		a_b[++length] = 'N';
		if (bytes-- <= 0)
			break;
		/* handle CHKT - the clock check type */
		/* ignore what he says - I do type 1 (for now) */
		a_b[++length] = '1';
		if (bytes-- <= 0)
			break;
		/* handle REPT - the repeat prefix */
		/* ignore what he says - I refuse (for now) */
		a_b[++length] = 'N';
		if (bytes-- <= 0)
			break;
		/* handle CAPAS - the capabilities mask */
		/* ignore what he says - I only do long packets - I don't do windows */
		a_b[++length] = tochar(2);	/* only long packets */
		a_b[++length] = tochar(0);	/* no windows */
		a_b[++length] = tochar(94);	/* large packet msb */
		a_b[++length] = tochar(94);	/* large packet lsb */
	} while (0);

	a_b[0] = START_CHAR;
	a_b[1] = tochar(length);
	a_b[2] = tochar(n);
	a_b[3] = ACK_TYPE;
	a_b[++length] = '\0';
	a_b[length] = tochar(chk1(&a_b[1]));
	a_b[++length] = his_eol;
	a_b[++length] = '\0';
	s1_sendpacket(a_b);
}

/* k_recv receives a OS Open image file over kermit line */
static int k_recv(void)
{
	char new_char;
	char k_state, k_state_saved;
	int sum;
	int done;
	int length;
	int n, last_n;
	int len_lo, len_hi;

	/* initialize some protocol parameters */
	his_eol = END_CHAR;		/* default end of line character */
	his_pad_count = 0;
	his_pad_char = '\0';
	his_quote = K_ESCAPE;

	/* initialize the k_recv and k_data state machine */
	done = 0;
	k_state = 0;
	k_data_init();
	k_state_saved = k_state;
	k_data_save();
	n = 0;				/* just to get rid of a warning */
	last_n = -1;

	/* expect this "type" sequence (but don't check):
	   S: send initiate
	   F: file header
	   D: data (multiple)
	   Z: end of file
	   B: break transmission
	 */

	/* enter main loop */
	while (!done) {
		/* set the send packet pointer to begining of send packet parms */
		send_ptr = send_parms;

		/* With each packet, start summing the bytes starting with the length.
		   Save the current sequence number.
		   Note the type of the packet.
		   If a character less than SPACE (0x20) is received - error.
		 */

#if 0
		/* OLD CODE, Prior to checking sequence numbers */
		/* first have all state machines save current states */
		k_state_saved = k_state;
		k_data_save ();
#endif

		/* get a packet */
		/* wait for the starting character or ^C */
		for (;;) {
			switch (getc ()) {
			case START_CHAR:	/* start packet */
				goto START;
			case ETX_CHAR:		/* ^C waiting for packet */
				return (0);
			default:
				;
			}
		}
START:
		/* get length of packet */
		sum = 0;
		new_char = getc();
		if ((new_char & 0xE0) == 0)
			goto packet_error;
		sum += new_char & 0xff;
		length = untochar(new_char);
		/* get sequence number */
		new_char = getc();
		if ((new_char & 0xE0) == 0)
			goto packet_error;
		sum += new_char & 0xff;
		n = untochar(new_char);
		--length;

		/* NEW CODE - check sequence numbers for retried packets */
		/* Note - this new code assumes that the sequence number is correctly
		 * received.  Handling an invalid sequence number adds another layer
		 * of complexity that may not be needed - yet!  At this time, I'm hoping
		 * that I don't need to buffer the incoming data packets and can write
		 * the data into memory in real time.
		 */
		if (n == last_n) {
			/* same sequence number, restore the previous state */
			k_state = k_state_saved;
			k_data_restore();
		} else {
			/* new sequence number, checkpoint the download */
			last_n = n;
			k_state_saved = k_state;
			k_data_save();
		}
		/* END NEW CODE */

		/* get packet type */
		new_char = getc();
		if ((new_char & 0xE0) == 0)
			goto packet_error;
		sum += new_char & 0xff;
		k_state = new_char;
		--length;
		/* check for extended length */
		if (length == -2) {
			/* (length byte was 0, decremented twice) */
			/* get the two length bytes */
			new_char = getc();
			if ((new_char & 0xE0) == 0)
				goto packet_error;
			sum += new_char & 0xff;
			len_hi = untochar(new_char);
			new_char = getc();
			if ((new_char & 0xE0) == 0)
				goto packet_error;
			sum += new_char & 0xff;
			len_lo = untochar(new_char);
			length = len_hi * 95 + len_lo;
			/* check header checksum */
			new_char = getc();
			if ((new_char & 0xE0) == 0)
				goto packet_error;
			if (new_char != tochar((sum + ((sum >> 6) & 0x03)) & 0x3f))
				goto packet_error;
			sum += new_char & 0xff;
/* --length; */ /* new length includes only data and block check to come */
		}
		/* bring in rest of packet */
		while (length > 1) {
			new_char = getc();
			if ((new_char & 0xE0) == 0)
				goto packet_error;
			sum += new_char & 0xff;
			--length;
			if (k_state == DATA_TYPE) {
				/* pass on the data if this is a data packet */
				k_data_char (new_char);
			} else if (k_state == SEND_TYPE) {
				/* save send pack in buffer as is */
				*send_ptr++ = new_char;
				/* if too much data, back off the pointer */
				if (send_ptr >= &send_parms[SEND_DATA_SIZE])
					--send_ptr;
			}
		}
		/* get and validate checksum character */
		new_char = getc();
		if ((new_char & 0xE0) == 0)
			goto packet_error;
		if (new_char != tochar((sum + ((sum >> 6) & 0x03)) & 0x3f))
			goto packet_error;
		/* get END_CHAR */
		new_char = getc();
		if (new_char != END_CHAR) {
		  packet_error:
			/* restore state machines */
			k_state = k_state_saved;
			k_data_restore();
			/* send a negative acknowledge packet in */
			send_nack(n);
		} else if (k_state == SEND_TYPE) {
			/* crack the protocol parms, build an appropriate ack packet */
			handle_send_packet(n);
		} else {
			/* send simple acknowledge packet in */
			send_ack(n);
			/* quit if end of transmission */
			if (k_state == BREAK_TYPE)
				done = 1;
		}
	}
	return ((ulong) os_data_addr - (ulong) bin_start_address);
}

static int getcxmodem(void) {
	if (tstc())
		return (getc());
	return -1;
}
static ulong load_serial_ymodem(ulong offset, int mode)
{
	int size;
	int err;
	int res;
	connection_info_t info;
	char ymodemBuf[1024];
	ulong store_addr = ~0;
	ulong addr = 0;

	size = 0;
	info.mode = mode;
	res = xyzModem_stream_open(&info, &err);
	if (!res) {

		while ((res =
			xyzModem_stream_read(ymodemBuf, 1024, &err)) > 0) {
			store_addr = addr + offset;
			size += res;
			addr += res;
#ifndef CONFIG_SYS_NO_FLASH
			if (addr2info(store_addr)) {
				int rc;

				rc = flash_write((char *) ymodemBuf,
						  store_addr, res);
				if (rc != 0) {
					flash_perror (rc);
					return (~0);
				}
			} else
#endif
			{
				memcpy((char *)(store_addr), ymodemBuf,
					res);
			}

		}
	} else {
		printf("%s\n", xyzModem_error(err));
	}

	xyzModem_stream_close(&err);
	xyzModem_stream_terminate(false, &getcxmodem);


	flush_cache(offset, size);

	printf("## Total Size      = 0x%08x = %d Bytes\n", size, size);
	setenv_hex("filesize", size);

	return offset;
}

#endif

/* -------------------------------------------------------------------- */

#if defined(CONFIG_CMD_LOADS)

#ifdef	CONFIG_SYS_LOADS_BAUD_CHANGE
U_BOOT_CMD(
	loads, 3, 0,	do_load_serial,
	"load S-Record file over serial line",
	"[ off ] [ baud ]\n"
	"    - load S-Record file over serial line"
	" with offset 'off' and baudrate 'baud'"
);

#else	/* ! CONFIG_SYS_LOADS_BAUD_CHANGE */
U_BOOT_CMD(
	loads, 2, 0,	do_load_serial,
	"load S-Record file over serial line",
	"[ off ]\n"
	"    - load S-Record file over serial line with offset 'off'"
);
#endif	/* CONFIG_SYS_LOADS_BAUD_CHANGE */

/*
 * SAVES always requires LOADS support, but not vice versa
 */


#if defined(CONFIG_CMD_SAVES)
#ifdef	CONFIG_SYS_LOADS_BAUD_CHANGE
U_BOOT_CMD(
	saves, 4, 0,	do_save_serial,
	"save S-Record file over serial line",
	"[ off ] [size] [ baud ]\n"
	"    - save S-Record file over serial line"
	" with offset 'off', size 'size' and baudrate 'baud'"
);
#else	/* ! CONFIG_SYS_LOADS_BAUD_CHANGE */
U_BOOT_CMD(
	saves, 3, 0,	do_save_serial,
	"save S-Record file over serial line",
	"[ off ] [size]\n"
	"    - save S-Record file over serial line with offset 'off' and size 'size'"
);
#endif	/* CONFIG_SYS_LOADS_BAUD_CHANGE */
#endif	/* CONFIG_CMD_SAVES */
#endif	/* CONFIG_CMD_LOADS */


#if defined(CONFIG_CMD_LOADB)
U_BOOT_CMD(
	loadb, 3, 0,	do_load_serial_bin,
	"load binary file over serial line (kermit mode)",
	"[ off ] [ baud ]\n"
	"    - load binary file over serial line"
	" with offset 'off' and baudrate 'baud'"
);

U_BOOT_CMD(
	loadx, 3, 0,	do_load_serial_bin,
	"load binary file over serial line (xmodem mode)",
	"[ off ] [ baud ]\n"
	"    - load binary file over serial line"
	" with offset 'off' and baudrate 'baud'"
);

U_BOOT_CMD(
	loady, 3, 0,	do_load_serial_bin,
	"load binary file over serial line (ymodem mode)",
	"[ off ] [ baud ]\n"
	"    - load binary file over serial line"
	" with offset 'off' and baudrate 'baud'"
);

#endif	/* CONFIG_CMD_LOADB */

/* -------------------------------------------------------------------- */

#if defined(CONFIG_CMD_HWFLOW)
int do_hwflow(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	extern int hwflow_onoff(int);

	if (argc == 2) {
		if (strcmp(argv[1], "off") == 0)
			hwflow_onoff(-1);
		else
			if (strcmp(argv[1], "on") == 0)
				hwflow_onoff(1);
			else
				return CMD_RET_USAGE;
	}
	printf("RTS/CTS hardware flow control: %s\n", hwflow_onoff(0) ? "on" : "off");
	return 0;
}

/* -------------------------------------------------------------------- */

U_BOOT_CMD(
	hwflow, 2, 0,	do_hwflow,
	"turn RTS/CTS hardware flow control in serial line on/off",
	"[on|off]"
);

#endif	/* CONFIG_CMD_HWFLOW */