2 * (C) Copyright 2000-2004
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
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.
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.
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,
25 * Serial up- and download support
34 #if (CONFIG_COMMANDS & CFG_CMD_LOADS)
35 static ulong load_serial (ulong offset);
36 static ulong load_serial_ymodem (ulong offset);
37 static int read_record (char *buf, ulong len);
38 # if (CONFIG_COMMANDS & CFG_CMD_SAVES)
39 static int save_serial (ulong offset, ulong size);
40 static int write_record (char *buf);
41 # endif /* CFG_CMD_SAVES */
43 static int do_echo = 1;
44 #endif /* CFG_CMD_LOADS */
46 /* -------------------------------------------------------------------- */
48 #if (CONFIG_COMMANDS & CFG_CMD_LOADS)
49 int do_load_serial (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
56 #ifdef CFG_LOADS_BAUD_CHANGE
57 DECLARE_GLOBAL_DATA_PTR;
58 int load_baudrate, current_baudrate;
60 load_baudrate = current_baudrate = gd->baudrate;
63 if (((env_echo = getenv("loads_echo")) != NULL) && (*env_echo == '1')) {
69 #ifdef CFG_LOADS_BAUD_CHANGE
71 offset = simple_strtoul(argv[1], NULL, 16);
74 load_baudrate = (int)simple_strtoul(argv[2], NULL, 10);
76 /* default to current baudrate */
77 if (load_baudrate == 0)
78 load_baudrate = current_baudrate;
80 if (load_baudrate != current_baudrate) {
81 printf ("## Switch baudrate to %d bps and press ENTER ...\n",
84 gd->baudrate = load_baudrate;
92 #else /* ! CFG_LOADS_BAUD_CHANGE */
94 offset = simple_strtoul(argv[1], NULL, 16);
96 #endif /* CFG_LOADS_BAUD_CHANGE */
98 printf ("## Ready for S-Record download ...\n");
100 addr = load_serial (offset);
103 * Gather any trailing characters (for instance, the ^D which
104 * is sent by 'cu' after sending a file), and give the
105 * box some time (100 * 1 ms)
107 for (i=0; i<100; ++i) {
115 printf ("## S-Record download aborted\n");
118 printf ("## Start Addr = 0x%08lX\n", addr);
122 #ifdef CFG_LOADS_BAUD_CHANGE
123 if (load_baudrate != current_baudrate) {
124 printf ("## Switch baudrate to %d bps and press ESC ...\n",
127 gd->baudrate = current_baudrate;
131 if (getc() == 0x1B) /* ESC */
140 load_serial (ulong offset)
142 char record[SREC_MAXRECLEN + 1]; /* buffer for one S-Record */
143 char binbuf[SREC_MAXBINLEN]; /* buffer for binary data */
144 int binlen; /* no. of data bytes in S-Rec. */
145 int type; /* return code for record type */
146 ulong addr; /* load address from S-Record */
147 ulong size; /* number of bytes transferred */
150 ulong start_addr = ~0;
154 while (read_record(record, SREC_MAXRECLEN + 1) >= 0) {
155 type = srec_decode (record, &binlen, &addr, binbuf);
158 return (~0); /* Invalid S-Record */
165 store_addr = addr + offset;
167 if (addr2info(store_addr)) {
170 rc = flash_write((char *)binbuf,store_addr,binlen);
178 memcpy ((char *)(store_addr), binbuf, binlen);
180 if ((store_addr) < start_addr)
181 start_addr = store_addr;
182 if ((store_addr + binlen - 1) > end_addr)
183 end_addr = store_addr + binlen - 1;
189 size = end_addr - start_addr + 1;
191 "## First Load Addr = 0x%08lX\n"
192 "## Last Load Addr = 0x%08lX\n"
193 "## Total Size = 0x%08lX = %ld Bytes\n",
194 start_addr, end_addr, size, size
196 flush_cache (start_addr, size);
197 sprintf(buf, "%lX", size);
198 setenv("filesize", buf);
205 if (!do_echo) { /* print a '.' every 100 lines */
206 if ((++line_count % 100) == 0)
211 return (~0); /* Download aborted */
215 read_record (char *buf, ulong len)
217 DECLARE_GLOBAL_DATA_PTR;
221 --len; /* always leave room for terminating '\0' byte */
223 for (p=buf; p < buf+len; ++p) {
224 c = getc(); /* read character */
226 putc (c); /* ... and echo it */
234 case 0x03: /* ^C - Control C */
240 /* Check for the console hangup (if any different from serial) */
241 if (gd->jt[XF_getc] != getc) {
248 /* line too long - truncate */
253 #if (CONFIG_COMMANDS & CFG_CMD_SAVES)
255 int do_save_serial (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
259 #ifdef CFG_LOADS_BAUD_CHANGE
260 DECLARE_GLOBAL_DATA_PTR;
261 int save_baudrate, current_baudrate;
263 save_baudrate = current_baudrate = gd->baudrate;
267 offset = simple_strtoul(argv[1], NULL, 16);
269 #ifdef CFG_LOADS_BAUD_CHANGE
271 size = simple_strtoul(argv[2], NULL, 16);
274 save_baudrate = (int)simple_strtoul(argv[3], NULL, 10);
276 /* default to current baudrate */
277 if (save_baudrate == 0)
278 save_baudrate = current_baudrate;
280 if (save_baudrate != current_baudrate) {
281 printf ("## Switch baudrate to %d bps and press ENTER ...\n",
284 gd->baudrate = save_baudrate;
292 #else /* ! CFG_LOADS_BAUD_CHANGE */
294 size = simple_strtoul(argv[2], NULL, 16);
296 #endif /* CFG_LOADS_BAUD_CHANGE */
298 printf ("## Ready for S-Record upload, press ENTER to proceed ...\n");
303 if(save_serial (offset, size)) {
304 printf ("## S-Record upload aborted\n");
306 printf ("## S-Record upload complete\n");
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);
313 gd->baudrate = current_baudrate;
317 if (getc() == 0x1B) /* ESC */
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
330 static int save_serial (ulong address, ulong count)
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 */
340 if(write_record(SREC3_START)) /* write the header */
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';
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;
358 /* accumulate length bytes into checksum */
359 for(i = 0; i < 2; i++)
360 checksum += (length >> (8*i)) & 0xff;
362 /* accumulate address bytes into checksum: */
363 for(i = 0; i < 4; i++)
364 checksum += (address >> (8*i)) & 0xff;
366 /* make proper checksum byte: */
367 checksum = ~checksum & 0xff;
369 /* output one record: */
370 sprintf(record, SREC3_FORMAT, length, address, data, checksum);
371 if(write_record(record))
374 address += reclen; /* increment address */
380 if(write_record(SREC3_END)) /* write the final record */
386 write_record (char *buf)
393 /* Check for the console hangup (if any different from serial) */
400 # endif /* CFG_CMD_SAVES */
402 #endif /* CFG_CMD_LOADS */
405 #if (CONFIG_COMMANDS & CFG_CMD_LOADB) /* loadb command (load binary) included */
409 #define START_CHAR 0x01
410 #define ETX_CHAR 0x03
411 #define END_CHAR 0x0D
413 #define K_ESCAPE 0x23
414 #define SEND_TYPE 'S'
415 #define DATA_TYPE 'D'
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))
422 extern int os_data_count;
423 extern int os_data_header[8];
425 static void set_kerm_bin_mode(unsigned long *);
426 static int k_recv(void);
427 static ulong load_serial_bin (ulong offset);
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 */
435 int do_load_serial_bin (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
437 DECLARE_GLOBAL_DATA_PTR;
441 int load_baudrate, current_baudrate;
445 /* pre-set offset from CFG_LOAD_ADDR */
446 offset = CFG_LOAD_ADDR;
448 /* pre-set offset from $loadaddr */
449 if ((s = getenv("loadaddr")) != NULL) {
450 offset = simple_strtoul(s, NULL, 16);
453 load_baudrate = current_baudrate = gd->baudrate;
456 offset = simple_strtoul(argv[1], NULL, 16);
459 load_baudrate = (int)simple_strtoul(argv[2], NULL, 10);
461 /* default to current baudrate */
462 if (load_baudrate == 0)
463 load_baudrate = current_baudrate;
466 if (load_baudrate != current_baudrate) {
467 printf ("## Switch baudrate to %d bps and press ENTER ...\n",
470 gd->baudrate = load_baudrate;
479 if (strcmp(argv[0],"loady")==0) {
480 printf ("## Ready for binary (ymodem) download "
481 "to 0x%08lX at %d bps...\n",
485 addr = load_serial_ymodem (offset);
489 printf ("## Ready for binary (kermit) download "
490 "to 0x%08lX at %d bps...\n",
493 addr = load_serial_bin (offset);
497 printf ("## Binary (kermit) download aborted\n");
500 printf ("## Start Addr = 0x%08lX\n", addr);
504 if (load_baudrate != current_baudrate) {
505 printf ("## Switch baudrate to %d bps and press ESC ...\n",
508 gd->baudrate = current_baudrate;
512 if (getc() == 0x1B) /* ESC */
517 #ifdef CONFIG_AUTOSCRIPT
521 if (((s = getenv("autoscript")) != NULL) && (strcmp(s,"yes") == 0)) {
522 printf("Running autoscript at addr 0x%08lX ...\n", load_addr);
523 rcode = autoscript (load_addr);
531 static ulong load_serial_bin (ulong offset)
536 set_kerm_bin_mode ((ulong *) offset);
540 * Gather any trailing characters (for instance, the ^D which
541 * is sent by 'cu' after sending a file), and give the
542 * box some time (100 * 1 ms)
544 for (i=0; i<100; ++i) {
551 flush_cache (offset, size);
553 printf("## Total Size = 0x%08x = %d Bytes\n", size, size);
554 sprintf(buf, "%X", size);
555 setenv("filesize", buf);
562 int count = his_pad_count;
568 /* converts escaped kermit char to binary char */
569 char ktrans (char in)
571 if ((in & 0x60) == 0x40) {
572 return (char) (in & ~0x40);
573 } else if ((in & 0x7f) == 0x3f) {
574 return (char) (in | 0x40);
579 int chk1 (char *buffer)
586 return (int) ((total + ((total >> 6) & 0x03)) & 0x3f);
589 void s1_sendpacket (char *packet)
598 void send_ack (int n)
605 a_b[4] = tochar (chk1 (&a_b[1]));
611 void send_nack (int n)
618 a_b[4] = tochar (chk1 (&a_b[1]));
625 /* os_data_* takes an OS Open image and puts it into memory, and
626 puts the boot header in an array named os_data_header
628 if image is binary, no header is stored in os_data_header.
630 void (*os_data_init) (void);
631 void (*os_data_char) (char new_char);
632 static int os_data_state, os_data_state_saved;
634 static int os_data_count_saved;
635 static char *os_data_addr, *os_data_addr_saved;
636 static char *bin_start_address;
637 int os_data_header[8];
638 static void bin_data_init (void)
642 os_data_addr = bin_start_address;
644 static void os_data_save (void)
646 os_data_state_saved = os_data_state;
647 os_data_count_saved = os_data_count;
648 os_data_addr_saved = os_data_addr;
650 static void os_data_restore (void)
652 os_data_state = os_data_state_saved;
653 os_data_count = os_data_count_saved;
654 os_data_addr = os_data_addr_saved;
656 static void bin_data_char (char new_char)
658 switch (os_data_state) {
660 *os_data_addr++ = new_char;
665 static void set_kerm_bin_mode (unsigned long *addr)
667 bin_start_address = (char *) addr;
668 os_data_init = bin_data_init;
669 os_data_char = bin_data_char;
673 /* k_data_* simply handles the kermit escape translations */
674 static int k_data_escape, k_data_escape_saved;
675 void k_data_init (void)
680 void k_data_save (void)
682 k_data_escape_saved = k_data_escape;
685 void k_data_restore (void)
687 k_data_escape = k_data_escape_saved;
690 void k_data_char (char new_char)
693 /* last char was escape - translate this character */
694 os_data_char (ktrans (new_char));
697 if (new_char == his_quote) {
698 /* this char is escape - remember */
701 /* otherwise send this char as-is */
702 os_data_char (new_char);
707 #define SEND_DATA_SIZE 20
708 char send_parms[SEND_DATA_SIZE];
711 /* handle_send_packet interprits the protocol info and builds and
712 sends an appropriate ack for what we can do */
713 void handle_send_packet (int n)
718 /* initialize some protocol parameters */
719 his_eol = END_CHAR; /* default end of line character */
722 his_quote = K_ESCAPE;
724 /* ignore last character if it filled the buffer */
725 if (send_ptr == &send_parms[SEND_DATA_SIZE - 1])
727 bytes = send_ptr - send_parms; /* how many bytes we'll process */
731 /* handle MAXL - max length */
732 /* ignore what he says - most I'll take (here) is 94 */
733 a_b[++length] = tochar (94);
736 /* handle TIME - time you should wait for my packets */
737 /* ignore what he says - don't wait for my ack longer than 1 second */
738 a_b[++length] = tochar (1);
741 /* handle NPAD - number of pad chars I need */
742 /* remember what he says - I need none */
743 his_pad_count = untochar (send_parms[2]);
744 a_b[++length] = tochar (0);
747 /* handle PADC - pad chars I need */
748 /* remember what he says - I need none */
749 his_pad_char = ktrans (send_parms[3]);
750 a_b[++length] = 0x40; /* He should ignore this */
753 /* handle EOL - end of line he needs */
754 /* remember what he says - I need CR */
755 his_eol = untochar (send_parms[4]);
756 a_b[++length] = tochar (END_CHAR);
759 /* handle QCTL - quote control char he'll use */
760 /* remember what he says - I'll use '#' */
761 his_quote = send_parms[5];
765 /* handle QBIN - 8-th bit prefixing */
766 /* ignore what he says - I refuse */
770 /* handle CHKT - the clock check type */
771 /* ignore what he says - I do type 1 (for now) */
775 /* handle REPT - the repeat prefix */
776 /* ignore what he says - I refuse (for now) */
780 /* handle CAPAS - the capabilities mask */
781 /* ignore what he says - I only do long packets - I don't do windows */
782 a_b[++length] = tochar (2); /* only long packets */
783 a_b[++length] = tochar (0); /* no windows */
784 a_b[++length] = tochar (94); /* large packet msb */
785 a_b[++length] = tochar (94); /* large packet lsb */
789 a_b[1] = tochar (length);
792 a_b[++length] = '\0';
793 a_b[length] = tochar (chk1 (&a_b[1]));
794 a_b[++length] = his_eol;
795 a_b[++length] = '\0';
799 /* k_recv receives a OS Open image file over kermit line */
800 static int k_recv (void)
803 char k_state, k_state_saved;
811 /* initialize some protocol parameters */
812 his_eol = END_CHAR; /* default end of line character */
815 his_quote = K_ESCAPE;
817 /* initialize the k_recv and k_data state machine */
821 k_state_saved = k_state;
823 n = 0; /* just to get rid of a warning */
826 /* expect this "type" sequence (but don't check):
831 B: break transmission
834 /* enter main loop */
836 /* set the send packet pointer to begining of send packet parms */
837 send_ptr = send_parms;
839 /* With each packet, start summing the bytes starting with the length.
840 Save the current sequence number.
841 Note the type of the packet.
842 If a character less than SPACE (0x20) is received - error.
846 /* OLD CODE, Prior to checking sequence numbers */
847 /* first have all state machines save current states */
848 k_state_saved = k_state;
853 /* wait for the starting character or ^C */
856 case START_CHAR: /* start packet */
858 case ETX_CHAR: /* ^C waiting for packet */
865 /* get length of packet */
868 if ((new_char & 0xE0) == 0)
870 sum += new_char & 0xff;
871 length = untochar (new_char);
872 /* get sequence number */
874 if ((new_char & 0xE0) == 0)
876 sum += new_char & 0xff;
877 n = untochar (new_char);
880 /* NEW CODE - check sequence numbers for retried packets */
881 /* Note - this new code assumes that the sequence number is correctly
882 * received. Handling an invalid sequence number adds another layer
883 * of complexity that may not be needed - yet! At this time, I'm hoping
884 * that I don't need to buffer the incoming data packets and can write
885 * the data into memory in real time.
888 /* same sequence number, restore the previous state */
889 k_state = k_state_saved;
892 /* new sequence number, checkpoint the download */
894 k_state_saved = k_state;
899 /* get packet type */
901 if ((new_char & 0xE0) == 0)
903 sum += new_char & 0xff;
906 /* check for extended length */
908 /* (length byte was 0, decremented twice) */
909 /* get the two length bytes */
911 if ((new_char & 0xE0) == 0)
913 sum += new_char & 0xff;
914 len_hi = untochar (new_char);
916 if ((new_char & 0xE0) == 0)
918 sum += new_char & 0xff;
919 len_lo = untochar (new_char);
920 length = len_hi * 95 + len_lo;
921 /* check header checksum */
923 if ((new_char & 0xE0) == 0)
925 if (new_char != tochar ((sum + ((sum >> 6) & 0x03)) & 0x3f))
927 sum += new_char & 0xff;
928 /* --length; */ /* new length includes only data and block check to come */
930 /* bring in rest of packet */
933 if ((new_char & 0xE0) == 0)
935 sum += new_char & 0xff;
937 if (k_state == DATA_TYPE) {
938 /* pass on the data if this is a data packet */
939 k_data_char (new_char);
940 } else if (k_state == SEND_TYPE) {
941 /* save send pack in buffer as is */
942 *send_ptr++ = new_char;
943 /* if too much data, back off the pointer */
944 if (send_ptr >= &send_parms[SEND_DATA_SIZE])
948 /* get and validate checksum character */
950 if ((new_char & 0xE0) == 0)
952 if (new_char != tochar ((sum + ((sum >> 6) & 0x03)) & 0x3f))
956 if (new_char != END_CHAR) {
958 /* restore state machines */
959 k_state = k_state_saved;
961 /* send a negative acknowledge packet in */
963 } else if (k_state == SEND_TYPE) {
964 /* crack the protocol parms, build an appropriate ack packet */
965 handle_send_packet (n);
967 /* send simple acknowledge packet in */
969 /* quit if end of transmission */
970 if (k_state == BREAK_TYPE)
975 return ((ulong) os_data_addr - (ulong) bin_start_address);
978 static int getcxmodem(void) {
983 static ulong load_serial_ymodem (ulong offset)
989 connection_info_t info;
990 char ymodemBuf[1024];
991 ulong store_addr = ~0;
995 info.mode=xyzModem_ymodem;
996 res=xyzModem_stream_open(&info, &err);
999 while ((res=xyzModem_stream_read(ymodemBuf, 1024, &err)) > 0 ){
1000 store_addr = addr + offset;
1003 #ifndef CFG_NO_FLASH
1004 if (addr2info(store_addr)) {
1007 rc = flash_write((char *)ymodemBuf,store_addr,res);
1015 memcpy ((char *)(store_addr), ymodemBuf, res);
1021 printf ("%s\n",xyzModem_error(err));
1024 xyzModem_stream_close(&err);
1025 xyzModem_stream_terminate(false,&getcxmodem);
1028 flush_cache (offset, size);
1030 printf("## Total Size = 0x%08x = %d Bytes\n", size, size);
1031 sprintf(buf, "%X", size);
1032 setenv("filesize", buf);
1037 #endif /* CFG_CMD_LOADB */
1039 /* -------------------------------------------------------------------- */
1041 #if (CONFIG_COMMANDS & CFG_CMD_LOADS)
1043 #ifdef CFG_LOADS_BAUD_CHANGE
1045 loads, 3, 0, do_load_serial,
1046 "loads - load S-Record file over serial line\n",
1047 "[ off ] [ baud ]\n"
1048 " - load S-Record file over serial line"
1049 " with offset 'off' and baudrate 'baud'\n"
1052 #else /* ! CFG_LOADS_BAUD_CHANGE */
1054 loads, 2, 0, do_load_serial,
1055 "loads - load S-Record file over serial line\n",
1057 " - load S-Record file over serial line with offset 'off'\n"
1059 #endif /* CFG_LOADS_BAUD_CHANGE */
1062 * SAVES always requires LOADS support, but not vice versa
1066 #if (CONFIG_COMMANDS & CFG_CMD_SAVES)
1067 #ifdef CFG_LOADS_BAUD_CHANGE
1069 saves, 4, 0, do_save_serial,
1070 "saves - save S-Record file over serial line\n",
1071 "[ off ] [size] [ baud ]\n"
1072 " - save S-Record file over serial line"
1073 " with offset 'off', size 'size' and baudrate 'baud'\n"
1075 #else /* ! CFG_LOADS_BAUD_CHANGE */
1077 saves, 3, 0, do_save_serial,
1078 "saves - save S-Record file over serial line\n",
1080 " - save S-Record file over serial line with offset 'off' and size 'size'\n"
1082 #endif /* CFG_LOADS_BAUD_CHANGE */
1083 #endif /* CFG_CMD_SAVES */
1084 #endif /* CFG_CMD_LOADS */
1087 #if (CONFIG_COMMANDS & CFG_CMD_LOADB)
1089 loadb, 3, 0, do_load_serial_bin,
1090 "loadb - load binary file over serial line (kermit mode)\n",
1091 "[ off ] [ baud ]\n"
1092 " - load binary file over serial line"
1093 " with offset 'off' and baudrate 'baud'\n"
1097 loady, 3, 0, do_load_serial_bin,
1098 "loady - load binary file over serial line (ymodem mode)\n",
1099 "[ off ] [ baud ]\n"
1100 " - load binary file over serial line"
1101 " with offset 'off' and baudrate 'baud'\n"
1104 #endif /* CFG_CMD_LOADB */
1106 /* -------------------------------------------------------------------- */
1108 #if (CONFIG_COMMANDS & CFG_CMD_HWFLOW)
1109 int do_hwflow (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
1111 extern int hwflow_onoff(int);
1114 if (strcmp(argv[1], "off") == 0)
1117 if (strcmp(argv[1], "on") == 0)
1120 printf("Usage: %s\n", cmdtp->usage);
1122 printf("RTS/CTS hardware flow control: %s\n", hwflow_onoff(0) ? "on" : "off");
1126 /* -------------------------------------------------------------------- */
1129 hwflow, 2, 0, do_hwflow,
1130 "hwflow - turn the harwdare flow control on/off\n",
1131 "[on|off]\n - change RTS/CTS hardware flow control over serial line\n"
1134 #endif /* CFG_CMD_HWFLOW */