common/console.c

   1 /*
   2  * (C) Copyright 2000
   3  * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <stdarg.h>
  26 #include <malloc.h>
  27 #include <stdio_dev.h>
  28 #include <exports.h>
  29
  30 DECLARE_GLOBAL_DATA_PTR;
  31
  32 #ifdef CONFIG_SYS_CONSOLE_IS_IN_ENV
  33 /*
  34  * if overwrite_console returns 1, the stdin, stderr and stdout
  35  * are switched to the serial port, else the settings in the
  36  * environment are used
  37  */
  38 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
  39 extern int overwrite_console(void);
  40 #define OVERWRITE_CONSOLE overwrite_console()
  41 #else
  42 #define OVERWRITE_CONSOLE 0
  43 #endif /* CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE */
  44
  45 #endif /* CONFIG_SYS_CONSOLE_IS_IN_ENV */
  46
  47 static int console_setfile(int file, struct stdio_dev * dev)
  48 {
  49         int error = 0;
  50
  51         if (dev == NULL)
  52                 return -1;
  53
  54         switch (file) {
  55         case stdin:
  56         case stdout:
  57         case stderr:
  58                 /* Start new device */
  59                 if (dev->start) {
  60                         error = dev->start();
  61                         /* If it's not started dont use it */
  62                         if (error < 0)
  63                                 break;
  64                 }
  65
  66                 /* Assign the new device (leaving the existing one started) */
  67                 stdio_devices[file] = dev;
  68
  69                 /*
  70                  * Update monitor functions
  71                  * (to use the console stuff by other applications)
  72                  */
  73                 switch (file) {
  74                 case stdin:
  75                         gd->jt[XF_getc] = dev->getc;
  76                         gd->jt[XF_tstc] = dev->tstc;
  77                         break;
  78                 case stdout:
  79                         gd->jt[XF_putc] = dev->putc;
  80                         gd->jt[XF_puts] = dev->puts;
  81                         gd->jt[XF_printf] = printf;
  82                         break;
  83                 }
  84                 break;
  85
  86         default:                /* Invalid file ID */
  87                 error = -1;
  88         }
  89         return error;
  90 }
  91
  92 #if defined(CONFIG_CONSOLE_MUX)
  93 /** Console I/O multiplexing *******************************************/
  94
  95 static struct stdio_dev *tstcdev;
  96 struct stdio_dev **console_devices[MAX_FILES];
  97 int cd_count[MAX_FILES];
  98
  99 /*
 100  * This depends on tstc() always being called before getc().
 101  * This is guaranteed to be true because this routine is called
 102  * only from fgetc() which assures it.
 103  * No attempt is made to demultiplex multiple input sources.
 104  */
 105 static int console_getc(int file)
 106 {
 107         unsigned char ret;
 108
 109         /* This is never called with testcdev == NULL */
 110         ret = tstcdev->getc();
 111         tstcdev = NULL;
 112         return ret;
 113 }
 114
 115 static int console_tstc(int file)
 116 {
 117         int i, ret;
 118         struct stdio_dev *dev;
 119
 120         disable_ctrlc(1);
 121         for (i = 0; i < cd_count[file]; i++) {
 122                 dev = console_devices[file][i];
 123                 if (dev->tstc != NULL) {
 124                         ret = dev->tstc();
 125                         if (ret > 0) {
 126                                 tstcdev = dev;
 127                                 disable_ctrlc(0);
 128                                 return ret;
 129                         }
 130                 }
 131         }
 132         disable_ctrlc(0);
 133
 134         return 0;
 135 }
 136
 137 static void console_putc(int file, const char c)
 138 {
 139         int i;
 140         struct stdio_dev *dev;
 141
 142         for (i = 0; i < cd_count[file]; i++) {
 143                 dev = console_devices[file][i];
 144                 if (dev->putc != NULL)
 145                         dev->putc(c);
 146         }
 147 }
 148
 149 static void console_puts(int file, const char *s)
 150 {
 151         int i;
 152         struct stdio_dev *dev;
 153
 154         for (i = 0; i < cd_count[file]; i++) {
 155                 dev = console_devices[file][i];
 156                 if (dev->puts != NULL)
 157                         dev->puts(s);
 158         }
 159 }
 160
 161 static inline void console_printdevs(int file)
 162 {
 163         iomux_printdevs(file);
 164 }
 165
 166 static inline void console_doenv(int file, struct stdio_dev *dev)
 167 {
 168         iomux_doenv(file, dev->name);
 169 }
 170 #else
 171 static inline int console_getc(int file)
 172 {
 173         return stdio_devices[file]->getc();
 174 }
 175
 176 static inline int console_tstc(int file)
 177 {
 178         return stdio_devices[file]->tstc();
 179 }
 180
 181 static inline void console_putc(int file, const char c)
 182 {
 183         stdio_devices[file]->putc(c);
 184 }
 185
 186 static inline void console_puts(int file, const char *s)
 187 {
 188         stdio_devices[file]->puts(s);
 189 }
 190
 191 static inline void console_printdevs(int file)
 192 {
 193         printf("%s\n", stdio_devices[file]->name);
 194 }
 195
 196 static inline void console_doenv(int file, struct stdio_dev *dev)
 197 {
 198         console_setfile(file, dev);
 199 }
 200 #endif /* defined(CONFIG_CONSOLE_MUX) */
 201
 202 /** U-Boot INITIAL CONSOLE-NOT COMPATIBLE FUNCTIONS *************************/
 203
 204 int serial_printf(const char *fmt, ...)
 205 {
 206         va_list args;
 207         uint i;
 208         char printbuffer[CONFIG_SYS_PBSIZE];
 209
 210         va_start(args, fmt);
 211
 212         /* For this to work, printbuffer must be larger than
 213          * anything we ever want to print.
 214          */
 215         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 216         va_end(args);
 217
 218         serial_puts(printbuffer);
 219         return i;
 220 }
 221
 222 int fgetc(int file)
 223 {
 224         if (file < MAX_FILES) {
 225 #if defined(CONFIG_CONSOLE_MUX)
 226                 /*
 227                  * Effectively poll for input wherever it may be available.
 228                  */
 229                 for (;;) {
 230                         /*
 231                          * Upper layer may have already called tstc() so
 232                          * check for that first.
 233                          */
 234                         if (tstcdev != NULL)
 235                                 return console_getc(file);
 236                         console_tstc(file);
 237 #ifdef CONFIG_WATCHDOG
 238                         /*
 239                          * If the watchdog must be rate-limited then it should
 240                          * already be handled in board-specific code.
 241                          */
 242                          udelay(1);
 243 #endif
 244                 }
 245 #else
 246                 return console_getc(file);
 247 #endif
 248         }
 249
 250         return -1;
 251 }
 252
 253 int ftstc(int file)
 254 {
 255         if (file < MAX_FILES)
 256                 return console_tstc(file);
 257
 258         return -1;
 259 }
 260
 261 void fputc(int file, const char c)
 262 {
 263         if (file < MAX_FILES)
 264                 console_putc(file, c);
 265 }
 266
 267 void fputs(int file, const char *s)
 268 {
 269         if (file < MAX_FILES)
 270                 console_puts(file, s);
 271 }
 272
 273 int fprintf(int file, const char *fmt, ...)
 274 {
 275         va_list args;
 276         uint i;
 277         char printbuffer[CONFIG_SYS_PBSIZE];
 278
 279         va_start(args, fmt);
 280
 281         /* For this to work, printbuffer must be larger than
 282          * anything we ever want to print.
 283          */
 284         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 285         va_end(args);
 286
 287         /* Send to desired file */
 288         fputs(file, printbuffer);
 289         return i;
 290 }
 291
 292 /** U-Boot INITIAL CONSOLE-COMPATIBLE FUNCTION *****************************/
 293
 294 int getc(void)
 295 {
 296 #ifdef CONFIG_DISABLE_CONSOLE
 297         if (gd->flags & GD_FLG_DISABLE_CONSOLE)
 298                 return 0;
 299 #endif
 300
 301         if (!gd->have_console)
 302                 return 0;
 303
 304         if (gd->flags & GD_FLG_DEVINIT) {
 305                 /* Get from the standard input */
 306                 return fgetc(stdin);
 307         }
 308
 309         /* Send directly to the handler */
 310         return serial_getc();
 311 }
 312
 313 int tstc(void)
 314 {
 315 #ifdef CONFIG_DISABLE_CONSOLE
 316         if (gd->flags & GD_FLG_DISABLE_CONSOLE)
 317                 return 0;
 318 #endif
 319
 320         if (!gd->have_console)
 321                 return 0;
 322
 323         if (gd->flags & GD_FLG_DEVINIT) {
 324                 /* Test the standard input */
 325                 return ftstc(stdin);
 326         }
 327
 328         /* Send directly to the handler */
 329         return serial_tstc();
 330 }
 331
 332 #ifdef CONFIG_PRE_CONSOLE_BUFFER
 333 #define CIRC_BUF_IDX(idx) ((idx) % (unsigned long)CONFIG_PRE_CON_BUF_SZ)
 334
 335 static void pre_console_putc(const char c)
 336 {
 337         char *buffer = (char *)CONFIG_PRE_CON_BUF_ADDR;
 338
 339         buffer[CIRC_BUF_IDX(gd->precon_buf_idx++)] = c;
 340 }
 341
 342 static void pre_console_puts(const char *s)
 343 {
 344         while (*s)
 345                 pre_console_putc(*s++);
 346 }
 347
 348 static void print_pre_console_buffer(void)
 349 {
 350         unsigned long i = 0;
 351         char *buffer = (char *)CONFIG_PRE_CON_BUF_ADDR;
 352
 353         if (gd->precon_buf_idx > CONFIG_PRE_CON_BUF_SZ)
 354                 i = gd->precon_buf_idx - CONFIG_PRE_CON_BUF_SZ;
 355
 356         while (i < gd->precon_buf_idx)
 357                 putc(buffer[CIRC_BUF_IDX(i++)]);
 358 }
 359 #else
 360 static inline void pre_console_putc(const char c) {}
 361 static inline void pre_console_puts(const char *s) {}
 362 static inline void print_pre_console_buffer(void) {}
 363 #endif
 364
 365 void putc(const char c)
 366 {
 367 #ifdef CONFIG_SILENT_CONSOLE
 368         if (gd->flags & GD_FLG_SILENT)
 369                 return;
 370 #endif
 371
 372 #ifdef CONFIG_DISABLE_CONSOLE
 373         if (gd->flags & GD_FLG_DISABLE_CONSOLE)
 374                 return;
 375 #endif
 376
 377         if (!gd->have_console)
 378                 return pre_console_putc(c);
 379
 380         if (gd->flags & GD_FLG_DEVINIT) {
 381                 /* Send to the standard output */
 382                 fputc(stdout, c);
 383         } else {
 384                 /* Send directly to the handler */
 385                 serial_putc(c);
 386         }
 387 }
 388
 389 void puts(const char *s)
 390 {
 391 #ifdef CONFIG_SILENT_CONSOLE
 392         if (gd->flags & GD_FLG_SILENT)
 393                 return;
 394 #endif
 395
 396 #ifdef CONFIG_DISABLE_CONSOLE
 397         if (gd->flags & GD_FLG_DISABLE_CONSOLE)
 398                 return;
 399 #endif
 400
 401         if (!gd->have_console)
 402                 return pre_console_puts(s);
 403
 404         if (gd->flags & GD_FLG_DEVINIT) {
 405                 /* Send to the standard output */
 406                 fputs(stdout, s);
 407         } else {
 408                 /* Send directly to the handler */
 409                 serial_puts(s);
 410         }
 411 }
 412
 413 int printf(const char *fmt, ...)
 414 {
 415         va_list args;
 416         uint i;
 417         char printbuffer[CONFIG_SYS_PBSIZE];
 418
 419 #ifndef CONFIG_PRE_CONSOLE_BUFFER
 420         if (!gd->have_console)
 421                 return 0;
 422 #endif
 423
 424         va_start(args, fmt);
 425
 426         /* For this to work, printbuffer must be larger than
 427          * anything we ever want to print.
 428          */
 429         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 430         va_end(args);
 431
 432         /* Print the string */
 433         puts(printbuffer);
 434         return i;
 435 }
 436
 437 int vprintf(const char *fmt, va_list args)
 438 {
 439         uint i;
 440         char printbuffer[CONFIG_SYS_PBSIZE];
 441
 442 #ifndef CONFIG_PRE_CONSOLE_BUFFER
 443         if (!gd->have_console)
 444                 return 0;
 445 #endif
 446
 447         /* For this to work, printbuffer must be larger than
 448          * anything we ever want to print.
 449          */
 450         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 451
 452         /* Print the string */
 453         puts(printbuffer);
 454         return i;
 455 }
 456
 457 /* test if ctrl-c was pressed */
 458 static int ctrlc_disabled = 0;  /* see disable_ctrl() */
 459 static int ctrlc_was_pressed = 0;
 460 int ctrlc(void)
 461 {
 462         if (!ctrlc_disabled && gd->have_console) {
 463                 if (tstc()) {
 464                         switch (getc()) {
 465                         case 0x03:              /* ^C - Control C */
 466                                 ctrlc_was_pressed = 1;
 467                                 return 1;
 468                         default:
 469                                 break;
 470                         }
 471                 }
 472         }
 473         return 0;
 474 }
 475
 476 /* pass 1 to disable ctrlc() checking, 0 to enable.
 477  * returns previous state
 478  */
 479 int disable_ctrlc(int disable)
 480 {
 481         int prev = ctrlc_disabled;      /* save previous state */
 482
 483         ctrlc_disabled = disable;
 484         return prev;
 485 }
 486
 487 int had_ctrlc (void)
 488 {
 489         return ctrlc_was_pressed;
 490 }
 491
 492 void clear_ctrlc(void)
 493 {
 494         ctrlc_was_pressed = 0;
 495 }
 496
 497 #ifdef CONFIG_MODEM_SUPPORT_DEBUG
 498 char    screen[1024];
 499 char *cursor = screen;
 500 int once = 0;
 501 inline void dbg(const char *fmt, ...)
 502 {
 503         va_list args;
 504         uint    i;
 505         char    printbuffer[CONFIG_SYS_PBSIZE];
 506
 507         if (!once) {
 508                 memset(screen, 0, sizeof(screen));
 509                 once++;
 510         }
 511
 512         va_start(args, fmt);
 513
 514         /* For this to work, printbuffer must be larger than
 515          * anything we ever want to print.
 516          */
 517         i = vsnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 518         va_end(args);
 519
 520         if ((screen + sizeof(screen) - 1 - cursor)
 521             < strlen(printbuffer) + 1) {
 522                 memset(screen, 0, sizeof(screen));
 523                 cursor = screen;
 524         }
 525         sprintf(cursor, printbuffer);
 526         cursor += strlen(printbuffer);
 527
 528 }
 529 #else
 530 inline void dbg(const char *fmt, ...)
 531 {
 532 }
 533 #endif
 534
 535 /** U-Boot INIT FUNCTIONS *************************************************/
 536
 537 struct stdio_dev *search_device(int flags, const char *name)
 538 {
 539         struct stdio_dev *dev;
 540
 541         dev = stdio_get_by_name(name);
 542
 543         if (dev && (dev->flags & flags))
 544                 return dev;
 545
 546         return NULL;
 547 }
 548
 549 int console_assign(int file, const char *devname)
 550 {
 551         int flag;
 552         struct stdio_dev *dev;
 553
 554         /* Check for valid file */
 555         switch (file) {
 556         case stdin:
 557                 flag = DEV_FLAGS_INPUT;
 558                 break;
 559         case stdout:
 560         case stderr:
 561                 flag = DEV_FLAGS_OUTPUT;
 562                 break;
 563         default:
 564                 return -1;
 565         }
 566
 567         /* Check for valid device name */
 568
 569         dev = search_device(flag, devname);
 570
 571         if (dev)
 572                 return console_setfile(file, dev);
 573
 574         return -1;
 575 }
 576
 577 /* Called before relocation - use serial functions */
 578 int console_init_f(void)
 579 {
 580         gd->have_console = 1;
 581
 582 #ifdef CONFIG_SILENT_CONSOLE
 583         if (getenv("silent") != NULL)
 584                 gd->flags |= GD_FLG_SILENT;
 585 #endif
 586
 587         print_pre_console_buffer();
 588
 589         return 0;
 590 }
 591
 592 void stdio_print_current_devices(void)
 593 {
 594 #ifndef CONFIG_SYS_CONSOLE_INFO_QUIET
 595         /* Print information */
 596         puts("In:    ");
 597         if (stdio_devices[stdin] == NULL) {
 598                 puts("No input devices available!\n");
 599         } else {
 600                 printf ("%s\n", stdio_devices[stdin]->name);
 601         }
 602
 603         puts("Out:   ");
 604         if (stdio_devices[stdout] == NULL) {
 605                 puts("No output devices available!\n");
 606         } else {
 607                 printf ("%s\n", stdio_devices[stdout]->name);
 608         }
 609
 610         puts("Err:   ");
 611         if (stdio_devices[stderr] == NULL) {
 612                 puts("No error devices available!\n");
 613         } else {
 614                 printf ("%s\n", stdio_devices[stderr]->name);
 615         }
 616 #endif /* CONFIG_SYS_CONSOLE_INFO_QUIET */
 617 }
 618
 619 #ifdef CONFIG_SYS_CONSOLE_IS_IN_ENV
 620 /* Called after the relocation - use desired console functions */
 621 int console_init_r(void)
 622 {
 623         char *stdinname, *stdoutname, *stderrname;
 624         struct stdio_dev *inputdev = NULL, *outputdev = NULL, *errdev = NULL;
 625 #ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
 626         int i;
 627 #endif /* CONFIG_SYS_CONSOLE_ENV_OVERWRITE */
 628 #ifdef CONFIG_CONSOLE_MUX
 629         int iomux_err = 0;
 630 #endif
 631
 632         /* set default handlers at first */
 633         gd->jt[XF_getc] = serial_getc;
 634         gd->jt[XF_tstc] = serial_tstc;
 635         gd->jt[XF_putc] = serial_putc;
 636         gd->jt[XF_puts] = serial_puts;
 637         gd->jt[XF_printf] = serial_printf;
 638
 639         /* stdin stdout and stderr are in environment */
 640         /* scan for it */
 641         stdinname  = getenv("stdin");
 642         stdoutname = getenv("stdout");
 643         stderrname = getenv("stderr");
 644
 645         if (OVERWRITE_CONSOLE == 0) {   /* if not overwritten by config switch */
 646                 inputdev  = search_device(DEV_FLAGS_INPUT,  stdinname);
 647                 outputdev = search_device(DEV_FLAGS_OUTPUT, stdoutname);
 648                 errdev    = search_device(DEV_FLAGS_OUTPUT, stderrname);
 649 #ifdef CONFIG_CONSOLE_MUX
 650                 iomux_err = iomux_doenv(stdin, stdinname);
 651                 iomux_err += iomux_doenv(stdout, stdoutname);
 652                 iomux_err += iomux_doenv(stderr, stderrname);
 653                 if (!iomux_err)
 654                         /* Successful, so skip all the code below. */
 655                         goto done;
 656 #endif
 657         }
 658         /* if the devices are overwritten or not found, use default device */
 659         if (inputdev == NULL) {
 660                 inputdev  = search_device(DEV_FLAGS_INPUT,  "serial");
 661         }
 662         if (outputdev == NULL) {
 663                 outputdev = search_device(DEV_FLAGS_OUTPUT, "serial");
 664         }
 665         if (errdev == NULL) {
 666                 errdev    = search_device(DEV_FLAGS_OUTPUT, "serial");
 667         }
 668         /* Initializes output console first */
 669         if (outputdev != NULL) {
 670                 /* need to set a console if not done above. */
 671                 console_doenv(stdout, outputdev);
 672         }
 673         if (errdev != NULL) {
 674                 /* need to set a console if not done above. */
 675                 console_doenv(stderr, errdev);
 676         }
 677         if (inputdev != NULL) {
 678                 /* need to set a console if not done above. */
 679                 console_doenv(stdin, inputdev);
 680         }
 681
 682 #ifdef CONFIG_CONSOLE_MUX
 683 done:
 684 #endif
 685
 686         gd->flags |= GD_FLG_DEVINIT;    /* device initialization completed */
 687
 688         stdio_print_current_devices();
 689
 690 #ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
 691         /* set the environment variables (will overwrite previous env settings) */
 692         for (i = 0; i < 3; i++) {
 693                 setenv(stdio_names[i], stdio_devices[i]->name);
 694         }
 695 #endif /* CONFIG_SYS_CONSOLE_ENV_OVERWRITE */
 696
 697 #if 0
 698         /* If nothing usable installed, use only the initial console */
 699         if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
 700                 return 0;
 701 #endif
 702         return 0;
 703 }
 704
 705 #else /* CONFIG_SYS_CONSOLE_IS_IN_ENV */
 706
 707 /* Called after the relocation - use desired console functions */
 708 int console_init_r(void)
 709 {
 710         struct stdio_dev *inputdev = NULL, *outputdev = NULL;
 711         int i;
 712         struct list_head *list = stdio_get_list();
 713         struct list_head *pos;
 714         struct stdio_dev *dev;
 715
 716 #ifdef CONFIG_SPLASH_SCREEN
 717         /*
 718          * suppress all output if splash screen is enabled and we have
 719          * a bmp to display. We redirect the output from frame buffer
 720          * console to serial console in this case or suppress it if
 721          * "silent" mode was requested.
 722          */
 723         if (getenv("splashimage") != NULL) {
 724                 if (!(gd->flags & GD_FLG_SILENT))
 725                         outputdev = search_device (DEV_FLAGS_OUTPUT, "serial");
 726         }
 727 #endif
 728
 729         /* Scan devices looking for input and output devices */
 730         list_for_each(pos, list) {
 731                 dev = list_entry(pos, struct stdio_dev, list);
 732
 733                 if ((dev->flags & DEV_FLAGS_INPUT) && (inputdev == NULL)) {
 734                         inputdev = dev;
 735                 }
 736                 if ((dev->flags & DEV_FLAGS_OUTPUT) && (outputdev == NULL)) {
 737                         outputdev = dev;
 738                 }
 739                 if(inputdev && outputdev)
 740                         break;
 741         }
 742
 743         /* Initializes output console first */
 744         if (outputdev != NULL) {
 745                 console_setfile(stdout, outputdev);
 746                 console_setfile(stderr, outputdev);
 747 #ifdef CONFIG_CONSOLE_MUX
 748                 console_devices[stdout][0] = outputdev;
 749                 console_devices[stderr][0] = outputdev;
 750 #endif
 751         }
 752
 753         /* Initializes input console */
 754         if (inputdev != NULL) {
 755                 console_setfile(stdin, inputdev);
 756 #ifdef CONFIG_CONSOLE_MUX
 757                 console_devices[stdin][0] = inputdev;
 758 #endif
 759         }
 760
 761         gd->flags |= GD_FLG_DEVINIT;    /* device initialization completed */
 762
 763         stdio_print_current_devices();
 764
 765         /* Setting environment variables */
 766         for (i = 0; i < 3; i++) {
 767                 setenv(stdio_names[i], stdio_devices[i]->name);
 768         }
 769
 770 #if 0
 771         /* If nothing usable installed, use only the initial console */
 772         if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
 773                 return 0;
 774 #endif
 775
 776         return 0;
 777 }
 778
 779 #endif /* CONFIG_SYS_CONSOLE_IS_IN_ENV */