summaryrefslogtreecommitdiff
path: root/common/console.c
blob: 0b0dd76256c7c865668add13a2ae89eb1530cb3f (plain)
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
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2000
 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
 */

#include <common.h>
#include <console.h>
#include <debug_uart.h>
#include <dm.h>
#include <stdarg.h>
#include <iomux.h>
#include <malloc.h>
#include <mapmem.h>
#include <os.h>
#include <serial.h>
#include <stdio_dev.h>
#include <exports.h>
#include <environment.h>
#include <watchdog.h>

DECLARE_GLOBAL_DATA_PTR;

static int on_console(const char *name, const char *value, enum env_op op,
	int flags)
{
	int console = -1;

	/* Check for console redirection */
	if (strcmp(name, "stdin") == 0)
		console = stdin;
	else if (strcmp(name, "stdout") == 0)
		console = stdout;
	else if (strcmp(name, "stderr") == 0)
		console = stderr;

	/* if not actually setting a console variable, we don't care */
	if (console == -1 || (gd->flags & GD_FLG_DEVINIT) == 0)
		return 0;

	switch (op) {
	case env_op_create:
	case env_op_overwrite:

#if CONFIG_IS_ENABLED(CONSOLE_MUX)
		if (iomux_doenv(console, value))
			return 1;
#else
		/* Try assigning specified device */
		if (console_assign(console, value) < 0)
			return 1;
#endif
		return 0;

	case env_op_delete:
		if ((flags & H_FORCE) == 0)
			printf("Can't delete \"%s\"\n", name);
		return 1;

	default:
		return 0;
	}
}
U_BOOT_ENV_CALLBACK(console, on_console);

#ifdef CONFIG_SILENT_CONSOLE
static int on_silent(const char *name, const char *value, enum env_op op,
	int flags)
{
#if !CONFIG_IS_ENABLED(SILENT_CONSOLE_UPDATE_ON_SET)
	if (flags & H_INTERACTIVE)
		return 0;
#endif
#if !CONFIG_IS_ENABLED(SILENT_CONSOLE_UPDATE_ON_RELOC)
	if ((flags & H_INTERACTIVE) == 0)
		return 0;
#endif

	if (value != NULL)
		gd->flags |= GD_FLG_SILENT;
	else
		gd->flags &= ~GD_FLG_SILENT;

	return 0;
}
U_BOOT_ENV_CALLBACK(silent, on_silent);
#endif

#if CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV)
/*
 * if overwrite_console returns 1, the stdin, stderr and stdout
 * are switched to the serial port, else the settings in the
 * environment are used
 */
#ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
extern int overwrite_console(void);
#define OVERWRITE_CONSOLE overwrite_console()
#else
#define OVERWRITE_CONSOLE 0
#endif /* CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE */

#endif /* CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV) */

static int console_setfile(int file, struct stdio_dev * dev)
{
	int error = 0;

	if (dev == NULL)
		return -1;

	switch (file) {
	case stdin:
	case stdout:
	case stderr:
		/* Start new device */
		if (dev->start) {
			error = dev->start(dev);
			/* If it's not started dont use it */
			if (error < 0)
				break;
		}

		/* Assign the new device (leaving the existing one started) */
		stdio_devices[file] = dev;

		/*
		 * Update monitor functions
		 * (to use the console stuff by other applications)
		 */
		switch (file) {
		case stdin:
			gd->jt->getc = getc;
			gd->jt->tstc = tstc;
			break;
		case stdout:
			gd->jt->putc  = putc;
			gd->jt->puts  = puts;
			gd->jt->printf = printf;
			break;
		}
		break;

	default:		/* Invalid file ID */
		error = -1;
	}
	return error;
}

/**
 * console_dev_is_serial() - Check if a stdio device is a serial device
 *
 * @sdev: Device to check
 * @return true if this device is in the serial uclass (or for pre-driver-model,
 * whether it is called "serial".
 */
static bool console_dev_is_serial(struct stdio_dev *sdev)
{
	bool is_serial;

#ifdef CONFIG_DM_SERIAL
	if (sdev->flags & DEV_FLAGS_DM) {
		struct udevice *dev = sdev->priv;

		is_serial = device_get_uclass_id(dev) == UCLASS_SERIAL;
	} else
#endif
	is_serial = !strcmp(sdev->name, "serial");

	return is_serial;
}

#if CONFIG_IS_ENABLED(CONSOLE_MUX)
/** Console I/O multiplexing *******************************************/

static struct stdio_dev *tstcdev;
struct stdio_dev **console_devices[MAX_FILES];
int cd_count[MAX_FILES];

/*
 * This depends on tstc() always being called before getc().
 * This is guaranteed to be true because this routine is called
 * only from fgetc() which assures it.
 * No attempt is made to demultiplex multiple input sources.
 */
static int console_getc(int file)
{
	unsigned char ret;

	/* This is never called with testcdev == NULL */
	ret = tstcdev->getc(tstcdev);
	tstcdev = NULL;
	return ret;
}

static int console_tstc(int file)
{
	int i, ret;
	struct stdio_dev *dev;
	int prev;

	prev = disable_ctrlc(1);
	for (i = 0; i < cd_count[file]; i++) {
		dev = console_devices[file][i];
		if (dev->tstc != NULL) {
			ret = dev->tstc(dev);
			if (ret > 0) {
				tstcdev = dev;
				disable_ctrlc(prev);
				return ret;
			}
		}
	}
	disable_ctrlc(prev);

	return 0;
}

static void console_putc(int file, const char c)
{
	int i;
	struct stdio_dev *dev;

	for (i = 0; i < cd_count[file]; i++) {
		dev = console_devices[file][i];
		if (dev->putc != NULL)
			dev->putc(dev, c);
	}
}

static void console_puts_noserial(int file, const char *s)
{
	int i;
	struct stdio_dev *dev;

	for (i = 0; i < cd_count[file]; i++) {
		dev = console_devices[file][i];
		if (dev->puts != NULL && !console_dev_is_serial(dev))
			dev->puts(dev, s);
	}
}

static void console_puts(int file, const char *s)
{
	int i;
	struct stdio_dev *dev;

	for (i = 0; i < cd_count[file]; i++) {
		dev = console_devices[file][i];
		if (dev->puts != NULL)
			dev->puts(dev, s);
	}
}

static inline void console_doenv(int file, struct stdio_dev *dev)
{
	iomux_doenv(file, dev->name);
}
#else
static inline int console_getc(int file)
{
	return stdio_devices[file]->getc(stdio_devices[file]);
}

static inline int console_tstc(int file)
{
	return stdio_devices[file]->tstc(stdio_devices[file]);
}

static inline void console_putc(int file, const char c)
{
	stdio_devices[file]->putc(stdio_devices[file], c);
}

static inline void console_puts_noserial(int file, const char *s)
{
	if (!console_dev_is_serial(stdio_devices[file]))
		stdio_devices[file]->puts(stdio_devices[file], s);
}

static inline void console_puts(int file, const char *s)
{
	stdio_devices[file]->puts(stdio_devices[file], s);
}

static inline void console_doenv(int file, struct stdio_dev *dev)
{
	console_setfile(file, dev);
}
#endif /* CONIFIG_IS_ENABLED(CONSOLE_MUX) */

/** U-Boot INITIAL CONSOLE-NOT COMPATIBLE FUNCTIONS *************************/

int serial_printf(const char *fmt, ...)
{
	va_list args;
	uint i;
	char printbuffer[CONFIG_SYS_PBSIZE];

	va_start(args, fmt);

	/* For this to work, printbuffer must be larger than
	 * anything we ever want to print.
	 */
	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
	va_end(args);

	serial_puts(printbuffer);
	return i;
}

int fgetc(int file)
{
	if (file < MAX_FILES) {
		/*
		 * Effectively poll for input wherever it may be available.
		 */
		for (;;) {
			WATCHDOG_RESET();
#if CONFIG_IS_ENABLED(CONSOLE_MUX)
			/*
			 * Upper layer may have already called tstc() so
			 * check for that first.
			 */
			if (tstcdev != NULL)
				return console_getc(file);
			console_tstc(file);
#else
			if (console_tstc(file))
				return console_getc(file);
#endif
#ifdef CONFIG_WATCHDOG
			/*
			 * If the watchdog must be rate-limited then it should
			 * already be handled in board-specific code.
			 */
			 udelay(1);
#endif
		}
	}

	return -1;
}

int ftstc(int file)
{
	if (file < MAX_FILES)
		return console_tstc(file);

	return -1;
}

void fputc(int file, const char c)
{
	if (file < MAX_FILES)
		console_putc(file, c);
}

void fputs(int file, const char *s)
{
	if (file < MAX_FILES)
		console_puts(file, s);
}

int fprintf(int file, const char *fmt, ...)
{
	va_list args;
	uint i;
	char printbuffer[CONFIG_SYS_PBSIZE];

	va_start(args, fmt);

	/* For this to work, printbuffer must be larger than
	 * anything we ever want to print.
	 */
	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
	va_end(args);

	/* Send to desired file */
	fputs(file, printbuffer);
	return i;
}

/** U-Boot INITIAL CONSOLE-COMPATIBLE FUNCTION *****************************/

int getc(void)
{
#ifdef CONFIG_DISABLE_CONSOLE
	if (gd->flags & GD_FLG_DISABLE_CONSOLE)
		return 0;
#endif

	if (!gd->have_console)
		return 0;

#ifdef CONFIG_CONSOLE_RECORD
	if (gd->console_in.start) {
		int ch;

		ch = membuff_getbyte(&gd->console_in);
		if (ch != -1)
			return 1;
	}
#endif
	if (gd->flags & GD_FLG_DEVINIT) {
		/* Get from the standard input */
		return fgetc(stdin);
	}

	/* Send directly to the handler */
	return serial_getc();
}

int tstc(void)
{
#ifdef CONFIG_DISABLE_CONSOLE
	if (gd->flags & GD_FLG_DISABLE_CONSOLE)
		return 0;
#endif

	if (!gd->have_console)
		return 0;
#ifdef CONFIG_CONSOLE_RECORD
	if (gd->console_in.start) {
		if (membuff_peekbyte(&gd->console_in) != -1)
			return 1;
	}
#endif
	if (gd->flags & GD_FLG_DEVINIT) {
		/* Test the standard input */
		return ftstc(stdin);
	}

	/* Send directly to the handler */
	return serial_tstc();
}

#define PRE_CONSOLE_FLUSHPOINT1_SERIAL			0
#define PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL	1

#if CONFIG_IS_ENABLED(PRE_CONSOLE_BUFFER)
#define CIRC_BUF_IDX(idx) ((idx) % (unsigned long)CONFIG_PRE_CON_BUF_SZ)

static void pre_console_putc(const char c)
{
	char *buffer;

	buffer = map_sysmem(CONFIG_PRE_CON_BUF_ADDR, CONFIG_PRE_CON_BUF_SZ);

	buffer[CIRC_BUF_IDX(gd->precon_buf_idx++)] = c;

	unmap_sysmem(buffer);
}

static void pre_console_puts(const char *s)
{
	while (*s)
		pre_console_putc(*s++);
}

static void print_pre_console_buffer(int flushpoint)
{
	unsigned long in = 0, out = 0;
	char buf_out[CONFIG_PRE_CON_BUF_SZ + 1];
	char *buf_in;

	buf_in = map_sysmem(CONFIG_PRE_CON_BUF_ADDR, CONFIG_PRE_CON_BUF_SZ);
	if (gd->precon_buf_idx > CONFIG_PRE_CON_BUF_SZ)
		in = gd->precon_buf_idx - CONFIG_PRE_CON_BUF_SZ;

	while (in < gd->precon_buf_idx)
		buf_out[out++] = buf_in[CIRC_BUF_IDX(in++)];
	unmap_sysmem(buf_in);

	buf_out[out] = 0;

	switch (flushpoint) {
	case PRE_CONSOLE_FLUSHPOINT1_SERIAL:
		puts(buf_out);
		break;
	case PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL:
		console_puts_noserial(stdout, buf_out);
		break;
	}
}
#else
static inline void pre_console_putc(const char c) {}
static inline void pre_console_puts(const char *s) {}
static inline void print_pre_console_buffer(int flushpoint) {}
#endif

void putc(const char c)
{
#ifdef CONFIG_SANDBOX
	/* sandbox can send characters to stdout before it has a console */
	if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) {
		os_putc(c);
		return;
	}
#endif
#ifdef CONFIG_DEBUG_UART
	/* if we don't have a console yet, use the debug UART */
	if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) {
		printch(c);
		return;
	}
#endif
	if (!gd)
		return;
#ifdef CONFIG_CONSOLE_RECORD
	if ((gd->flags & GD_FLG_RECORD) && gd->console_out.start)
		membuff_putbyte(&gd->console_out, c);
#endif
#ifdef CONFIG_SILENT_CONSOLE
	if (gd->flags & GD_FLG_SILENT)
		return;
#endif

#ifdef CONFIG_DISABLE_CONSOLE
	if (gd->flags & GD_FLG_DISABLE_CONSOLE)
		return;
#endif

	if (!gd->have_console)
		return pre_console_putc(c);

	if (gd->flags & GD_FLG_DEVINIT) {
		/* Send to the standard output */
		fputc(stdout, c);
	} else {
		/* Send directly to the handler */
		pre_console_putc(c);
		serial_putc(c);
	}
}

void puts(const char *s)
{
#ifdef CONFIG_SANDBOX
	/* sandbox can send characters to stdout before it has a console */
	if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) {
		os_puts(s);
		return;
	}
#endif
#ifdef CONFIG_DEBUG_UART
	if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) {
		while (*s) {
			int ch = *s++;

			printch(ch);
		}
		return;
	}
#endif
	if (!gd)
		return;
#ifdef CONFIG_CONSOLE_RECORD
	if ((gd->flags & GD_FLG_RECORD) && gd->console_out.start)
		membuff_put(&gd->console_out, s, strlen(s));
#endif
#ifdef CONFIG_SILENT_CONSOLE
	if (gd->flags & GD_FLG_SILENT)
		return;
#endif

#ifdef CONFIG_DISABLE_CONSOLE
	if (gd->flags & GD_FLG_DISABLE_CONSOLE)
		return;
#endif

	if (!gd->have_console)
		return pre_console_puts(s);

	if (gd->flags & GD_FLG_DEVINIT) {
		/* Send to the standard output */
		fputs(stdout, s);
	} else {
		/* Send directly to the handler */
		pre_console_puts(s);
		serial_puts(s);
	}
}

#ifdef CONFIG_CONSOLE_RECORD
int console_record_init(void)
{
	int ret;

	ret = membuff_new(&gd->console_out, CONFIG_CONSOLE_RECORD_OUT_SIZE);
	if (ret)
		return ret;
	ret = membuff_new(&gd->console_in, CONFIG_CONSOLE_RECORD_IN_SIZE);

	return ret;
}

void console_record_reset(void)
{
	membuff_purge(&gd->console_out);
	membuff_purge(&gd->console_in);
}

void console_record_reset_enable(void)
{
	console_record_reset();
	gd->flags |= GD_FLG_RECORD;
}
#endif

/* test if ctrl-c was pressed */
static int ctrlc_disabled = 0;	/* see disable_ctrl() */
static int ctrlc_was_pressed = 0;
int ctrlc(void)
{
	if (!ctrlc_disabled && gd->have_console) {
		if (tstc()) {
			switch (getc()) {
			case 0x03:		/* ^C - Control C */
				ctrlc_was_pressed = 1;
				return 1;
			default:
				break;
			}
		}
	}

	return 0;
}
/* Reads user's confirmation.
   Returns 1 if user's input is "y", "Y", "yes" or "YES"
*/
int confirm_yesno(void)
{
	int i;
	char str_input[5];

	/* Flush input */
	while (tstc())
		getc();
	i = 0;
	while (i < sizeof(str_input)) {
		str_input[i] = getc();
		putc(str_input[i]);
		if (str_input[i] == '\r')
			break;
		i++;
	}
	putc('\n');
	if (strncmp(str_input, "y\r", 2) == 0 ||
	    strncmp(str_input, "Y\r", 2) == 0 ||
	    strncmp(str_input, "yes\r", 4) == 0 ||
	    strncmp(str_input, "YES\r", 4) == 0)
		return 1;
	return 0;
}
/* pass 1 to disable ctrlc() checking, 0 to enable.
 * returns previous state
 */
int disable_ctrlc(int disable)
{
	int prev = ctrlc_disabled;	/* save previous state */

	ctrlc_disabled = disable;
	return prev;
}

int had_ctrlc (void)
{
	return ctrlc_was_pressed;
}

void clear_ctrlc(void)
{
	ctrlc_was_pressed = 0;
}

/** U-Boot INIT FUNCTIONS *************************************************/

struct stdio_dev *search_device(int flags, const char *name)
{
	struct stdio_dev *dev;

	dev = stdio_get_by_name(name);
#ifdef CONFIG_VIDCONSOLE_AS_LCD
	if (!dev && !strcmp(name, "lcd"))
		dev = stdio_get_by_name("vidconsole");
#endif

	if (dev && (dev->flags & flags))
		return dev;

	return NULL;
}

int console_assign(int file, const char *devname)
{
	int flag;
	struct stdio_dev *dev;

	/* Check for valid file */
	switch (file) {
	case stdin:
		flag = DEV_FLAGS_INPUT;
		break;
	case stdout:
	case stderr:
		flag = DEV_FLAGS_OUTPUT;
		break;
	default:
		return -1;
	}

	/* Check for valid device name */

	dev = search_device(flag, devname);

	if (dev)
		return console_setfile(file, dev);

	return -1;
}

static void console_update_silent(void)
{
#ifdef CONFIG_SILENT_CONSOLE
	if (env_get("silent") != NULL)
		gd->flags |= GD_FLG_SILENT;
	else
		gd->flags &= ~GD_FLG_SILENT;
#endif
}

int console_announce_r(void)
{
#if !CONFIG_IS_ENABLED(PRE_CONSOLE_BUFFER)
	char buf[DISPLAY_OPTIONS_BANNER_LENGTH];

	display_options_get_banner(false, buf, sizeof(buf));

	console_puts_noserial(stdout, buf);
#endif

	return 0;
}

/* Called before relocation - use serial functions */
int console_init_f(void)
{
	gd->have_console = 1;

	console_update_silent();

	print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT1_SERIAL);

	return 0;
}

void stdio_print_current_devices(void)
{
	/* Print information */
	puts("In:    ");
	if (stdio_devices[stdin] == NULL) {
		puts("No input devices available!\n");
	} else {
		printf ("%s\n", stdio_devices[stdin]->name);
	}

	puts("Out:   ");
	if (stdio_devices[stdout] == NULL) {
		puts("No output devices available!\n");
	} else {
		printf ("%s\n", stdio_devices[stdout]->name);
	}

	puts("Err:   ");
	if (stdio_devices[stderr] == NULL) {
		puts("No error devices available!\n");
	} else {
		printf ("%s\n", stdio_devices[stderr]->name);
	}
}

#if CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV)
/* Called after the relocation - use desired console functions */
int console_init_r(void)
{
	char *stdinname, *stdoutname, *stderrname;
	struct stdio_dev *inputdev = NULL, *outputdev = NULL, *errdev = NULL;
#ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
	int i;
#endif /* CONFIG_SYS_CONSOLE_ENV_OVERWRITE */
#if CONFIG_IS_ENABLED(CONSOLE_MUX)
	int iomux_err = 0;
#endif

	/* set default handlers at first */
	gd->jt->getc  = serial_getc;
	gd->jt->tstc  = serial_tstc;
	gd->jt->putc  = serial_putc;
	gd->jt->puts  = serial_puts;
	gd->jt->printf = serial_printf;

	/* stdin stdout and stderr are in environment */
	/* scan for it */
	stdinname  = env_get("stdin");
	stdoutname = env_get("stdout");
	stderrname = env_get("stderr");

	if (OVERWRITE_CONSOLE == 0) {	/* if not overwritten by config switch */
		inputdev  = search_device(DEV_FLAGS_INPUT,  stdinname);
		outputdev = search_device(DEV_FLAGS_OUTPUT, stdoutname);
		errdev    = search_device(DEV_FLAGS_OUTPUT, stderrname);
#if CONFIG_IS_ENABLED(CONSOLE_MUX)
		iomux_err = iomux_doenv(stdin, stdinname);
		iomux_err += iomux_doenv(stdout, stdoutname);
		iomux_err += iomux_doenv(stderr, stderrname);
		if (!iomux_err)
			/* Successful, so skip all the code below. */
			goto done;
#endif
	}
	/* if the devices are overwritten or not found, use default device */
	if (inputdev == NULL) {
		inputdev  = search_device(DEV_FLAGS_INPUT,  "serial");
	}
	if (outputdev == NULL) {
		outputdev = search_device(DEV_FLAGS_OUTPUT, "serial");
	}
	if (errdev == NULL) {
		errdev    = search_device(DEV_FLAGS_OUTPUT, "serial");
	}
	/* Initializes output console first */
	if (outputdev != NULL) {
		/* need to set a console if not done above. */
		console_doenv(stdout, outputdev);
	}
	if (errdev != NULL) {
		/* need to set a console if not done above. */
		console_doenv(stderr, errdev);
	}
	if (inputdev != NULL) {
		/* need to set a console if not done above. */
		console_doenv(stdin, inputdev);
	}

#if CONFIG_IS_ENABLED(CONSOLE_MUX)
done:
#endif

#ifndef CONFIG_SYS_CONSOLE_INFO_QUIET
	stdio_print_current_devices();
#endif /* CONFIG_SYS_CONSOLE_INFO_QUIET */
#ifdef CONFIG_VIDCONSOLE_AS_LCD
	if (strstr(stdoutname, "lcd"))
		printf("Warning: Please change 'lcd' to 'vidconsole' in stdout/stderr environment vars\n");
#endif

#ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
	/* set the environment variables (will overwrite previous env settings) */
	for (i = 0; i < MAX_FILES; i++) {
		env_set(stdio_names[i], stdio_devices[i]->name);
	}
#endif /* CONFIG_SYS_CONSOLE_ENV_OVERWRITE */

	gd->flags |= GD_FLG_DEVINIT;	/* device initialization completed */

#if 0
	/* If nothing usable installed, use only the initial console */
	if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
		return 0;
#endif
	print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL);
	return 0;
}

#else /* !CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV) */

/* Called after the relocation - use desired console functions */
int console_init_r(void)
{
	struct stdio_dev *inputdev = NULL, *outputdev = NULL;
	int i;
	struct list_head *list = stdio_get_list();
	struct list_head *pos;
	struct stdio_dev *dev;

	console_update_silent();

#ifdef CONFIG_SPLASH_SCREEN
	/*
	 * suppress all output if splash screen is enabled and we have
	 * a bmp to display. We redirect the output from frame buffer
	 * console to serial console in this case or suppress it if
	 * "silent" mode was requested.
	 */
	if (env_get("splashimage") != NULL) {
		if (!(gd->flags & GD_FLG_SILENT))
			outputdev = search_device (DEV_FLAGS_OUTPUT, "serial");
	}
#endif

	/* Scan devices looking for input and output devices */
	list_for_each(pos, list) {
		dev = list_entry(pos, struct stdio_dev, list);

		if ((dev->flags & DEV_FLAGS_INPUT) && (inputdev == NULL)) {
			inputdev = dev;
		}
		if ((dev->flags & DEV_FLAGS_OUTPUT) && (outputdev == NULL)) {
			outputdev = dev;
		}
		if(inputdev && outputdev)
			break;
	}

	/* Initializes output console first */
	if (outputdev != NULL) {
		console_setfile(stdout, outputdev);
		console_setfile(stderr, outputdev);
#if CONFIG_IS_ENABLED(CONSOLE_MUX)
		console_devices[stdout][0] = outputdev;
		console_devices[stderr][0] = outputdev;
#endif
	}

	/* Initializes input console */
	if (inputdev != NULL) {
		console_setfile(stdin, inputdev);
#if CONFIG_IS_ENABLED(CONSOLE_MUX)
		console_devices[stdin][0] = inputdev;
#endif
	}

#ifndef CONFIG_SYS_CONSOLE_INFO_QUIET
	stdio_print_current_devices();
#endif /* CONFIG_SYS_CONSOLE_INFO_QUIET */

	/* Setting environment variables */
	for (i = 0; i < MAX_FILES; i++) {
		env_set(stdio_names[i], stdio_devices[i]->name);
	}

	gd->flags |= GD_FLG_DEVINIT;	/* device initialization completed */

#if 0
	/* If nothing usable installed, use only the initial console */
	if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
		return 0;
#endif
	print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL);
	return 0;
}

#endif /* CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV) */