aboutsummaryrefslogtreecommitdiff
path: root/arch/m68k/lib/board.c
blob: c29f5775bb5926e4cc7ebd5368432069b39976dd (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
/*
 * (C) Copyright 2003
 * Josef Baumgartner <josef.baumgartner@telex.de>
 *
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <malloc.h>
#include <stdio_dev.h>

#include <asm/immap.h>

#if defined(CONFIG_CMD_IDE)
#include <ide.h>
#endif
#if defined(CONFIG_CMD_SCSI)
#include <scsi.h>
#endif
#if defined(CONFIG_CMD_KGDB)
#include <kgdb.h>
#endif
#ifdef CONFIG_STATUS_LED
#include <status_led.h>
#endif
#include <net.h>
#include <serial.h>
#if defined(CONFIG_CMD_BEDBUG)
#include <cmd_bedbug.h>
#endif
#ifdef CONFIG_SYS_ALLOC_DPRAM
#include <commproc.h>
#endif
#include <version.h>

#if defined(CONFIG_HARD_I2C) || \
    defined(CONFIG_SOFT_I2C)
#include <i2c.h>
#endif

#ifdef CONFIG_CMD_SPI
#include <spi.h>
#endif

#ifdef CONFIG_BITBANGMII
#include <miiphy.h>
#endif

#include <nand.h>

DECLARE_GLOBAL_DATA_PTR;

static char *failed = "*** failed ***\n";

#ifdef	CONFIG_PCU_E
extern flash_info_t flash_info[];
#endif

#include <environment.h>

extern ulong __init_end;
extern ulong _end;

extern	void timer_init(void);

#if defined(CONFIG_WATCHDOG)
# define INIT_FUNC_WATCHDOG_INIT	watchdog_init,
# define WATCHDOG_DISABLE		watchdog_disable

extern int watchdog_init(void);
extern int watchdog_disable(void);
#else
# define INIT_FUNC_WATCHDOG_INIT	/* undef */
# define WATCHDOG_DISABLE		/* undef */
#endif /* CONFIG_WATCHDOG */

ulong monitor_flash_len;

/************************************************************************
 * Utilities								*
 ************************************************************************
 */

/*
 * All attempts to come up with a "common" initialization sequence
 * that works for all boards and architectures failed: some of the
 * requirements are just _too_ different. To get rid of the resulting
 * mess of board dependend #ifdef'ed code we now make the whole
 * initialization sequence configurable to the user.
 *
 * The requirements for any new initalization function is simple: it
 * receives a pointer to the "global data" structure as it's only
 * argument, and returns an integer return code, where 0 means
 * "continue" and != 0 means "fatal error, hang the system".
 */
typedef int (init_fnc_t) (void);

/************************************************************************
 * Init Utilities
 ************************************************************************
 * Some of this code should be moved into the core functions,
 * but let's get it working (again) first...
 */

static int init_baudrate (void)
{
	char tmp[64];	/* long enough for environment variables */
	int i = getenv_f("baudrate", tmp, sizeof (tmp));

	gd->baudrate = (i > 0)
			? (int) simple_strtoul (tmp, NULL, 10)
			: CONFIG_BAUDRATE;
	return (0);
}

/***********************************************************************/

static int init_func_ram (void)
{
	int board_type = 0;	/* use dummy arg */
	puts ("DRAM:  ");

	if ((gd->ram_size = initdram (board_type)) > 0) {
		print_size (gd->ram_size, "\n");
		return (0);
	}
	puts (failed);
	return (1);
}

/***********************************************************************/

#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
static int init_func_i2c (void)
{
	puts ("I2C:   ");
	i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
	puts ("ready\n");
	return (0);
}
#endif

#if defined(CONFIG_HARD_SPI)
static int init_func_spi (void)
{
	puts ("SPI:   ");
	spi_init ();
	puts ("ready\n");
	return (0);
}
#endif

/***********************************************************************/

/************************************************************************
 * Initialization sequence						*
 ************************************************************************
 */

init_fnc_t *init_sequence[] = {
	get_clocks,
	env_init,
	init_baudrate,
	serial_init,
	console_init_f,
	display_options,
	checkcpu,
	checkboard,
#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
	init_func_i2c,
#endif
#if defined(CONFIG_HARD_SPI)
	init_func_spi,
#endif
	init_func_ram,
#if defined(CONFIG_SYS_DRAM_TEST)
	testdram,
#endif /* CONFIG_SYS_DRAM_TEST */
	INIT_FUNC_WATCHDOG_INIT
	NULL,			/* Terminate this list */
};


/************************************************************************
 *
 * This is the first part of the initialization sequence that is
 * implemented in C, but still running from ROM.
 *
 * The main purpose is to provide a (serial) console interface as
 * soon as possible (so we can see any error messages), and to
 * initialize the RAM so that we can relocate the monitor code to
 * RAM.
 *
 * Be aware of the restrictions: global data is read-only, BSS is not
 * initialized, and stack space is limited to a few kB.
 *
 ************************************************************************
 */

void
board_init_f (ulong bootflag)
{
	bd_t *bd;
	ulong len, addr, addr_sp;
	ulong *paddr;
	gd_t *id;
	init_fnc_t **init_fnc_ptr;
#ifdef CONFIG_PRAM
	int i;
	ulong reg;
	char tmp[64];		/* long enough for environment variables */
#endif

	/* Pointer is writable since we allocated a register for it */
	gd = (gd_t *) (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
	/* compiler optimization barrier needed for GCC >= 3.4 */
	__asm__ __volatile__("": : :"memory");

	/* Clear initial global data */
	memset ((void *) gd, 0, sizeof (gd_t));

	for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
		if ((*init_fnc_ptr)() != 0) {
			hang ();
		}
	}

	/*
	 * Now that we have DRAM mapped and working, we can
	 * relocate the code and continue running from DRAM.
	 *
	 * Reserve memory at end of RAM for (top down in that order):
	 *	- protected RAM
	 *	- LCD framebuffer
	 *	- monitor code
	 *	- board info struct
	 */
	len = (ulong)&_end - CONFIG_SYS_MONITOR_BASE;

	addr = CONFIG_SYS_SDRAM_BASE + gd->ram_size;

#ifdef CONFIG_LOGBUFFER
	/* reserve kernel log buffer */
	addr -= (LOGBUFF_RESERVE);
	debug ("Reserving %dk for kernel logbuffer at %08lx\n", LOGBUFF_LEN, addr);
#endif

#ifdef CONFIG_PRAM
	/*
	 * reserve protected RAM
	 */
	i = getenv_f("pram", tmp, sizeof (tmp));
	reg = (i > 0) ? simple_strtoul (tmp, NULL, 10) : CONFIG_PRAM;
	addr -= (reg << 10);		/* size is in kB */
	debug ("Reserving %ldk for protected RAM at %08lx\n", reg, addr);
#endif /* CONFIG_PRAM */

	/* round down to next 4 kB limit */
	addr &= ~(4096 - 1);
	debug ("Top of RAM usable for U-Boot at: %08lx\n", addr);

#ifdef CONFIG_LCD
	/* reserve memory for LCD display (always full pages) */
	addr = lcd_setmem (addr);
	gd->fb_base = addr;
#endif /* CONFIG_LCD */

	/*
	 * reserve memory for U-Boot code, data & bss
	 * round down to next 4 kB limit
	 */
	addr -= len;
	addr &= ~(4096 - 1);

	debug ("Reserving %ldk for U-Boot at: %08lx\n", len >> 10, addr);

	/*
	 * reserve memory for malloc() arena
	 */
	addr_sp = addr - TOTAL_MALLOC_LEN;
	debug ("Reserving %dk for malloc() at: %08lx\n",
			TOTAL_MALLOC_LEN >> 10, addr_sp);

	/*
	 * (permanently) allocate a Board Info struct
	 * and a permanent copy of the "global" data
	 */
	addr_sp -= sizeof (bd_t);
	bd = (bd_t *) addr_sp;
	gd->bd = bd;
	debug ("Reserving %zu Bytes for Board Info at: %08lx\n",
			sizeof (bd_t), addr_sp);
	addr_sp -= sizeof (gd_t);
	id = (gd_t *) addr_sp;
	debug ("Reserving %zu Bytes for Global Data at: %08lx\n",
			sizeof (gd_t), addr_sp);

	/* Reserve memory for boot params. */
	addr_sp -= CONFIG_SYS_BOOTPARAMS_LEN;
	bd->bi_boot_params = addr_sp;
	debug ("Reserving %dk for boot parameters at: %08lx\n",
			CONFIG_SYS_BOOTPARAMS_LEN >> 10, addr_sp);

	/*
	 * Finally, we set up a new (bigger) stack.
	 *
	 * Leave some safety gap for SP, force alignment on 16 byte boundary
	 * Clear initial stack frame
	 */
	addr_sp -= 16;
	addr_sp &= ~0xF;

	paddr = (ulong *)addr_sp;
	*paddr-- = 0;
	*paddr-- = 0;
	addr_sp = (ulong)paddr;

	debug ("Stack Pointer at: %08lx\n", addr_sp);

	/*
	 * Save local variables to board info struct
	 */
	bd->bi_memstart  = CONFIG_SYS_SDRAM_BASE;	/* start of  DRAM memory      */
	bd->bi_memsize   = gd->ram_size;	/* size  of  DRAM memory in bytes */
#ifdef CONFIG_SYS_INIT_RAM_ADDR
	bd->bi_sramstart = CONFIG_SYS_INIT_RAM_ADDR;	/* start of  SRAM memory	*/
	bd->bi_sramsize  = CONFIG_SYS_INIT_RAM_END;	/* size  of  SRAM memory	*/
#endif
	bd->bi_mbar_base = CONFIG_SYS_MBAR;		/* base of internal registers */

	bd->bi_bootflags = bootflag;		/* boot / reboot flag (for LynxOS)    */

	WATCHDOG_RESET ();
	bd->bi_intfreq = gd->cpu_clk;	/* Internal Freq, in Hz */
	bd->bi_busfreq = gd->bus_clk;	/* Bus Freq,      in Hz */
#ifdef CONFIG_PCI
	bd->bi_pcifreq = gd->pci_clk;		/* PCI Freq in Hz */
#endif
#ifdef CONFIG_EXTRA_CLOCK
	bd->bi_inpfreq = gd->inp_clk;		/* input Freq in Hz */
	bd->bi_vcofreq = gd->vco_clk;		/* vco Freq in Hz */
	bd->bi_flbfreq = gd->flb_clk;		/* flexbus Freq in Hz */
#endif
	bd->bi_baudrate = gd->baudrate;	/* Console Baudrate     */

#ifdef CONFIG_SYS_EXTBDINFO
	strncpy (bd->bi_s_version, "1.2", sizeof (bd->bi_s_version));
	strncpy (bd->bi_r_version, U_BOOT_VERSION, sizeof (bd->bi_r_version));
#endif

	WATCHDOG_RESET ();

#ifdef CONFIG_POST
	post_bootmode_init();
	post_run (NULL, POST_ROM | post_bootmode_get(0));
#endif

	WATCHDOG_RESET();

	memcpy (id, (void *)gd, sizeof (gd_t));

	debug ("Start relocate of code from %08x to %08lx\n", CONFIG_SYS_MONITOR_BASE, addr);
	relocate_code (addr_sp, id, addr);

	/* NOTREACHED - jump_to_ram() does not return */
}

/************************************************************************
 *
 * This is the next part if the initialization sequence: we are now
 * running from RAM and have a "normal" C environment, i. e. global
 * data can be written, BSS has been cleared, the stack size in not
 * that critical any more, etc.
 *
 ************************************************************************
 */
void board_init_r (gd_t *id, ulong dest_addr)
{
	cmd_tbl_t *cmdtp;
	char *s;
	bd_t *bd;
	extern void malloc_bin_reloc (void);

#ifndef CONFIG_ENV_IS_NOWHERE
	extern char * env_name_spec;
#endif
#ifndef CONFIG_SYS_NO_FLASH
	ulong flash_size;
#endif
	gd = id;		/* initialize RAM version of global data */
	bd = gd->bd;

	gd->flags |= GD_FLG_RELOC;	/* tell others: relocation done */

#ifdef CONFIG_SERIAL_MULTI
	serial_initialize();
#endif

	debug ("Now running in RAM - U-Boot at: %08lx\n", dest_addr);

	WATCHDOG_RESET ();

	gd->reloc_off =  dest_addr - CONFIG_SYS_MONITOR_BASE;

	monitor_flash_len = (ulong)&__init_end - dest_addr;

#if !defined(CONFIG_RELOC_FIXUP_WORKS)
	/*
	 * We have to relocate the command table manually
	 */
	fixup_cmdtable(&__u_boot_cmd_start,
		(ulong)(&__u_boot_cmd_end - &__u_boot_cmd_start));
#endif /* !defined(CONFIG_RELOC_FIXUP_WORKS) */

	/* there are some other pointer constants we must deal with */
#ifndef CONFIG_ENV_IS_NOWHERE
	env_name_spec += gd->reloc_off;
#endif

	WATCHDOG_RESET ();

#ifdef CONFIG_LOGBUFFER
	logbuff_init_ptrs ();
#endif
#ifdef CONFIG_POST
	post_output_backlog ();
	post_reloc ();
#endif
	WATCHDOG_RESET();

#if 0
	/* instruction cache enabled in cpu_init_f() for faster relocation */
	icache_enable ();	/* it's time to enable the instruction cache */
#endif

	/*
	 * Setup trap handlers
	 */
	trap_init (CONFIG_SYS_SDRAM_BASE);

	/* The Malloc area is immediately below the monitor copy in DRAM */
	mem_malloc_init (CONFIG_SYS_MONITOR_BASE + gd->reloc_off -
			TOTAL_MALLOC_LEN, TOTAL_MALLOC_LEN);
	malloc_bin_reloc ();

#if !defined(CONFIG_SYS_NO_FLASH)
	puts ("FLASH: ");

	if ((flash_size = flash_init ()) > 0) {
# ifdef CONFIG_SYS_FLASH_CHECKSUM
		print_size (flash_size, "");
		/*
		 * Compute and print flash CRC if flashchecksum is set to 'y'
		 *
		 * NOTE: Maybe we should add some WATCHDOG_RESET()? XXX
		 */
		s = getenv ("flashchecksum");
		if (s && (*s == 'y')) {
			printf ("  CRC: %08X",
					crc32 (0,
						   (const unsigned char *) CONFIG_SYS_FLASH_BASE,
						   flash_size)
					);
		}
		putc ('\n');
# else	/* !CONFIG_SYS_FLASH_CHECKSUM */
		print_size (flash_size, "\n");
# endif /* CONFIG_SYS_FLASH_CHECKSUM */
	} else {
		puts (failed);
		hang ();
	}

	bd->bi_flashstart = CONFIG_SYS_FLASH_BASE;	/* update start of FLASH memory    */
	bd->bi_flashsize = flash_size;	/* size of FLASH memory (final value) */
	bd->bi_flashoffset = 0;
#else	/* CONFIG_SYS_NO_FLASH */
	bd->bi_flashsize = 0;
	bd->bi_flashstart = 0;
	bd->bi_flashoffset = 0;
#endif /* !CONFIG_SYS_NO_FLASH */

	WATCHDOG_RESET ();

	/* initialize higher level parts of CPU like time base and timers */
	cpu_init_r ();

	WATCHDOG_RESET ();

#ifdef CONFIG_SPI
# if !defined(CONFIG_ENV_IS_IN_EEPROM)
	spi_init_f ();
# endif
	spi_init_r ();
#endif

	/* relocate environment function pointers etc. */
	env_relocate ();

	/*
	 * Fill in missing fields of bd_info.
	 * We do this here, where we have "normal" access to the
	 * environment; we used to do this still running from ROM,
	 * where had to use getenv_f(), which can be pretty slow when
	 * the environment is in EEPROM.
	 */
	bd->bi_ip_addr = getenv_IPaddr ("ipaddr");

	WATCHDOG_RESET ();

#if defined(CONFIG_PCI)
	/*
	 * Do pci configuration
	 */
	pci_init ();
#endif

	/** leave this here (after malloc(), environment and PCI are working) **/
	/* Initialize stdio devices */
	stdio_init ();

	/* Initialize the jump table for applications */
	jumptable_init ();

	/* Initialize the console (after the relocation and devices init) */
	console_init_r ();

#if defined(CONFIG_MISC_INIT_R)
	/* miscellaneous platform dependent initialisations */
	misc_init_r ();
#endif

#if defined(CONFIG_CMD_KGDB)
	WATCHDOG_RESET ();
	puts ("KGDB:  ");
	kgdb_init ();
#endif

	debug ("U-Boot relocated to %08lx\n", dest_addr);

	/*
	 * Enable Interrupts
	 */
	interrupt_init ();

	/* Must happen after interrupts are initialized since
	 * an irq handler gets installed
	 */
	timer_init();

#ifdef CONFIG_STATUS_LED
	status_led_set (STATUS_LED_BOOT, STATUS_LED_BLINKING);
#endif

	udelay (20);

	set_timer (0);

	/* Insert function pointers now that we have relocated the code */

	/* Initialize from environment */
	if ((s = getenv ("loadaddr")) != NULL) {
		load_addr = simple_strtoul (s, NULL, 16);
	}
#if defined(CONFIG_CMD_NET)
	if ((s = getenv ("bootfile")) != NULL) {
		copy_filename (BootFile, s, sizeof (BootFile));
	}
#endif

	WATCHDOG_RESET ();

#if defined(CONFIG_CMD_DOC)
	WATCHDOG_RESET ();
	puts ("DOC:   ");
	doc_init ();
#endif

#if defined(CONFIG_CMD_NAND)
	WATCHDOG_RESET ();
	puts ("NAND:  ");
	nand_init();		/* go init the NAND */
#endif

#ifdef CONFIG_BITBANGMII
	bb_miiphy_init();
#endif
#if defined(CONFIG_CMD_NET)
	WATCHDOG_RESET();
#if defined(FEC_ENET)
	eth_init(bd);
#endif
#if defined(CONFIG_NET_MULTI)
	puts ("Net:   ");
	eth_initialize (bd);
#endif
#endif

#ifdef CONFIG_POST
	post_run (NULL, POST_RAM | post_bootmode_get(0));
#endif

#if defined(CONFIG_CMD_PCMCIA) \
    && !defined(CONFIG_CMD_IDE)
	WATCHDOG_RESET ();
	puts ("PCMCIA:");
	pcmcia_init ();
#endif

#if defined(CONFIG_CMD_IDE)
	WATCHDOG_RESET ();
	puts ("IDE:   ");
	ide_init ();
#endif

#ifdef CONFIG_LAST_STAGE_INIT
	WATCHDOG_RESET ();
	/*
	 * Some parts can be only initialized if all others (like
	 * Interrupts) are up and running (i.e. the PC-style ISA
	 * keyboard).
	 */
	last_stage_init ();
#endif

#if defined(CONFIG_CMD_BEDBUG)
	WATCHDOG_RESET ();
	bedbug_init ();
#endif

#if defined(CONFIG_PRAM) || defined(CONFIG_LOGBUFFER)
	/*
	 * Export available size of memory for Linux,
	 * taking into account the protected RAM at top of memory
	 */
	{
		ulong pram;
		char memsz[32];
#ifdef CONFIG_PRAM
		char *s;

		if ((s = getenv ("pram")) != NULL) {
			pram = simple_strtoul (s, NULL, 10);
		} else {
			pram = CONFIG_PRAM;
		}
#else
		pram=0;
#endif
#ifdef CONFIG_LOGBUFFER
		/* Also take the logbuffer into account (pram is in kB) */
		pram += (LOGBUFF_LEN+LOGBUFF_OVERHEAD)/1024;
#endif
		sprintf (memsz, "%ldk", (bd->bi_memsize / 1024) - pram);
		setenv ("mem", memsz);
	}
#endif

#ifdef CONFIG_MODEM_SUPPORT
 {
	 extern int do_mdm_init;
	 do_mdm_init = gd->do_mdm_init;
 }
#endif

#ifdef CONFIG_WATCHDOG
	/* disable watchdog if environment is set */
	if ((s = getenv ("watchdog")) != NULL) {
		if (strncmp (s, "off", 3) == 0) {
			WATCHDOG_DISABLE ();
		}
	}
#endif /* CONFIG_WATCHDOG*/


	/* Initialization complete - start the monitor */

	/* main_loop() can return to retry autoboot, if so just run it again. */
	for (;;) {
		WATCHDOG_RESET ();
		main_loop ();
	}

	/* NOTREACHED - no way out of command loop except booting */
}


void hang(void)
{
	puts ("### ERROR ### Please RESET the board ###\n");
	for (;;);
}