summaryrefslogtreecommitdiff
path: root/arch/blackfin/mach-bf533/head.S
blob: 7dd0e9c3a936402e4e9470677114b8155eababbe (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
/*
 * File:         arch/blackfin/mach-bf533/head.S
 * Based on:
 * Author:       Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne
 *
 * Created:      1998
 * Description:  bf533 startup file
 *
 * Modified:
 *               Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/blackfin.h>
#include <asm/trace.h>
#if CONFIG_BFIN_KERNEL_CLOCK
#include <asm/mach/mem_init.h>
#endif
#if CONFIG_DEBUG_KERNEL_START
#include <asm/mach-common/def_LPBlackfin.h>
#endif

.global __rambase
.global __ramstart
.global __ramend
.extern ___bss_stop
.extern ___bss_start
.extern _bf53x_relocate_l1_mem

#define INITIAL_STACK	0xFFB01000

__INIT

ENTRY(__start)
	/* R0: argument of command line string, passed from uboot, save it */
	R7 = R0;
	/* Set the SYSCFG register:
	 * Enable Cycle Counter and Nesting Of Interrupts (3rd Bit)
	 */
	R0 = 0x36;
	SYSCFG = R0;
	R0 = 0;

	/* Clear Out All the data and pointer Registers */
	R1 = R0;
	R2 = R0;
	R3 = R0;
	R4 = R0;
	R5 = R0;
	R6 = R0;

	P0 = R0;
	P1 = R0;
	P2 = R0;
	P3 = R0;
	P4 = R0;
	P5 = R0;

	LC0 = r0;
	LC1 = r0;
	L0 = r0;
	L1 = r0;
	L2 = r0;
	L3 = r0;

	/* Clear Out All the DAG Registers */
	B0 = r0;
	B1 = r0;
	B2 = r0;
	B3 = r0;

	I0 = r0;
	I1 = r0;
	I2 = r0;
	I3 = r0;

	M0 = r0;
	M1 = r0;
	M2 = r0;
	M3 = r0;

	trace_buffer_start(p0,r0);
	P0 = R1;
	R0 = R1;

#if CONFIG_DEBUG_KERNEL_START

/*
 * Set up a temporary Event Vector Table, so if something bad happens before
 * the kernel is fully started, it doesn't vector off into the bootloaders
 * table
 */
	P0.l = lo(EVT2);
	P0.h = hi(EVT2);
	P1.l = lo(EVT15);
	P1.h = hi(EVT15);
	P2.l = debug_kernel_start_trap;
	P2.h = debug_kernel_start_trap;

	RTS = P2;
	RTI = P2;
	RTX = P2;
	RTN = P2;
	RTE = P2;

.Lfill_temp_vector_table:
	[P0++] = P2;	/* Core Event Vector Table */
	CC = P0 == P1;
	if !CC JUMP .Lfill_temp_vector_table
	P0 = r0;
	P1 = r0;
	P2 = r0;

#endif

	p0.h = hi(FIO_MASKA_C);
	p0.l = lo(FIO_MASKA_C);
	r0 = 0xFFFF(Z);
	w[p0] = r0.L;	/* Disable all interrupts */
	ssync;

	p0.h = hi(FIO_MASKB_C);
	p0.l = lo(FIO_MASKB_C);
	r0 = 0xFFFF(Z);
	w[p0] = r0.L;	/* Disable all interrupts */
	ssync;

	/* Turn off the icache */
	p0.l = (IMEM_CONTROL & 0xFFFF);
	p0.h = (IMEM_CONTROL >> 16);
	R1 = [p0];
	R0 = ~ENICPLB;
	R0 = R0 & R1;

	/* Anomaly 05000125 */
#ifdef ANOMALY_05000125
	CLI R2;
	SSYNC;
#endif
	[p0] = R0;
	SSYNC;
#ifdef ANOMALY_05000125
	STI R2;
#endif

	/* Turn off the dcache */
	p0.l = (DMEM_CONTROL & 0xFFFF);
	p0.h = (DMEM_CONTROL >> 16);
	R1 = [p0];
	R0 = ~ENDCPLB;
	R0 = R0 & R1;

	/* Anomaly 05000125 */
#ifdef ANOMALY_05000125
	CLI R2;
	SSYNC;
#endif
	[p0] = R0;
	SSYNC;
#ifdef ANOMALY_05000125
	STI R2;
#endif

	/* Initialise UART - when booting from u-boot, the UART is not disabled
	 * so if we dont initalize here, our serial console gets hosed */
	p0.h = hi(UART_LCR);
	p0.l = lo(UART_LCR);
	r0 = 0x0(Z);
	w[p0] = r0.L;	/* To enable DLL writes */
	ssync;

	p0.h = hi(UART_DLL);
	p0.l = lo(UART_DLL);
	r0 = 0x0(Z);
	w[p0] = r0.L;
	ssync;

	p0.h = hi(UART_DLH);
	p0.l = lo(UART_DLH);
	r0 = 0x00(Z);
	w[p0] = r0.L;
	ssync;

	p0.h = hi(UART_GCTL);
	p0.l = lo(UART_GCTL);
	r0 = 0x0(Z);
	w[p0] = r0.L;	/* To enable UART clock */
	ssync;

	/* Initialize stack pointer */
	sp.l = lo(INITIAL_STACK);
	sp.h = hi(INITIAL_STACK);
	fp = sp;
	usp = sp;

	/* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
	call _bf53x_relocate_l1_mem;
#if CONFIG_BFIN_KERNEL_CLOCK
	call _start_dma_code;
#endif

	/* Code for initializing Async memory banks */

	p2.h = hi(EBIU_AMBCTL1);
	p2.l = lo(EBIU_AMBCTL1);
	r0.h = hi(AMBCTL1VAL);
	r0.l = lo(AMBCTL1VAL);
	[p2] = r0;
	ssync;

	p2.h = hi(EBIU_AMBCTL0);
	p2.l = lo(EBIU_AMBCTL0);
	r0.h = hi(AMBCTL0VAL);
	r0.l = lo(AMBCTL0VAL);
	[p2] = r0;
	ssync;

	p2.h = hi(EBIU_AMGCTL);
	p2.l = lo(EBIU_AMGCTL);
	r0 = AMGCTLVAL;
	w[p2] = r0;
	ssync;

	/* This section keeps the processor in supervisor mode
	 * during kernel boot.  Switches to user mode at end of boot.
	 * See page 3-9 of Hardware Reference manual for documentation.
	 */

	/* EVT15 = _real_start */

	p0.l = lo(EVT15);
	p0.h = hi(EVT15);
	p1.l = _real_start;
	p1.h = _real_start;
	[p0] = p1;
	csync;

	p0.l = lo(IMASK);
	p0.h = hi(IMASK);
	p1.l = IMASK_IVG15;
	p1.h = 0x0;
	[p0] = p1;
	csync;

	raise 15;
	p0.l = .LWAIT_HERE;
	p0.h = .LWAIT_HERE;
	reti = p0;
#if defined(ANOMALY_05000281)
	nop; nop; nop;
#endif
	rti;

.LWAIT_HERE:
	jump .LWAIT_HERE;
ENDPROC(__start)

ENTRY(_real_start)
	[ -- sp ] = reti;
	p0.l = lo(WDOG_CTL);
	p0.h = hi(WDOG_CTL);
	r0 = 0xAD6(z);
	w[p0] = r0;	/* watchdog off for now */
	ssync;

	/* Code update for BSS size == 0
	 * Zero out the bss region.
	 */

	p1.l = ___bss_start;
	p1.h = ___bss_start;
	p2.l = ___bss_stop;
	p2.h = ___bss_stop;
	r0 = 0;
	p2 -= p1;
	lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
.L_clear_bss:
	B[p1++] = r0;

	/* In case there is a NULL pointer reference
	 * Zero out region before stext
	 */

	p1.l = 0x0;
	p1.h = 0x0;
	r0.l = __stext;
	r0.h = __stext;
	r0 = r0 >> 1;
	p2 = r0;
	r0 = 0;
	lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
.L_clear_zero:
	W[p1++] = r0;

	/* pass the uboot arguments to the global value command line */
	R0 = R7;
	call _cmdline_init;

	p1.l = __rambase;
	p1.h = __rambase;
	r0.l = __sdata;
	r0.h = __sdata;
	[p1] = r0;

	p1.l = __ramstart;
	p1.h = __ramstart;
	p3.l = ___bss_stop;
	p3.h = ___bss_stop;

	r1 = p3;
	[p1] = r1;

	/*
	 * load the current thread pointer and stack
	 */
	r1.l = _init_thread_union;
	r1.h = _init_thread_union;

	r2.l = 0x2000;
	r2.h = 0x0000;
	r1 = r1 + r2;
	sp = r1;
	usp = sp;
	fp = sp;
	jump.l _start_kernel;
ENDPROC(_real_start)

__FINIT

.section .l1.text
#if CONFIG_BFIN_KERNEL_CLOCK
ENTRY(_start_dma_code)
	p0.h = hi(SIC_IWR);
	p0.l = lo(SIC_IWR);
	r0.l = 0x1;
	r0.h = 0x0;
	[p0] = r0;
	SSYNC;

	/*
	 *  Set PLL_CTL
	 *   - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
	 *   - [8]     = BYPASS    : BYPASS the PLL, run CLKIN into CCLK/SCLK
	 *   - [7]     = output delay (add 200ps of delay to mem signals)
	 *   - [6]     = input delay (add 200ps of input delay to mem signals)
	 *   - [5]     = PDWN      : 1=All Clocks off
	 *   - [3]     = STOPCK    : 1=Core Clock off
	 *   - [1]     = PLL_OFF   : 1=Disable Power to PLL
	 *   - [0]     = DF        : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
	 *   all other bits set to zero
	 */

	p0.h = hi(PLL_LOCKCNT);
	p0.l = lo(PLL_LOCKCNT);
	r0 = 0x300(Z);
	w[p0] = r0.l;
	ssync;

	P2.H = hi(EBIU_SDGCTL);
	P2.L = lo(EBIU_SDGCTL);
	R0 = [P2];
	BITSET (R0, 24);
	[P2] = R0;
	SSYNC;

	r0 = CONFIG_VCO_MULT & 63;       /* Load the VCO multiplier         */
	r0 = r0 << 9;                    /* Shift it over,                  */
	r1 = CLKIN_HALF;                 /* Do we need to divide CLKIN by 2?*/
	r0 = r1 | r0;
	r1 = PLL_BYPASS;                 /* Bypass the PLL?                 */
	r1 = r1 << 8;                    /* Shift it over                   */
	r0 = r1 | r0;                    /* add them all together           */

	p0.h = hi(PLL_CTL);
	p0.l = lo(PLL_CTL);              /* Load the address                */
	cli r2;                          /* Disable interrupts              */
	ssync;
	w[p0] = r0.l;                    /* Set the value                   */
	idle;                            /* Wait for the PLL to stablize    */
	sti r2;                          /* Enable interrupts               */

.Lcheck_again:
	p0.h = hi(PLL_STAT);
	p0.l = lo(PLL_STAT);
	R0 = W[P0](Z);
	CC = BITTST(R0,5);
	if ! CC jump .Lcheck_again;

	/* Configure SCLK & CCLK Dividers */
	r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
	p0.h = hi(PLL_DIV);
	p0.l = lo(PLL_DIV);
	w[p0] = r0.l;
	ssync;

	p0.l = lo(EBIU_SDRRC);
	p0.h = hi(EBIU_SDRRC);
	r0 = mem_SDRRC;
	w[p0] = r0.l;
	ssync;

	p0.l = (EBIU_SDBCTL & 0xFFFF);
	p0.h = (EBIU_SDBCTL >> 16);     /* SDRAM Memory Bank Control Register */
	r0 = mem_SDBCTL;
	w[p0] = r0.l;
	ssync;

	P2.H = hi(EBIU_SDGCTL);
	P2.L = lo(EBIU_SDGCTL);
	R0 = [P2];
	BITCLR (R0, 24);
	p0.h = hi(EBIU_SDSTAT);
	p0.l = lo(EBIU_SDSTAT);
	r2.l = w[p0];
	cc = bittst(r2,3);
	if !cc jump .Lskip;
	NOP;
	BITSET (R0, 23);
.Lskip:
	[P2] = R0;
	SSYNC;

	R0.L = lo(mem_SDGCTL);
	R0.H = hi(mem_SDGCTL);
	R1 = [p2];
	R1 = R1 | R0;
	[P2] = R1;
	SSYNC;

	p0.h = hi(SIC_IWR);
	p0.l = lo(SIC_IWR);
	r0.l = lo(IWR_ENABLE_ALL);
	r0.h = hi(IWR_ENABLE_ALL);
	[p0] = r0;
	SSYNC;

	RTS;
ENDPROC(_start_dma_code)
#endif /* CONFIG_BFIN_KERNEL_CLOCK */

ENTRY(_bfin_reset)
	/* No more interrupts to be handled*/
	CLI R6;
	SSYNC;

#if defined(CONFIG_BFIN_SHARED_FLASH_ENET)
	p0.h = hi(FIO_INEN);
	p0.l = lo(FIO_INEN);
	r0.l = ~(1 << CONFIG_ENET_FLASH_PIN);
	w[p0] = r0.l;

	p0.h = hi(FIO_DIR);
	p0.l = lo(FIO_DIR);
	r0.l = (1 << CONFIG_ENET_FLASH_PIN);
	w[p0] = r0.l;

	p0.h = hi(FIO_FLAG_C);
	p0.l = lo(FIO_FLAG_C);
	r0.l = (1 << CONFIG_ENET_FLASH_PIN);
	w[p0] = r0.l;
#endif

	/* Clear the IMASK register */
	p0.h = hi(IMASK);
	p0.l = lo(IMASK);
	r0 = 0x0;
	[p0] = r0;

	/* Clear the ILAT register */
	p0.h = hi(ILAT);
	p0.l = lo(ILAT);
	r0 = [p0];
	[p0] = r0;
	SSYNC;

	/* make sure SYSCR is set to use BMODE */
	P0.h = hi(SYSCR);
	P0.l = lo(SYSCR);
	R0.l = 0x0;
	W[P0] = R0.l;
	SSYNC;

	/* issue a system soft reset */
	P1.h = hi(SWRST);
	P1.l = lo(SWRST);
	R1.l = 0x0007;
	W[P1] = R1;
	SSYNC;

	/* clear system soft reset */
	R0.l = 0x0000;
	W[P0] = R0;
	SSYNC;

	/* issue core reset */
	raise 1;

	RTS;
ENDPROC(_bfin_reset)

#if CONFIG_DEBUG_KERNEL_START
debug_kernel_start_trap:
	/* Set up a temp stack in L1 - SDRAM might not be working  */
	P0.L = lo(L1_DATA_A_START + 0x100);
	P0.H = hi(L1_DATA_A_START + 0x100);
	SP = P0;

	/* Make sure the Clocks are the way I think they should be */
	r0 = CONFIG_VCO_MULT & 63;       /* Load the VCO multiplier         */
	r0 = r0 << 9;                    /* Shift it over,                  */
	r1 = CLKIN_HALF;                 /* Do we need to divide CLKIN by 2?*/
	r0 = r1 | r0;
	r1 = PLL_BYPASS;                 /* Bypass the PLL?                 */
	r1 = r1 << 8;                    /* Shift it over                   */
	r0 = r1 | r0;                    /* add them all together           */

	p0.h = hi(PLL_CTL);
	p0.l = lo(PLL_CTL);              /* Load the address                */
	cli r2;                          /* Disable interrupts              */
	ssync;
	w[p0] = r0.l;                    /* Set the value                   */
	idle;                            /* Wait for the PLL to stablize    */
	sti r2;                          /* Enable interrupts               */

.Lcheck_again1:
	p0.h = hi(PLL_STAT);
	p0.l = lo(PLL_STAT);
	R0 = W[P0](Z);
	CC = BITTST(R0,5);
	if ! CC jump .Lcheck_again1;

	/* Configure SCLK & CCLK Dividers */
	r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
	p0.h = hi(PLL_DIV);
	p0.l = lo(PLL_DIV);
	w[p0] = r0.l;
	ssync;

	/* Make sure UART is enabled - you can never be sure */

/*
 * Setup for console. Argument comes from the menuconfig
 */

#ifdef CONFIG_BAUD_9600
#define CONSOLE_BAUD_RATE       9600
#elif CONFIG_BAUD_19200
#define CONSOLE_BAUD_RATE       19200
#elif CONFIG_BAUD_38400
#define CONSOLE_BAUD_RATE       38400
#elif CONFIG_BAUD_57600
#define CONSOLE_BAUD_RATE       57600
#elif CONFIG_BAUD_115200
#define CONSOLE_BAUD_RATE       115200
#endif

	p0.h = hi(UART_GCTL);
	p0.l = lo(UART_GCTL);
	r0 = 0x00(Z);
	w[p0] = r0.L;   /* To Turn off UART clocks */
	ssync;

	p0.h = hi(UART_LCR);
	p0.l = lo(UART_LCR);
	r0 = 0x83(Z);
	w[p0] = r0.L;   /* To enable DLL writes */
	ssync;

	R1 = (((CONFIG_CLKIN_HZ * CONFIG_VCO_MULT) / CONFIG_SCLK_DIV) / (CONSOLE_BAUD_RATE * 16));

	p0.h = hi(UART_DLL);
	p0.l = lo(UART_DLL);
	r0 = 0xFF(Z);
	r0 = R1 & R0;
	w[p0] = r0.L;
	ssync;

	p0.h = hi(UART_DLH);
	p0.l = lo(UART_DLH);
	r1 >>= 8 ;
	w[p0] = r1.L;
	ssync;

	p0.h = hi(UART_GCTL);
	p0.l = lo(UART_GCTL);
	r0 = 0x0(Z);
	w[p0] = r0.L;   /* To enable UART clock */
	ssync;

	p0.h = hi(UART_LCR);
	p0.l = lo(UART_LCR);
	r0 = 0x03(Z);
	w[p0] = r0.L;   /* To Turn on UART */
	ssync;

	p0.h = hi(UART_GCTL);
	p0.l = lo(UART_GCTL);
	r0 = 0x01(Z);
	w[p0] = r0.L;   /* To Turn on UART Clocks */
	ssync;

	P0.h = hi(UART_THR);
	P0.l = lo(UART_THR);
	P1.h = hi(UART_LSR);
	P1.l = lo(UART_LSR);

	R0.L = 'K';
	call .Lwait_char;
	R0.L='e';
	call .Lwait_char;
	R0.L='r';
	call .Lwait_char;
	R0.L='n'
	call .Lwait_char;
	R0.L='e'
	call .Lwait_char;
	R0.L='l';
	call .Lwait_char;
	R0.L=' ';
	call .Lwait_char;
	R0.L='c';
	call .Lwait_char;
	R0.L='r';
	call .Lwait_char;
	R0.L='a';
	call .Lwait_char;
	R0.L='s';
	call .Lwait_char;
	R0.L='h';
	call .Lwait_char;
	R0.L='\r';
	call .Lwait_char;
	R0.L='\n';
	call .Lwait_char;

	R0.L='S';
	call .Lwait_char;
	R0.L='E';
	call .Lwait_char;
	R0.L='Q'
	call .Lwait_char;
	R0.L='S'
	call .Lwait_char;
	R0.L='T';
	call .Lwait_char;
	R0.L='A';
	call .Lwait_char;
	R0.L='T';
	call .Lwait_char;
	R0.L='=';
	call .Lwait_char;
	R2 = SEQSTAT;
	call .Ldump_reg;

	R0.L=' ';
	call .Lwait_char;
	R0.L='R';
	call .Lwait_char;
	R0.L='E'
	call .Lwait_char;
	R0.L='T'
	call .Lwait_char;
	R0.L='X';
	call .Lwait_char;
	R0.L='=';
	call .Lwait_char;
	R2 = RETX;
	call .Ldump_reg;

	R0.L='\r';
	call .Lwait_char;
	R0.L='\n';
	call .Lwait_char;

.Ldebug_kernel_start_trap_done:
	JUMP    .Ldebug_kernel_start_trap_done;
.Ldump_reg:
	R3 = 32;
	R4 = 0x0F;
	R5 = ':';  /* one past 9 */

.Ldump_reg2:
	R0 = R2;
	R3 += -4;
	R0 >>>= R3;
	R0 = R0 & R4;
	R0 += 0x30;
	CC = R0 <= R5;
	if CC JUMP .Ldump_reg1;
	R0 += 7;

.Ldump_reg1:
	R1.l = W[P1];
	CC = BITTST(R1, 5);
	if !CC JUMP .Ldump_reg1;
	W[P0] = r0;

	CC = R3 == 0;
	if !CC JUMP .Ldump_reg2
	RTS;

.Lwait_char:
	R1.l = W[P1];
	CC = BITTST(R1, 5);
	if !CC JUMP .Lwait_char;
	W[P0] = r0;
	RTS;

#endif  /* CONFIG_DEBUG_KERNEL_START  */

.data

/*
 * Set up the usable of RAM stuff. Size of RAM is determined then
 * an initial stack set up at the end.
 */

.align 4
__rambase:
.long   0
__ramstart:
.long   0
__ramend:
.long   0