xref: /openbmc/u-boot/arch/m68k/cpu/mcf5445x/start.S (revision 014a953c) 
1/*
2 * Copyright (C) 2003	Josef Baumgartner <josef.baumgartner@telex.de>
3 * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
4 *
5 * Copyright 2010-2012 Freescale Semiconductor, Inc.
6 * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
7 *
8 * SPDX-License-Identifier:	GPL-2.0+
9 */
10
11#include <common.h>
12#include <asm-offsets.h>
13#include <config.h>
14#include <timestamp.h>
15#include "version.h"
16#include <asm/cache.h>
17
18#define _START	_start
19#define _FAULT	_fault
20
21#define SAVE_ALL						\
22	move.w	#0x2700,%sr;		/* disable intrs */	\
23	subl	#60,%sp;		/* space for 15 regs */ \
24	moveml	%d0-%d7/%a0-%a6,%sp@;
25
26#define RESTORE_ALL						\
27	moveml	%sp@,%d0-%d7/%a0-%a6;				\
28	addl	#60,%sp;		/* space for 15 regs */ \
29	rte;
30
31#if defined(CONFIG_SERIAL_BOOT)
32#define ASM_DRAMINIT	(asm_dram_init - CONFIG_SYS_TEXT_BASE + \
33	CONFIG_SYS_INIT_RAM_ADDR)
34#define ASM_DRAMINIT_N	(asm_dram_init - CONFIG_SYS_TEXT_BASE)
35#define ASM_SBF_IMG_HDR	(asm_sbf_img_hdr - CONFIG_SYS_TEXT_BASE + \
36	CONFIG_SYS_INIT_RAM_ADDR)
37#endif
38
39.text
40
41/*
42 * Vector table. This is used for initial platform startup.
43 * These vectors are to catch any un-intended traps.
44 */
45_vectors:
46#if defined(CONFIG_SERIAL_BOOT)
47
48INITSP:	.long	0			/* Initial SP	*/
49#ifdef CONFIG_CF_SBF
50INITPC:	.long	ASM_DRAMINIT		/* Initial PC 	*/
51#endif
52#ifdef CONFIG_SYS_NAND_BOOT
53INITPC:	.long	ASM_DRAMINIT_N		/* Initial PC 	*/
54#endif
55
56#else
57
58INITSP:	.long	0			/* Initial SP	*/
59INITPC:	.long	_START			/* Initial PC 	*/
60
61#endif
62
63vector02_0F:
64.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
65.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
66
67/* Reserved */
68vector10_17:
69.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
70
71vector18_1F:
72.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
73
74#if !defined(CONFIG_SERIAL_BOOT)
75
76/* TRAP #0 - #15 */
77vector20_2F:
78.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
79.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
80
81/* Reserved	*/
82vector30_3F:
83.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
84.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
85
86vector64_127:
87.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
88.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
89.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
90.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
91.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
92.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
93.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
94.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
95
96vector128_191:
97.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
98.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
99.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
100.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
101.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
102.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
103.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
104.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
105
106vector192_255:
107.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
108.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
109.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
110.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
111.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
112.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
113.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
114.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
115#endif
116
117#if defined(CONFIG_SERIAL_BOOT)
118	/* Image header: chksum 4 bytes, len 4 bytes, img dest 4 bytes */
119asm_sbf_img_hdr:
120	.long	0x00000000		/* checksum, not yet implemented */
121	.long	0x00040000		/* image length */
122	.long	CONFIG_SYS_TEXT_BASE	/* image to be relocated at */
123
124asm_dram_init:
125	move.w	#0x2700,%sr		/* Mask off Interrupt */
126
127#ifdef CONFIG_SYS_NAND_BOOT
128	/* for assembly stack */
129	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
130	movec	%d0, %RAMBAR1
131
132	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
133	clr.l	%sp@-
134#endif
135
136#ifdef CONFIG_CF_SBF
137	move.l	#CONFIG_SYS_INIT_RAM_ADDR, %d0
138	movec	%d0, %VBR
139
140	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
141	movec	%d0, %RAMBAR1
142
143	/* initialize general use internal ram */
144	move.l	#0, %d0
145	move.l	#(ICACHE_STATUS), %a1	/* icache */
146	move.l	#(DCACHE_STATUS), %a2	/* dcache */
147	move.l	%d0, (%a1)
148	move.l	%d0, (%a2)
149
150	/* invalidate and disable cache */
151	move.l	#(CONFIG_SYS_ICACHE_INV + CONFIG_SYS_DCACHE_INV), %d0
152	movec	%d0, %CACR		/* Invalidate cache */
153	move.l	#0, %d0
154	movec	%d0, %ACR0
155	movec	%d0, %ACR1
156	movec	%d0, %ACR2
157	movec	%d0, %ACR3
158
159	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
160	clr.l	%sp@-
161
162#ifdef CONFIG_SYS_CS0_BASE
163	/* Must disable global address */
164	move.l	#0xFC008000, %a1
165	move.l	#(CONFIG_SYS_CS0_BASE), (%a1)
166	move.l	#0xFC008008, %a1
167	move.l	#(CONFIG_SYS_CS0_CTRL), (%a1)
168	move.l	#0xFC008004, %a1
169	move.l	#(CONFIG_SYS_CS0_MASK), (%a1)
170#endif
171#endif /* CONFIG_CF_SBF */
172
173#ifdef CONFIG_MCF5441x
174	/* TC: enable all peripherals,
175	in the future only enable certain peripherals */
176	move.l	#0xFC04002D, %a1
177
178#if defined(CONFIG_CF_SBF)
179	move.b	#23, (%a1)		/* dspi */
180#endif
181#endif	/* CONFIG_MCF5441x */
182
183	/* mandatory board level ddr-sdram init,
184	 * for both 5441x and 5445x
185	 */
186	bsr	sbf_dram_init
187
188#ifdef CONFIG_CF_SBF
189	/*
190	 * DSPI Initialization
191	 * a0 - general, sram - 0x80008000 - 32, see M54455EVB.h
192	 * a1 - dspi status
193	 * a2 - dtfr
194	 * a3 - drfr
195	 * a4 - Dst addr
196	 */
197	/* Enable pins for DSPI mode - chip-selects are enabled later */
198asm_dspi_init:
199#ifdef CONFIG_MCF5441x
200	move.l	#0xEC09404E, %a1
201	move.l	#0xEC09404F, %a2
202	move.b	#0xFF, (%a1)
203	move.b	#0x80, (%a2)
204#endif
205
206#ifdef CONFIG_MCF5445x
207	move.l	#0xFC0A4063, %a0
208	move.b	#0x7F, (%a0)
209#endif
210	/* Configure DSPI module */
211	move.l	#0xFC05C000, %a0
212	move.l	#0x80FF0C00, (%a0)	/* Master, clear TX/RX FIFO */
213
214	move.l	#0xFC05C00C, %a0
215#ifdef CONFIG_MCF5441x
216	move.l	#0x3E000016, (%a0)
217#endif
218#ifdef CONFIG_MCF5445x
219	move.l	#0x3E000011, (%a0)
220#endif
221
222	move.l	#0xFC05C034, %a2	/* dtfr */
223	move.l	#0xFC05C03B, %a3	/* drfr */
224
225	move.l	#(ASM_SBF_IMG_HDR + 4), %a1
226	move.l	(%a1)+, %d5
227	move.l	(%a1), %a4
228
229	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_SBFHDR_DATA_OFFSET), %a0
230	move.l	#(CONFIG_SYS_SBFHDR_SIZE), %d4
231
232	move.l	#0xFC05C02C, %a1	/* dspi status */
233
234	/* Issue commands and address */
235	move.l	#0x8002000B, %d2	/* Fast Read Cmd */
236	jsr	asm_dspi_wr_status
237	jsr	asm_dspi_rd_status
238
239	move.l	#0x80020000, %d2	/* Address byte 2 */
240	jsr	asm_dspi_wr_status
241	jsr	asm_dspi_rd_status
242
243	move.l	#0x80020000, %d2	/* Address byte 1 */
244	jsr	asm_dspi_wr_status
245	jsr	asm_dspi_rd_status
246
247	move.l	#0x80020000, %d2	/* Address byte 0 */
248	jsr	asm_dspi_wr_status
249	jsr	asm_dspi_rd_status
250
251	move.l	#0x80020000, %d2	/* Dummy Wr and Rd */
252	jsr	asm_dspi_wr_status
253	jsr	asm_dspi_rd_status
254
255	/* Transfer serial boot header to sram */
256asm_dspi_rd_loop1:
257	move.l	#0x80020000, %d2
258	jsr	asm_dspi_wr_status
259	jsr	asm_dspi_rd_status
260
261	move.b	%d1, (%a0)		/* read, copy to dst */
262
263	add.l	#1, %a0			/* inc dst by 1 */
264	sub.l	#1, %d4			/* dec cnt by 1 */
265	bne	asm_dspi_rd_loop1
266
267	/* Transfer u-boot from serial flash to memory */
268asm_dspi_rd_loop2:
269	move.l	#0x80020000, %d2
270	jsr	asm_dspi_wr_status
271	jsr	asm_dspi_rd_status
272
273	move.b	%d1, (%a4)		/* read, copy to dst */
274
275	add.l	#1, %a4			/* inc dst by 1 */
276	sub.l	#1, %d5			/* dec cnt by 1 */
277	bne	asm_dspi_rd_loop2
278
279	move.l	#0x00020000, %d2	/* Terminate */
280	jsr	asm_dspi_wr_status
281	jsr	asm_dspi_rd_status
282
283	/* jump to memory and execute */
284	move.l	#(CONFIG_SYS_TEXT_BASE + 0x400), %a0
285	jmp	(%a0)
286
287asm_dspi_wr_status:
288	move.l	(%a1), %d0		/* status */
289	and.l	#0x0000F000, %d0
290	cmp.l	#0x00003000, %d0
291	bgt	asm_dspi_wr_status
292
293	move.l	%d2, (%a2)
294	rts
295
296asm_dspi_rd_status:
297	move.l	(%a1), %d0		/* status */
298	and.l	#0x000000F0, %d0
299	lsr.l	#4, %d0
300	cmp.l	#0, %d0
301	beq	asm_dspi_rd_status
302
303	move.b	(%a3), %d1
304	rts
305#endif /* CONFIG_CF_SBF */
306
307#ifdef CONFIG_SYS_NAND_BOOT
308	/* copy 4 boot pages to dram as soon as possible */
309	/* each page is 996 bytes (1056 total with 60 ECC bytes */
310	move.l  #0x00000000, %a1	/* src */
311	move.l	#CONFIG_SYS_TEXT_BASE, %a2		/* dst */
312	move.l	#0x3E0, %d0		/* sz in long */
313
314asm_boot_nand_copy:
315	move.l	(%a1)+, (%a2)+
316	subq.l	#1, %d0
317	bne	asm_boot_nand_copy
318
319	/* jump to memory and execute */
320	move.l	#(asm_nand_init), %a0
321	jmp	(%a0)
322
323asm_nand_init:
324	/* exit nand boot-mode */
325	move.l	#0xFC0FFF30, %a1
326	or.l	#0x00000040, %d1
327	move.l	%d1, (%a1)
328
329	/* initialize general use internal ram */
330	move.l	#0, %d0
331	move.l	#(CACR_STATUS), %a1	/* CACR */
332	move.l	#(ICACHE_STATUS), %a2	/* icache */
333	move.l	#(DCACHE_STATUS), %a3	/* dcache */
334	move.l	%d0, (%a1)
335	move.l	%d0, (%a2)
336	move.l	%d0, (%a3)
337
338	/* invalidate and disable cache */
339	move.l	#0x01004100, %d0	/* Invalidate cache cmd */
340	movec	%d0, %CACR		/* Invalidate cache */
341	move.l	#0, %d0
342	movec	%d0, %ACR0
343	movec	%d0, %ACR1
344	movec	%d0, %ACR2
345	movec	%d0, %ACR3
346
347#ifdef CONFIG_SYS_CS0_BASE
348	/* Must disable global address */
349	move.l	#0xFC008000, %a1
350	move.l	#(CONFIG_SYS_CS0_BASE), (%a1)
351	move.l	#0xFC008008, %a1
352	move.l	#(CONFIG_SYS_CS0_CTRL), (%a1)
353	move.l	#0xFC008004, %a1
354	move.l	#(CONFIG_SYS_CS0_MASK), (%a1)
355#endif
356
357	/* NAND port configuration */
358	move.l	#0xEC094048, %a1
359	move.b	#0xFD, (%a1)+
360	move.b	#0x5F, (%a1)+
361	move.b	#0x04, (%a1)+
362
363	/* reset nand */
364	move.l  #0xFC0FFF38, %a1	/* isr */
365	move.l  #0x000e0000, (%a1)
366	move.l	#0xFC0FFF08, %a2
367	move.l	#0x00000000, (%a2)+	/* car */
368	move.l	#0x11000000, (%a2)+	/* rar */
369	move.l	#0x00000000, (%a2)+	/* rpt */
370	move.l	#0x00000000, (%a2)+	/* rai */
371	move.l  #0xFC0FFF2c, %a2	/* cfg */
372	move.l  #0x00000000, (%a2)+	/* secsz */
373	move.l  #0x000e0681, (%a2)+
374	move.l  #0xFC0FFF04, %a2	/* cmd2 */
375	move.l  #0xFF404001, (%a2)
376	move.l  #0x000e0000, (%a1)
377
378	move.l	#0x2000, %d1
379	bsr	asm_delay
380
381	/* setup nand */
382	move.l  #0xFC0FFF00, %a1
383	move.l  #0x30700000, (%a1)+	/* cmd1 */
384	move.l  #0x007EF000, (%a1)+	/* cmd2 */
385
386	move.l  #0xFC0FFF2C, %a1
387	move.l  #0x00000841, (%a1)+	/* secsz */
388	move.l  #0x000e0681, (%a1)+	/* cfg */
389
390	move.l	#100, %d4		/* 100 pages ~200KB */
391	move.l	#4, %d2			/* start at 4 */
392	move.l  #0xFC0FFF04, %a0	/* cmd2 */
393	move.l  #0xFC0FFF0C, %a1	/* rar */
394	move.l	#(CONFIG_SYS_TEXT_BASE + 0xF80), %a2
395
396asm_nand_read:
397	move.l	#0x11000000, %d0	/* rar */
398	or.l	%d2, %d0
399	move.l	%d0, (%a1)
400	add.l	#1, %d2
401
402	move.l	(%a0), %d0		/* cmd2 */
403	or.l	#1, %d0
404	move.l	%d0, (%a0)
405
406	move.l	#0x200, %d1
407	bsr	asm_delay
408
409asm_nand_chk_status:
410	move.l  #0xFC0FFF38, %a4	/* isr */
411	move.l	(%a4), %d0
412	and.l	#0x40000000, %d0
413	tst.l	%d0
414	beq	asm_nand_chk_status
415
416	move.l  #0xFC0FFF38, %a4	/* isr */
417	move.l	(%a4), %d0
418	or.l	#0x000E0000, %d0
419	move.l	%d0, (%a4)
420
421	move.l	#0x200, %d3
422	move.l	#0xFC0FC000, %a3	/* buf 1 */
423asm_nand_copy:
424	move.l	(%a3)+, (%a2)+
425	subq.l	#1, %d3
426	bgt	asm_nand_copy
427
428	subq.l	#1, %d4
429	bgt	asm_nand_read
430
431	/* jump to memory and execute */
432	move.l	#(CONFIG_SYS_TEXT_BASE + 0x400), %a0
433	jmp	(%a0)
434
435#endif			/* CONFIG_SYS_NAND_BOOT */
436
437.globl asm_delay
438asm_delay:
439	nop
440	subq.l	#1, %d1
441	bne	asm_delay
442	rts
443#endif			/* CONFIG_CF_SBF || CONFIG_NAND_U_BOOT */
444
445.text
446	. = 0x400
447.globl _start
448_start:
449#if !defined(CONFIG_SERIAL_BOOT)
450	nop
451	nop
452	move.w	#0x2700,%sr		/* Mask off Interrupt */
453
454	/* Set vector base register at the beginning of the Flash */
455	move.l	#CONFIG_SYS_FLASH_BASE, %d0
456	movec	%d0, %VBR
457
458	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
459	movec	%d0, %RAMBAR1
460
461	/* initialize general use internal ram */
462	move.l	#0, %d0
463	move.l	#(ICACHE_STATUS), %a1	/* icache */
464	move.l	#(DCACHE_STATUS), %a2	/* dcache */
465	move.l	%d0, (%a1)
466	move.l	%d0, (%a2)
467
468	/* invalidate and disable cache */
469	move.l	#(CONFIG_SYS_ICACHE_INV + CONFIG_SYS_DCACHE_INV), %d0
470	movec	%d0, %CACR		/* Invalidate cache */
471	move.l	#0, %d0
472	movec	%d0, %ACR0
473	movec	%d0, %ACR1
474	movec	%d0, %ACR2
475	movec	%d0, %ACR3
476#else
477	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
478	movec	%d0, %RAMBAR1
479#endif
480
481	/* put relocation table address to a5 */
482	move.l	#__got_start, %a5
483
484	/* setup stack initially on top of internal static ram  */
485	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp
486
487	/*
488	 * if configured, malloc_f arena will be reserved first,
489	 * then (and always) gd struct space will be reserved
490	 */
491	move.l	%sp, -(%sp)
492	move.l	#board_init_f_alloc_reserve, %a1
493	jsr	(%a1)
494
495	/* update stack and frame-pointers */
496	move.l	%d0, %sp
497	move.l	%sp, %fp
498
499	/* initialize reserved area */
500	move.l	%d0, -(%sp)
501	move.l	#board_init_f_init_reserve, %a1
502	jsr	(%a1)
503
504	/* run low-level CPU init code (from flash) */
505	move.l	#cpu_init_f, %a1
506	jsr	(%a1)
507
508	/* run low-level board init code (from flash) */
509	clr.l   %sp@-
510	move.l	#board_init_f, %a1
511	jsr	(%a1)
512
513	/* board_init_f() does not return */
514
515/******************************************************************************/
516
517/*
518 * void relocate_code (addr_sp, gd, addr_moni)
519 *
520 * This "function" does not return, instead it continues in RAM
521 * after relocating the monitor code.
522 *
523 * r3 = dest
524 * r4 = src
525 * r5 = length in bytes
526 * r6 = cachelinesize
527 */
528.globl relocate_code
529relocate_code:
530	link.w	%a6,#0
531	move.l	8(%a6), %sp		/* set new stack pointer */
532
533	move.l	12(%a6), %d0		/* Save copy of Global Data pointer */
534	move.l	16(%a6), %a0		/* Save copy of Destination Address */
535
536	move.l	#CONFIG_SYS_MONITOR_BASE, %a1
537	move.l	#__init_end, %a2
538	move.l	%a0, %a3
539
540	/* copy the code to RAM */
5411:
542	move.l	(%a1)+, (%a3)+
543	cmp.l	%a1,%a2
544	bgt.s	1b
545
546/*
547 * We are done. Do not return, instead branch to second part of board
548 * initialization, now running from RAM.
549 */
550	move.l	%a0, %a1
551	add.l	#(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
552	jmp	(%a1)
553
554in_ram:
555
556clear_bss:
557	/*
558	 * Now clear BSS segment
559	 */
560	move.l	%a0, %a1
561	add.l	#(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
562	move.l	%a0, %d1
563	add.l	#(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
5646:
565	clr.l	(%a1)+
566	cmp.l	%a1,%d1
567	bgt.s	6b
568
569	/*
570	 * fix got table in RAM
571	 */
572	move.l	%a0, %a1
573	add.l	#(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
574	move.l	%a1,%a5			/* fix got pointer register a5 */
575
576	move.l	%a0, %a2
577	add.l	#(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
578
5797:
580	move.l	(%a1),%d1
581	sub.l	#_start,%d1
582	add.l	%a0,%d1
583	move.l	%d1,(%a1)+
584	cmp.l	%a2, %a1
585	bne	7b
586
587	/* calculate relative jump to board_init_r in ram */
588	move.l	%a0, %a1
589	add.l	#(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
590
591	/* set parameters for board_init_r */
592	move.l	%a0,-(%sp)		/* dest_addr */
593	move.l	%d0,-(%sp)		/* gd */
594	jsr	(%a1)
595
596/******************************************************************************/
597
598/* exception code */
599.globl _fault
600_fault:
601	bra	_fault
602
603.globl _exc_handler
604_exc_handler:
605	SAVE_ALL
606	movel	%sp,%sp@-
607	bsr	exc_handler
608	addql	#4,%sp
609	RESTORE_ALL
610
611.globl _int_handler
612_int_handler:
613	SAVE_ALL
614	movel	%sp,%sp@-
615	bsr	int_handler
616	addql	#4,%sp
617	RESTORE_ALL
618
619/******************************************************************************/
620
621.globl version_string
622version_string:
623.ascii U_BOOT_VERSION_STRING, "\0"
624.align 4
625