2 * Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
3 * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
4 * Copyright (C) 2000,2001,2002 Wolfgang Denk <wd@denx.de>
6 * See file CREDITS for list of people who contributed to this
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
24 /*------------------------------------------------------------------------------+ */
26 /* This source code has been made available to you by IBM on an AS-IS */
27 /* basis. Anyone receiving this source is licensed under IBM */
28 /* copyrights to use it in any way he or she deems fit, including */
29 /* copying it, modifying it, compiling it, and redistributing it either */
30 /* with or without modifications. No license under IBM patents or */
31 /* patent applications is to be implied by the copyright license. */
33 /* Any user of this software should understand that IBM cannot provide */
34 /* technical support for this software and will not be responsible for */
35 /* any consequences resulting from the use of this software. */
37 /* Any person who transfers this source code or any derivative work */
38 /* must include the IBM copyright notice, this paragraph, and the */
39 /* preceding two paragraphs in the transferred software. */
41 /* COPYRIGHT I B M CORPORATION 1995 */
42 /* LICENSED MATERIAL - PROGRAM PROPERTY OF I B M */
43 /*------------------------------------------------------------------------------- */
45 /* U-Boot - Startup Code for AMCC 4xx PowerPC based Embedded Boards
48 * The processor starts at 0xfffffffc and the code is executed
50 * in memory, but as long we don't jump around before relocating.
51 * board_init lies at a quite high address and when the cpu has
52 * jumped there, everything is ok.
53 * This works because the cpu gives the FLASH (CS0) the whole
54 * address space at startup, and board_init lies as a echo of
55 * the flash somewhere up there in the memorymap.
57 * board_init will change CS0 to be positioned at the correct
58 * address and (s)dram will be positioned at address 0
65 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
67 #include <ppc_asm.tmpl>
70 #include <asm/cache.h>
73 #ifndef CONFIG_IDENT_STRING
74 #define CONFIG_IDENT_STRING ""
77 #ifdef CFG_INIT_DCACHE_CS
78 # if (CFG_INIT_DCACHE_CS == 0)
82 # if (CFG_INIT_DCACHE_CS == 1)
86 # if (CFG_INIT_DCACHE_CS == 2)
90 # if (CFG_INIT_DCACHE_CS == 3)
94 # if (CFG_INIT_DCACHE_CS == 4)
98 # if (CFG_INIT_DCACHE_CS == 5)
102 # if (CFG_INIT_DCACHE_CS == 6)
106 # if (CFG_INIT_DCACHE_CS == 7)
110 #endif /* CFG_INIT_DCACHE_CS */
112 /* We don't want the MMU yet.
115 #define MSR_KERNEL ( MSR_ME ) /* Machine Check */
118 .extern ext_bus_cntlr_init
122 * Set up GOT: Global Offset Table
124 * Use r14 to access the GOT
127 GOT_ENTRY(_GOT2_TABLE_)
128 GOT_ENTRY(_FIXUP_TABLE_)
131 GOT_ENTRY(_start_of_vectors)
132 GOT_ENTRY(_end_of_vectors)
133 GOT_ENTRY(transfer_to_handler)
135 GOT_ENTRY(__init_end)
137 GOT_ENTRY(__bss_start)
141 * 440 Startup -- on reset only the top 4k of the effective
142 * address space is mapped in by an entry in the instruction
143 * and data shadow TLB. The .bootpg section is located in the
144 * top 4k & does only what's necessary to map in the the rest
145 * of the boot rom. Once the boot rom is mapped in we can
146 * proceed with normal startup.
148 * NOTE: CS0 only covers the top 2MB of the effective address
152 #if defined(CONFIG_440)
153 .section .bootpg,"ax"
156 /**************************************************************************/
158 /*----------------------------------------------------------------+
159 | Core bug fix. Clear the esr
160 +-----------------------------------------------------------------*/
163 /*----------------------------------------------------------------*/
164 /* Clear and set up some registers. */
165 /*----------------------------------------------------------------*/
166 iccci r0,r0 /* NOTE: operands not used for 440 */
167 dccci r0,r0 /* NOTE: operands not used for 440 */
174 #if defined(CONFIG_440GX) || defined(CONFIG_440SP) || defined(CONFIG_440SPE) /* NOTE: 440GX adds machine check status regs */
180 /*----------------------------------------------------------------*/
181 /* Initialize debug */
182 /*----------------------------------------------------------------*/
195 mtspr dbsr,r1 /* Clear all valid bits */
197 /*----------------------------------------------------------------*/
199 /*----------------------------------------------------------------*/
200 /* Disable store gathering & broadcast, guarantee inst/data
201 * cache block touch, force load/store alignment
202 * (see errata 1.12: 440_33)
204 lis r1,0x0030 /* store gathering & broadcast disable */
205 ori r1,r1,0x6000 /* cache touch */
208 #if defined (CONFIG_440SPE)
209 /*----------------------------------------------------------------+
210 | Initialize Core Configuration Reg1.
211 | a. ICDPEI: Record even parity. Normal operation.
212 | b. ICTPEI: Record even parity. Normal operation.
213 | c. DCTPEI: Record even parity. Normal operation.
214 | d. DCDPEI: Record even parity. Normal operation.
215 | e. DCUPEI: Record even parity. Normal operation.
216 | f. DCMPEI: Record even parity. Normal operation.
217 | g. FCOM: Normal operation
218 | h. MMUPEI: Record even parity. Normal operation.
219 | i. FFF: Flush only as much data as necessary.
220 | j. TCS: Timebase increments from CPU clock.
221 +-----------------------------------------------------------------*/
225 /*----------------------------------------------------------------+
226 | Reset the timebase.
227 | The previous write to CCR1 sets the timebase source.
228 +-----------------------------------------------------------------*/
233 /*----------------------------------------------------------------*/
234 /* Setup interrupt vectors */
235 /*----------------------------------------------------------------*/
236 mtspr ivpr,r0 /* Vectors start at 0x0000_0000 */
238 mtspr ivor0,r1 /* Critical input */
240 mtspr ivor1,r1 /* Machine check */
242 mtspr ivor2,r1 /* Data storage */
244 mtspr ivor3,r1 /* Instruction storage */
246 mtspr ivor4,r1 /* External interrupt */
248 mtspr ivor5,r1 /* Alignment */
250 mtspr ivor6,r1 /* Program check */
252 mtspr ivor7,r1 /* Floating point unavailable */
254 mtspr ivor8,r1 /* System call */
256 mtspr ivor10,r1 /* Decrementer (PIT for 440) */
258 mtspr ivor13,r1 /* Data TLB error */
260 mtspr ivor14,r1 /* Instr TLB error */
262 mtspr ivor15,r1 /* Debug */
264 /*----------------------------------------------------------------*/
265 /* Configure cache regions */
266 /*----------------------------------------------------------------*/
284 /*----------------------------------------------------------------*/
285 /* Cache victim limits */
286 /*----------------------------------------------------------------*/
287 /* floors 0, ceiling max to use the entire cache -- nothing locked
294 /*----------------------------------------------------------------+
295 |Initialize MMUCR[STID] = 0.
296 +-----------------------------------------------------------------*/
303 /*----------------------------------------------------------------*/
304 /* Clear all TLB entries -- TID = 0, TS = 0 */
305 /*----------------------------------------------------------------*/
307 li r1,0x003f /* 64 TLB entries */
309 rsttlb: tlbwe r0,r1,0x0000 /* Invalidate all entries (V=0)*/
315 /*----------------------------------------------------------------*/
316 /* TLB entry setup -- step thru tlbtab */
317 /*----------------------------------------------------------------*/
318 #if defined(CONFIG_440SPE)
319 /*----------------------------------------------------------------*/
320 /* We have different TLB tables for revA and rev B of 440SPe */
321 /*----------------------------------------------------------------*/
333 bl tlbtab /* Get tlbtab pointer */
336 li r1,0x003f /* 64 TLB entries max */
343 beq 2f /* 0 marks end */
346 tlbwe r0,r4,0 /* TLB Word 0 */
347 tlbwe r1,r4,1 /* TLB Word 1 */
348 tlbwe r2,r4,2 /* TLB Word 2 */
349 addi r4,r4,1 /* Next TLB */
352 /*----------------------------------------------------------------*/
353 /* Continue from 'normal' start */
354 /*----------------------------------------------------------------*/
359 mtspr srr1,r0 /* Keep things disabled for now */
363 #endif /* CONFIG_440 */
366 * r3 - 1st arg to board_init(): IMMP pointer
367 * r4 - 2nd arg to board_init(): boot flag
370 .long 0x27051956 /* U-Boot Magic Number */
371 .globl version_string
373 .ascii U_BOOT_VERSION
374 .ascii " (", __DATE__, " - ", __TIME__, ")"
375 .ascii CONFIG_IDENT_STRING, "\0"
378 * Maybe this should be moved somewhere else because the current
379 * location (0x100) is where the CriticalInput Execption should be.
381 . = EXC_OFF_SYS_RESET
385 /*****************************************************************************/
386 #if defined(CONFIG_440)
388 /*----------------------------------------------------------------*/
389 /* Clear and set up some registers. */
390 /*----------------------------------------------------------------*/
393 mtspr dec,r0 /* prevent dec exceptions */
394 mtspr tbl,r0 /* prevent fit & wdt exceptions */
396 mtspr tsr,r1 /* clear all timer exception status */
397 mtspr tcr,r0 /* disable all */
398 mtspr esr,r0 /* clear exception syndrome register */
399 mtxer r0 /* clear integer exception register */
401 /*----------------------------------------------------------------*/
402 /* Debug setup -- some (not very good) ice's need an event*/
403 /* to establish control :-( Define CFG_INIT_DBCR to the dbsr */
404 /* value you need in this case 0x8cff 0000 should do the trick */
405 /*----------------------------------------------------------------*/
406 #if defined(CFG_INIT_DBCR)
409 mtspr dbsr,r1 /* Clear all status bits */
410 lis r0,CFG_INIT_DBCR@h
411 ori r0,r0,CFG_INIT_DBCR@l
416 /*----------------------------------------------------------------*/
417 /* Setup the internal SRAM */
418 /*----------------------------------------------------------------*/
420 #if defined(CONFIG_440EP) || defined(CONFIG_440GR)
421 /* Clear Dcache to use as RAM */
422 addis r3,r0,CFG_INIT_RAM_ADDR@h
423 ori r3,r3,CFG_INIT_RAM_ADDR@l
424 addis r4,r0,CFG_INIT_RAM_END@h
425 ori r4,r4,CFG_INIT_RAM_END@l
426 rlwinm. r5,r4,0,27,31
437 #if defined (CONFIG_440GX) || defined(CONFIG_440SP) || defined(CONFIG_440SPE)
438 mtdcr l2_cache_cfg,r0 /* Ensure L2 Cache is off */
440 mtdcr isram0_sb1cr,r0 /* Disable bank 1 */
445 and r1,r1,r2 /* Disable parity check */
448 andis. r1,r1,r2 /* Disable pwr mgmt */
451 lis r1,0x8000 /* BAS = 8000_0000 */
452 #if defined(CONFIG_440GX) || defined(CONFIG_440SP)
453 ori r1,r1,0x0980 /* first 64k */
454 mtdcr isram0_sb0cr,r1
456 ori r1,r1,0x0980 /* second 64k */
457 mtdcr isram0_sb1cr,r1
459 ori r1,r1, 0x0980 /* third 64k */
460 mtdcr isram0_sb2cr,r1
462 ori r1,r1, 0x0980 /* fourth 64k */
463 mtdcr isram0_sb3cr,r1
464 #elif defined(CONFIG_440SPE)
465 lis r1,0x0000 /* BAS = 0000_0000 */
466 ori r1,r1,0x0984 /* first 64k */
467 mtdcr isram0_sb0cr,r1
469 ori r1,r1,0x0984 /* second 64k */
470 mtdcr isram0_sb1cr,r1
472 ori r1,r1, 0x0984 /* third 64k */
473 mtdcr isram0_sb2cr,r1
475 ori r1,r1, 0x0984 /* fourth 64k */
476 mtdcr isram0_sb3cr,r1
478 ori r1,r1,0x0380 /* 8k rw */
479 mtdcr isram0_sb0cr,r1
483 /*----------------------------------------------------------------*/
484 /* Setup the stack in internal SRAM */
485 /*----------------------------------------------------------------*/
486 lis r1,CFG_INIT_RAM_ADDR@h
487 ori r1,r1,CFG_INIT_SP_OFFSET@l
490 stwu r0,-4(r1) /* Terminate call chain */
492 stwu r1,-8(r1) /* Save back chain and move SP */
493 lis r0,RESET_VECTOR@h /* Address of reset vector */
494 ori r0,r0, RESET_VECTOR@l
495 stwu r1,-8(r1) /* Save back chain and move SP */
496 stw r0,+12(r1) /* Save return addr (underflow vect) */
500 bl cpu_init_f /* run low-level CPU init code (from Flash) */
503 #endif /* CONFIG_440 */
505 /*****************************************************************************/
507 /*----------------------------------------------------------------------- */
508 /* Set up some machine state registers. */
509 /*----------------------------------------------------------------------- */
510 addi r0,r0,0x0000 /* initialize r0 to zero */
511 mtspr esr,r0 /* clear Exception Syndrome Reg */
512 mttcr r0 /* timer control register */
513 mtexier r0 /* disable all interrupts */
514 addis r4,r0,0xFFFF /* set r4 to 0xFFFFFFFF (status in the */
515 ori r4,r4,0xFFFF /* dbsr is cleared by setting bits to 1) */
516 mtdbsr r4 /* clear/reset the dbsr */
517 mtexisr r4 /* clear all pending interrupts */
519 mtexier r4 /* enable critical exceptions */
520 addis r4,r0,0x0000 /* assume 403GCX - enable core clk */
521 ori r4,r4,0x4020 /* dbling (no harm done on GA and GC */
522 mtiocr r4 /* since bit not used) & DRC to latch */
523 /* data bus on rising edge of CAS */
524 /*----------------------------------------------------------------------- */
526 /*----------------------------------------------------------------------- */
528 /*----------------------------------------------------------------------- */
529 /* Invalidate i-cache and d-cache TAG arrays. */
530 /*----------------------------------------------------------------------- */
531 addi r3,0,1024 /* 1/4 of I-cache size, half of D-cache */
532 addi r4,0,1024 /* 1/4 of I-cache */
537 addic. r3,r3,-16 /* move back one cache line */
538 bne ..cloop /* loop back to do rest until r3 = 0 */
541 /* initialize IOP480 so it can read 1 MB code area for SRAM spaces */
542 /* this requires enabling MA[17..0], by default only MA[12..0] are enabled. */
545 /* first copy IOP480 register base address into r3 */
546 addis r3,0,0x5000 /* IOP480 register base address hi */
547 /* ori r3,r3,0x0000 / IOP480 register base address lo */
550 /* use r4 as the working variable */
551 /* turn on CS3 (LOCCTL.7) */
552 lwz r4,0x84(r3) /* LOCTL is at offset 0x84 */
553 andi. r4,r4,0xff7f /* make bit 7 = 0 -- CS3 mode */
554 stw r4,0x84(r3) /* LOCTL is at offset 0x84 */
557 #ifdef CONFIG_DASA_SIM
558 /* use r4 as the working variable */
559 /* turn on MA17 (LOCCTL.7) */
560 lwz r4,0x84(r3) /* LOCTL is at offset 0x84 */
561 ori r4,r4,0x80 /* make bit 7 = 1 -- MA17 mode */
562 stw r4,0x84(r3) /* LOCTL is at offset 0x84 */
565 /* turn on MA16..13 (LCS0BRD.12 = 0) */
566 lwz r4,0x100(r3) /* LCS0BRD is at offset 0x100 */
567 andi. r4,r4,0xefff /* make bit 12 = 0 */
568 stw r4,0x100(r3) /* LCS0BRD is at offset 0x100 */
570 /* make sure above stores all comlete before going on */
573 /* last thing, set local init status done bit (DEVINIT.31) */
574 lwz r4,0x80(r3) /* DEVINIT is at offset 0x80 */
575 oris r4,r4,0x8000 /* make bit 31 = 1 */
576 stw r4,0x80(r3) /* DEVINIT is at offset 0x80 */
578 /* clear all pending interrupts and disable all interrupts */
579 li r4,-1 /* set p1 to 0xffffffff */
580 stw r4,0x1b0(r3) /* clear all pending interrupts */
581 stw r4,0x1b8(r3) /* clear all pending interrupts */
582 li r4,0 /* set r4 to 0 */
583 stw r4,0x1b4(r3) /* disable all interrupts */
584 stw r4,0x1bc(r3) /* disable all interrupts */
586 /* make sure above stores all comlete before going on */
589 /*----------------------------------------------------------------------- */
590 /* Enable two 128MB cachable regions. */
591 /*----------------------------------------------------------------------- */
594 mticcr r1 /* instruction cache */
598 mtdccr r1 /* data cache */
600 addis r1,r0,CFG_INIT_RAM_ADDR@h
601 ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack to SDRAM */
602 li r0, 0 /* Make room for stack frame header and */
603 stwu r0, -4(r1) /* clear final stack frame so that */
604 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
606 GET_GOT /* initialize GOT access */
608 bl board_init_f /* run first part of init code (from Flash) */
610 #endif /* CONFIG_IOP480 */
612 /*****************************************************************************/
613 #if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405) || defined(CONFIG_405EP)
614 /*----------------------------------------------------------------------- */
615 /* Clear and set up some registers. */
616 /*----------------------------------------------------------------------- */
620 mtesr r4 /* clear Exception Syndrome Reg */
621 mttcr r4 /* clear Timer Control Reg */
622 mtxer r4 /* clear Fixed-Point Exception Reg */
623 mtevpr r4 /* clear Exception Vector Prefix Reg */
624 addi r4,r0,(0xFFFF-0x10000) /* set r4 to 0xFFFFFFFF (status in the */
625 /* dbsr is cleared by setting bits to 1) */
626 mtdbsr r4 /* clear/reset the dbsr */
628 /*----------------------------------------------------------------------- */
629 /* Invalidate I and D caches. Enable I cache for defined memory regions */
630 /* to speed things up. Leave the D cache disabled for now. It will be */
631 /* enabled/left disabled later based on user selected menu options. */
632 /* Be aware that the I cache may be disabled later based on the menu */
633 /* options as well. See miscLib/main.c. */
634 /*----------------------------------------------------------------------- */
638 /*----------------------------------------------------------------------- */
639 /* Enable two 128MB cachable regions. */
640 /*----------------------------------------------------------------------- */
643 mticcr r4 /* instruction cache */
648 mtdccr r4 /* data cache */
650 #if !(defined(CFG_EBC_PB0AP) && defined(CFG_EBC_PB0CR))
651 /*----------------------------------------------------------------------- */
652 /* Tune the speed and size for flash CS0 */
653 /*----------------------------------------------------------------------- */
654 bl ext_bus_cntlr_init
657 #if defined(CONFIG_405EP)
658 /*----------------------------------------------------------------------- */
659 /* DMA Status, clear to come up clean */
660 /*----------------------------------------------------------------------- */
661 addis r3,r0, 0xFFFF /* Clear all existing DMA status */
665 bl ppc405ep_init /* do ppc405ep specific init */
666 #endif /* CONFIG_405EP */
668 #if defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE)
669 /********************************************************************
670 * Setup OCM - On Chip Memory
671 *******************************************************************/
675 mfdcr r3, ocmiscntl /* get instr-side IRAM config */
676 mfdcr r4, ocmdscntl /* get data-side IRAM config */
677 and r3, r3, r0 /* disable data-side IRAM */
678 and r4, r4, r0 /* disable data-side IRAM */
679 mtdcr ocmiscntl, r3 /* set instr-side IRAM config */
680 mtdcr ocmdscntl, r4 /* set data-side IRAM config */
683 addis r3, 0, CFG_OCM_DATA_ADDR@h /* OCM location */
685 addis r4, 0, 0xC000 /* OCM data area enabled */
690 /*----------------------------------------------------------------------- */
691 /* Setup temporary stack in DCACHE or OCM if needed for SDRAM SPD. */
692 /*----------------------------------------------------------------------- */
693 #ifdef CFG_INIT_DCACHE_CS
694 /*----------------------------------------------------------------------- */
695 /* Memory Bank x (nothingness) initialization 1GB+64MEG */
696 /* used as temporary stack pointer for stage0 */
697 /*----------------------------------------------------------------------- */
710 /* turn on data chache for this region */
714 /* set stack pointer and clear stack to known value */
716 lis r1,CFG_INIT_RAM_ADDR@h
717 ori r1,r1,CFG_INIT_SP_OFFSET@l
719 li r4,2048 /* we store 2048 words to stack */
722 lis r2,CFG_INIT_RAM_ADDR@h /* we also clear data area */
723 ori r2,r2,CFG_INIT_RAM_END@l /* so cant copy value from r1 */
725 lis r4,0xdead /* we store 0xdeaddead in the stack */
732 li r0, 0 /* Make room for stack frame header and */
733 stwu r0, -4(r1) /* clear final stack frame so that */
734 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
736 * Set up a dummy frame to store reset vector as return address.
737 * this causes stack underflow to reset board.
739 stwu r1, -8(r1) /* Save back chain and move SP */
740 addis r0, 0, RESET_VECTOR@h /* Address of reset vector */
741 ori r0, r0, RESET_VECTOR@l
742 stwu r1, -8(r1) /* Save back chain and move SP */
743 stw r0, +12(r1) /* Save return addr (underflow vect) */
745 #elif defined(CFG_TEMP_STACK_OCM) && \
746 (defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE))
751 /* Set up Stack at top of OCM */
752 lis r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@h
753 ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@l
755 /* Set up a zeroized stack frame so that backtrace works right */
761 * Set up a dummy frame to store reset vector as return address.
762 * this causes stack underflow to reset board.
764 stwu r1, -8(r1) /* Save back chain and move SP */
765 lis r0, RESET_VECTOR@h /* Address of reset vector */
766 ori r0, r0, RESET_VECTOR@l
767 stwu r1, -8(r1) /* Save back chain and move SP */
768 stw r0, +12(r1) /* Save return addr (underflow vect) */
769 #endif /* CFG_INIT_DCACHE_CS */
771 /*----------------------------------------------------------------------- */
772 /* Initialize SDRAM Controller */
773 /*----------------------------------------------------------------------- */
777 * Setup temporary stack pointer only for boards
778 * that do not use SDRAM SPD I2C stuff since it
779 * is already initialized to use DCACHE or OCM
782 #if !(defined(CFG_INIT_DCACHE_CS) || defined(CFG_TEMP_STACK_OCM))
783 lis r1, CFG_INIT_RAM_ADDR@h
784 ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack in SDRAM */
786 li r0, 0 /* Make room for stack frame header and */
787 stwu r0, -4(r1) /* clear final stack frame so that */
788 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
790 * Set up a dummy frame to store reset vector as return address.
791 * this causes stack underflow to reset board.
793 stwu r1, -8(r1) /* Save back chain and move SP */
794 lis r0, RESET_VECTOR@h /* Address of reset vector */
795 ori r0, r0, RESET_VECTOR@l
796 stwu r1, -8(r1) /* Save back chain and move SP */
797 stw r0, +12(r1) /* Save return addr (underflow vect) */
798 #endif /* !(CFG_INIT_DCACHE_CS || !CFG_TEM_STACK_OCM) */
800 GET_GOT /* initialize GOT access */
802 bl cpu_init_f /* run low-level CPU init code (from Flash) */
805 bl board_init_f /* run first part of init code (from Flash) */
807 #endif /* CONFIG_405GP || CONFIG_405CR || CONFIG_405 || CONFIG_405EP */
808 /*----------------------------------------------------------------------- */
811 /*****************************************************************************/
812 .globl _start_of_vectors
816 /*TODO Fixup _start above so we can do this*/
817 /* Critical input. */
818 CRIT_EXCEPTION(0x100, CritcalInput, CritcalInputException)
822 CRIT_EXCEPTION(0x200, MachineCheck, MachineCheckException)
824 /* Data Storage exception. */
825 STD_EXCEPTION(0x300, DataStorage, UnknownException)
827 /* Instruction Storage exception. */
828 STD_EXCEPTION(0x400, InstStorage, UnknownException)
830 /* External Interrupt exception. */
831 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
833 /* Alignment exception. */
841 addi r3,r1,STACK_FRAME_OVERHEAD
843 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
844 lwz r6,GOT(transfer_to_handler)
848 .long AlignmentException - _start + EXC_OFF_SYS_RESET
849 .long int_return - _start + EXC_OFF_SYS_RESET
851 /* Program check exception */
855 addi r3,r1,STACK_FRAME_OVERHEAD
857 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
858 lwz r6,GOT(transfer_to_handler)
862 .long ProgramCheckException - _start + EXC_OFF_SYS_RESET
863 .long int_return - _start + EXC_OFF_SYS_RESET
865 /* No FPU on MPC8xx. This exception is not supposed to happen.
867 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
869 /* I guess we could implement decrementer, and may have
870 * to someday for timekeeping.
872 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
873 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
874 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
875 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
876 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
878 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
879 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
881 /* On the MPC8xx, this is a software emulation interrupt. It occurs
882 * for all unimplemented and illegal instructions.
884 STD_EXCEPTION(0x1000, PIT, PITException)
886 STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
887 STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
888 STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException)
889 STD_EXCEPTION(0x1400, DataTLBError, UnknownException)
891 STD_EXCEPTION(0x1500, Reserved5, UnknownException)
892 STD_EXCEPTION(0x1600, Reserved6, UnknownException)
893 STD_EXCEPTION(0x1700, Reserved7, UnknownException)
894 STD_EXCEPTION(0x1800, Reserved8, UnknownException)
895 STD_EXCEPTION(0x1900, Reserved9, UnknownException)
896 STD_EXCEPTION(0x1a00, ReservedA, UnknownException)
897 STD_EXCEPTION(0x1b00, ReservedB, UnknownException)
899 STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException)
900 STD_EXCEPTION(0x1d00, InstructionBreakpoint, UnknownException)
901 STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException)
902 STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException)
904 CRIT_EXCEPTION(0x2000, DebugBreakpoint, DebugException )
906 .globl _end_of_vectors
913 * This code finishes saving the registers to the exception frame
914 * and jumps to the appropriate handler for the exception.
915 * Register r21 is pointer into trap frame, r1 has new stack pointer.
917 .globl transfer_to_handler
929 mfspr r23,SPRG3 /* if from user, fix up tss.regs */
931 addi r24,r1,STACK_FRAME_OVERHEAD
933 2: addi r2,r23,-TSS /* set r2 to current */
937 andi. r24,r23,0x3f00 /* get vector offset */
941 mtspr SPRG2,r22 /* r1 is now kernel sp */
943 addi r24,r2,TASK_STRUCT_SIZE /* check for kernel stack overflow */
947 bgt stack_ovf /* if r2 < r1 < r2+TASK_STRUCT_SIZE */
949 lwz r24,0(r23) /* virtual address of handler */
950 lwz r23,4(r23) /* where to go when done */
955 rfi /* jump to handler, enable MMU */
958 mfmsr r28 /* Disable interrupts */
962 SYNC /* Some chip revs need this... */
977 lwz r2,_NIP(r1) /* Restore environment */
988 mfmsr r28 /* Disable interrupts */
992 SYNC /* Some chip revs need this... */
1007 lwz r2,_NIP(r1) /* Restore environment */
1009 mtspr 990,r2 /* SRR2 */
1010 mtspr 991,r0 /* SRR3 */
1020 iccci r0,r0 /* for 405, iccci invalidates the */
1021 blr /* entire I cache */
1024 addi r6,0,0x0000 /* clear GPR 6 */
1025 /* Do loop for # of dcache congruence classes. */
1026 lis r7, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@ha /* TBS for large sized cache */
1027 ori r7, r7, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@l
1028 /* NOTE: dccci invalidates both */
1029 mtctr r7 /* ways in the D cache */
1031 dccci 0,r6 /* invalidate line */
1032 addi r6,r6, CFG_CACHELINE_SIZE /* bump to next line */
1037 addis r9,r0,0x0002 /* set mask for EE and CE msr bits */
1039 mfmsr r12 /* save msr */
1041 mtmsr r9 /* disable EE and CE */
1042 addi r10,r0,0x0001 /* enable data cache for unused memory */
1043 mfdccr r9 /* region 0xF8000000-0xFFFFFFFF via */
1044 or r10,r10,r9 /* bit 31 in dccr */
1047 /* do loop for # of congruence classes. */
1048 lis r10,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@ha /* TBS: for large cache sizes */
1049 ori r10,r10,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)@l
1050 lis r11,(CFG_DCACHE_SIZE / 2)@ha /* D cache set size - 2 way sets */
1051 ori r11,r11,(CFG_DCACHE_SIZE / 2)@l /* D cache set size - 2 way sets */
1053 addi r10,r0,(0xE000-0x10000) /* start at 0xFFFFE000 */
1054 add r11,r10,r11 /* add to get to other side of cache line */
1055 ..flush_dcache_loop:
1056 lwz r3,0(r10) /* least recently used side */
1057 lwz r3,0(r11) /* the other side */
1058 dccci r0,r11 /* invalidate both sides */
1059 addi r10,r10,CFG_CACHELINE_SIZE /* bump to next line */
1060 addi r11,r11,CFG_CACHELINE_SIZE /* bump to next line */
1061 bdnz ..flush_dcache_loop
1062 sync /* allow memory access to complete */
1063 mtdccr r9 /* restore dccr */
1064 mtmsr r12 /* restore msr */
1067 .globl icache_enable
1070 bl invalidate_icache
1073 addis r3,r0, 0x8000 /* set bit 0 */
1077 .globl icache_disable
1079 addis r3,r0, 0x0000 /* clear bit 0 */
1084 .globl icache_status
1087 srwi r3, r3, 31 /* >>31 => select bit 0 */
1090 .globl dcache_enable
1093 bl invalidate_dcache
1096 addis r3,r0, 0x8000 /* set bit 0 */
1100 .globl dcache_disable
1105 addis r3,r0, 0x0000 /* clear bit 0 */
1109 .globl dcache_status
1112 srwi r3, r3, 31 /* >>31 => select bit 0 */
1120 #if !defined(CONFIG_440)
1132 /*------------------------------------------------------------------------------- */
1134 /* Description: Input 8 bits */
1135 /*------------------------------------------------------------------------------- */
1141 /*------------------------------------------------------------------------------- */
1142 /* Function: out8 */
1143 /* Description: Output 8 bits */
1144 /*------------------------------------------------------------------------------- */
1150 /*------------------------------------------------------------------------------- */
1151 /* Function: out16 */
1152 /* Description: Output 16 bits */
1153 /*------------------------------------------------------------------------------- */
1159 /*------------------------------------------------------------------------------- */
1160 /* Function: out16r */
1161 /* Description: Byte reverse and output 16 bits */
1162 /*------------------------------------------------------------------------------- */
1168 /*------------------------------------------------------------------------------- */
1169 /* Function: out32 */
1170 /* Description: Output 32 bits */
1171 /*------------------------------------------------------------------------------- */
1177 /*------------------------------------------------------------------------------- */
1178 /* Function: out32r */
1179 /* Description: Byte reverse and output 32 bits */
1180 /*------------------------------------------------------------------------------- */
1186 /*------------------------------------------------------------------------------- */
1187 /* Function: in16 */
1188 /* Description: Input 16 bits */
1189 /*------------------------------------------------------------------------------- */
1195 /*------------------------------------------------------------------------------- */
1196 /* Function: in16r */
1197 /* Description: Input 16 bits and byte reverse */
1198 /*------------------------------------------------------------------------------- */
1204 /*------------------------------------------------------------------------------- */
1205 /* Function: in32 */
1206 /* Description: Input 32 bits */
1207 /*------------------------------------------------------------------------------- */
1213 /*------------------------------------------------------------------------------- */
1214 /* Function: in32r */
1215 /* Description: Input 32 bits and byte reverse */
1216 /*------------------------------------------------------------------------------- */
1222 /*------------------------------------------------------------------------------- */
1223 /* Function: ppcDcbf */
1224 /* Description: Data Cache block flush */
1225 /* Input: r3 = effective address */
1227 /*------------------------------------------------------------------------------- */
1233 /*------------------------------------------------------------------------------- */
1234 /* Function: ppcDcbi */
1235 /* Description: Data Cache block Invalidate */
1236 /* Input: r3 = effective address */
1238 /*------------------------------------------------------------------------------- */
1244 /*------------------------------------------------------------------------------- */
1245 /* Function: ppcSync */
1246 /* Description: Processor Synchronize */
1249 /*------------------------------------------------------------------------------- */
1255 /*------------------------------------------------------------------------------*/
1258 * void relocate_code (addr_sp, gd, addr_moni)
1260 * This "function" does not return, instead it continues in RAM
1261 * after relocating the monitor code.
1265 * r5 = length in bytes
1266 * r6 = cachelinesize
1268 .globl relocate_code
1270 #if defined(CONFIG_440EP) || defined(CONFIG_440GR) || defined(CONFIG_440SPE)
1272 * On some 440er platforms the cache is enabled in the first TLB (Boot-CS)
1273 * to speed up the boot process. Now this cache needs to be disabled.
1275 iccci 0,0 /* Invalidate inst cache */
1276 dccci 0,0 /* Invalidate data cache, now no longer our stack */
1279 addi r1,r0,0x0000 /* TLB entry #0 */
1280 tlbre r0,r1,0x0002 /* Read contents */
1281 ori r0,r0,0x0c00 /* Or in the inhibit, write through bit */
1282 tlbwe r0,r1,0x0002 /* Save it out */
1286 mr r1, r3 /* Set new stack pointer */
1287 mr r9, r4 /* Save copy of Init Data pointer */
1288 mr r10, r5 /* Save copy of Destination Address */
1290 mr r3, r5 /* Destination Address */
1291 lis r4, CFG_MONITOR_BASE@h /* Source Address */
1292 ori r4, r4, CFG_MONITOR_BASE@l
1293 lwz r5, GOT(__init_end)
1295 li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
1300 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
1306 /* First our own GOT */
1308 /* the the one used by the C code */
1318 beq cr1,4f /* In place copy is not necessary */
1319 beq 7f /* Protect against 0 count */
1338 * Now flush the cache: note that we must start from a cache aligned
1339 * address. Otherwise we might miss one cache line.
1343 beq 7f /* Always flush prefetch queue in any case */
1351 sync /* Wait for all dcbst to complete on bus */
1357 7: sync /* Wait for all icbi to complete on bus */
1361 * We are done. Do not return, instead branch to second part of board
1362 * initialization, now running from RAM.
1365 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
1367 blr /* NEVER RETURNS! */
1372 * Relocation Function, r14 point to got2+0x8000
1374 * Adjust got2 pointers, no need to check for 0, this code
1375 * already puts a few entries in the table.
1377 li r0,__got2_entries@sectoff@l
1378 la r3,GOT(_GOT2_TABLE_)
1379 lwz r11,GOT(_GOT2_TABLE_)
1389 * Now adjust the fixups and the pointers to the fixups
1390 * in case we need to move ourselves again.
1392 2: li r0,__fixup_entries@sectoff@l
1393 lwz r3,GOT(_FIXUP_TABLE_)
1407 * Now clear BSS segment
1409 lwz r3,GOT(__bss_start)
1423 mr r3, r9 /* Init Data pointer */
1424 mr r4, r10 /* Destination Address */
1428 * Copy exception vector code to low memory
1431 * r7: source address, r8: end address, r9: target address
1436 lwz r8, GOT(_end_of_vectors)
1438 li r9, 0x100 /* reset vector always at 0x100 */
1441 bgelr /* return if r7>=r8 - just in case */
1443 mflr r4 /* save link register */
1453 * relocate `hdlr' and `int_return' entries
1455 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1456 li r8, Alignment - _start + EXC_OFF_SYS_RESET
1459 addi r7, r7, 0x100 /* next exception vector */
1463 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1466 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1469 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1470 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
1473 addi r7, r7, 0x100 /* next exception vector */
1477 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
1478 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1481 addi r7, r7, 0x100 /* next exception vector */
1485 #if !defined(CONFIG_440GX) && !defined(CONFIG_440SPE)
1486 addi r7,r0,0x1000 /* set ME bit (Machine Exceptions) */
1487 oris r7,r7,0x0002 /* set CE bit (Critical Exceptions) */
1488 mtmsr r7 /* change MSR */
1491 b __440gx_msr_continue
1494 addi r7,r0,0x1000 /* set ME bit (Machine Exceptions) */
1495 oris r7,r7,0x0002 /* set CE bit (Critical Exceptions) */
1500 __440gx_msr_continue:
1503 mtlr r4 /* restore link register */
1507 * Function: relocate entries for one exception vector
1510 lwz r0, 0(r7) /* hdlr ... */
1511 add r0, r0, r3 /* ... += dest_addr */
1514 lwz r0, 4(r7) /* int_return ... */
1515 add r0, r0, r3 /* ... += dest_addr */
1521 /**************************************************************************/
1522 /* PPC405EP specific stuff */
1523 /**************************************************************************/
1527 #ifdef CONFIG_BUBINGA
1529 * Initialize EBC chip selects 1 & 4 and GPIO pins (for alternate
1530 * function) to support FPGA and NVRAM accesses below.
1533 lis r3,GPIO0_OSRH@h /* config GPIO output select */
1534 ori r3,r3,GPIO0_OSRH@l
1535 lis r4,CFG_GPIO0_OSRH@h
1536 ori r4,r4,CFG_GPIO0_OSRH@l
1539 ori r3,r3,GPIO0_OSRL@l
1540 lis r4,CFG_GPIO0_OSRL@h
1541 ori r4,r4,CFG_GPIO0_OSRL@l
1544 lis r3,GPIO0_ISR1H@h /* config GPIO input select */
1545 ori r3,r3,GPIO0_ISR1H@l
1546 lis r4,CFG_GPIO0_ISR1H@h
1547 ori r4,r4,CFG_GPIO0_ISR1H@l
1549 lis r3,GPIO0_ISR1L@h
1550 ori r3,r3,GPIO0_ISR1L@l
1551 lis r4,CFG_GPIO0_ISR1L@h
1552 ori r4,r4,CFG_GPIO0_ISR1L@l
1555 lis r3,GPIO0_TSRH@h /* config GPIO three-state select */
1556 ori r3,r3,GPIO0_TSRH@l
1557 lis r4,CFG_GPIO0_TSRH@h
1558 ori r4,r4,CFG_GPIO0_TSRH@l
1561 ori r3,r3,GPIO0_TSRL@l
1562 lis r4,CFG_GPIO0_TSRL@h
1563 ori r4,r4,CFG_GPIO0_TSRL@l
1566 lis r3,GPIO0_TCR@h /* config GPIO driver output enables */
1567 ori r3,r3,GPIO0_TCR@l
1568 lis r4,CFG_GPIO0_TCR@h
1569 ori r4,r4,CFG_GPIO0_TCR@l
1572 li r3,pb1ap /* program EBC bank 1 for RTC access */
1574 lis r3,CFG_EBC_PB1AP@h
1575 ori r3,r3,CFG_EBC_PB1AP@l
1579 lis r3,CFG_EBC_PB1CR@h
1580 ori r3,r3,CFG_EBC_PB1CR@l
1583 li r3,pb1ap /* program EBC bank 1 for RTC access */
1585 lis r3,CFG_EBC_PB1AP@h
1586 ori r3,r3,CFG_EBC_PB1AP@l
1590 lis r3,CFG_EBC_PB1CR@h
1591 ori r3,r3,CFG_EBC_PB1CR@l
1594 li r3,pb4ap /* program EBC bank 4 for FPGA access */
1596 lis r3,CFG_EBC_PB4AP@h
1597 ori r3,r3,CFG_EBC_PB4AP@l
1601 lis r3,CFG_EBC_PB4CR@h
1602 ori r3,r3,CFG_EBC_PB4CR@l
1606 addi r3,0,CPC0_PCI_HOST_CFG_EN
1607 #ifdef CONFIG_BUBINGA
1609 !-----------------------------------------------------------------------
1610 ! Check FPGA for PCI internal/external arbitration
1611 ! If board is set to internal arbitration, update cpc0_pci
1612 !-----------------------------------------------------------------------
1614 addis r5,r0,FPGA_REG1@h /* set offset for FPGA_REG1 */
1615 ori r5,r5,FPGA_REG1@l
1616 lbz r5,0x0(r5) /* read to get PCI arb selection */
1617 andi. r6,r5,FPGA_REG1_PCI_INT_ARB /* using internal arbiter ?*/
1618 beq ..pci_cfg_set /* if not set, then bypass reg write*/
1620 ori r3,r3,CPC0_PCI_ARBIT_EN
1622 mtdcr CPC0_PCI, r3 /* Enable internal arbiter*/
1625 !-----------------------------------------------------------------------
1626 ! Check to see if chip is in bypass mode.
1627 ! If so, write stored CPC0_PLLMR0 and CPC0_PLLMR1 values and perform a
1628 ! CPU reset Otherwise, skip this step and keep going.
1629 ! Note: Running BIOS in bypass mode is not supported since PLB speed
1630 ! will not be fast enough for the SDRAM (min 66MHz)
1631 !-----------------------------------------------------------------------
1633 mfdcr r5, CPC0_PLLMR1
1634 rlwinm r4,r5,1,0x1 /* get system clock source (SSCS) */
1637 beq pll_done /* if SSCS =b'1' then PLL has */
1638 /* already been set */
1639 /* and CPU has been reset */
1640 /* so skip to next section */
1642 #ifdef CONFIG_BUBINGA
1644 !-----------------------------------------------------------------------
1645 ! Read NVRAM to get value to write in PLLMR.
1646 ! If value has not been correctly saved, write default value
1647 ! Default config values (assuming on-board 33MHz SYS_CLK) are above.
1648 ! See CPU_DEFAULT_200 and CPU_DEFAULT_266 above.
1650 ! WARNING: This code assumes the first three words in the nvram_t
1651 ! structure in openbios.h. Changing the beginning of
1652 ! the structure will break this code.
1654 !-----------------------------------------------------------------------
1656 addis r3,0,NVRAM_BASE@h
1657 addi r3,r3,NVRAM_BASE@l
1660 addis r5,0,NVRVFY1@h
1661 addi r5,r5,NVRVFY1@l
1662 cmp cr0,0,r4,r5 /* Compare 1st NVRAM Magic number*/
1666 addis r5,0,NVRVFY2@h
1667 addi r5,r5,NVRVFY2@l
1668 cmp cr0,0,r4,r5 /* Compare 2 NVRAM Magic number */
1670 addi r3,r3,8 /* Skip over conf_size */
1671 lwz r4, 4(r3) /* Load PLLMR1 value from NVRAM */
1672 lwz r3, 0(r3) /* Load PLLMR0 value from NVRAM */
1673 rlwinm r5,r4,1,0x1 /* get system clock source (SSCS) */
1674 cmpi cr0,0,r5,1 /* See if PLL is locked */
1677 #endif /* CONFIG_BUBINGA */
1679 addis r3,0,PLLMR0_DEFAULT@h /* PLLMR0 default value */
1680 ori r3,r3,PLLMR0_DEFAULT@l /* */
1681 addis r4,0,PLLMR1_DEFAULT@h /* PLLMR1 default value */
1682 ori r4,r4,PLLMR1_DEFAULT@l /* */
1684 b pll_write /* Write the CPC0_PLLMR with new value */
1688 !-----------------------------------------------------------------------
1689 ! Clear Soft Reset Register
1690 ! This is needed to enable PCI if not booting from serial EPROM
1691 !-----------------------------------------------------------------------
1701 blr /* return to main code */
1704 !-----------------------------------------------------------------------------
1705 ! Function: pll_write
1706 ! Description: Updates the value of the CPC0_PLLMR according to CMOS27E documentation
1708 ! 1. Pll is first disabled (de-activated by putting in bypass mode)
1710 ! 3. Clock dividers are set while PLL is held in reset and bypassed
1711 ! 4. PLL Reset is cleared
1712 ! 5. Wait 100us for PLL to lock
1713 ! 6. A core reset is performed
1714 ! Input: r3 = Value to write to CPC0_PLLMR0
1715 ! Input: r4 = Value to write to CPC0_PLLMR1
1717 !-----------------------------------------------------------------------------
1722 ori r5,r5,0x0101 /* Stop the UART clocks */
1723 mtdcr CPC0_UCR,r5 /* Before changing PLL */
1725 mfdcr r5, CPC0_PLLMR1
1726 rlwinm r5,r5,0,0x7FFFFFFF /* Disable PLL */
1727 mtdcr CPC0_PLLMR1,r5
1728 oris r5,r5,0x4000 /* Set PLL Reset */
1729 mtdcr CPC0_PLLMR1,r5
1731 mtdcr CPC0_PLLMR0,r3 /* Set clock dividers */
1732 rlwinm r5,r4,0,0x3FFFFFFF /* Reset & Bypass new PLL dividers */
1733 oris r5,r5,0x4000 /* Set PLL Reset */
1734 mtdcr CPC0_PLLMR1,r5 /* Set clock dividers */
1735 rlwinm r5,r5,0,0xBFFFFFFF /* Clear PLL Reset */
1736 mtdcr CPC0_PLLMR1,r5
1739 ! Wait min of 100us for PLL to lock.
1740 ! See CMOS 27E databook for more info.
1741 ! At 200MHz, that means waiting 20,000 instructions
1743 addi r3,0,20000 /* 2000 = 0x4e20 */
1748 oris r5,r5,0x8000 /* Enable PLL */
1749 mtdcr CPC0_PLLMR1,r5 /* Engage */
1752 * Reset CPU to guarantee timings are OK
1753 * Not sure if this is needed...
1756 mtspr dbcr0,r3 /* This will cause a CPU core reset, and */
1757 /* execution will continue from the poweron */
1758 /* vector of 0xfffffffc */
1759 #endif /* CONFIG_405EP */