3 * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
5 * Copyright Freescale Semiconductor, Inc. 2004, 2006, 2008.
7 * SPDX-License-Identifier: GPL-2.0+
11 * U-Boot - Startup Code for MPC83xx PowerPC based Embedded Boards
14 #include <asm-offsets.h>
19 #define CONFIG_83XX 1 /* needed for Linux kernel header files*/
21 #include <ppc_asm.tmpl>
24 #include <asm/cache.h>
26 #include <asm/u-boot.h>
28 /* We don't want the MMU yet.
33 * Floating Point enable, Machine Check and Recoverable Interr.
36 #define MSR_KERNEL (MSR_FP|MSR_RI)
38 #define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
41 #if defined(CONFIG_NAND_SPL) || \
42 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_INIT_MINIMAL))
46 #if !defined(CONFIG_SPL_BUILD) && !defined(CONFIG_NAND_SPL) && \
47 !defined(CONFIG_SYS_RAMBOOT)
48 #define CONFIG_SYS_FLASHBOOT
52 * Set up GOT: Global Offset Table
54 * Use r12 to access the GOT
57 GOT_ENTRY(_GOT2_TABLE_)
58 GOT_ENTRY(__bss_start)
62 GOT_ENTRY(_FIXUP_TABLE_)
64 GOT_ENTRY(_start_of_vectors)
65 GOT_ENTRY(_end_of_vectors)
66 GOT_ENTRY(transfer_to_handler)
71 * The Hard Reset Configuration Word (HRCW) table is in the first 64
72 * (0x40) bytes of flash. It has 8 bytes, but each byte is repeated 8
73 * times so the processor can fetch it out of flash whether the flash
74 * is 8, 16, 32, or 64 bits wide (hardware trickery).
77 #define _HRCW_TABLE_ENTRY(w) \
78 .fill 8,1,(((w)>>24)&0xff); \
79 .fill 8,1,(((w)>>16)&0xff); \
80 .fill 8,1,(((w)>> 8)&0xff); \
81 .fill 8,1,(((w) )&0xff)
83 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_LOW)
84 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_HIGH)
87 * Magic number and version string - put it after the HRCW since it
88 * cannot be first in flash like it is in many other processors.
90 .long 0x27051956 /* U-Boot Magic Number */
94 .ascii U_BOOT_VERSION_STRING, "\0"
98 .globl enable_addr_trans
100 /* enable address translation */
102 ori r5, r5, (MSR_IR | MSR_DR)
107 .globl disable_addr_trans
109 /* disable address translation */
112 andi. r0, r3, (MSR_IR | MSR_DR)
141 #ifndef CONFIG_DEFAULT_IMMR
142 #error CONFIG_DEFAULT_IMMR must be defined
143 #endif /* CONFIG_SYS_DEFAULT_IMMR */
144 #ifndef CONFIG_SYS_IMMR
145 #define CONFIG_SYS_IMMR CONFIG_DEFAULT_IMMR
146 #endif /* CONFIG_SYS_IMMR */
149 * After configuration, a system reset exception is executed using the
150 * vector at offset 0x100 relative to the base set by MSR[IP]. If
151 * MSR[IP] is 0, the base address is 0x00000000. If MSR[IP] is 1, the
152 * base address is 0xfff00000. In the case of a Power On Reset or Hard
153 * Reset, the value of MSR[IP] is determined by the CIP field in the
156 * Other bits in the HRCW set up the Base Address and Port Size in BR0.
157 * This determines the location of the boot ROM (flash or EPROM) in the
158 * processor's address space at boot time. As long as the HRCW is set up
159 * so that we eventually end up executing the code below when the
160 * processor executes the reset exception, the actual values used should
163 * Once we have got here, the address mask in OR0 is cleared so that the
164 * bottom 32K of the boot ROM is effectively repeated all throughout the
165 * processor's address space, after which we can jump to the absolute
166 * address at which the boot ROM was linked at compile time, and proceed
167 * to initialise the memory controller without worrying if the rug will
168 * be pulled out from under us, so to speak (it will be fine as long as
169 * we configure BR0 with the same boot ROM link address).
171 . = EXC_OFF_SYS_RESET
174 _start: /* time t 0 */
175 lis r4, CONFIG_DEFAULT_IMMR@h
178 mfmsr r5 /* save msr contents */
180 /* 83xx manuals prescribe a specific sequence for updating IMMRBAR. */
184 lis r3, CONFIG_SYS_IMMR@h
185 ori r3, r3, CONFIG_SYS_IMMR@l
191 lwz r6, 0(r7) /* Arbitrary external load */
197 /* Initialise the E300 processor core */
198 /*------------------------------------------*/
200 #if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_MPC83XX_WAIT_FOR_NAND)) || \
201 defined(CONFIG_NAND_SPL)
202 /* The FCM begins execution after only the first page
203 * is loaded. Wait for the rest before branching
204 * to another flash page.
206 1: lwz r6, 0x50b0(r3)
213 #ifdef CONFIG_SYS_FLASHBOOT
215 /* Inflate flash location so it appears everywhere, calculate */
216 /* the absolute address in final location of the FLASH, jump */
217 /* there and deflate the flash size back to minimal size */
218 /*------------------------------------------------------------*/
220 lis r4, (CONFIG_SYS_MONITOR_BASE)@h
221 ori r4, r4, (CONFIG_SYS_MONITOR_BASE)@l
222 addi r5, r4, in_flash - _start + EXC_OFF_SYS_RESET
226 #if 1 /* Remapping flash with LAW0. */
227 bl remap_flash_by_law0
229 #endif /* CONFIG_SYS_FLASHBOOT */
236 * Cache must be enabled here for stack-in-cache trick.
237 * This means we need to enable the BATS.
239 * 1) for the EVB, original gt regs need to be mapped
240 * 2) need to have an IBAT for the 0xf region,
241 * we are running there!
242 * Cache should be turned on after BATs, since by default
243 * everything is write-through.
244 * The init-mem BAT can be reused after reloc. The old
245 * gt-regs BAT can be reused after board_init_f calls
246 * board_early_init_f (EVB only).
248 /* enable address translation */
252 /* enable the data cache */
255 #ifdef CONFIG_SYS_INIT_RAM_LOCK
260 /* set up the stack pointer in our newly created
262 lis r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@h
263 ori r1, r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@l
265 li r0, 0 /* Make room for stack frame header and */
266 stwu r0, -4(r1) /* clear final stack frame so that */
267 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
270 /* let the C-code set up the rest */
272 /* Be careful to keep code relocatable & stack humble */
273 /*------------------------------------------------------*/
275 GET_GOT /* initialize GOT access */
278 lis r3, CONFIG_SYS_IMMR@h
279 /* run low-level CPU init code (in Flash)*/
282 /* run 1st part of board init code (in Flash)*/
283 li r3, 0 /* clear boot_flag for calling board_init_f */
286 /* NOTREACHED - board_init_f() does not return */
293 .globl _start_of_vectors
297 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
299 /* Data Storage exception. */
300 STD_EXCEPTION(0x300, DataStorage, UnknownException)
302 /* Instruction Storage exception. */
303 STD_EXCEPTION(0x400, InstStorage, UnknownException)
305 /* External Interrupt exception. */
307 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
310 /* Alignment exception. */
313 EXCEPTION_PROLOG(SRR0, SRR1)
318 addi r3,r1,STACK_FRAME_OVERHEAD
319 EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
321 /* Program check exception */
324 EXCEPTION_PROLOG(SRR0, SRR1)
325 addi r3,r1,STACK_FRAME_OVERHEAD
326 EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
329 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
331 /* I guess we could implement decrementer, and may have
332 * to someday for timekeeping.
334 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
336 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
337 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
338 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
339 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
341 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
342 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
344 STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
345 STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
346 STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
350 * This exception occurs when the program counter matches the
351 * Instruction Address Breakpoint Register (IABR).
353 * I want the cpu to halt if this occurs so I can hunt around
354 * with the debugger and look at things.
356 * When DEBUG is defined, both machine check enable (in the MSR)
357 * and checkstop reset enable (in the reset mode register) are
358 * turned off and so a checkstop condition will result in the cpu
361 * I force the cpu into a checkstop condition by putting an illegal
362 * instruction here (at least this is the theory).
364 * well - that didnt work, so just do an infinite loop!
368 STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
370 STD_EXCEPTION(0x1400, SMI, UnknownException)
372 STD_EXCEPTION(0x1500, Trap_15, UnknownException)
373 STD_EXCEPTION(0x1600, Trap_16, UnknownException)
374 STD_EXCEPTION(0x1700, Trap_17, UnknownException)
375 STD_EXCEPTION(0x1800, Trap_18, UnknownException)
376 STD_EXCEPTION(0x1900, Trap_19, UnknownException)
377 STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
378 STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
379 STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
380 STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
381 STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
382 STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
383 STD_EXCEPTION(0x2000, Trap_20, UnknownException)
384 STD_EXCEPTION(0x2100, Trap_21, UnknownException)
385 STD_EXCEPTION(0x2200, Trap_22, UnknownException)
386 STD_EXCEPTION(0x2300, Trap_23, UnknownException)
387 STD_EXCEPTION(0x2400, Trap_24, UnknownException)
388 STD_EXCEPTION(0x2500, Trap_25, UnknownException)
389 STD_EXCEPTION(0x2600, Trap_26, UnknownException)
390 STD_EXCEPTION(0x2700, Trap_27, UnknownException)
391 STD_EXCEPTION(0x2800, Trap_28, UnknownException)
392 STD_EXCEPTION(0x2900, Trap_29, UnknownException)
393 STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
394 STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
395 STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
396 STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
397 STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
398 STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
401 .globl _end_of_vectors
407 * This code finishes saving the registers to the exception frame
408 * and jumps to the appropriate handler for the exception.
409 * Register r21 is pointer into trap frame, r1 has new stack pointer.
411 .globl transfer_to_handler
422 andi. r24,r23,0x3f00 /* get vector offset */
426 lwz r24,0(r23) /* virtual address of handler */
427 lwz r23,4(r23) /* where to go when done */
432 rfi /* jump to handler, enable MMU */
435 mfmsr r28 /* Disable interrupts */
439 SYNC /* Some chip revs need this... */
454 lwz r2,_NIP(r1) /* Restore environment */
463 #endif /* !MINIMAL_SPL */
466 * This code initialises the E300 processor core
467 * (conforms to PowerPC 603e spec)
468 * Note: expects original MSR contents to be in r5.
470 .globl init_e300_core
471 init_e300_core: /* time t 10 */
472 /* Initialize machine status; enable machine check interrupt */
473 /*-----------------------------------------------------------*/
475 li r3, MSR_KERNEL /* Set ME and RI flags */
476 rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */
478 rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */
480 SYNC /* Some chip revs need this... */
483 mtspr SRR1, r3 /* Make SRR1 match MSR */
486 lis r3, CONFIG_SYS_IMMR@h
487 #if defined(CONFIG_WATCHDOG)
488 /* Initialise the Watchdog values and reset it (if req) */
489 /*------------------------------------------------------*/
490 lis r4, CONFIG_SYS_WATCHDOG_VALUE
491 ori r4, r4, (SWCRR_SWEN | SWCRR_SWRI | SWCRR_SWPR)
501 /* Disable Watchdog */
502 /*-------------------*/
504 /* Check to see if its enabled for disabling
505 once disabled by SW you can't re-enable */
511 #endif /* CONFIG_WATCHDOG */
513 #if defined(CONFIG_MASK_AER_AO)
514 /* Write the Arbiter Event Enable to mask Address Only traps. */
515 /* This prevents the dcbz instruction from being trapped when */
516 /* HID0_ABE Address Broadcast Enable is set and the MEMORY */
517 /* COHERENCY bit is set in the WIMG bits, which is often */
518 /* needed for PCI operation. */
520 rlwinm r0, r4, 0, ~AER_AO
522 #endif /* CONFIG_MASK_AER_AO */
524 /* Initialize the Hardware Implementation-dependent Registers */
525 /* HID0 also contains cache control */
526 /* - force invalidation of data and instruction caches */
527 /*------------------------------------------------------*/
529 lis r3, CONFIG_SYS_HID0_INIT@h
530 ori r3, r3, (CONFIG_SYS_HID0_INIT | HID0_ICFI | HID0_DCFI)@l
534 lis r3, CONFIG_SYS_HID0_FINAL@h
535 ori r3, r3, (CONFIG_SYS_HID0_FINAL & ~(HID0_ICFI | HID0_DCFI))@l
539 lis r3, CONFIG_SYS_HID2@h
540 ori r3, r3, CONFIG_SYS_HID2@l
545 /*------------------------------*/
548 /* setup_bats - set them up to some initial state */
554 addis r4, r0, CONFIG_SYS_IBAT0L@h
555 ori r4, r4, CONFIG_SYS_IBAT0L@l
556 addis r3, r0, CONFIG_SYS_IBAT0U@h
557 ori r3, r3, CONFIG_SYS_IBAT0U@l
562 addis r4, r0, CONFIG_SYS_DBAT0L@h
563 ori r4, r4, CONFIG_SYS_DBAT0L@l
564 addis r3, r0, CONFIG_SYS_DBAT0U@h
565 ori r3, r3, CONFIG_SYS_DBAT0U@l
570 addis r4, r0, CONFIG_SYS_IBAT1L@h
571 ori r4, r4, CONFIG_SYS_IBAT1L@l
572 addis r3, r0, CONFIG_SYS_IBAT1U@h
573 ori r3, r3, CONFIG_SYS_IBAT1U@l
578 addis r4, r0, CONFIG_SYS_DBAT1L@h
579 ori r4, r4, CONFIG_SYS_DBAT1L@l
580 addis r3, r0, CONFIG_SYS_DBAT1U@h
581 ori r3, r3, CONFIG_SYS_DBAT1U@l
586 addis r4, r0, CONFIG_SYS_IBAT2L@h
587 ori r4, r4, CONFIG_SYS_IBAT2L@l
588 addis r3, r0, CONFIG_SYS_IBAT2U@h
589 ori r3, r3, CONFIG_SYS_IBAT2U@l
594 addis r4, r0, CONFIG_SYS_DBAT2L@h
595 ori r4, r4, CONFIG_SYS_DBAT2L@l
596 addis r3, r0, CONFIG_SYS_DBAT2U@h
597 ori r3, r3, CONFIG_SYS_DBAT2U@l
602 addis r4, r0, CONFIG_SYS_IBAT3L@h
603 ori r4, r4, CONFIG_SYS_IBAT3L@l
604 addis r3, r0, CONFIG_SYS_IBAT3U@h
605 ori r3, r3, CONFIG_SYS_IBAT3U@l
610 addis r4, r0, CONFIG_SYS_DBAT3L@h
611 ori r4, r4, CONFIG_SYS_DBAT3L@l
612 addis r3, r0, CONFIG_SYS_DBAT3U@h
613 ori r3, r3, CONFIG_SYS_DBAT3U@l
617 #ifdef CONFIG_HIGH_BATS
619 addis r4, r0, CONFIG_SYS_IBAT4L@h
620 ori r4, r4, CONFIG_SYS_IBAT4L@l
621 addis r3, r0, CONFIG_SYS_IBAT4U@h
622 ori r3, r3, CONFIG_SYS_IBAT4U@l
627 addis r4, r0, CONFIG_SYS_DBAT4L@h
628 ori r4, r4, CONFIG_SYS_DBAT4L@l
629 addis r3, r0, CONFIG_SYS_DBAT4U@h
630 ori r3, r3, CONFIG_SYS_DBAT4U@l
635 addis r4, r0, CONFIG_SYS_IBAT5L@h
636 ori r4, r4, CONFIG_SYS_IBAT5L@l
637 addis r3, r0, CONFIG_SYS_IBAT5U@h
638 ori r3, r3, CONFIG_SYS_IBAT5U@l
643 addis r4, r0, CONFIG_SYS_DBAT5L@h
644 ori r4, r4, CONFIG_SYS_DBAT5L@l
645 addis r3, r0, CONFIG_SYS_DBAT5U@h
646 ori r3, r3, CONFIG_SYS_DBAT5U@l
651 addis r4, r0, CONFIG_SYS_IBAT6L@h
652 ori r4, r4, CONFIG_SYS_IBAT6L@l
653 addis r3, r0, CONFIG_SYS_IBAT6U@h
654 ori r3, r3, CONFIG_SYS_IBAT6U@l
659 addis r4, r0, CONFIG_SYS_DBAT6L@h
660 ori r4, r4, CONFIG_SYS_DBAT6L@l
661 addis r3, r0, CONFIG_SYS_DBAT6U@h
662 ori r3, r3, CONFIG_SYS_DBAT6U@l
667 addis r4, r0, CONFIG_SYS_IBAT7L@h
668 ori r4, r4, CONFIG_SYS_IBAT7L@l
669 addis r3, r0, CONFIG_SYS_IBAT7U@h
670 ori r3, r3, CONFIG_SYS_IBAT7U@l
675 addis r4, r0, CONFIG_SYS_DBAT7L@h
676 ori r4, r4, CONFIG_SYS_DBAT7L@l
677 addis r3, r0, CONFIG_SYS_DBAT7U@h
678 ori r3, r3, CONFIG_SYS_DBAT7U@l
685 /* invalidate all tlb's
687 * From the 603e User Manual: "The 603e provides the ability to
688 * invalidate a TLB entry. The TLB Invalidate Entry (tlbie)
689 * instruction invalidates the TLB entry indexed by the EA, and
690 * operates on both the instruction and data TLBs simultaneously
691 * invalidating four TLB entries (both sets in each TLB). The
692 * index corresponds to bits 15-19 of the EA. To invalidate all
693 * entries within both TLBs, 32 tlbie instructions should be
694 * issued, incrementing this field by one each time."
696 * "Note that the tlbia instruction is not implemented on the
699 * bits 15-19 correspond to addresses 0x00000000 to 0x0001F000
700 * incrementing by 0x1000 each time. The code below is sort of
701 * based on code in "flush_tlbs" from arch/powerpc/kernel/head.S
717 * Note: requires that all cache bits in
718 * HID0 are in the low half word.
725 li r4, HID0_ICFI|HID0_ILOCK
727 ori r4, r3, HID0_ICFI
729 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
731 mtspr HID0, r3 /* clears invalidate */
734 .globl icache_disable
738 ori r4, r4, HID0_ICE|HID0_ICFI|HID0_ILOCK
741 mtspr HID0, r3 /* clears invalidate, enable and lock */
747 rlwinm r3, r3, (31 - HID0_ICE_SHIFT + 1), 31, 31
749 #endif /* !MINIMAL_SPL */
754 li r5, HID0_DCFI|HID0_DLOCK
758 mtspr HID0, r3 /* enable, no invalidate */
761 .globl dcache_disable
764 bl flush_dcache /* uses r3 and r5 */
766 li r5, HID0_DCE|HID0_DLOCK
768 ori r5, r3, HID0_DCFI
770 mtspr HID0, r5 /* sets invalidate, clears enable and lock */
772 mtspr HID0, r3 /* clears invalidate */
779 rlwinm r3, r3, (31 - HID0_DCE_SHIFT + 1), 31, 31
785 lis r5, CONFIG_SYS_CACHELINE_SIZE
789 lis r5, CONFIG_SYS_CACHELINE_SIZE
794 /*-------------------------------------------------------------------*/
797 * void relocate_code (addr_sp, gd, addr_moni)
799 * This "function" does not return, instead it continues in RAM
800 * after relocating the monitor code.
804 * r5 = length in bytes
809 mr r1, r3 /* Set new stack pointer */
810 mr r9, r4 /* Save copy of Global Data pointer */
811 mr r10, r5 /* Save copy of Destination Address */
814 mr r3, r5 /* Destination Address */
815 lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
816 ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
817 lwz r5, GOT(__bss_start)
819 li r6, CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */
824 * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE)
825 * + Destination Address
831 /* First our own GOT */
833 /* then the one used by the C code */
843 beq cr1,4f /* In place copy is not necessary */
844 beq 7f /* Protect against 0 count */
873 2: slwi r0,r0,2 /* re copy in reverse order ... y do we needed it? */
881 * Now flush the cache: note that we must start from a cache aligned
882 * address. Otherwise we might miss one cache line.
886 beq 7f /* Always flush prefetch queue in any case */
894 sync /* Wait for all dcbst to complete on bus */
900 7: sync /* Wait for all icbi to complete on bus */
904 * We are done. Do not return, instead branch to second part of board
905 * initialization, now running from RAM.
907 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
914 * Relocation Function, r12 point to got2+0x8000
916 * Adjust got2 pointers, no need to check for 0, this code
917 * already puts a few entries in the table.
919 li r0,__got2_entries@sectoff@l
920 la r3,GOT(_GOT2_TABLE_)
921 lwz r11,GOT(_GOT2_TABLE_)
934 * Now adjust the fixups and the pointers to the fixups
935 * in case we need to move ourselves again.
937 li r0,__fixup_entries@sectoff@l
938 lwz r3,GOT(_FIXUP_TABLE_)
956 * Now clear BSS segment
958 lwz r3,GOT(__bss_start)
959 lwz r4,GOT(__bss_end)
972 mr r3, r9 /* Global Data pointer */
973 mr r4, r10 /* Destination Address */
978 * Copy exception vector code to low memory
981 * r7: source address, r8: end address, r9: target address
985 mflr r4 /* save link register */
988 lwz r8, GOT(_end_of_vectors)
990 li r9, 0x100 /* reset vector always at 0x100 */
993 bgelr /* return if r7>=r8 - just in case */
1003 * relocate `hdlr' and `int_return' entries
1005 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1006 li r8, Alignment - _start + EXC_OFF_SYS_RESET
1009 addi r7, r7, 0x100 /* next exception vector */
1013 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1016 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1019 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1020 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
1023 addi r7, r7, 0x100 /* next exception vector */
1027 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
1028 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1031 addi r7, r7, 0x100 /* next exception vector */
1035 mfmsr r3 /* now that the vectors have */
1036 lis r7, MSR_IP@h /* relocated into low memory */
1037 ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */
1038 andc r3, r3, r7 /* (if it was on) */
1039 SYNC /* Some chip revs need this... */
1043 mtlr r4 /* restore link register */
1046 #endif /* !MINIMAL_SPL */
1048 #ifdef CONFIG_SYS_INIT_RAM_LOCK
1050 /* Allocate Initial RAM in data cache.
1052 lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
1053 ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
1054 li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \
1055 (CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
1062 /* Lock the data cache */
1064 ori r0, r0, HID0_DLOCK
1071 .globl unlock_ram_in_cache
1072 unlock_ram_in_cache:
1073 /* invalidate the INIT_RAM section */
1074 lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
1075 ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
1076 li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \
1077 (CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
1083 sync /* Wait for all icbi to complete on bus */
1086 /* Unlock the data cache and invalidate it */
1088 li r5, HID0_DLOCK|HID0_DCFI
1089 andc r3, r3, r5 /* no invalidate, unlock */
1090 ori r5, r3, HID0_DCFI /* invalidate, unlock */
1092 mtspr HID0, r5 /* invalidate, unlock */
1094 mtspr HID0, r3 /* no invalidate, unlock */
1096 #endif /* !MINIMAL_SPL */
1097 #endif /* CONFIG_SYS_INIT_RAM_LOCK */
1099 #ifdef CONFIG_SYS_FLASHBOOT
1101 /* When booting from ROM (Flash or EPROM), clear the */
1102 /* Address Mask in OR0 so ROM appears everywhere */
1103 /*----------------------------------------------------*/
1104 lis r3, (CONFIG_SYS_IMMR)@h /* r3 <= CONFIG_SYS_IMMR */
1106 li r5, 0x7fff /* r5 <= 0x00007FFFF */
1108 stw r4, OR0@l(r3) /* OR0 <= OR0 & 0x00007FFFF */
1110 /* As MPC8349E User's Manual presented, when RCW[BMS] is set to 0,
1111 * system will boot from 0x0000_0100, and the LBLAWBAR0[BASE_ADDR]
1112 * reset value is 0x00000; when RCW[BMS] is set to 1, system will boot
1113 * from 0xFFF0_0100, and the LBLAWBAR0[BASE_ADDR] reset value is
1114 * 0xFF800. From the hard resetting to here, the processor fetched and
1115 * executed the instructions one by one. There is not absolutely
1116 * jumping happened. Laterly, the u-boot code has to do an absolutely
1117 * jumping to tell the CPU instruction fetching component what the
1118 * u-boot TEXT base address is. Because the TEXT base resides in the
1119 * boot ROM memory space, to garantee the code can run smoothly after
1120 * that jumping, we must map in the entire boot ROM by Local Access
1121 * Window. Sometimes, we desire an non-0x00000 or non-0xFF800 starting
1122 * address for boot ROM, such as 0xFE000000. In this case, the default
1123 * LBIU Local Access Widow 0 will not cover this memory space. So, we
1124 * need another window to map in it.
1126 lis r4, (CONFIG_SYS_FLASH_BASE)@h
1127 ori r4, r4, (CONFIG_SYS_FLASH_BASE)@l
1128 stw r4, LBLAWBAR1(r3) /* LBLAWBAR1 <= CONFIG_SYS_FLASH_BASE */
1130 /* Store 0x80000012 + log2(CONFIG_SYS_FLASH_SIZE) into LBLAWAR1 */
1131 lis r4, (0x80000012)@h
1132 ori r4, r4, (0x80000012)@l
1133 li r5, CONFIG_SYS_FLASH_SIZE
1134 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
1138 stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */
1139 /* Wait for HW to catch up */
1140 lwz r4, LBLAWAR1(r3)
1145 /* Though all the LBIU Local Access Windows and LBC Banks will be
1146 * initialized in the C code, we'd better configure boot ROM's
1147 * window 0 and bank 0 correctly at here.
1149 remap_flash_by_law0:
1150 /* Initialize the BR0 with the boot ROM starting address. */
1154 lis r5, (CONFIG_SYS_FLASH_BASE & 0xFFFF8000)@h
1155 ori r5, r5, (CONFIG_SYS_FLASH_BASE & 0xFFFF8000)@l
1157 stw r5, BR0(r3) /* r5 <= (CONFIG_SYS_FLASH_BASE & 0xFFFF8000) | (BR0 & 0x00007FFF) */
1160 lis r5, ~((CONFIG_SYS_FLASH_SIZE << 4) - 1)
1164 lis r4, (CONFIG_SYS_FLASH_BASE)@h
1165 ori r4, r4, (CONFIG_SYS_FLASH_BASE)@l
1166 stw r4, LBLAWBAR0(r3) /* LBLAWBAR0 <= CONFIG_SYS_FLASH_BASE */
1168 /* Store 0x80000012 + log2(CONFIG_SYS_FLASH_SIZE) into LBLAWAR0 */
1169 lis r4, (0x80000012)@h
1170 ori r4, r4, (0x80000012)@l
1171 li r5, CONFIG_SYS_FLASH_SIZE
1172 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
1175 stw r4, LBLAWAR0(r3) /* LBLAWAR0 <= Flash Size */
1179 stw r4, LBLAWBAR1(r3)
1180 stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */
1181 /* Wait for HW to catch up */
1182 lwz r4, LBLAWAR1(r3)
1186 #endif /* CONFIG_SYS_FLASHBOOT */