1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
4 * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
5 * Copyright (C) 2000, 2001,2002 Wolfgang Denk <wd@denx.de>
6 * Copyright Freescale Semiconductor, Inc. 2004, 2006, 2008.
10 * U-Boot - Startup Code for MPC83xx PowerPC based Embedded Boards
13 #include <asm-offsets.h>
18 #define CONFIG_83XX 1 /* needed for Linux kernel header files*/
20 #include <ppc_asm.tmpl>
23 #include <asm/cache.h>
25 #include <asm/u-boot.h>
27 #include "hrcw/hrcw.h"
29 /* We don't want the MMU yet.
34 * Floating Point enable, Machine Check and Recoverable Interr.
37 #define MSR_KERNEL (MSR_FP|MSR_RI)
39 #define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
42 #if defined(CONFIG_NAND_SPL) || \
43 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_INIT_MINIMAL))
47 #if !defined(CONFIG_SPL_BUILD) && !defined(CONFIG_NAND_SPL) && \
48 !defined(CONFIG_SYS_RAMBOOT)
49 #define CONFIG_SYS_FLASHBOOT
53 * Set up GOT: Global Offset Table
55 * Use r12 to access the GOT
58 GOT_ENTRY(_GOT2_TABLE_)
59 GOT_ENTRY(__bss_start)
63 GOT_ENTRY(_FIXUP_TABLE_)
65 GOT_ENTRY(_start_of_vectors)
66 GOT_ENTRY(_end_of_vectors)
67 GOT_ENTRY(transfer_to_handler)
72 * The Hard Reset Configuration Word (HRCW) table is in the first 64
73 * (0x40) bytes of flash. It has 8 bytes, but each byte is repeated 8
74 * times so the processor can fetch it out of flash whether the flash
75 * is 8, 16, 32, or 64 bits wide (hardware trickery).
78 #define _HRCW_TABLE_ENTRY(w) \
79 .fill 8,1,(((w)>>24)&0xff); \
80 .fill 8,1,(((w)>>16)&0xff); \
81 .fill 8,1,(((w)>> 8)&0xff); \
82 .fill 8,1,(((w) )&0xff)
84 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_LOW)
85 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_HIGH)
88 * Magic number and version string - put it after the HRCW since it
89 * cannot be first in flash like it is in many other processors.
91 .long 0x27051956 /* U-Boot Magic Number */
95 .ascii U_BOOT_VERSION_STRING, "\0"
99 .globl enable_addr_trans
101 /* enable address translation */
103 ori r5, r5, (MSR_IR | MSR_DR)
108 .globl disable_addr_trans
110 /* disable address translation */
113 andi. r0, r3, (MSR_IR | MSR_DR)
132 #ifndef CONFIG_DEFAULT_IMMR
133 #error CONFIG_DEFAULT_IMMR must be defined
134 #endif /* CONFIG_DEFAULT_IMMR */
135 #ifndef CONFIG_SYS_IMMR
136 #define CONFIG_SYS_IMMR CONFIG_DEFAULT_IMMR
137 #endif /* CONFIG_SYS_IMMR */
140 * After configuration, a system reset exception is executed using the
141 * vector at offset 0x100 relative to the base set by MSR[IP]. If
142 * MSR[IP] is 0, the base address is 0x00000000. If MSR[IP] is 1, the
143 * base address is 0xfff00000. In the case of a Power On Reset or Hard
144 * Reset, the value of MSR[IP] is determined by the CIP field in the
147 * Other bits in the HRCW set up the Base Address and Port Size in BR0.
148 * This determines the location of the boot ROM (flash or EPROM) in the
149 * processor's address space at boot time. As long as the HRCW is set up
150 * so that we eventually end up executing the code below when the
151 * processor executes the reset exception, the actual values used should
154 * Once we have got here, the address mask in OR0 is cleared so that the
155 * bottom 32K of the boot ROM is effectively repeated all throughout the
156 * processor's address space, after which we can jump to the absolute
157 * address at which the boot ROM was linked at compile time, and proceed
158 * to initialise the memory controller without worrying if the rug will
159 * be pulled out from under us, so to speak (it will be fine as long as
160 * we configure BR0 with the same boot ROM link address).
162 . = EXC_OFF_SYS_RESET
165 _start: /* time t 0 */
166 lis r4, CONFIG_DEFAULT_IMMR@h
169 mfmsr r5 /* save msr contents */
171 /* 83xx manuals prescribe a specific sequence for updating IMMRBAR. */
175 lis r3, CONFIG_SYS_IMMR@h
176 ori r3, r3, CONFIG_SYS_IMMR@l
182 lwz r6, 0(r7) /* Arbitrary external load */
188 /* Initialise the E300 processor core */
189 /*------------------------------------------*/
191 #if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_MPC83XX_WAIT_FOR_NAND)) || \
192 defined(CONFIG_NAND_SPL)
193 /* The FCM begins execution after only the first page
194 * is loaded. Wait for the rest before branching
195 * to another flash page.
197 1: lwz r6, 0x50b0(r3)
204 #ifdef CONFIG_SYS_FLASHBOOT
206 /* Inflate flash location so it appears everywhere, calculate */
207 /* the absolute address in final location of the FLASH, jump */
208 /* there and deflate the flash size back to minimal size */
209 /*------------------------------------------------------------*/
211 lis r4, (CONFIG_SYS_MONITOR_BASE)@h
212 ori r4, r4, (CONFIG_SYS_MONITOR_BASE)@l
213 addi r5, r4, in_flash - _start + EXC_OFF_SYS_RESET
217 #if 1 /* Remapping flash with LAW0. */
218 bl remap_flash_by_law0
220 #endif /* CONFIG_SYS_FLASHBOOT */
227 * Cache must be enabled here for stack-in-cache trick.
228 * This means we need to enable the BATS.
230 * 1) for the EVB, original gt regs need to be mapped
231 * 2) need to have an IBAT for the 0xf region,
232 * we are running there!
233 * Cache should be turned on after BATs, since by default
234 * everything is write-through.
235 * The init-mem BAT can be reused after reloc. The old
236 * gt-regs BAT can be reused after board_init_f calls
237 * board_early_init_f (EVB only).
239 /* enable address translation */
243 /* enable the data cache */
246 #ifdef CONFIG_SYS_INIT_RAM_LOCK
251 /* set up the stack pointer in our newly created
252 * cache-ram; use r3 to keep the new SP for now to
253 * avoid overiding the SP it uselessly */
254 lis r3, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@h
255 ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@l
257 /* r4 = end of GD area */
258 addi r4, r3, GENERATED_GBL_DATA_SIZE
268 #if CONFIG_VAL(SYS_MALLOC_F_LEN)
270 #if CONFIG_VAL(SYS_MALLOC_F_LEN) + GENERATED_GBL_DATA_SIZE > CONFIG_SYS_INIT_RAM_SIZE
271 #error "SYS_MALLOC_F_LEN too large to fit into initial RAM."
274 /* r3 = new stack pointer / pre-reloc malloc area */
275 subi r3, r3, CONFIG_VAL(SYS_MALLOC_F_LEN)
277 /* Set pointer to pre-reloc malloc area in GD */
278 stw r3, GD_MALLOC_BASE(r4)
280 li r0, 0 /* Make room for stack frame header and */
281 stwu r0, -4(r3) /* clear final stack frame so that */
282 stwu r0, -4(r3) /* stack backtraces terminate cleanly */
284 /* Finally, actually set SP */
287 /* let the C-code set up the rest */
289 /* Be careful to keep code relocatable & stack humble */
290 /*------------------------------------------------------*/
292 GET_GOT /* initialize GOT access */
293 /* Needed for -msingle-pic-base */
294 bl _GLOBAL_OFFSET_TABLE_@local-4
298 lis r3, CONFIG_SYS_IMMR@h
299 /* run low-level CPU init code (in Flash)*/
302 /* run 1st part of board init code (in Flash)*/
303 li r3, 0 /* clear boot_flag for calling board_init_f */
306 /* NOTREACHED - board_init_f() does not return */
313 .globl _start_of_vectors
317 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
319 /* Data Storage exception. */
320 STD_EXCEPTION(0x300, DataStorage, UnknownException)
322 /* Instruction Storage exception. */
323 STD_EXCEPTION(0x400, InstStorage, UnknownException)
325 /* External Interrupt exception. */
327 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
330 /* Alignment exception. */
333 EXCEPTION_PROLOG(SRR0, SRR1)
338 addi r3,r1,STACK_FRAME_OVERHEAD
339 EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
341 /* Program check exception */
344 EXCEPTION_PROLOG(SRR0, SRR1)
345 addi r3,r1,STACK_FRAME_OVERHEAD
346 EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
349 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
351 /* I guess we could implement decrementer, and may have
352 * to someday for timekeeping.
354 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
356 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
357 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
358 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
359 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
361 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
362 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
364 STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
365 STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
366 STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
370 * This exception occurs when the program counter matches the
371 * Instruction Address Breakpoint Register (IABR).
373 * I want the cpu to halt if this occurs so I can hunt around
374 * with the debugger and look at things.
376 * When DEBUG is defined, both machine check enable (in the MSR)
377 * and checkstop reset enable (in the reset mode register) are
378 * turned off and so a checkstop condition will result in the cpu
381 * I force the cpu into a checkstop condition by putting an illegal
382 * instruction here (at least this is the theory).
384 * well - that didnt work, so just do an infinite loop!
388 STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
390 STD_EXCEPTION(0x1400, SMI, UnknownException)
392 STD_EXCEPTION(0x1500, Trap_15, UnknownException)
393 STD_EXCEPTION(0x1600, Trap_16, UnknownException)
394 STD_EXCEPTION(0x1700, Trap_17, UnknownException)
395 STD_EXCEPTION(0x1800, Trap_18, UnknownException)
396 STD_EXCEPTION(0x1900, Trap_19, UnknownException)
397 STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
398 STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
399 STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
400 STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
401 STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
402 STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
403 STD_EXCEPTION(0x2000, Trap_20, UnknownException)
404 STD_EXCEPTION(0x2100, Trap_21, UnknownException)
405 STD_EXCEPTION(0x2200, Trap_22, UnknownException)
406 STD_EXCEPTION(0x2300, Trap_23, UnknownException)
407 STD_EXCEPTION(0x2400, Trap_24, UnknownException)
408 STD_EXCEPTION(0x2500, Trap_25, UnknownException)
409 STD_EXCEPTION(0x2600, Trap_26, UnknownException)
410 STD_EXCEPTION(0x2700, Trap_27, UnknownException)
411 STD_EXCEPTION(0x2800, Trap_28, UnknownException)
412 STD_EXCEPTION(0x2900, Trap_29, UnknownException)
413 STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
414 STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
415 STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
416 STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
417 STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
418 STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
421 .globl _end_of_vectors
427 * This code finishes saving the registers to the exception frame
428 * and jumps to the appropriate handler for the exception.
429 * Register r21 is pointer into trap frame, r1 has new stack pointer.
431 .globl transfer_to_handler
442 andi. r24,r23,0x3f00 /* get vector offset */
446 lwz r24,0(r23) /* virtual address of handler */
447 lwz r23,4(r23) /* where to go when done */
452 rfi /* jump to handler, enable MMU */
455 mfmsr r28 /* Disable interrupts */
459 SYNC /* Some chip revs need this... */
474 lwz r2,_NIP(r1) /* Restore environment */
483 #endif /* !MINIMAL_SPL */
486 * This code initialises the E300 processor core
487 * (conforms to PowerPC 603e spec)
488 * Note: expects original MSR contents to be in r5.
490 .globl init_e300_core
491 init_e300_core: /* time t 10 */
492 /* Initialize machine status; enable machine check interrupt */
493 /*-----------------------------------------------------------*/
495 li r3, MSR_KERNEL /* Set ME and RI flags */
496 rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */
498 rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */
500 SYNC /* Some chip revs need this... */
503 mtspr SRR1, r3 /* Make SRR1 match MSR */
506 lis r3, CONFIG_SYS_IMMR@h
507 #if defined(CONFIG_WATCHDOG)
508 /* Initialise the Watchdog values and reset it (if req) */
509 /*------------------------------------------------------*/
510 lis r4, CONFIG_SYS_WATCHDOG_VALUE
511 ori r4, r4, (SWCRR_SWEN | SWCRR_SWRI | SWCRR_SWPR)
521 /* Disable Watchdog */
522 /*-------------------*/
524 /* Check to see if its enabled for disabling
525 once disabled by SW you can't re-enable */
531 #endif /* CONFIG_WATCHDOG */
533 #if defined(CONFIG_MASK_AER_AO)
534 /* Write the Arbiter Event Enable to mask Address Only traps. */
535 /* This prevents the dcbz instruction from being trapped when */
536 /* HID0_ABE Address Broadcast Enable is set and the MEMORY */
537 /* COHERENCY bit is set in the WIMG bits, which is often */
538 /* needed for PCI operation. */
540 rlwinm r0, r4, 0, ~AER_AO
542 #endif /* CONFIG_MASK_AER_AO */
544 /* Initialize the Hardware Implementation-dependent Registers */
545 /* HID0 also contains cache control */
546 /* - force invalidation of data and instruction caches */
547 /*------------------------------------------------------*/
549 lis r3, CONFIG_SYS_HID0_INIT@h
550 ori r3, r3, (CONFIG_SYS_HID0_INIT | HID0_ICFI | HID0_DCFI)@l
554 lis r3, CONFIG_SYS_HID0_FINAL@h
555 ori r3, r3, (CONFIG_SYS_HID0_FINAL & ~(HID0_ICFI | HID0_DCFI))@l
559 lis r3, CONFIG_SYS_HID2@h
560 ori r3, r3, CONFIG_SYS_HID2@l
565 /*------------------------------*/
568 /* setup_bats - set them up to some initial state */
574 addis r4, r0, CONFIG_SYS_IBAT0L@h
575 ori r4, r4, CONFIG_SYS_IBAT0L@l
576 addis r3, r0, CONFIG_SYS_IBAT0U@h
577 ori r3, r3, CONFIG_SYS_IBAT0U@l
582 addis r4, r0, CONFIG_SYS_DBAT0L@h
583 ori r4, r4, CONFIG_SYS_DBAT0L@l
584 addis r3, r0, CONFIG_SYS_DBAT0U@h
585 ori r3, r3, CONFIG_SYS_DBAT0U@l
590 addis r4, r0, CONFIG_SYS_IBAT1L@h
591 ori r4, r4, CONFIG_SYS_IBAT1L@l
592 addis r3, r0, CONFIG_SYS_IBAT1U@h
593 ori r3, r3, CONFIG_SYS_IBAT1U@l
598 addis r4, r0, CONFIG_SYS_DBAT1L@h
599 ori r4, r4, CONFIG_SYS_DBAT1L@l
600 addis r3, r0, CONFIG_SYS_DBAT1U@h
601 ori r3, r3, CONFIG_SYS_DBAT1U@l
606 addis r4, r0, CONFIG_SYS_IBAT2L@h
607 ori r4, r4, CONFIG_SYS_IBAT2L@l
608 addis r3, r0, CONFIG_SYS_IBAT2U@h
609 ori r3, r3, CONFIG_SYS_IBAT2U@l
614 addis r4, r0, CONFIG_SYS_DBAT2L@h
615 ori r4, r4, CONFIG_SYS_DBAT2L@l
616 addis r3, r0, CONFIG_SYS_DBAT2U@h
617 ori r3, r3, CONFIG_SYS_DBAT2U@l
622 addis r4, r0, CONFIG_SYS_IBAT3L@h
623 ori r4, r4, CONFIG_SYS_IBAT3L@l
624 addis r3, r0, CONFIG_SYS_IBAT3U@h
625 ori r3, r3, CONFIG_SYS_IBAT3U@l
630 addis r4, r0, CONFIG_SYS_DBAT3L@h
631 ori r4, r4, CONFIG_SYS_DBAT3L@l
632 addis r3, r0, CONFIG_SYS_DBAT3U@h
633 ori r3, r3, CONFIG_SYS_DBAT3U@l
637 #ifdef CONFIG_HIGH_BATS
639 addis r4, r0, CONFIG_SYS_IBAT4L@h
640 ori r4, r4, CONFIG_SYS_IBAT4L@l
641 addis r3, r0, CONFIG_SYS_IBAT4U@h
642 ori r3, r3, CONFIG_SYS_IBAT4U@l
647 addis r4, r0, CONFIG_SYS_DBAT4L@h
648 ori r4, r4, CONFIG_SYS_DBAT4L@l
649 addis r3, r0, CONFIG_SYS_DBAT4U@h
650 ori r3, r3, CONFIG_SYS_DBAT4U@l
655 addis r4, r0, CONFIG_SYS_IBAT5L@h
656 ori r4, r4, CONFIG_SYS_IBAT5L@l
657 addis r3, r0, CONFIG_SYS_IBAT5U@h
658 ori r3, r3, CONFIG_SYS_IBAT5U@l
663 addis r4, r0, CONFIG_SYS_DBAT5L@h
664 ori r4, r4, CONFIG_SYS_DBAT5L@l
665 addis r3, r0, CONFIG_SYS_DBAT5U@h
666 ori r3, r3, CONFIG_SYS_DBAT5U@l
671 addis r4, r0, CONFIG_SYS_IBAT6L@h
672 ori r4, r4, CONFIG_SYS_IBAT6L@l
673 addis r3, r0, CONFIG_SYS_IBAT6U@h
674 ori r3, r3, CONFIG_SYS_IBAT6U@l
679 addis r4, r0, CONFIG_SYS_DBAT6L@h
680 ori r4, r4, CONFIG_SYS_DBAT6L@l
681 addis r3, r0, CONFIG_SYS_DBAT6U@h
682 ori r3, r3, CONFIG_SYS_DBAT6U@l
687 addis r4, r0, CONFIG_SYS_IBAT7L@h
688 ori r4, r4, CONFIG_SYS_IBAT7L@l
689 addis r3, r0, CONFIG_SYS_IBAT7U@h
690 ori r3, r3, CONFIG_SYS_IBAT7U@l
695 addis r4, r0, CONFIG_SYS_DBAT7L@h
696 ori r4, r4, CONFIG_SYS_DBAT7L@l
697 addis r3, r0, CONFIG_SYS_DBAT7U@h
698 ori r3, r3, CONFIG_SYS_DBAT7U@l
705 /* invalidate all tlb's
707 * From the 603e User Manual: "The 603e provides the ability to
708 * invalidate a TLB entry. The TLB Invalidate Entry (tlbie)
709 * instruction invalidates the TLB entry indexed by the EA, and
710 * operates on both the instruction and data TLBs simultaneously
711 * invalidating four TLB entries (both sets in each TLB). The
712 * index corresponds to bits 15-19 of the EA. To invalidate all
713 * entries within both TLBs, 32 tlbie instructions should be
714 * issued, incrementing this field by one each time."
716 * "Note that the tlbia instruction is not implemented on the
719 * bits 15-19 correspond to addresses 0x00000000 to 0x0001F000
720 * incrementing by 0x1000 each time. The code below is sort of
721 * based on code in "flush_tlbs" from arch/powerpc/kernel/head.S
737 * Note: requires that all cache bits in
738 * HID0 are in the low half word.
745 li r4, HID0_ICFI|HID0_ILOCK
747 ori r4, r3, HID0_ICFI
749 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
751 mtspr HID0, r3 /* clears invalidate */
754 .globl icache_disable
758 ori r4, r4, HID0_ICE|HID0_ICFI|HID0_ILOCK
761 mtspr HID0, r3 /* clears invalidate, enable and lock */
767 rlwinm r3, r3, (31 - HID0_ICE_SHIFT + 1), 31, 31
769 #endif /* !MINIMAL_SPL */
774 li r5, HID0_DCFI|HID0_DLOCK
778 mtspr HID0, r3 /* enable, no invalidate */
781 .globl dcache_disable
784 bl flush_dcache /* uses r3 and r5 */
786 li r5, HID0_DCE|HID0_DLOCK
788 ori r5, r3, HID0_DCFI
790 mtspr HID0, r5 /* sets invalidate, clears enable and lock */
792 mtspr HID0, r3 /* clears invalidate */
799 rlwinm r3, r3, (31 - HID0_DCE_SHIFT + 1), 31, 31
805 lis r5, CONFIG_SYS_CACHELINE_SIZE
809 lis r5, CONFIG_SYS_CACHELINE_SIZE
814 /*-------------------------------------------------------------------*/
817 * void relocate_code (addr_sp, gd, addr_moni)
819 * This "function" does not return, instead it continues in RAM
820 * after relocating the monitor code.
824 * r5 = length in bytes
829 mr r1, r3 /* Set new stack pointer */
830 mr r9, r4 /* Save copy of Global Data pointer */
831 mr r10, r5 /* Save copy of Destination Address */
834 mr r3, r5 /* Destination Address */
835 lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
836 ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
837 lwz r5, GOT(__bss_start)
839 li r6, CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */
844 * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE)
845 * + Destination Address
851 /* First our own GOT */
853 /* then the one used by the C code */
863 beq cr1,4f /* In place copy is not necessary */
864 beq 7f /* Protect against 0 count */
893 2: slwi r0,r0,2 /* re copy in reverse order ... y do we needed it? */
901 * Now flush the cache: note that we must start from a cache aligned
902 * address. Otherwise we might miss one cache line.
906 beq 7f /* Always flush prefetch queue in any case */
914 sync /* Wait for all dcbst to complete on bus */
920 7: sync /* Wait for all icbi to complete on bus */
924 * We are done. Do not return, instead branch to second part of board
925 * initialization, now running from RAM.
927 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
934 * Relocation Function, r12 point to got2+0x8000
936 * Adjust got2 pointers, no need to check for 0, this code
937 * already puts a few entries in the table.
939 li r0,__got2_entries@sectoff@l
940 la r3,GOT(_GOT2_TABLE_)
941 lwz r11,GOT(_GOT2_TABLE_)
954 * Now adjust the fixups and the pointers to the fixups
955 * in case we need to move ourselves again.
957 li r0,__fixup_entries@sectoff@l
958 lwz r3,GOT(_FIXUP_TABLE_)
976 * Now clear BSS segment
978 lwz r3,GOT(__bss_start)
979 lwz r4,GOT(__bss_end)
992 mr r3, r9 /* Global Data pointer */
993 mr r4, r10 /* Destination Address */
998 * Copy exception vector code to low memory
1001 * r7: source address, r8: end address, r9: target address
1005 mflr r4 /* save link register */
1008 lwz r8, GOT(_end_of_vectors)
1010 li r9, 0x100 /* reset vector always at 0x100 */
1013 bgelr /* return if r7>=r8 - just in case */
1023 * relocate `hdlr' and `int_return' entries
1025 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1026 li r8, Alignment - _start + EXC_OFF_SYS_RESET
1029 addi r7, r7, 0x100 /* next exception vector */
1033 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1036 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1039 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1040 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
1043 addi r7, r7, 0x100 /* next exception vector */
1047 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
1048 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1051 addi r7, r7, 0x100 /* next exception vector */
1055 mfmsr r3 /* now that the vectors have */
1056 lis r7, MSR_IP@h /* relocated into low memory */
1057 ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */
1058 andc r3, r3, r7 /* (if it was on) */
1059 SYNC /* Some chip revs need this... */
1063 mtlr r4 /* restore link register */
1066 #endif /* !MINIMAL_SPL */
1068 #ifdef CONFIG_SYS_INIT_RAM_LOCK
1070 /* Allocate Initial RAM in data cache.
1072 lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
1073 ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
1074 li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \
1075 (CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
1082 /* Lock the data cache */
1084 ori r0, r0, HID0_DLOCK
1091 .globl unlock_ram_in_cache
1092 unlock_ram_in_cache:
1093 /* invalidate the INIT_RAM section */
1094 lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
1095 ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
1096 li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \
1097 (CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
1103 sync /* Wait for all icbi to complete on bus */
1106 /* Unlock the data cache and invalidate it */
1108 li r5, HID0_DLOCK|HID0_DCFI
1109 andc r3, r3, r5 /* no invalidate, unlock */
1110 ori r5, r3, HID0_DCFI /* invalidate, unlock */
1112 mtspr HID0, r5 /* invalidate, unlock */
1114 mtspr HID0, r3 /* no invalidate, unlock */
1116 #endif /* !MINIMAL_SPL */
1117 #endif /* CONFIG_SYS_INIT_RAM_LOCK */
1119 #ifdef CONFIG_SYS_FLASHBOOT
1121 /* When booting from ROM (Flash or EPROM), clear the */
1122 /* Address Mask in OR0 so ROM appears everywhere */
1123 /*----------------------------------------------------*/
1124 lis r3, (CONFIG_SYS_IMMR)@h /* r3 <= CONFIG_SYS_IMMR */
1126 li r5, 0x7fff /* r5 <= 0x00007FFFF */
1128 stw r4, OR0@l(r3) /* OR0 <= OR0 & 0x00007FFFF */
1130 /* As MPC8349E User's Manual presented, when RCW[BMS] is set to 0,
1131 * system will boot from 0x0000_0100, and the LBLAWBAR0[BASE_ADDR]
1132 * reset value is 0x00000; when RCW[BMS] is set to 1, system will boot
1133 * from 0xFFF0_0100, and the LBLAWBAR0[BASE_ADDR] reset value is
1134 * 0xFF800. From the hard resetting to here, the processor fetched and
1135 * executed the instructions one by one. There is not absolutely
1136 * jumping happened. Laterly, the u-boot code has to do an absolutely
1137 * jumping to tell the CPU instruction fetching component what the
1138 * u-boot TEXT base address is. Because the TEXT base resides in the
1139 * boot ROM memory space, to garantee the code can run smoothly after
1140 * that jumping, we must map in the entire boot ROM by Local Access
1141 * Window. Sometimes, we desire an non-0x00000 or non-0xFF800 starting
1142 * address for boot ROM, such as 0xFE000000. In this case, the default
1143 * LBIU Local Access Widow 0 will not cover this memory space. So, we
1144 * need another window to map in it.
1146 lis r4, (CONFIG_SYS_FLASH_BASE)@h
1147 ori r4, r4, (CONFIG_SYS_FLASH_BASE)@l
1148 stw r4, LBLAWBAR1(r3) /* LBLAWBAR1 <= CONFIG_SYS_FLASH_BASE */
1150 /* Store 0x80000012 + log2(CONFIG_SYS_FLASH_SIZE) into LBLAWAR1 */
1151 lis r4, (0x80000012)@h
1152 ori r4, r4, (0x80000012)@l
1153 li r5, CONFIG_SYS_FLASH_SIZE
1154 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
1158 stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */
1159 /* Wait for HW to catch up */
1160 lwz r4, LBLAWAR1(r3)
1165 /* Though all the LBIU Local Access Windows and LBC Banks will be
1166 * initialized in the C code, we'd better configure boot ROM's
1167 * window 0 and bank 0 correctly at here.
1169 remap_flash_by_law0:
1170 /* Initialize the BR0 with the boot ROM starting address. */
1174 lis r5, (CONFIG_SYS_FLASH_BASE & 0xFFFF8000)@h
1175 ori r5, r5, (CONFIG_SYS_FLASH_BASE & 0xFFFF8000)@l
1177 stw r5, BR0(r3) /* r5 <= (CONFIG_SYS_FLASH_BASE & 0xFFFF8000) | (BR0 & 0x00007FFF) */
1180 lis r5, ~((CONFIG_SYS_FLASH_SIZE << 4) - 1)
1184 lis r4, (CONFIG_SYS_FLASH_BASE)@h
1185 ori r4, r4, (CONFIG_SYS_FLASH_BASE)@l
1186 stw r4, LBLAWBAR0(r3) /* LBLAWBAR0 <= CONFIG_SYS_FLASH_BASE */
1188 /* Store 0x80000012 + log2(CONFIG_SYS_FLASH_SIZE) into LBLAWAR0 */
1189 lis r4, (0x80000012)@h
1190 ori r4, r4, (0x80000012)@l
1191 li r5, CONFIG_SYS_FLASH_SIZE
1192 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
1195 stw r4, LBLAWAR0(r3) /* LBLAWAR0 <= Flash Size */
1199 stw r4, LBLAWBAR1(r3)
1200 stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */
1201 /* Wait for HW to catch up */
1202 lwz r4, LBLAWAR1(r3)
1206 #endif /* CONFIG_SYS_FLASHBOOT */