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>
16 #include <system-constants.h>
18 #include <ppc_asm.tmpl>
21 #include <asm/cache.h>
23 #include <asm/u-boot.h>
25 #include "hrcw/hrcw.h"
26 #include "bats/bats.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) && CONFIG_IS_ENABLED(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 */
93 .globl enable_addr_trans
95 /* enable address translation */
97 ori r5, r5, (MSR_IR | MSR_DR)
102 .globl disable_addr_trans
104 /* disable address translation */
107 andi. r0, r3, (MSR_IR | MSR_DR)
114 #ifndef CONFIG_DEFAULT_IMMR
115 #error CONFIG_DEFAULT_IMMR must be defined
116 #endif /* CONFIG_DEFAULT_IMMR */
119 * After configuration, a system reset exception is executed using the
120 * vector at offset 0x100 relative to the base set by MSR[IP]. If
121 * MSR[IP] is 0, the base address is 0x00000000. If MSR[IP] is 1, the
122 * base address is 0xfff00000. In the case of a Power On Reset or Hard
123 * Reset, the value of MSR[IP] is determined by the CIP field in the
126 * Other bits in the HRCW set up the Base Address and Port Size in BR0.
127 * This determines the location of the boot ROM (flash or EPROM) in the
128 * processor's address space at boot time. As long as the HRCW is set up
129 * so that we eventually end up executing the code below when the
130 * processor executes the reset exception, the actual values used should
133 * Once we have got here, the address mask in OR0 is cleared so that the
134 * bottom 32K of the boot ROM is effectively repeated all throughout the
135 * processor's address space, after which we can jump to the absolute
136 * address at which the boot ROM was linked at compile time, and proceed
137 * to initialise the memory controller without worrying if the rug will
138 * be pulled out from under us, so to speak (it will be fine as long as
139 * we configure BR0 with the same boot ROM link address).
141 . = EXC_OFF_SYS_RESET
144 _start: /* time t 0 */
145 lis r4, CONFIG_DEFAULT_IMMR@h
148 mfmsr r5 /* save msr contents */
150 /* 83xx manuals prescribe a specific sequence for updating IMMRBAR. */
154 lis r3, CONFIG_SYS_IMMR@h
155 ori r3, r3, CONFIG_SYS_IMMR@l
161 lwz r6, 0(r7) /* Arbitrary external load */
167 /* Initialise the E300 processor core */
168 /*------------------------------------------*/
170 #if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_MPC83XX_WAIT_FOR_NAND)) || \
171 defined(CONFIG_NAND_SPL)
172 /* The FCM begins execution after only the first page
173 * is loaded. Wait for the rest before branching
174 * to another flash page.
176 1: lwz r6, 0x50b0(r3)
183 #ifdef CONFIG_SYS_FLASHBOOT
185 /* Inflate flash location so it appears everywhere, calculate */
186 /* the absolute address in final location of the FLASH, jump */
187 /* there and deflate the flash size back to minimal size */
188 /*------------------------------------------------------------*/
190 lis r4, (CONFIG_SYS_MONITOR_BASE)@h
191 ori r4, r4, (CONFIG_SYS_MONITOR_BASE)@l
192 addi r5, r4, in_flash - _start + EXC_OFF_SYS_RESET
196 #if 1 /* Remapping flash with LAW0. */
197 bl remap_flash_by_law0
199 #endif /* CONFIG_SYS_FLASHBOOT */
206 * Cache must be enabled here for stack-in-cache trick.
207 * This means we need to enable the BATS.
209 * 1) for the EVB, original gt regs need to be mapped
210 * 2) need to have an IBAT for the 0xf region,
211 * we are running there!
212 * Cache should be turned on after BATs, since by default
213 * everything is write-through.
214 * The init-mem BAT can be reused after reloc. The old
215 * gt-regs BAT can be reused after board_init_f calls
216 * board_early_init_f (EVB only).
218 /* enable address translation */
222 /* enable the data cache */
225 #ifdef CONFIG_SYS_INIT_RAM_LOCK
230 /* set up the stack pointer in our newly created
231 * cache-ram; use r3 to keep the new SP for now to
232 * avoid overiding the SP it uselessly */
233 lis r3, SYS_INIT_SP_ADDR@h
234 ori r3, r3, SYS_INIT_SP_ADDR@l
236 /* r4 = end of GD area */
237 addi r4, r3, GENERATED_GBL_DATA_SIZE
247 #if CONFIG_VAL(SYS_MALLOC_F_LEN)
249 #if CONFIG_VAL(SYS_MALLOC_F_LEN) + GENERATED_GBL_DATA_SIZE > CFG_SYS_INIT_RAM_SIZE
250 #error "SYS_MALLOC_F_LEN too large to fit into initial RAM."
253 /* r3 = new stack pointer / pre-reloc malloc area */
254 subi r3, r3, CONFIG_VAL(SYS_MALLOC_F_LEN)
256 /* Set pointer to pre-reloc malloc area in GD */
257 stw r3, GD_MALLOC_BASE(r4)
259 li r0, 0 /* Make room for stack frame header and */
260 stwu r0, -4(r3) /* clear final stack frame so that */
261 stwu r0, -4(r3) /* stack backtraces terminate cleanly */
263 /* Finally, actually set SP */
266 /* let the C-code set up the rest */
268 /* Be careful to keep code relocatable & stack humble */
269 /*------------------------------------------------------*/
271 GET_GOT /* initialize GOT access */
272 /* Needed for -msingle-pic-base */
273 bl _GLOBAL_OFFSET_TABLE_@local-4
277 lis r3, CONFIG_SYS_IMMR@h
278 /* run low-level CPU init code (in Flash)*/
281 /* run 1st part of board init code (in Flash)*/
282 li r3, 0 /* clear boot_flag for calling board_init_f */
285 /* NOTREACHED - board_init_f() does not return */
292 .globl _start_of_vectors
296 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
298 /* Data Storage exception. */
299 STD_EXCEPTION(0x300, DataStorage, UnknownException)
301 /* Instruction Storage exception. */
302 STD_EXCEPTION(0x400, InstStorage, UnknownException)
304 /* External Interrupt exception. */
306 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
309 /* Alignment exception. */
312 EXCEPTION_PROLOG(SRR0, SRR1)
317 addi r3,r1,STACK_FRAME_OVERHEAD
318 EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
320 /* Program check exception */
323 EXCEPTION_PROLOG(SRR0, SRR1)
324 addi r3,r1,STACK_FRAME_OVERHEAD
325 EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
328 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
330 /* I guess we could implement decrementer, and may have
331 * to someday for timekeeping.
333 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
335 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
336 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
337 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
338 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
340 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
341 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
343 STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
344 STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
345 STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
349 * This exception occurs when the program counter matches the
350 * Instruction Address Breakpoint Register (IABR).
352 * I want the cpu to halt if this occurs so I can hunt around
353 * with the debugger and look at things.
355 * When DEBUG is defined, both machine check enable (in the MSR)
356 * and checkstop reset enable (in the reset mode register) are
357 * turned off and so a checkstop condition will result in the cpu
360 * I force the cpu into a checkstop condition by putting an illegal
361 * instruction here (at least this is the theory).
363 * well - that didnt work, so just do an infinite loop!
367 STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
369 STD_EXCEPTION(0x1400, SMI, UnknownException)
371 STD_EXCEPTION(0x1500, Trap_15, UnknownException)
372 STD_EXCEPTION(0x1600, Trap_16, UnknownException)
373 STD_EXCEPTION(0x1700, Trap_17, UnknownException)
374 STD_EXCEPTION(0x1800, Trap_18, UnknownException)
375 STD_EXCEPTION(0x1900, Trap_19, UnknownException)
376 STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
377 STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
378 STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
379 STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
380 STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
381 STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
382 STD_EXCEPTION(0x2000, Trap_20, UnknownException)
383 STD_EXCEPTION(0x2100, Trap_21, UnknownException)
384 STD_EXCEPTION(0x2200, Trap_22, UnknownException)
385 STD_EXCEPTION(0x2300, Trap_23, UnknownException)
386 STD_EXCEPTION(0x2400, Trap_24, UnknownException)
387 STD_EXCEPTION(0x2500, Trap_25, UnknownException)
388 STD_EXCEPTION(0x2600, Trap_26, UnknownException)
389 STD_EXCEPTION(0x2700, Trap_27, UnknownException)
390 STD_EXCEPTION(0x2800, Trap_28, UnknownException)
391 STD_EXCEPTION(0x2900, Trap_29, UnknownException)
392 STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
393 STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
394 STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
395 STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
396 STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
397 STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
400 .globl _end_of_vectors
406 * This code finishes saving the registers to the exception frame
407 * and jumps to the appropriate handler for the exception.
408 * Register r21 is pointer into trap frame, r1 has new stack pointer.
410 .globl transfer_to_handler
421 andi. r24,r23,0x3f00 /* get vector offset */
425 lwz r24,0(r23) /* virtual address of handler */
426 lwz r23,4(r23) /* where to go when done */
431 rfi /* jump to handler, enable MMU */
434 mfmsr r28 /* Disable interrupts */
438 SYNC /* Some chip revs need this... */
453 lwz r2,_NIP(r1) /* Restore environment */
462 #endif /* !MINIMAL_SPL */
465 * This code initialises the E300 processor core
466 * (conforms to PowerPC 603e spec)
467 * Note: expects original MSR contents to be in r5.
469 .globl init_e300_core
470 init_e300_core: /* time t 10 */
471 /* Initialize machine status; enable machine check interrupt */
472 /*-----------------------------------------------------------*/
474 li r3, MSR_KERNEL /* Set ME and RI flags */
475 rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */
477 rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */
479 SYNC /* Some chip revs need this... */
482 mtspr SRR1, r3 /* Make SRR1 match MSR */
485 lis r3, CONFIG_SYS_IMMR@h
486 #if defined(CONFIG_WATCHDOG)
487 /* Initialise the Watchdog values and reset it (if req) */
488 /*------------------------------------------------------*/
489 lis r4, CFG_SYS_WATCHDOG_VALUE
490 ori r4, r4, (SWCRR_SWEN | SWCRR_SWRI | SWCRR_SWPR)
500 /* Disable Watchdog */
501 /*-------------------*/
503 /* Check to see if its enabled for disabling
504 once disabled by SW you can't re-enable */
510 #endif /* CONFIG_WATCHDOG */
512 #if defined(CONFIG_MASK_AER_AO)
513 /* Write the Arbiter Event Enable to mask Address Only traps. */
514 /* This prevents the dcbz instruction from being trapped when */
515 /* HID0_ABE Address Broadcast Enable is set and the MEMORY */
516 /* COHERENCY bit is set in the WIMG bits, which is often */
517 /* needed for PCI operation. */
519 rlwinm r0, r4, 0, ~AER_AO
521 #endif /* CONFIG_MASK_AER_AO */
523 /* Initialize the Hardware Implementation-dependent Registers */
524 /* HID0 also contains cache control */
525 /* - force invalidation of data and instruction caches */
526 /*------------------------------------------------------*/
528 lis r3, CONFIG_SYS_HID0_INIT@h
529 ori r3, r3, (CONFIG_SYS_HID0_INIT | HID0_ICFI | HID0_DCFI)@l
533 lis r3, CONFIG_SYS_HID0_FINAL@h
534 ori r3, r3, (CONFIG_SYS_HID0_FINAL & ~(HID0_ICFI | HID0_DCFI))@l
538 lis r3, CONFIG_SYS_HID2@h
539 ori r3, r3, CONFIG_SYS_HID2@l
544 /*------------------------------*/
547 /* setup_bats - set them up to some initial state */
553 addis r4, r0, CONFIG_SYS_IBAT0L@h
554 ori r4, r4, CONFIG_SYS_IBAT0L@l
555 addis r3, r0, CONFIG_SYS_IBAT0U@h
556 ori r3, r3, CONFIG_SYS_IBAT0U@l
561 addis r4, r0, CONFIG_SYS_DBAT0L@h
562 ori r4, r4, CONFIG_SYS_DBAT0L@l
563 addis r3, r0, CONFIG_SYS_DBAT0U@h
564 ori r3, r3, CONFIG_SYS_DBAT0U@l
569 addis r4, r0, CONFIG_SYS_IBAT1L@h
570 ori r4, r4, CONFIG_SYS_IBAT1L@l
571 addis r3, r0, CONFIG_SYS_IBAT1U@h
572 ori r3, r3, CONFIG_SYS_IBAT1U@l
577 addis r4, r0, CONFIG_SYS_DBAT1L@h
578 ori r4, r4, CONFIG_SYS_DBAT1L@l
579 addis r3, r0, CONFIG_SYS_DBAT1U@h
580 ori r3, r3, CONFIG_SYS_DBAT1U@l
585 addis r4, r0, CONFIG_SYS_IBAT2L@h
586 ori r4, r4, CONFIG_SYS_IBAT2L@l
587 addis r3, r0, CONFIG_SYS_IBAT2U@h
588 ori r3, r3, CONFIG_SYS_IBAT2U@l
593 addis r4, r0, CONFIG_SYS_DBAT2L@h
594 ori r4, r4, CONFIG_SYS_DBAT2L@l
595 addis r3, r0, CONFIG_SYS_DBAT2U@h
596 ori r3, r3, CONFIG_SYS_DBAT2U@l
601 addis r4, r0, CONFIG_SYS_IBAT3L@h
602 ori r4, r4, CONFIG_SYS_IBAT3L@l
603 addis r3, r0, CONFIG_SYS_IBAT3U@h
604 ori r3, r3, CONFIG_SYS_IBAT3U@l
609 addis r4, r0, CONFIG_SYS_DBAT3L@h
610 ori r4, r4, CONFIG_SYS_DBAT3L@l
611 addis r3, r0, CONFIG_SYS_DBAT3U@h
612 ori r3, r3, CONFIG_SYS_DBAT3U@l
616 #ifdef CONFIG_HIGH_BATS
618 addis r4, r0, CONFIG_SYS_IBAT4L@h
619 ori r4, r4, CONFIG_SYS_IBAT4L@l
620 addis r3, r0, CONFIG_SYS_IBAT4U@h
621 ori r3, r3, CONFIG_SYS_IBAT4U@l
626 addis r4, r0, CONFIG_SYS_DBAT4L@h
627 ori r4, r4, CONFIG_SYS_DBAT4L@l
628 addis r3, r0, CONFIG_SYS_DBAT4U@h
629 ori r3, r3, CONFIG_SYS_DBAT4U@l
634 addis r4, r0, CONFIG_SYS_IBAT5L@h
635 ori r4, r4, CONFIG_SYS_IBAT5L@l
636 addis r3, r0, CONFIG_SYS_IBAT5U@h
637 ori r3, r3, CONFIG_SYS_IBAT5U@l
642 addis r4, r0, CONFIG_SYS_DBAT5L@h
643 ori r4, r4, CONFIG_SYS_DBAT5L@l
644 addis r3, r0, CONFIG_SYS_DBAT5U@h
645 ori r3, r3, CONFIG_SYS_DBAT5U@l
650 addis r4, r0, CONFIG_SYS_IBAT6L@h
651 ori r4, r4, CONFIG_SYS_IBAT6L@l
652 addis r3, r0, CONFIG_SYS_IBAT6U@h
653 ori r3, r3, CONFIG_SYS_IBAT6U@l
658 addis r4, r0, CONFIG_SYS_DBAT6L@h
659 ori r4, r4, CONFIG_SYS_DBAT6L@l
660 addis r3, r0, CONFIG_SYS_DBAT6U@h
661 ori r3, r3, CONFIG_SYS_DBAT6U@l
666 addis r4, r0, CONFIG_SYS_IBAT7L@h
667 ori r4, r4, CONFIG_SYS_IBAT7L@l
668 addis r3, r0, CONFIG_SYS_IBAT7U@h
669 ori r3, r3, CONFIG_SYS_IBAT7U@l
674 addis r4, r0, CONFIG_SYS_DBAT7L@h
675 ori r4, r4, CONFIG_SYS_DBAT7L@l
676 addis r3, r0, CONFIG_SYS_DBAT7U@h
677 ori r3, r3, CONFIG_SYS_DBAT7U@l
684 /* invalidate all tlb's
686 * From the 603e User Manual: "The 603e provides the ability to
687 * invalidate a TLB entry. The TLB Invalidate Entry (tlbie)
688 * instruction invalidates the TLB entry indexed by the EA, and
689 * operates on both the instruction and data TLBs simultaneously
690 * invalidating four TLB entries (both sets in each TLB). The
691 * index corresponds to bits 15-19 of the EA. To invalidate all
692 * entries within both TLBs, 32 tlbie instructions should be
693 * issued, incrementing this field by one each time."
695 * "Note that the tlbia instruction is not implemented on the
698 * bits 15-19 correspond to addresses 0x00000000 to 0x0001F000
699 * incrementing by 0x1000 each time. The code below is sort of
700 * based on code in "flush_tlbs" from arch/powerpc/kernel/head.S
716 * Note: requires that all cache bits in
717 * HID0 are in the low half word.
724 li r4, HID0_ICFI|HID0_ILOCK
726 ori r4, r3, HID0_ICFI
728 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
730 mtspr HID0, r3 /* clears invalidate */
733 .globl icache_disable
737 ori r4, r4, HID0_ICE|HID0_ICFI|HID0_ILOCK
740 mtspr HID0, r3 /* clears invalidate, enable and lock */
746 rlwinm r3, r3, (31 - HID0_ICE_SHIFT + 1), 31, 31
748 #endif /* !MINIMAL_SPL */
753 li r5, HID0_DCFI|HID0_DLOCK
757 mtspr HID0, r3 /* enable, no invalidate */
760 .globl dcache_disable
763 bl flush_dcache /* uses r3 and r5 */
765 li r5, HID0_DCE|HID0_DLOCK
767 ori r5, r3, HID0_DCFI
769 mtspr HID0, r5 /* sets invalidate, clears enable and lock */
771 mtspr HID0, r3 /* clears invalidate */
778 rlwinm r3, r3, (31 - HID0_DCE_SHIFT + 1), 31, 31
784 lis r5, CONFIG_SYS_CACHELINE_SIZE
788 lis r5, CONFIG_SYS_CACHELINE_SIZE
793 /*-------------------------------------------------------------------*/
796 * void relocate_code(addr_sp, gd, addr_moni)
798 * This "function" does not return, instead it continues in RAM
799 * after relocating the monitor code.
803 * r5 = length in bytes
808 mr r1, r3 /* Set new stack pointer */
809 mr r9, r4 /* Save copy of Global Data pointer */
810 mr r10, r5 /* Save copy of Destination Address */
813 mr r3, r5 /* Destination Address */
814 lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
815 ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
816 lwz r5, GOT(__bss_start)
818 li r6, CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */
823 * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE)
824 * + Destination Address
830 /* First our own GOT */
832 /* then the one used by the C code */
842 beq cr1,4f /* In place copy is not necessary */
843 beq 7f /* Protect against 0 count */
872 2: slwi r0,r0,2 /* re copy in reverse order ... y do we needed it? */
880 * Now flush the cache: note that we must start from a cache aligned
881 * address. Otherwise we might miss one cache line.
885 beq 7f /* Always flush prefetch queue in any case */
893 sync /* Wait for all dcbst to complete on bus */
899 7: sync /* Wait for all icbi to complete on bus */
903 * We are done. Do not return, instead branch to second part of board
904 * initialization, now running from RAM.
906 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
913 * Relocation Function, r12 point to got2+0x8000
915 * Adjust got2 pointers, no need to check for 0, this code
916 * already puts a few entries in the table.
918 li r0,__got2_entries@sectoff@l
919 la r3,GOT(_GOT2_TABLE_)
920 lwz r11,GOT(_GOT2_TABLE_)
933 * Now adjust the fixups and the pointers to the fixups
934 * in case we need to move ourselves again.
936 li r0,__fixup_entries@sectoff@l
937 lwz r3,GOT(_FIXUP_TABLE_)
955 * Now clear BSS segment
957 lwz r3,GOT(__bss_start)
958 lwz r4,GOT(__bss_end)
971 mr r3, r9 /* Global Data pointer */
972 mr r4, r10 /* Destination Address */
977 * Copy exception vector code to low memory
980 * r7: source address, r8: end address, r9: target address
984 mflr r4 /* save link register */
987 lwz r8, GOT(_end_of_vectors)
989 li r9, 0x100 /* reset vector always at 0x100 */
992 bgelr /* return if r7>=r8 - just in case */
1002 * relocate `hdlr' and `int_return' entries
1004 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1005 li r8, Alignment - _start + EXC_OFF_SYS_RESET
1008 addi r7, r7, 0x100 /* next exception vector */
1012 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1015 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1018 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1019 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
1022 addi r7, r7, 0x100 /* next exception vector */
1026 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
1027 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1030 addi r7, r7, 0x100 /* next exception vector */
1034 mfmsr r3 /* now that the vectors have */
1035 lis r7, MSR_IP@h /* relocated into low memory */
1036 ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */
1037 andc r3, r3, r7 /* (if it was on) */
1038 SYNC /* Some chip revs need this... */
1042 mtlr r4 /* restore link register */
1045 #endif /* !MINIMAL_SPL */
1047 #ifdef CONFIG_SYS_INIT_RAM_LOCK
1049 /* Allocate Initial RAM in data cache.
1051 lis r3, (CFG_SYS_INIT_RAM_ADDR & ~31)@h
1052 ori r3, r3, (CFG_SYS_INIT_RAM_ADDR & ~31)@l
1053 li r4, ((CFG_SYS_INIT_RAM_SIZE & ~31) + \
1054 (CFG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
1061 /* Lock the data cache */
1063 ori r0, r0, HID0_DLOCK
1070 .globl unlock_ram_in_cache
1071 unlock_ram_in_cache:
1072 /* invalidate the INIT_RAM section */
1073 lis r3, (CFG_SYS_INIT_RAM_ADDR & ~31)@h
1074 ori r3, r3, (CFG_SYS_INIT_RAM_ADDR & ~31)@l
1075 li r4, ((CFG_SYS_INIT_RAM_SIZE & ~31) + \
1076 (CFG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
1082 sync /* Wait for all icbi to complete on bus */
1085 /* Unlock the data cache and invalidate it */
1087 li r5, HID0_DLOCK|HID0_DCFI
1088 andc r3, r3, r5 /* no invalidate, unlock */
1089 ori r5, r3, HID0_DCFI /* invalidate, unlock */
1091 mtspr HID0, r5 /* invalidate, unlock */
1093 mtspr HID0, r3 /* no invalidate, unlock */
1095 #endif /* !MINIMAL_SPL */
1096 #endif /* CONFIG_SYS_INIT_RAM_LOCK */
1098 #ifdef CONFIG_SYS_FLASHBOOT
1100 /* When booting from ROM (Flash or EPROM), clear the */
1101 /* Address Mask in OR0 so ROM appears everywhere */
1102 /*----------------------------------------------------*/
1103 lis r3, (CONFIG_SYS_IMMR)@h /* r3 <= CONFIG_SYS_IMMR */
1105 li r5, 0x7fff /* r5 <= 0x00007FFFF */
1107 stw r4, OR0@l(r3) /* OR0 <= OR0 & 0x00007FFFF */
1109 /* As MPC8349E User's Manual presented, when RCW[BMS] is set to 0,
1110 * system will boot from 0x0000_0100, and the LBLAWBAR0[BASE_ADDR]
1111 * reset value is 0x00000; when RCW[BMS] is set to 1, system will boot
1112 * from 0xFFF0_0100, and the LBLAWBAR0[BASE_ADDR] reset value is
1113 * 0xFF800. From the hard resetting to here, the processor fetched and
1114 * executed the instructions one by one. There is not absolutely
1115 * jumping happened. Laterly, the u-boot code has to do an absolutely
1116 * jumping to tell the CPU instruction fetching component what the
1117 * u-boot TEXT base address is. Because the TEXT base resides in the
1118 * boot ROM memory space, to garantee the code can run smoothly after
1119 * that jumping, we must map in the entire boot ROM by Local Access
1120 * Window. Sometimes, we desire an non-0x00000 or non-0xFF800 starting
1121 * address for boot ROM, such as 0xFE000000. In this case, the default
1122 * LBIU Local Access Widow 0 will not cover this memory space. So, we
1123 * need another window to map in it.
1125 lis r4, (CFG_SYS_FLASH_BASE)@h
1126 ori r4, r4, (CFG_SYS_FLASH_BASE)@l
1127 stw r4, LBLAWBAR1(r3) /* LBLAWBAR1 <= CFG_SYS_FLASH_BASE */
1129 /* Store 0x80000012 + log2(CFG_SYS_FLASH_SIZE) into LBLAWAR1 */
1130 lis r4, (0x80000012)@h
1131 ori r4, r4, (0x80000012)@l
1132 li r5, CFG_SYS_FLASH_SIZE
1133 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
1137 stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */
1138 /* Wait for HW to catch up */
1139 lwz r4, LBLAWAR1(r3)
1144 /* Though all the LBIU Local Access Windows and LBC Banks will be
1145 * initialized in the C code, we'd better configure boot ROM's
1146 * window 0 and bank 0 correctly at here.
1148 remap_flash_by_law0:
1149 /* Initialize the BR0 with the boot ROM starting address. */
1153 lis r5, (CFG_SYS_FLASH_BASE & 0xFFFF8000)@h
1154 ori r5, r5, (CFG_SYS_FLASH_BASE & 0xFFFF8000)@l
1156 stw r5, BR0(r3) /* r5 <= (CFG_SYS_FLASH_BASE & 0xFFFF8000) | (BR0 & 0x00007FFF) */
1159 lis r5, ~((CFG_SYS_FLASH_SIZE << 4) - 1)
1163 lis r4, (CFG_SYS_FLASH_BASE)@h
1164 ori r4, r4, (CFG_SYS_FLASH_BASE)@l
1165 stw r4, LBLAWBAR0(r3) /* LBLAWBAR0 <= CFG_SYS_FLASH_BASE */
1167 /* Store 0x80000012 + log2(CFG_SYS_FLASH_SIZE) into LBLAWAR0 */
1168 lis r4, (0x80000012)@h
1169 ori r4, r4, (0x80000012)@l
1170 li r5, CFG_SYS_FLASH_SIZE
1171 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
1174 stw r4, LBLAWAR0(r3) /* LBLAWAR0 <= Flash Size */
1178 stw r4, LBLAWBAR1(r3)
1179 stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */
1180 /* Wait for HW to catch up */
1181 lwz r4, LBLAWAR1(r3)
1185 #endif /* CONFIG_SYS_FLASHBOOT */