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>
5 * Copyright Freescale Semiconductor, Inc. 2004, 2006, 2008.
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 * U-Boot - Startup Code for MPC83xx PowerPC based Embedded Boards
30 #include <asm-offsets.h>
33 #ifndef CONFIG_IDENT_STRING
34 #define CONFIG_IDENT_STRING "MPC83XX"
38 #define CONFIG_83XX 1 /* needed for Linux kernel header files*/
39 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
41 #include <ppc_asm.tmpl>
44 #include <asm/cache.h>
46 #include <asm/u-boot.h>
48 /* We don't want the MMU yet.
53 * Floating Point enable, Machine Check and Recoverable Interr.
56 #define MSR_KERNEL (MSR_FP|MSR_RI)
58 #define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
61 #if defined(CONFIG_NAND_SPL) || \
62 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_INIT_MINIMAL))
66 #if !defined(CONFIG_SPL_BUILD) && !defined(CONFIG_NAND_SPL) && \
67 !defined(CONFIG_SYS_RAMBOOT)
68 #define CONFIG_SYS_FLASHBOOT
72 * Set up GOT: Global Offset Table
74 * Use r12 to access the GOT
77 GOT_ENTRY(_GOT2_TABLE_)
78 GOT_ENTRY(__bss_start)
79 GOT_ENTRY(__bss_end__)
82 GOT_ENTRY(_FIXUP_TABLE_)
84 GOT_ENTRY(_start_of_vectors)
85 GOT_ENTRY(_end_of_vectors)
86 GOT_ENTRY(transfer_to_handler)
91 * The Hard Reset Configuration Word (HRCW) table is in the first 64
92 * (0x40) bytes of flash. It has 8 bytes, but each byte is repeated 8
93 * times so the processor can fetch it out of flash whether the flash
94 * is 8, 16, 32, or 64 bits wide (hardware trickery).
97 #define _HRCW_TABLE_ENTRY(w) \
98 .fill 8,1,(((w)>>24)&0xff); \
99 .fill 8,1,(((w)>>16)&0xff); \
100 .fill 8,1,(((w)>> 8)&0xff); \
101 .fill 8,1,(((w) )&0xff)
103 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_LOW)
104 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_HIGH)
107 * Magic number and version string - put it after the HRCW since it
108 * cannot be first in flash like it is in many other processors.
110 .long 0x27051956 /* U-Boot Magic Number */
112 .globl version_string
114 .ascii U_BOOT_VERSION_STRING, "\0"
118 .globl enable_addr_trans
120 /* enable address translation */
122 ori r5, r5, (MSR_IR | MSR_DR)
127 .globl disable_addr_trans
129 /* disable address translation */
132 andi. r0, r3, (MSR_IR | MSR_DR)
156 #ifndef CONFIG_DEFAULT_IMMR
157 #error CONFIG_DEFAULT_IMMR must be defined
158 #endif /* CONFIG_SYS_DEFAULT_IMMR */
159 #ifndef CONFIG_SYS_IMMR
160 #define CONFIG_SYS_IMMR CONFIG_DEFAULT_IMMR
161 #endif /* CONFIG_SYS_IMMR */
164 * After configuration, a system reset exception is executed using the
165 * vector at offset 0x100 relative to the base set by MSR[IP]. If
166 * MSR[IP] is 0, the base address is 0x00000000. If MSR[IP] is 1, the
167 * base address is 0xfff00000. In the case of a Power On Reset or Hard
168 * Reset, the value of MSR[IP] is determined by the CIP field in the
171 * Other bits in the HRCW set up the Base Address and Port Size in BR0.
172 * This determines the location of the boot ROM (flash or EPROM) in the
173 * processor's address space at boot time. As long as the HRCW is set up
174 * so that we eventually end up executing the code below when the
175 * processor executes the reset exception, the actual values used should
178 * Once we have got here, the address mask in OR0 is cleared so that the
179 * bottom 32K of the boot ROM is effectively repeated all throughout the
180 * processor's address space, after which we can jump to the absolute
181 * address at which the boot ROM was linked at compile time, and proceed
182 * to initialise the memory controller without worrying if the rug will
183 * be pulled out from under us, so to speak (it will be fine as long as
184 * we configure BR0 with the same boot ROM link address).
186 . = EXC_OFF_SYS_RESET
189 _start: /* time t 0 */
190 lis r4, CONFIG_DEFAULT_IMMR@h
193 mfmsr r5 /* save msr contents */
195 /* 83xx manuals prescribe a specific sequence for updating IMMRBAR. */
199 lis r3, CONFIG_SYS_IMMR@h
200 ori r3, r3, CONFIG_SYS_IMMR@l
206 lwz r6, 0(r7) /* Arbitrary external load */
212 /* Initialise the E300 processor core */
213 /*------------------------------------------*/
215 #if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_MPC83XX_WAIT_FOR_NAND)) || \
216 defined(CONFIG_NAND_SPL)
217 /* The FCM begins execution after only the first page
218 * is loaded. Wait for the rest before branching
219 * to another flash page.
221 1: lwz r6, 0x50b0(r3)
228 #ifdef CONFIG_SYS_FLASHBOOT
230 /* Inflate flash location so it appears everywhere, calculate */
231 /* the absolute address in final location of the FLASH, jump */
232 /* there and deflate the flash size back to minimal size */
233 /*------------------------------------------------------------*/
235 lis r4, (CONFIG_SYS_MONITOR_BASE)@h
236 ori r4, r4, (CONFIG_SYS_MONITOR_BASE)@l
237 addi r5, r4, in_flash - _start + EXC_OFF_SYS_RESET
241 #if 1 /* Remapping flash with LAW0. */
242 bl remap_flash_by_law0
244 #endif /* CONFIG_SYS_FLASHBOOT */
251 * Cache must be enabled here for stack-in-cache trick.
252 * This means we need to enable the BATS.
254 * 1) for the EVB, original gt regs need to be mapped
255 * 2) need to have an IBAT for the 0xf region,
256 * we are running there!
257 * Cache should be turned on after BATs, since by default
258 * everything is write-through.
259 * The init-mem BAT can be reused after reloc. The old
260 * gt-regs BAT can be reused after board_init_f calls
261 * board_early_init_f (EVB only).
263 /* enable address translation */
267 /* enable the data cache */
270 #ifdef CONFIG_SYS_INIT_RAM_LOCK
275 /* set up the stack pointer in our newly created
277 lis r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@h
278 ori r1, r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@l
280 li r0, 0 /* Make room for stack frame header and */
281 stwu r0, -4(r1) /* clear final stack frame so that */
282 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
285 /* let the C-code set up the rest */
287 /* Be careful to keep code relocatable & stack humble */
288 /*------------------------------------------------------*/
290 GET_GOT /* initialize GOT access */
293 lis r3, CONFIG_SYS_IMMR@h
294 /* run low-level CPU init code (in Flash)*/
297 /* run 1st part of board init code (in Flash)*/
300 /* NOTREACHED - board_init_f() does not return */
307 .globl _start_of_vectors
311 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
313 /* Data Storage exception. */
314 STD_EXCEPTION(0x300, DataStorage, UnknownException)
316 /* Instruction Storage exception. */
317 STD_EXCEPTION(0x400, InstStorage, UnknownException)
319 /* External Interrupt exception. */
321 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
324 /* Alignment exception. */
327 EXCEPTION_PROLOG(SRR0, SRR1)
332 addi r3,r1,STACK_FRAME_OVERHEAD
333 EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
335 /* Program check exception */
338 EXCEPTION_PROLOG(SRR0, SRR1)
339 addi r3,r1,STACK_FRAME_OVERHEAD
340 EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
343 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
345 /* I guess we could implement decrementer, and may have
346 * to someday for timekeeping.
348 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
350 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
351 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
352 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
353 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
355 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
356 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
358 STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
359 STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
360 STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
364 * This exception occurs when the program counter matches the
365 * Instruction Address Breakpoint Register (IABR).
367 * I want the cpu to halt if this occurs so I can hunt around
368 * with the debugger and look at things.
370 * When DEBUG is defined, both machine check enable (in the MSR)
371 * and checkstop reset enable (in the reset mode register) are
372 * turned off and so a checkstop condition will result in the cpu
375 * I force the cpu into a checkstop condition by putting an illegal
376 * instruction here (at least this is the theory).
378 * well - that didnt work, so just do an infinite loop!
382 STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
384 STD_EXCEPTION(0x1400, SMI, UnknownException)
386 STD_EXCEPTION(0x1500, Trap_15, UnknownException)
387 STD_EXCEPTION(0x1600, Trap_16, UnknownException)
388 STD_EXCEPTION(0x1700, Trap_17, UnknownException)
389 STD_EXCEPTION(0x1800, Trap_18, UnknownException)
390 STD_EXCEPTION(0x1900, Trap_19, UnknownException)
391 STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
392 STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
393 STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
394 STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
395 STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
396 STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
397 STD_EXCEPTION(0x2000, Trap_20, UnknownException)
398 STD_EXCEPTION(0x2100, Trap_21, UnknownException)
399 STD_EXCEPTION(0x2200, Trap_22, UnknownException)
400 STD_EXCEPTION(0x2300, Trap_23, UnknownException)
401 STD_EXCEPTION(0x2400, Trap_24, UnknownException)
402 STD_EXCEPTION(0x2500, Trap_25, UnknownException)
403 STD_EXCEPTION(0x2600, Trap_26, UnknownException)
404 STD_EXCEPTION(0x2700, Trap_27, UnknownException)
405 STD_EXCEPTION(0x2800, Trap_28, UnknownException)
406 STD_EXCEPTION(0x2900, Trap_29, UnknownException)
407 STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
408 STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
409 STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
410 STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
411 STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
412 STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
415 .globl _end_of_vectors
421 * This code finishes saving the registers to the exception frame
422 * and jumps to the appropriate handler for the exception.
423 * Register r21 is pointer into trap frame, r1 has new stack pointer.
425 .globl transfer_to_handler
436 andi. r24,r23,0x3f00 /* get vector offset */
440 lwz r24,0(r23) /* virtual address of handler */
441 lwz r23,4(r23) /* where to go when done */
446 rfi /* jump to handler, enable MMU */
449 mfmsr r28 /* Disable interrupts */
453 SYNC /* Some chip revs need this... */
468 lwz r2,_NIP(r1) /* Restore environment */
477 #endif /* !MINIMAL_SPL */
480 * This code initialises the E300 processor core
481 * (conforms to PowerPC 603e spec)
482 * Note: expects original MSR contents to be in r5.
484 .globl init_e300_core
485 init_e300_core: /* time t 10 */
486 /* Initialize machine status; enable machine check interrupt */
487 /*-----------------------------------------------------------*/
489 li r3, MSR_KERNEL /* Set ME and RI flags */
490 rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */
492 rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */
494 SYNC /* Some chip revs need this... */
497 mtspr SRR1, r3 /* Make SRR1 match MSR */
500 lis r3, CONFIG_SYS_IMMR@h
501 #if defined(CONFIG_WATCHDOG)
502 /* Initialise the Watchdog values and reset it (if req) */
503 /*------------------------------------------------------*/
504 lis r4, CONFIG_SYS_WATCHDOG_VALUE
505 ori r4, r4, (SWCRR_SWEN | SWCRR_SWRI | SWCRR_SWPR)
515 /* Disable Watchdog */
516 /*-------------------*/
518 /* Check to see if its enabled for disabling
519 once disabled by SW you can't re-enable */
525 #endif /* CONFIG_WATCHDOG */
527 #if defined(CONFIG_MASK_AER_AO)
528 /* Write the Arbiter Event Enable to mask Address Only traps. */
529 /* This prevents the dcbz instruction from being trapped when */
530 /* HID0_ABE Address Broadcast Enable is set and the MEMORY */
531 /* COHERENCY bit is set in the WIMG bits, which is often */
532 /* needed for PCI operation. */
534 rlwinm r0, r4, 0, ~AER_AO
536 #endif /* CONFIG_MASK_AER_AO */
538 /* Initialize the Hardware Implementation-dependent Registers */
539 /* HID0 also contains cache control */
540 /* - force invalidation of data and instruction caches */
541 /*------------------------------------------------------*/
543 lis r3, CONFIG_SYS_HID0_INIT@h
544 ori r3, r3, (CONFIG_SYS_HID0_INIT | HID0_ICFI | HID0_DCFI)@l
548 lis r3, CONFIG_SYS_HID0_FINAL@h
549 ori r3, r3, (CONFIG_SYS_HID0_FINAL & ~(HID0_ICFI | HID0_DCFI))@l
553 lis r3, CONFIG_SYS_HID2@h
554 ori r3, r3, CONFIG_SYS_HID2@l
559 /*------------------------------*/
562 /* setup_bats - set them up to some initial state */
568 addis r4, r0, CONFIG_SYS_IBAT0L@h
569 ori r4, r4, CONFIG_SYS_IBAT0L@l
570 addis r3, r0, CONFIG_SYS_IBAT0U@h
571 ori r3, r3, CONFIG_SYS_IBAT0U@l
576 addis r4, r0, CONFIG_SYS_DBAT0L@h
577 ori r4, r4, CONFIG_SYS_DBAT0L@l
578 addis r3, r0, CONFIG_SYS_DBAT0U@h
579 ori r3, r3, CONFIG_SYS_DBAT0U@l
584 addis r4, r0, CONFIG_SYS_IBAT1L@h
585 ori r4, r4, CONFIG_SYS_IBAT1L@l
586 addis r3, r0, CONFIG_SYS_IBAT1U@h
587 ori r3, r3, CONFIG_SYS_IBAT1U@l
592 addis r4, r0, CONFIG_SYS_DBAT1L@h
593 ori r4, r4, CONFIG_SYS_DBAT1L@l
594 addis r3, r0, CONFIG_SYS_DBAT1U@h
595 ori r3, r3, CONFIG_SYS_DBAT1U@l
600 addis r4, r0, CONFIG_SYS_IBAT2L@h
601 ori r4, r4, CONFIG_SYS_IBAT2L@l
602 addis r3, r0, CONFIG_SYS_IBAT2U@h
603 ori r3, r3, CONFIG_SYS_IBAT2U@l
608 addis r4, r0, CONFIG_SYS_DBAT2L@h
609 ori r4, r4, CONFIG_SYS_DBAT2L@l
610 addis r3, r0, CONFIG_SYS_DBAT2U@h
611 ori r3, r3, CONFIG_SYS_DBAT2U@l
616 addis r4, r0, CONFIG_SYS_IBAT3L@h
617 ori r4, r4, CONFIG_SYS_IBAT3L@l
618 addis r3, r0, CONFIG_SYS_IBAT3U@h
619 ori r3, r3, CONFIG_SYS_IBAT3U@l
624 addis r4, r0, CONFIG_SYS_DBAT3L@h
625 ori r4, r4, CONFIG_SYS_DBAT3L@l
626 addis r3, r0, CONFIG_SYS_DBAT3U@h
627 ori r3, r3, CONFIG_SYS_DBAT3U@l
631 #ifdef CONFIG_HIGH_BATS
633 addis r4, r0, CONFIG_SYS_IBAT4L@h
634 ori r4, r4, CONFIG_SYS_IBAT4L@l
635 addis r3, r0, CONFIG_SYS_IBAT4U@h
636 ori r3, r3, CONFIG_SYS_IBAT4U@l
641 addis r4, r0, CONFIG_SYS_DBAT4L@h
642 ori r4, r4, CONFIG_SYS_DBAT4L@l
643 addis r3, r0, CONFIG_SYS_DBAT4U@h
644 ori r3, r3, CONFIG_SYS_DBAT4U@l
649 addis r4, r0, CONFIG_SYS_IBAT5L@h
650 ori r4, r4, CONFIG_SYS_IBAT5L@l
651 addis r3, r0, CONFIG_SYS_IBAT5U@h
652 ori r3, r3, CONFIG_SYS_IBAT5U@l
657 addis r4, r0, CONFIG_SYS_DBAT5L@h
658 ori r4, r4, CONFIG_SYS_DBAT5L@l
659 addis r3, r0, CONFIG_SYS_DBAT5U@h
660 ori r3, r3, CONFIG_SYS_DBAT5U@l
665 addis r4, r0, CONFIG_SYS_IBAT6L@h
666 ori r4, r4, CONFIG_SYS_IBAT6L@l
667 addis r3, r0, CONFIG_SYS_IBAT6U@h
668 ori r3, r3, CONFIG_SYS_IBAT6U@l
673 addis r4, r0, CONFIG_SYS_DBAT6L@h
674 ori r4, r4, CONFIG_SYS_DBAT6L@l
675 addis r3, r0, CONFIG_SYS_DBAT6U@h
676 ori r3, r3, CONFIG_SYS_DBAT6U@l
681 addis r4, r0, CONFIG_SYS_IBAT7L@h
682 ori r4, r4, CONFIG_SYS_IBAT7L@l
683 addis r3, r0, CONFIG_SYS_IBAT7U@h
684 ori r3, r3, CONFIG_SYS_IBAT7U@l
689 addis r4, r0, CONFIG_SYS_DBAT7L@h
690 ori r4, r4, CONFIG_SYS_DBAT7L@l
691 addis r3, r0, CONFIG_SYS_DBAT7U@h
692 ori r3, r3, CONFIG_SYS_DBAT7U@l
699 /* invalidate all tlb's
701 * From the 603e User Manual: "The 603e provides the ability to
702 * invalidate a TLB entry. The TLB Invalidate Entry (tlbie)
703 * instruction invalidates the TLB entry indexed by the EA, and
704 * operates on both the instruction and data TLBs simultaneously
705 * invalidating four TLB entries (both sets in each TLB). The
706 * index corresponds to bits 15-19 of the EA. To invalidate all
707 * entries within both TLBs, 32 tlbie instructions should be
708 * issued, incrementing this field by one each time."
710 * "Note that the tlbia instruction is not implemented on the
713 * bits 15-19 correspond to addresses 0x00000000 to 0x0001F000
714 * incrementing by 0x1000 each time. The code below is sort of
715 * based on code in "flush_tlbs" from arch/powerpc/kernel/head.S
731 * Note: requires that all cache bits in
732 * HID0 are in the low half word.
739 li r4, HID0_ICFI|HID0_ILOCK
741 ori r4, r3, HID0_ICFI
743 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
745 mtspr HID0, r3 /* clears invalidate */
748 .globl icache_disable
752 ori r4, r4, HID0_ICE|HID0_ICFI|HID0_ILOCK
755 mtspr HID0, r3 /* clears invalidate, enable and lock */
761 rlwinm r3, r3, (31 - HID0_ICE_SHIFT + 1), 31, 31
763 #endif /* !MINIMAL_SPL */
768 li r5, HID0_DCFI|HID0_DLOCK
772 mtspr HID0, r3 /* enable, no invalidate */
775 .globl dcache_disable
778 bl flush_dcache /* uses r3 and r5 */
780 li r5, HID0_DCE|HID0_DLOCK
782 ori r5, r3, HID0_DCFI
784 mtspr HID0, r5 /* sets invalidate, clears enable and lock */
786 mtspr HID0, r3 /* clears invalidate */
793 rlwinm r3, r3, (31 - HID0_DCE_SHIFT + 1), 31, 31
799 lis r5, CONFIG_SYS_CACHELINE_SIZE
803 lis r5, CONFIG_SYS_CACHELINE_SIZE
808 /*-------------------------------------------------------------------*/
811 * void relocate_code (addr_sp, gd, addr_moni)
813 * This "function" does not return, instead it continues in RAM
814 * after relocating the monitor code.
818 * r5 = length in bytes
823 mr r1, r3 /* Set new stack pointer */
824 mr r9, r4 /* Save copy of Global Data pointer */
825 mr r10, r5 /* Save copy of Destination Address */
828 mr r3, r5 /* Destination Address */
829 lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
830 ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
831 lwz r5, GOT(__bss_start)
833 li r6, CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */
838 * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE)
839 * + Destination Address
845 /* First our own GOT */
847 /* then the one used by the C code */
857 beq cr1,4f /* In place copy is not necessary */
858 beq 7f /* Protect against 0 count */
887 2: slwi r0,r0,2 /* re copy in reverse order ... y do we needed it? */
895 * Now flush the cache: note that we must start from a cache aligned
896 * address. Otherwise we might miss one cache line.
900 beq 7f /* Always flush prefetch queue in any case */
908 sync /* Wait for all dcbst to complete on bus */
914 7: sync /* Wait for all icbi to complete on bus */
918 * We are done. Do not return, instead branch to second part of board
919 * initialization, now running from RAM.
921 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
928 * Relocation Function, r12 point to got2+0x8000
930 * Adjust got2 pointers, no need to check for 0, this code
931 * already puts a few entries in the table.
933 li r0,__got2_entries@sectoff@l
934 la r3,GOT(_GOT2_TABLE_)
935 lwz r11,GOT(_GOT2_TABLE_)
948 * Now adjust the fixups and the pointers to the fixups
949 * in case we need to move ourselves again.
951 li r0,__fixup_entries@sectoff@l
952 lwz r3,GOT(_FIXUP_TABLE_)
970 * Now clear BSS segment
972 lwz r3,GOT(__bss_start)
973 #if defined(CONFIG_HYMOD)
975 * For HYMOD - the environment is the very last item in flash.
976 * The real .bss stops just before environment starts, so only
977 * clear up to that point.
979 * taken from mods for FADS board
981 lwz r4,GOT(environment)
983 lwz r4,GOT(__bss_end__)
997 mr r3, r9 /* Global Data pointer */
998 mr r4, r10 /* Destination Address */
1003 * Copy exception vector code to low memory
1006 * r7: source address, r8: end address, r9: target address
1010 mflr r4 /* save link register */
1013 lwz r8, GOT(_end_of_vectors)
1015 li r9, 0x100 /* reset vector always at 0x100 */
1018 bgelr /* return if r7>=r8 - just in case */
1028 * relocate `hdlr' and `int_return' entries
1030 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1031 li r8, Alignment - _start + EXC_OFF_SYS_RESET
1034 addi r7, r7, 0x100 /* next exception vector */
1038 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1041 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1044 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1045 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
1048 addi r7, r7, 0x100 /* next exception vector */
1052 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
1053 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1056 addi r7, r7, 0x100 /* next exception vector */
1060 mfmsr r3 /* now that the vectors have */
1061 lis r7, MSR_IP@h /* relocated into low memory */
1062 ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */
1063 andc r3, r3, r7 /* (if it was on) */
1064 SYNC /* Some chip revs need this... */
1068 mtlr r4 /* restore link register */
1071 #endif /* !MINIMAL_SPL */
1073 #ifdef CONFIG_SYS_INIT_RAM_LOCK
1075 /* Allocate Initial RAM in data cache.
1077 lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
1078 ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
1079 li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \
1080 (CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
1087 /* Lock the data cache */
1089 ori r0, r0, HID0_DLOCK
1096 .globl unlock_ram_in_cache
1097 unlock_ram_in_cache:
1098 /* invalidate the INIT_RAM section */
1099 lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
1100 ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
1101 li r4, ((CONFIG_SYS_INIT_RAM_SIZE & ~31) + \
1102 (CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
1108 sync /* Wait for all icbi to complete on bus */
1111 /* Unlock the data cache and invalidate it */
1113 li r5, HID0_DLOCK|HID0_DCFI
1114 andc r3, r3, r5 /* no invalidate, unlock */
1115 ori r5, r3, HID0_DCFI /* invalidate, unlock */
1117 mtspr HID0, r5 /* invalidate, unlock */
1119 mtspr HID0, r3 /* no invalidate, unlock */
1121 #endif /* !MINIMAL_SPL */
1122 #endif /* CONFIG_SYS_INIT_RAM_LOCK */
1124 #ifdef CONFIG_SYS_FLASHBOOT
1126 /* When booting from ROM (Flash or EPROM), clear the */
1127 /* Address Mask in OR0 so ROM appears everywhere */
1128 /*----------------------------------------------------*/
1129 lis r3, (CONFIG_SYS_IMMR)@h /* r3 <= CONFIG_SYS_IMMR */
1131 li r5, 0x7fff /* r5 <= 0x00007FFFF */
1133 stw r4, OR0@l(r3) /* OR0 <= OR0 & 0x00007FFFF */
1135 /* As MPC8349E User's Manual presented, when RCW[BMS] is set to 0,
1136 * system will boot from 0x0000_0100, and the LBLAWBAR0[BASE_ADDR]
1137 * reset value is 0x00000; when RCW[BMS] is set to 1, system will boot
1138 * from 0xFFF0_0100, and the LBLAWBAR0[BASE_ADDR] reset value is
1139 * 0xFF800. From the hard resetting to here, the processor fetched and
1140 * executed the instructions one by one. There is not absolutely
1141 * jumping happened. Laterly, the u-boot code has to do an absolutely
1142 * jumping to tell the CPU instruction fetching component what the
1143 * u-boot TEXT base address is. Because the TEXT base resides in the
1144 * boot ROM memory space, to garantee the code can run smoothly after
1145 * that jumping, we must map in the entire boot ROM by Local Access
1146 * Window. Sometimes, we desire an non-0x00000 or non-0xFF800 starting
1147 * address for boot ROM, such as 0xFE000000. In this case, the default
1148 * LBIU Local Access Widow 0 will not cover this memory space. So, we
1149 * need another window to map in it.
1151 lis r4, (CONFIG_SYS_FLASH_BASE)@h
1152 ori r4, r4, (CONFIG_SYS_FLASH_BASE)@l
1153 stw r4, LBLAWBAR1(r3) /* LBLAWBAR1 <= CONFIG_SYS_FLASH_BASE */
1155 /* Store 0x80000012 + log2(CONFIG_SYS_FLASH_SIZE) into LBLAWAR1 */
1156 lis r4, (0x80000012)@h
1157 ori r4, r4, (0x80000012)@l
1158 li r5, CONFIG_SYS_FLASH_SIZE
1159 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
1163 stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */
1164 /* Wait for HW to catch up */
1165 lwz r4, LBLAWAR1(r3)
1170 /* Though all the LBIU Local Access Windows and LBC Banks will be
1171 * initialized in the C code, we'd better configure boot ROM's
1172 * window 0 and bank 0 correctly at here.
1174 remap_flash_by_law0:
1175 /* Initialize the BR0 with the boot ROM starting address. */
1179 lis r5, (CONFIG_SYS_FLASH_BASE & 0xFFFF8000)@h
1180 ori r5, r5, (CONFIG_SYS_FLASH_BASE & 0xFFFF8000)@l
1182 stw r5, BR0(r3) /* r5 <= (CONFIG_SYS_FLASH_BASE & 0xFFFF8000) | (BR0 & 0x00007FFF) */
1185 lis r5, ~((CONFIG_SYS_FLASH_SIZE << 4) - 1)
1189 lis r4, (CONFIG_SYS_FLASH_BASE)@h
1190 ori r4, r4, (CONFIG_SYS_FLASH_BASE)@l
1191 stw r4, LBLAWBAR0(r3) /* LBLAWBAR0 <= CONFIG_SYS_FLASH_BASE */
1193 /* Store 0x80000012 + log2(CONFIG_SYS_FLASH_SIZE) into LBLAWAR0 */
1194 lis r4, (0x80000012)@h
1195 ori r4, r4, (0x80000012)@l
1196 li r5, CONFIG_SYS_FLASH_SIZE
1197 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
1200 stw r4, LBLAWAR0(r3) /* LBLAWAR0 <= Flash Size */
1204 stw r4, LBLAWBAR1(r3)
1205 stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */
1206 /* Wait for HW to catch up */
1207 lwz r4, LBLAWAR1(r3)
1211 #endif /* CONFIG_SYS_FLASHBOOT */