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
32 #include <timestamp.h>
35 #define CONFIG_83XX 1 /* needed for Linux kernel header files*/
36 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
38 #include <ppc_asm.tmpl>
41 #include <asm/cache.h>
43 #include <asm/u-boot.h>
45 #ifndef CONFIG_IDENT_STRING
46 #define CONFIG_IDENT_STRING "MPC83XX"
49 /* We don't want the MMU yet.
54 * Floating Point enable, Machine Check and Recoverable Interr.
57 #define MSR_KERNEL (MSR_FP|MSR_RI)
59 #define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
62 #if !defined(CONFIG_NAND_SPL) && !defined(CONFIG_SYS_RAMBOOT)
63 #define CONFIG_SYS_FLASHBOOT
67 * Set up GOT: Global Offset Table
69 * Use r12 to access the GOT
72 GOT_ENTRY(_GOT2_TABLE_)
73 GOT_ENTRY(__bss_start)
76 #ifndef CONFIG_NAND_SPL
77 GOT_ENTRY(_FIXUP_TABLE_)
79 GOT_ENTRY(_start_of_vectors)
80 GOT_ENTRY(_end_of_vectors)
81 GOT_ENTRY(transfer_to_handler)
86 * The Hard Reset Configuration Word (HRCW) table is in the first 64
87 * (0x40) bytes of flash. It has 8 bytes, but each byte is repeated 8
88 * times so the processor can fetch it out of flash whether the flash
89 * is 8, 16, 32, or 64 bits wide (hardware trickery).
92 #define _HRCW_TABLE_ENTRY(w) \
93 .fill 8,1,(((w)>>24)&0xff); \
94 .fill 8,1,(((w)>>16)&0xff); \
95 .fill 8,1,(((w)>> 8)&0xff); \
96 .fill 8,1,(((w) )&0xff)
98 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_LOW)
99 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_HIGH)
102 * Magic number and version string - put it after the HRCW since it
103 * cannot be first in flash like it is in many other processors.
105 .long 0x27051956 /* U-Boot Magic Number */
107 .globl version_string
109 .ascii U_BOOT_VERSION
110 .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
111 .ascii " ", CONFIG_IDENT_STRING, "\0"
115 .globl enable_addr_trans
117 /* enable address translation */
119 ori r5, r5, (MSR_IR | MSR_DR)
124 .globl disable_addr_trans
126 /* disable address translation */
129 andi. r0, r3, (MSR_IR | MSR_DR)
153 #ifndef CONFIG_DEFAULT_IMMR
154 #error CONFIG_DEFAULT_IMMR must be defined
155 #endif /* CONFIG_SYS_DEFAULT_IMMR */
156 #ifndef CONFIG_SYS_IMMR
157 #define CONFIG_SYS_IMMR CONFIG_DEFAULT_IMMR
158 #endif /* CONFIG_SYS_IMMR */
161 * After configuration, a system reset exception is executed using the
162 * vector at offset 0x100 relative to the base set by MSR[IP]. If
163 * MSR[IP] is 0, the base address is 0x00000000. If MSR[IP] is 1, the
164 * base address is 0xfff00000. In the case of a Power On Reset or Hard
165 * Reset, the value of MSR[IP] is determined by the CIP field in the
168 * Other bits in the HRCW set up the Base Address and Port Size in BR0.
169 * This determines the location of the boot ROM (flash or EPROM) in the
170 * processor's address space at boot time. As long as the HRCW is set up
171 * so that we eventually end up executing the code below when the
172 * processor executes the reset exception, the actual values used should
175 * Once we have got here, the address mask in OR0 is cleared so that the
176 * bottom 32K of the boot ROM is effectively repeated all throughout the
177 * processor's address space, after which we can jump to the absolute
178 * address at which the boot ROM was linked at compile time, and proceed
179 * to initialise the memory controller without worrying if the rug will
180 * be pulled out from under us, so to speak (it will be fine as long as
181 * we configure BR0 with the same boot ROM link address).
183 . = EXC_OFF_SYS_RESET
186 _start: /* time t 0 */
187 lis r4, CONFIG_DEFAULT_IMMR@h
190 mfmsr r5 /* save msr contents */
192 /* 83xx manuals prescribe a specific sequence for updating IMMRBAR. */
196 lis r3, CONFIG_SYS_IMMR@h
197 ori r3, r3, CONFIG_SYS_IMMR@l
203 lwz r6, 0(r7) /* Arbitrary external load */
209 /* Initialise the E300 processor core */
210 /*------------------------------------------*/
212 #ifdef CONFIG_NAND_SPL
213 /* The FCM begins execution after only the first page
214 * is loaded. Wait for the rest before branching
215 * to another flash page.
217 1: lwz r6, 0x50b0(r3)
224 #ifdef CONFIG_SYS_FLASHBOOT
226 /* Inflate flash location so it appears everywhere, calculate */
227 /* the absolute address in final location of the FLASH, jump */
228 /* there and deflate the flash size back to minimal size */
229 /*------------------------------------------------------------*/
231 lis r4, (CONFIG_SYS_MONITOR_BASE)@h
232 ori r4, r4, (CONFIG_SYS_MONITOR_BASE)@l
233 addi r5, r4, in_flash - _start + EXC_OFF_SYS_RESET
237 #if 1 /* Remapping flash with LAW0. */
238 bl remap_flash_by_law0
240 #endif /* CONFIG_SYS_FLASHBOOT */
247 * Cache must be enabled here for stack-in-cache trick.
248 * This means we need to enable the BATS.
250 * 1) for the EVB, original gt regs need to be mapped
251 * 2) need to have an IBAT for the 0xf region,
252 * we are running there!
253 * Cache should be turned on after BATs, since by default
254 * everything is write-through.
255 * The init-mem BAT can be reused after reloc. The old
256 * gt-regs BAT can be reused after board_init_f calls
257 * board_early_init_f (EVB only).
259 /* enable address translation */
263 /* enable the data cache */
266 #ifdef CONFIG_SYS_INIT_RAM_LOCK
271 /* set up the stack pointer in our newly created
273 lis r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@h
274 ori r1, r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@l
276 li r0, 0 /* Make room for stack frame header and */
277 stwu r0, -4(r1) /* clear final stack frame so that */
278 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
281 /* let the C-code set up the rest */
283 /* Be careful to keep code relocatable & stack humble */
284 /*------------------------------------------------------*/
286 GET_GOT /* initialize GOT access */
289 lis r3, CONFIG_SYS_IMMR@h
290 /* run low-level CPU init code (in Flash)*/
293 /* run 1st part of board init code (in Flash)*/
296 /* NOTREACHED - board_init_f() does not return */
298 #ifndef CONFIG_NAND_SPL
303 .globl _start_of_vectors
307 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
309 /* Data Storage exception. */
310 STD_EXCEPTION(0x300, DataStorage, UnknownException)
312 /* Instruction Storage exception. */
313 STD_EXCEPTION(0x400, InstStorage, UnknownException)
315 /* External Interrupt exception. */
317 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
320 /* Alignment exception. */
323 EXCEPTION_PROLOG(SRR0, SRR1)
328 addi r3,r1,STACK_FRAME_OVERHEAD
329 EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
331 /* Program check exception */
334 EXCEPTION_PROLOG(SRR0, SRR1)
335 addi r3,r1,STACK_FRAME_OVERHEAD
336 EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
339 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
341 /* I guess we could implement decrementer, and may have
342 * to someday for timekeeping.
344 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
346 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
347 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
348 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
349 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
351 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
352 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
354 STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
355 STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
356 STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
360 * This exception occurs when the program counter matches the
361 * Instruction Address Breakpoint Register (IABR).
363 * I want the cpu to halt if this occurs so I can hunt around
364 * with the debugger and look at things.
366 * When DEBUG is defined, both machine check enable (in the MSR)
367 * and checkstop reset enable (in the reset mode register) are
368 * turned off and so a checkstop condition will result in the cpu
371 * I force the cpu into a checkstop condition by putting an illegal
372 * instruction here (at least this is the theory).
374 * well - that didnt work, so just do an infinite loop!
378 STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
380 STD_EXCEPTION(0x1400, SMI, UnknownException)
382 STD_EXCEPTION(0x1500, Trap_15, UnknownException)
383 STD_EXCEPTION(0x1600, Trap_16, UnknownException)
384 STD_EXCEPTION(0x1700, Trap_17, UnknownException)
385 STD_EXCEPTION(0x1800, Trap_18, UnknownException)
386 STD_EXCEPTION(0x1900, Trap_19, UnknownException)
387 STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
388 STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
389 STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
390 STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
391 STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
392 STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
393 STD_EXCEPTION(0x2000, Trap_20, UnknownException)
394 STD_EXCEPTION(0x2100, Trap_21, UnknownException)
395 STD_EXCEPTION(0x2200, Trap_22, UnknownException)
396 STD_EXCEPTION(0x2300, Trap_23, UnknownException)
397 STD_EXCEPTION(0x2400, Trap_24, UnknownException)
398 STD_EXCEPTION(0x2500, Trap_25, UnknownException)
399 STD_EXCEPTION(0x2600, Trap_26, UnknownException)
400 STD_EXCEPTION(0x2700, Trap_27, UnknownException)
401 STD_EXCEPTION(0x2800, Trap_28, UnknownException)
402 STD_EXCEPTION(0x2900, Trap_29, UnknownException)
403 STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
404 STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
405 STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
406 STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
407 STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
408 STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
411 .globl _end_of_vectors
417 * This code finishes saving the registers to the exception frame
418 * and jumps to the appropriate handler for the exception.
419 * Register r21 is pointer into trap frame, r1 has new stack pointer.
421 .globl transfer_to_handler
432 andi. r24,r23,0x3f00 /* get vector offset */
436 lwz r24,0(r23) /* virtual address of handler */
437 lwz r23,4(r23) /* where to go when done */
442 rfi /* jump to handler, enable MMU */
445 mfmsr r28 /* Disable interrupts */
449 SYNC /* Some chip revs need this... */
464 lwz r2,_NIP(r1) /* Restore environment */
473 #endif /* !CONFIG_NAND_SPL */
476 * This code initialises the E300 processor core
477 * (conforms to PowerPC 603e spec)
478 * Note: expects original MSR contents to be in r5.
480 .globl init_e300_core
481 init_e300_core: /* time t 10 */
482 /* Initialize machine status; enable machine check interrupt */
483 /*-----------------------------------------------------------*/
485 li r3, MSR_KERNEL /* Set ME and RI flags */
486 rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */
488 rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */
490 SYNC /* Some chip revs need this... */
493 mtspr SRR1, r3 /* Make SRR1 match MSR */
496 lis r3, CONFIG_SYS_IMMR@h
497 #if defined(CONFIG_WATCHDOG)
498 /* Initialise the Watchdog values and reset it (if req) */
499 /*------------------------------------------------------*/
500 lis r4, CONFIG_SYS_WATCHDOG_VALUE
501 ori r4, r4, (SWCRR_SWEN | SWCRR_SWRI | SWCRR_SWPR)
511 /* Disable Watchdog */
512 /*-------------------*/
514 /* Check to see if its enabled for disabling
515 once disabled by SW you can't re-enable */
521 #endif /* CONFIG_WATCHDOG */
523 #if defined(CONFIG_MASK_AER_AO)
524 /* Write the Arbiter Event Enable to mask Address Only traps. */
525 /* This prevents the dcbz instruction from being trapped when */
526 /* HID0_ABE Address Broadcast Enable is set and the MEMORY */
527 /* COHERENCY bit is set in the WIMG bits, which is often */
528 /* needed for PCI operation. */
530 rlwinm r0, r4, 0, ~AER_AO
532 #endif /* CONFIG_MASK_AER_AO */
534 /* Initialize the Hardware Implementation-dependent Registers */
535 /* HID0 also contains cache control */
536 /* - force invalidation of data and instruction caches */
537 /*------------------------------------------------------*/
539 lis r3, CONFIG_SYS_HID0_INIT@h
540 ori r3, r3, (CONFIG_SYS_HID0_INIT | HID0_ICFI | HID0_DCFI)@l
544 lis r3, CONFIG_SYS_HID0_FINAL@h
545 ori r3, r3, (CONFIG_SYS_HID0_FINAL & ~(HID0_ICFI | HID0_DCFI))@l
549 lis r3, CONFIG_SYS_HID2@h
550 ori r3, r3, CONFIG_SYS_HID2@l
555 /*------------------------------*/
558 /* setup_bats - set them up to some initial state */
564 addis r4, r0, CONFIG_SYS_IBAT0L@h
565 ori r4, r4, CONFIG_SYS_IBAT0L@l
566 addis r3, r0, CONFIG_SYS_IBAT0U@h
567 ori r3, r3, CONFIG_SYS_IBAT0U@l
572 addis r4, r0, CONFIG_SYS_DBAT0L@h
573 ori r4, r4, CONFIG_SYS_DBAT0L@l
574 addis r3, r0, CONFIG_SYS_DBAT0U@h
575 ori r3, r3, CONFIG_SYS_DBAT0U@l
580 addis r4, r0, CONFIG_SYS_IBAT1L@h
581 ori r4, r4, CONFIG_SYS_IBAT1L@l
582 addis r3, r0, CONFIG_SYS_IBAT1U@h
583 ori r3, r3, CONFIG_SYS_IBAT1U@l
588 addis r4, r0, CONFIG_SYS_DBAT1L@h
589 ori r4, r4, CONFIG_SYS_DBAT1L@l
590 addis r3, r0, CONFIG_SYS_DBAT1U@h
591 ori r3, r3, CONFIG_SYS_DBAT1U@l
596 addis r4, r0, CONFIG_SYS_IBAT2L@h
597 ori r4, r4, CONFIG_SYS_IBAT2L@l
598 addis r3, r0, CONFIG_SYS_IBAT2U@h
599 ori r3, r3, CONFIG_SYS_IBAT2U@l
604 addis r4, r0, CONFIG_SYS_DBAT2L@h
605 ori r4, r4, CONFIG_SYS_DBAT2L@l
606 addis r3, r0, CONFIG_SYS_DBAT2U@h
607 ori r3, r3, CONFIG_SYS_DBAT2U@l
612 addis r4, r0, CONFIG_SYS_IBAT3L@h
613 ori r4, r4, CONFIG_SYS_IBAT3L@l
614 addis r3, r0, CONFIG_SYS_IBAT3U@h
615 ori r3, r3, CONFIG_SYS_IBAT3U@l
620 addis r4, r0, CONFIG_SYS_DBAT3L@h
621 ori r4, r4, CONFIG_SYS_DBAT3L@l
622 addis r3, r0, CONFIG_SYS_DBAT3U@h
623 ori r3, r3, CONFIG_SYS_DBAT3U@l
627 #ifdef CONFIG_HIGH_BATS
629 addis r4, r0, CONFIG_SYS_IBAT4L@h
630 ori r4, r4, CONFIG_SYS_IBAT4L@l
631 addis r3, r0, CONFIG_SYS_IBAT4U@h
632 ori r3, r3, CONFIG_SYS_IBAT4U@l
637 addis r4, r0, CONFIG_SYS_DBAT4L@h
638 ori r4, r4, CONFIG_SYS_DBAT4L@l
639 addis r3, r0, CONFIG_SYS_DBAT4U@h
640 ori r3, r3, CONFIG_SYS_DBAT4U@l
645 addis r4, r0, CONFIG_SYS_IBAT5L@h
646 ori r4, r4, CONFIG_SYS_IBAT5L@l
647 addis r3, r0, CONFIG_SYS_IBAT5U@h
648 ori r3, r3, CONFIG_SYS_IBAT5U@l
653 addis r4, r0, CONFIG_SYS_DBAT5L@h
654 ori r4, r4, CONFIG_SYS_DBAT5L@l
655 addis r3, r0, CONFIG_SYS_DBAT5U@h
656 ori r3, r3, CONFIG_SYS_DBAT5U@l
661 addis r4, r0, CONFIG_SYS_IBAT6L@h
662 ori r4, r4, CONFIG_SYS_IBAT6L@l
663 addis r3, r0, CONFIG_SYS_IBAT6U@h
664 ori r3, r3, CONFIG_SYS_IBAT6U@l
669 addis r4, r0, CONFIG_SYS_DBAT6L@h
670 ori r4, r4, CONFIG_SYS_DBAT6L@l
671 addis r3, r0, CONFIG_SYS_DBAT6U@h
672 ori r3, r3, CONFIG_SYS_DBAT6U@l
677 addis r4, r0, CONFIG_SYS_IBAT7L@h
678 ori r4, r4, CONFIG_SYS_IBAT7L@l
679 addis r3, r0, CONFIG_SYS_IBAT7U@h
680 ori r3, r3, CONFIG_SYS_IBAT7U@l
685 addis r4, r0, CONFIG_SYS_DBAT7L@h
686 ori r4, r4, CONFIG_SYS_DBAT7L@l
687 addis r3, r0, CONFIG_SYS_DBAT7U@h
688 ori r3, r3, CONFIG_SYS_DBAT7U@l
695 /* invalidate all tlb's
697 * From the 603e User Manual: "The 603e provides the ability to
698 * invalidate a TLB entry. The TLB Invalidate Entry (tlbie)
699 * instruction invalidates the TLB entry indexed by the EA, and
700 * operates on both the instruction and data TLBs simultaneously
701 * invalidating four TLB entries (both sets in each TLB). The
702 * index corresponds to bits 15-19 of the EA. To invalidate all
703 * entries within both TLBs, 32 tlbie instructions should be
704 * issued, incrementing this field by one each time."
706 * "Note that the tlbia instruction is not implemented on the
709 * bits 15-19 correspond to addresses 0x00000000 to 0x0001F000
710 * incrementing by 0x1000 each time. The code below is sort of
711 * based on code in "flush_tlbs" from arch/powerpc/kernel/head.S
727 * Note: requires that all cache bits in
728 * HID0 are in the low half word.
730 #ifndef CONFIG_NAND_SPL
735 li r4, HID0_ICFI|HID0_ILOCK
737 ori r4, r3, HID0_ICFI
739 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
741 mtspr HID0, r3 /* clears invalidate */
744 .globl icache_disable
748 ori r4, r4, HID0_ICE|HID0_ICFI|HID0_ILOCK
751 mtspr HID0, r3 /* clears invalidate, enable and lock */
757 rlwinm r3, r3, (31 - HID0_ICE_SHIFT + 1), 31, 31
759 #endif /* !CONFIG_NAND_SPL */
764 li r5, HID0_DCFI|HID0_DLOCK
768 mtspr HID0, r3 /* enable, no invalidate */
771 .globl dcache_disable
774 bl flush_dcache /* uses r3 and r5 */
776 li r5, HID0_DCE|HID0_DLOCK
778 ori r5, r3, HID0_DCFI
780 mtspr HID0, r5 /* sets invalidate, clears enable and lock */
782 mtspr HID0, r3 /* clears invalidate */
789 rlwinm r3, r3, (31 - HID0_DCE_SHIFT + 1), 31, 31
795 lis r5, CONFIG_SYS_CACHELINE_SIZE
799 lis r5, CONFIG_SYS_CACHELINE_SIZE
804 /*-------------------------------------------------------------------*/
807 * void relocate_code (addr_sp, gd, addr_moni)
809 * This "function" does not return, instead it continues in RAM
810 * after relocating the monitor code.
814 * r5 = length in bytes
819 mr r1, r3 /* Set new stack pointer */
820 mr r9, r4 /* Save copy of Global Data pointer */
821 mr r10, r5 /* Save copy of Destination Address */
824 mr r3, r5 /* Destination Address */
825 lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
826 ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
827 lwz r5, GOT(__bss_start)
829 li r6, CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */
834 * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE)
835 * + Destination Address
841 /* First our own GOT */
843 /* then the one used by the C code */
853 beq cr1,4f /* In place copy is not necessary */
854 beq 7f /* Protect against 0 count */
883 2: slwi r0,r0,2 /* re copy in reverse order ... y do we needed it? */
891 * Now flush the cache: note that we must start from a cache aligned
892 * address. Otherwise we might miss one cache line.
896 beq 7f /* Always flush prefetch queue in any case */
904 sync /* Wait for all dcbst to complete on bus */
910 7: sync /* Wait for all icbi to complete on bus */
914 * We are done. Do not return, instead branch to second part of board
915 * initialization, now running from RAM.
917 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
924 * Relocation Function, r12 point to got2+0x8000
926 * Adjust got2 pointers, no need to check for 0, this code
927 * already puts a few entries in the table.
929 li r0,__got2_entries@sectoff@l
930 la r3,GOT(_GOT2_TABLE_)
931 lwz r11,GOT(_GOT2_TABLE_)
942 #ifndef CONFIG_NAND_SPL
944 * Now adjust the fixups and the pointers to the fixups
945 * in case we need to move ourselves again.
947 li r0,__fixup_entries@sectoff@l
948 lwz r3,GOT(_FIXUP_TABLE_)
966 * Now clear BSS segment
968 lwz r3,GOT(__bss_start)
969 #if defined(CONFIG_HYMOD)
971 * For HYMOD - the environment is the very last item in flash.
972 * The real .bss stops just before environment starts, so only
973 * clear up to that point.
975 * taken from mods for FADS board
977 lwz r4,GOT(environment)
993 mr r3, r9 /* Global Data pointer */
994 mr r4, r10 /* Destination Address */
997 #ifndef CONFIG_NAND_SPL
999 * Copy exception vector code to low memory
1002 * r7: source address, r8: end address, r9: target address
1006 mflr r4 /* save link register */
1009 lwz r8, GOT(_end_of_vectors)
1011 li r9, 0x100 /* reset vector always at 0x100 */
1014 bgelr /* return if r7>=r8 - just in case */
1024 * relocate `hdlr' and `int_return' entries
1026 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1027 li r8, Alignment - _start + EXC_OFF_SYS_RESET
1030 addi r7, r7, 0x100 /* next exception vector */
1034 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1037 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1040 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1041 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
1044 addi r7, r7, 0x100 /* next exception vector */
1048 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
1049 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1052 addi r7, r7, 0x100 /* next exception vector */
1056 mfmsr r3 /* now that the vectors have */
1057 lis r7, MSR_IP@h /* relocated into low memory */
1058 ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */
1059 andc r3, r3, r7 /* (if it was on) */
1060 SYNC /* Some chip revs need this... */
1064 mtlr r4 /* restore link register */
1067 #endif /* !CONFIG_NAND_SPL */
1069 #ifdef CONFIG_SYS_INIT_RAM_LOCK
1071 /* Allocate Initial RAM in data cache.
1073 lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
1074 ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
1075 li r4, ((CONFIG_SYS_INIT_RAM_END & ~31) + \
1076 (CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
1083 /* Lock the data cache */
1085 ori r0, r0, HID0_DLOCK
1091 #ifndef CONFIG_NAND_SPL
1092 .globl unlock_ram_in_cache
1093 unlock_ram_in_cache:
1094 /* invalidate the INIT_RAM section */
1095 lis r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@h
1096 ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR & ~31)@l
1097 li r4, ((CONFIG_SYS_INIT_RAM_END & ~31) + \
1098 (CONFIG_SYS_INIT_RAM_ADDR & 31) + 31) / 32
1104 sync /* Wait for all icbi to complete on bus */
1107 /* Unlock the data cache and invalidate it */
1109 li r5, HID0_DLOCK|HID0_DCFI
1110 andc r3, r3, r5 /* no invalidate, unlock */
1111 ori r5, r3, HID0_DCFI /* invalidate, unlock */
1113 mtspr HID0, r5 /* invalidate, unlock */
1115 mtspr HID0, r3 /* no invalidate, unlock */
1117 #endif /* !CONFIG_NAND_SPL */
1118 #endif /* CONFIG_SYS_INIT_RAM_LOCK */
1120 #ifdef CONFIG_SYS_FLASHBOOT
1122 /* When booting from ROM (Flash or EPROM), clear the */
1123 /* Address Mask in OR0 so ROM appears everywhere */
1124 /*----------------------------------------------------*/
1125 lis r3, (CONFIG_SYS_IMMR)@h /* r3 <= CONFIG_SYS_IMMR */
1127 li r5, 0x7fff /* r5 <= 0x00007FFFF */
1129 stw r4, OR0@l(r3) /* OR0 <= OR0 & 0x00007FFFF */
1131 /* As MPC8349E User's Manual presented, when RCW[BMS] is set to 0,
1132 * system will boot from 0x0000_0100, and the LBLAWBAR0[BASE_ADDR]
1133 * reset value is 0x00000; when RCW[BMS] is set to 1, system will boot
1134 * from 0xFFF0_0100, and the LBLAWBAR0[BASE_ADDR] reset value is
1135 * 0xFF800. From the hard resetting to here, the processor fetched and
1136 * executed the instructions one by one. There is not absolutely
1137 * jumping happened. Laterly, the u-boot code has to do an absolutely
1138 * jumping to tell the CPU instruction fetching component what the
1139 * u-boot TEXT base address is. Because the TEXT base resides in the
1140 * boot ROM memory space, to garantee the code can run smoothly after
1141 * that jumping, we must map in the entire boot ROM by Local Access
1142 * Window. Sometimes, we desire an non-0x00000 or non-0xFF800 starting
1143 * address for boot ROM, such as 0xFE000000. In this case, the default
1144 * LBIU Local Access Widow 0 will not cover this memory space. So, we
1145 * need another window to map in it.
1147 lis r4, (CONFIG_SYS_FLASH_BASE)@h
1148 ori r4, r4, (CONFIG_SYS_FLASH_BASE)@l
1149 stw r4, LBLAWBAR1(r3) /* LBLAWBAR1 <= CONFIG_SYS_FLASH_BASE */
1151 /* Store 0x80000012 + log2(CONFIG_SYS_FLASH_SIZE) into LBLAWAR1 */
1152 lis r4, (0x80000012)@h
1153 ori r4, r4, (0x80000012)@l
1154 li r5, CONFIG_SYS_FLASH_SIZE
1155 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
1159 stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */
1162 /* Though all the LBIU Local Access Windows and LBC Banks will be
1163 * initialized in the C code, we'd better configure boot ROM's
1164 * window 0 and bank 0 correctly at here.
1166 remap_flash_by_law0:
1167 /* Initialize the BR0 with the boot ROM starting address. */
1171 lis r5, (CONFIG_SYS_FLASH_BASE & 0xFFFF8000)@h
1172 ori r5, r5, (CONFIG_SYS_FLASH_BASE & 0xFFFF8000)@l
1174 stw r5, BR0(r3) /* r5 <= (CONFIG_SYS_FLASH_BASE & 0xFFFF8000) | (BR0 & 0x00007FFF) */
1177 lis r5, ~((CONFIG_SYS_FLASH_SIZE << 4) - 1)
1181 lis r4, (CONFIG_SYS_FLASH_BASE)@h
1182 ori r4, r4, (CONFIG_SYS_FLASH_BASE)@l
1183 stw r4, LBLAWBAR0(r3) /* LBLAWBAR0 <= CONFIG_SYS_FLASH_BASE */
1185 /* Store 0x80000012 + log2(CONFIG_SYS_FLASH_SIZE) into LBLAWAR0 */
1186 lis r4, (0x80000012)@h
1187 ori r4, r4, (0x80000012)@l
1188 li r5, CONFIG_SYS_FLASH_SIZE
1189 1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
1192 stw r4, LBLAWAR0(r3) /* LBLAWAR0 <= Flash Size */
1196 stw r4, LBLAWBAR1(r3)
1197 stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */
1199 #endif /* CONFIG_SYS_FLASHBOOT */