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>
6 * See file CREDITS for list of people who contributed to this
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 * U-Boot - Startup Code for MPC8260 PowerPC based Embedded Boards
28 #include <asm-offsets.h>
31 #include <timestamp.h>
34 #define CONFIG_8260 1 /* needed for Linux kernel header files */
35 #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
37 #include <ppc_asm.tmpl>
40 #include <asm/cache.h>
42 #include <asm/u-boot.h>
44 #ifndef CONFIG_IDENT_STRING
45 #define CONFIG_IDENT_STRING ""
48 /* We don't want the MMU yet.
51 /* Floating Point enable, Machine Check and Recoverable Interr. */
53 #define MSR_KERNEL (MSR_FP|MSR_RI)
55 #define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
59 * Set up GOT: Global Offset Table
61 * Use r12 to access the GOT
64 GOT_ENTRY(_GOT2_TABLE_)
65 GOT_ENTRY(_FIXUP_TABLE_)
68 GOT_ENTRY(_start_of_vectors)
69 GOT_ENTRY(_end_of_vectors)
70 GOT_ENTRY(transfer_to_handler)
73 GOT_ENTRY(__bss_end__)
74 GOT_ENTRY(__bss_start)
75 #if defined(CONFIG_HYMOD)
76 GOT_ENTRY(environment)
81 * Version string - must be in data segment because MPC8260 uses the first
82 * 256 bytes for the Hard Reset Configuration Word table (see below).
83 * Similarly, can't have the U-Boot Magic Number as the first thing in
84 * the image - don't know how this will affect the image tools, but I guess
91 .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
92 .ascii CONFIG_IDENT_STRING, "\0"
95 * Hard Reset Configuration Word (HRCW) table
97 * The Hard Reset Configuration Word (HRCW) sets a number of useful things
98 * such as whether there is an external memory controller, whether the
99 * PowerPC core is disabled (i.e. only the communications processor is
100 * active, accessed by another CPU on the bus), whether using external
101 * arbitration, external bus mode, boot port size, core initial prefix,
102 * internal space base, boot memory space, etc.
104 * These things dictate where the processor begins execution, where the
105 * boot ROM appears in memory, the memory controller setup when access
106 * boot ROM, etc. The HRCW is *extremely* important.
108 * The HRCW is read from the bus during reset. One CPU on the bus will
109 * be a hard reset configuration master, any others will be hard reset
110 * configuration slaves. The master reads eight HRCWs from flash during
111 * reset - the first it uses for itself, the other 7 it communicates to
112 * up to 7 configuration slaves by some complicated mechanism, which is
113 * not really important here.
115 * The configuration master performs 32 successive reads starting at address
116 * 0 and incrementing by 8 each read (i.e. on 64 bit boundaries) but only 8
117 * bits is read, and always from byte lane D[0-7] (so that port size of the
118 * boot device does not matter). The first four reads form the 32 bit HRCW
119 * for the master itself. The second four reads form the HRCW for the first
120 * slave, and so on, up to seven slaves. The 32 bit HRCW is formed by
121 * concatenating the four bytes, with the first read placed in byte 0 (the
122 * most significant byte), and so on with the fourth read placed in byte 3
123 * (the least significant byte).
125 #define _HRCW_TABLE_ENTRY(w) \
126 .fill 8,1,(((w)>>24)&0xff); \
127 .fill 8,1,(((w)>>16)&0xff); \
128 .fill 8,1,(((w)>> 8)&0xff); \
129 .fill 8,1,(((w) )&0xff)
133 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_MASTER)
134 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE1)
135 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE2)
136 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE3)
137 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE4)
138 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE5)
139 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE6)
140 _HRCW_TABLE_ENTRY(CONFIG_SYS_HRCW_SLAVE7)
142 * After configuration, a system reset exception is executed using the
143 * vector at offset 0x100 relative to the base set by MSR[IP]. If MSR[IP]
144 * is 0, the base address is 0x00000000. If MSR[IP] is 1, the base address
145 * is 0xfff00000. In the case of a Power On Reset or Hard Reset, the value
146 * of MSR[IP] is determined by the CIP field in the HRCW.
148 * Other bits in the HRCW set up the Base Address and Port Size in BR0.
149 * This determines the location of the boot ROM (flash or EPROM) in the
150 * processor's address space at boot time. As long as the HRCW is set up
151 * so that we eventually end up executing the code below when the processor
152 * executes the reset exception, the actual values used should not matter.
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 be
159 * pulled out from under us, so to speak (it will be fine as long as we
160 * configure BR0 with the same boot ROM link address).
162 . = EXC_OFF_SYS_RESET
166 #if defined(CONFIG_MPC8260ADS) && defined(CONFIG_SYS_DEFAULT_IMMR)
167 lis r3, CONFIG_SYS_DEFAULT_IMMR@h
171 rlwinm r4, r4, 0, 8, 5
177 #endif /* CONFIG_MPC8260ADS && CONFIG_SYS_DEFAULT_IMMR */
179 mfmsr r5 /* save msr contents */
181 #if defined(CONFIG_COGENT)
182 /* this is what the cogent EPROM does */
187 #endif /* CONFIG_COGENT */
189 #if defined(CONFIG_SYS_DEFAULT_IMMR)
190 lis r3, CONFIG_SYS_IMMR@h
191 ori r3, r3, CONFIG_SYS_IMMR@l
192 lis r4, CONFIG_SYS_DEFAULT_IMMR@h
194 #endif /* CONFIG_SYS_DEFAULT_IMMR */
196 /* Initialise the MPC8260 processor core */
197 /*--------------------------------------------------------------*/
201 #ifndef CONFIG_SYS_RAMBOOT
202 /* When booting from ROM (Flash or EPROM), clear the */
203 /* Address Mask in OR0 so ROM appears everywhere */
204 /*--------------------------------------------------------------*/
206 lis r3, (CONFIG_SYS_IMMR+IM_REGBASE)@h
212 /* Calculate absolute address in FLASH and jump there */
213 /*--------------------------------------------------------------*/
215 lis r3, CONFIG_SYS_MONITOR_BASE@h
216 ori r3, r3, CONFIG_SYS_MONITOR_BASE@l
217 addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
222 #endif /* CONFIG_SYS_RAMBOOT */
224 /* initialize some things that are hard to access from C */
225 /*--------------------------------------------------------------*/
227 lis r3, CONFIG_SYS_IMMR@h /* set up stack in internal DPRAM */
228 ori r1, r3, CONFIG_SYS_INIT_SP_OFFSET
229 li r0, 0 /* Make room for stack frame header and */
230 stwu r0, -4(r1) /* clear final stack frame so that */
231 stwu r0, -4(r1) /* stack backtraces terminate cleanly */
233 /* let the C-code set up the rest */
235 /* Be careful to keep code relocatable ! */
236 /*--------------------------------------------------------------*/
238 GET_GOT /* initialize GOT access */
241 bl cpu_init_f /* run low-level CPU init code (in Flash)*/
244 bl init_debug /* set up debugging stuff */
247 bl board_init_f /* run 1st part of board init code (in Flash)*/
249 /* NOTREACHED - board_init_f() does not return */
255 .globl _start_of_vectors
259 STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
261 /* Data Storage exception. */
262 STD_EXCEPTION(0x300, DataStorage, UnknownException)
264 /* Instruction Storage exception. */
265 STD_EXCEPTION(0x400, InstStorage, UnknownException)
267 /* External Interrupt exception. */
268 STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
270 /* Alignment exception. */
273 EXCEPTION_PROLOG(SRR0, SRR1)
278 addi r3,r1,STACK_FRAME_OVERHEAD
279 EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
281 /* Program check exception */
284 EXCEPTION_PROLOG(SRR0, SRR1)
285 addi r3,r1,STACK_FRAME_OVERHEAD
286 EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
289 STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
291 /* I guess we could implement decrementer, and may have
292 * to someday for timekeeping.
294 STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
296 STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
297 STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
298 STD_EXCEPTION(0xc00, SystemCall, UnknownException)
299 STD_EXCEPTION(0xd00, SingleStep, UnknownException)
301 STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
302 STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
304 STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
305 STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
306 STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
310 * This exception occurs when the program counter matches the
311 * Instruction Address Breakpoint Register (IABR).
313 * I want the cpu to halt if this occurs so I can hunt around
314 * with the debugger and look at things.
316 * When DEBUG is defined, both machine check enable (in the MSR)
317 * and checkstop reset enable (in the reset mode register) are
318 * turned off and so a checkstop condition will result in the cpu
321 * I force the cpu into a checkstop condition by putting an illegal
322 * instruction here (at least this is the theory).
324 * well - that didnt work, so just do an infinite loop!
328 STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
330 STD_EXCEPTION(0x1400, SMI, UnknownException)
332 STD_EXCEPTION(0x1500, Trap_15, UnknownException)
333 STD_EXCEPTION(0x1600, Trap_16, UnknownException)
334 STD_EXCEPTION(0x1700, Trap_17, UnknownException)
335 STD_EXCEPTION(0x1800, Trap_18, UnknownException)
336 STD_EXCEPTION(0x1900, Trap_19, UnknownException)
337 STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
338 STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
339 STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
340 STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
341 STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
342 STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
343 STD_EXCEPTION(0x2000, Trap_20, UnknownException)
344 STD_EXCEPTION(0x2100, Trap_21, UnknownException)
345 STD_EXCEPTION(0x2200, Trap_22, UnknownException)
346 STD_EXCEPTION(0x2300, Trap_23, UnknownException)
347 STD_EXCEPTION(0x2400, Trap_24, UnknownException)
348 STD_EXCEPTION(0x2500, Trap_25, UnknownException)
349 STD_EXCEPTION(0x2600, Trap_26, UnknownException)
350 STD_EXCEPTION(0x2700, Trap_27, UnknownException)
351 STD_EXCEPTION(0x2800, Trap_28, UnknownException)
352 STD_EXCEPTION(0x2900, Trap_29, UnknownException)
353 STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
354 STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
355 STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
356 STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
357 STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
358 STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
361 .globl _end_of_vectors
367 * This code finishes saving the registers to the exception frame
368 * and jumps to the appropriate handler for the exception.
369 * Register r21 is pointer into trap frame, r1 has new stack pointer.
371 .globl transfer_to_handler
382 andi. r24,r23,0x3f00 /* get vector offset */
386 lwz r24,0(r23) /* virtual address of handler */
387 lwz r23,4(r23) /* where to go when done */
392 rfi /* jump to handler, enable MMU */
395 mfmsr r28 /* Disable interrupts */
399 SYNC /* Some chip revs need this... */
414 lwz r2,_NIP(r1) /* Restore environment */
424 #if defined(CONFIG_COGENT)
427 * This code initialises the MPC8260 processor core
428 * (conforms to PowerPC 603e spec)
431 .globl cogent_init_8260
434 /* Taken from page 14 of CMA282 manual */
435 /*--------------------------------------------------------------*/
437 lis r4, (CONFIG_SYS_IMMR+IM_REGBASE)@h
438 lis r3, CONFIG_SYS_IMMR@h
439 stw r3, IM_IMMR@l(r4)
440 lwz r3, IM_IMMR@l(r4)
442 lis r3, CONFIG_SYS_SYPCR@h
443 ori r3, r3, CONFIG_SYS_SYPCR@l
444 stw r3, IM_SYPCR@l(r4)
445 lwz r3, IM_SYPCR@l(r4)
447 lis r3, CONFIG_SYS_SCCR@h
448 ori r3, r3, CONFIG_SYS_SCCR@l
449 stw r3, IM_SCCR@l(r4)
450 lwz r3, IM_SCCR@l(r4)
453 /* the rest of this was disassembled from the */
454 /* EPROM code that came with my CMA282 CPU module */
455 /*--------------------------------------------------------------*/
469 /*--------------------------------------------------------------*/
473 #endif /* CONFIG_COGENT */
476 * This code initialises the MPC8260 processor core
477 * (conforms to PowerPC 603e spec)
478 * Note: expects original MSR contents to be in r5.
481 .globl init_8260_core
484 /* Initialize machine status; enable machine check interrupt */
485 /*--------------------------------------------------------------*/
487 li r3, MSR_KERNEL /* Set ME and RI flags */
488 rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */
490 rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */
492 SYNC /* Some chip revs need this... */
495 mtspr SRR1, r3 /* Make SRR1 match MSR */
497 /* Initialise the SYPCR early, and reset the watchdog (if req) */
498 /*--------------------------------------------------------------*/
500 lis r3, (CONFIG_SYS_IMMR+IM_REGBASE)@h
501 #if !defined(CONFIG_COGENT)
502 lis r4, CONFIG_SYS_SYPCR@h
503 ori r4, r4, CONFIG_SYS_SYPCR@l
504 stw r4, IM_SYPCR@l(r3)
505 #endif /* !CONFIG_COGENT */
506 #if defined(CONFIG_WATCHDOG)
507 li r4, 21868 /* = 0x556c */
508 sth r4, IM_SWSR@l(r3)
509 li r4, -21959 /* = 0xaa39 */
510 sth r4, IM_SWSR@l(r3)
511 #endif /* CONFIG_WATCHDOG */
513 /* Initialize the Hardware Implementation-dependent Registers */
514 /* HID0 also contains cache control */
515 /*--------------------------------------------------------------*/
517 lis r3, CONFIG_SYS_HID0_INIT@h
518 ori r3, r3, CONFIG_SYS_HID0_INIT@l
522 lis r3, CONFIG_SYS_HID0_FINAL@h
523 ori r3, r3, CONFIG_SYS_HID0_FINAL@l
527 lis r3, CONFIG_SYS_HID2@h
528 ori r3, r3, CONFIG_SYS_HID2@l
531 /* clear all BAT's */
532 /*--------------------------------------------------------------*/
553 /* invalidate all tlb's */
555 /* From the 603e User Manual: "The 603e provides the ability to */
556 /* invalidate a TLB entry. The TLB Invalidate Entry (tlbie) */
557 /* instruction invalidates the TLB entry indexed by the EA, and */
558 /* operates on both the instruction and data TLBs simultaneously*/
559 /* invalidating four TLB entries (both sets in each TLB). The */
560 /* index corresponds to bits 15-19 of the EA. To invalidate all */
561 /* entries within both TLBs, 32 tlbie instructions should be */
562 /* issued, incrementing this field by one each time." */
564 /* "Note that the tlbia instruction is not implemented on the */
567 /* bits 15-19 correspond to addresses 0x00000000 to 0x0001F000 */
568 /* incrementing by 0x1000 each time. The code below is sort of */
569 /* based on code in "flush_tlbs" from arch/powerpc/kernel/head.S */
571 /*--------------------------------------------------------------*/
582 /*--------------------------------------------------------------*/
589 * initialise things related to debugging.
591 * must be called after the global offset table (GOT) is initialised
592 * (GET_GOT) and after cpu_init_f() has executed.
598 lis r3, (CONFIG_SYS_IMMR+IM_REGBASE)@h
600 /* Quick and dirty hack to enable the RAM and copy the */
601 /* vectors so that we can take exceptions. */
602 /*--------------------------------------------------------------*/
603 /* write Memory Refresh Prescaler */
604 li r4, CONFIG_SYS_MPTPR
605 sth r4, IM_MPTPR@l(r3)
606 /* write 60x Refresh Timer */
607 li r4, CONFIG_SYS_PSRT
608 stb r4, IM_PSRT@l(r3)
609 /* init the 60x SDRAM Mode Register */
610 lis r4, (CONFIG_SYS_PSDMR|PSDMR_OP_NORM)@h
611 ori r4, r4, (CONFIG_SYS_PSDMR|PSDMR_OP_NORM)@l
612 stw r4, IM_PSDMR@l(r3)
613 /* write Precharge All Banks command */
614 lis r4, (CONFIG_SYS_PSDMR|PSDMR_OP_PREA)@h
615 ori r4, r4, (CONFIG_SYS_PSDMR|PSDMR_OP_PREA)@l
616 stw r4, IM_PSDMR@l(r3)
618 /* write eight CBR Refresh commands */
619 lis r4, (CONFIG_SYS_PSDMR|PSDMR_OP_CBRR)@h
620 ori r4, r4, (CONFIG_SYS_PSDMR|PSDMR_OP_CBRR)@l
621 stw r4, IM_PSDMR@l(r3)
630 /* write Mode Register Write command */
631 lis r4, (CONFIG_SYS_PSDMR|PSDMR_OP_MRW)@h
632 ori r4, r4, (CONFIG_SYS_PSDMR|PSDMR_OP_MRW)@l
633 stw r4, IM_PSDMR@l(r3)
635 /* write Normal Operation command and enable Refresh */
636 lis r4, (CONFIG_SYS_PSDMR|PSDMR_OP_NORM|PSDMR_RFEN)@h
637 ori r4, r4, (CONFIG_SYS_PSDMR|PSDMR_OP_NORM|PSDMR_RFEN)@l
638 stw r4, IM_PSDMR@l(r3)
640 /* RAM should now be operational */
642 #define VEC_WRD_CNT ((_end_of_vectors - _start + EXC_OFF_SYS_RESET) / 4)
646 lwz r3, GOT(_end_of_vectors)
647 rlwinm r4, r3, 0, 18, 31 /* _end_of_vectors & 0x3FFF */
648 lis r5, VEC_WRD_CNT@h
649 ori r5, r5, VEC_WRD_CNT@l
656 /* Load the Instruction Address Breakpoint Register (IABR). */
658 /* The address to load is stored in the first word of dual port */
659 /* ram and should be preserved while the power is on, so you */
660 /* can plug addresses into that location then reset the cpu and */
661 /* this code will load that address into the IABR after the */
664 /* When the program counter matches the contents of the IABR, */
665 /* an exception is generated (before the instruction at that */
666 /* location completes). The vector for this exception is 0x1300 */
667 /*--------------------------------------------------------------*/
668 lis r3, CONFIG_SYS_IMMR@h
672 /* Set the entire dual port RAM (where the initial stack */
673 /* resides) to a known value - makes it easier to see where */
674 /* the stack has been written */
675 /*--------------------------------------------------------------*/
676 lis r3, (CONFIG_SYS_IMMR + CONFIG_SYS_INIT_SP_OFFSET)@h
677 ori r3, r3, (CONFIG_SYS_IMMR + CONFIG_SYS_INIT_SP_OFFSET)@l
678 li r4, ((CONFIG_SYS_INIT_SP_OFFSET - 4) / 4)
681 ori r4, r4, 0xdeadbeaf@l
687 /*--------------------------------------------------------------*/
694 * Note: requires that all cache bits in
695 * HID0 are in the low half word.
702 ori r4, r4, HID0_ILOCK
704 ori r4, r3, HID0_ICFI
706 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
708 mtspr HID0, r3 /* clears invalidate */
711 .globl icache_disable
715 ori r4, r4, HID0_ICE|HID0_ILOCK
717 ori r4, r3, HID0_ICFI
719 mtspr HID0, r4 /* sets invalidate, clears enable and lock */
721 mtspr HID0, r3 /* clears invalidate */
727 rlwinm r3, r3, HID0_ICE_BITPOS + 1, 31, 31
735 ori r4, r4, HID0_DLOCK
739 mtspr HID0, r4 /* sets enable and invalidate, clears lock */
741 mtspr HID0, r3 /* clears invalidate */
744 .globl dcache_disable
748 ori r4, r4, HID0_DCE|HID0_DLOCK
752 mtspr HID0, r4 /* sets invalidate, clears enable and lock */
754 mtspr HID0, r3 /* clears invalidate */
760 rlwinm r3, r3, HID0_DCE_BITPOS + 1, 31, 31
768 /*------------------------------------------------------------------------------*/
771 * void relocate_code (addr_sp, gd, addr_moni)
773 * This "function" does not return, instead it continues in RAM
774 * after relocating the monitor code.
778 * r5 = length in bytes
783 mr r1, r3 /* Set new stack pointer */
784 mr r9, r4 /* Save copy of Global Data pointer */
785 mr r10, r5 /* Save copy of Destination Address */
788 mr r3, r5 /* Destination Address */
789 lis r4, CONFIG_SYS_MONITOR_BASE@h /* Source Address */
790 ori r4, r4, CONFIG_SYS_MONITOR_BASE@l
791 lwz r5, GOT(__init_end)
793 li r6, CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */
798 * New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE) + Destination Address
804 /* First our own GOT */
806 /* then the one used by the C code */
816 beq cr1,4f /* In place copy is not necessary */
817 beq 7f /* Protect against 0 count */
836 * Now flush the cache: note that we must start from a cache aligned
837 * address. Otherwise we might miss one cache line.
841 beq 7f /* Always flush prefetch queue in any case */
844 mfspr r7,HID0 /* don't do dcbst if dcache is disabled */
845 rlwinm r7,r7,HID0_DCE_BITPOS+1,31,31
853 sync /* Wait for all dcbst to complete on bus */
854 9: mfspr r7,HID0 /* don't do icbi if icache is disabled */
855 rlwinm r7,r7,HID0_ICE_BITPOS+1,31,31
863 7: sync /* Wait for all icbi to complete on bus */
867 * We are done. Do not return, instead branch to second part of board
868 * initialization, now running from RAM.
871 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
878 * Relocation Function, r12 point to got2+0x8000
880 * Adjust got2 pointers, no need to check for 0, this code
881 * already puts a few entries in the table.
883 li r0,__got2_entries@sectoff@l
884 la r3,GOT(_GOT2_TABLE_)
885 lwz r11,GOT(_GOT2_TABLE_)
897 * Now adjust the fixups and the pointers to the fixups
898 * in case we need to move ourselves again.
900 li r0,__fixup_entries@sectoff@l
901 lwz r3,GOT(_FIXUP_TABLE_)
917 * Now clear BSS segment
919 lwz r3,GOT(__bss_start)
920 #if defined(CONFIG_HYMOD)
922 * For HYMOD - the environment is the very last item in flash.
923 * The real .bss stops just before environment starts, so only
924 * clear up to that point.
926 * taken from mods for FADS board
928 lwz r4,GOT(environment)
930 lwz r4,GOT(__bss_end__)
944 mr r3, r9 /* Global Data pointer */
945 mr r4, r10 /* Destination Address */
949 * Copy exception vector code to low memory
952 * r7: source address, r8: end address, r9: target address
956 mflr r4 /* save link register */
959 lwz r8, GOT(_end_of_vectors)
961 li r9, 0x100 /* reset vector always at 0x100 */
964 bgelr /* return if r7>=r8 - just in case */
974 * relocate `hdlr' and `int_return' entries
976 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
977 li r8, Alignment - _start + EXC_OFF_SYS_RESET
980 addi r7, r7, 0x100 /* next exception vector */
984 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
987 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
990 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
991 li r8, SystemCall - _start + EXC_OFF_SYS_RESET
994 addi r7, r7, 0x100 /* next exception vector */
998 li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
999 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
1002 addi r7, r7, 0x100 /* next exception vector */
1006 mfmsr r3 /* now that the vectors have */
1007 lis r7, MSR_IP@h /* relocated into low memory */
1008 ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */
1009 andc r3, r3, r7 /* (if it was on) */
1010 SYNC /* Some chip revs need this... */
1014 mtlr r4 /* restore link register */