Initial revision

1 files changed, 1425 insertions, 0 deletions

diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S
new file mode 100644
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@@ -0,0 +1,1425 @@
+/*
+ *  Copyright (C) 1998	Dan Malek <dmalek@jlc.net>
+ *  Copyright (C) 1999	Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
+ *  Copyright (C) 2000,2001,2002 Wolfgang Denk <wd@denx.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+/*------------------------------------------------------------------------------+ */
+/* */
+/*	 This source code has been made available to you by IBM on an AS-IS */
+/*	 basis.	 Anyone receiving this source is licensed under IBM */
+/*	 copyrights to use it in any way he or she deems fit, including */
+/*	 copying it, modifying it, compiling it, and redistributing it either */
+/*	 with or without modifications.	 No license under IBM patents or */
+/*	 patent applications is to be implied by the copyright license. */
+/* */
+/*	 Any user of this software should understand that IBM cannot provide */
+/*	 technical support for this software and will not be responsible for */
+/*	 any consequences resulting from the use of this software. */
+/* */
+/*	 Any person who transfers this source code or any derivative work */
+/*	 must include the IBM copyright notice, this paragraph, and the */
+/*	 preceding two paragraphs in the transferred software. */
+/* */
+/*	 COPYRIGHT   I B M   CORPORATION 1995 */
+/*	 LICENSED MATERIAL  -  PROGRAM PROPERTY OF I B M */
+/*------------------------------------------------------------------------------- */
+
+/*  U-Boot - Startup Code for IBM 4xx PowerPC based Embedded Boards
+ *
+ *
+ *  The processor starts at 0xfffffffc and the code is executed
+ *  from flash/rom.
+ *  in memory, but as long we don't jump around before relocating.
+ *  board_init lies at a quite high address and when the cpu has
+ *  jumped there, everything is ok.
+ *  This works because the cpu gives the FLASH (CS0) the whole
+ *  address space at startup, and board_init lies as a echo of
+ *  the flash somewhere up there in the memorymap.
+ *
+ *  board_init will change CS0 to be positioned at the correct
+ *  address and (s)dram will be positioned at address 0
+ */
+#include <config.h>
+#include <mpc8xx.h>
+#include <ppc4xx.h>
+#include <version.h>
+
+#define _LINUX_CONFIG_H 1	/* avoid reading Linux autoconf.h file	*/
+
+#include <ppc_asm.tmpl>
+#include <ppc_defs.h>
+
+#include <asm/cache.h>
+#include <asm/mmu.h>
+
+#ifndef	 CONFIG_IDENT_STRING
+#define	 CONFIG_IDENT_STRING ""
+#endif
+
+#ifdef CFG_INIT_DCACHE_CS
+# if (CFG_INIT_DCACHE_CS == 0)
+#  define PBxAP pb0ap
+#  define PBxCR pb0cr
+# endif
+# if (CFG_INIT_DCACHE_CS == 1)
+#  define PBxAP pb1ap
+#  define PBxCR pb1cr
+# endif
+# if (CFG_INIT_DCACHE_CS == 2)
+#  define PBxAP pb2ap
+#  define PBxCR pb2cr
+# endif
+# if (CFG_INIT_DCACHE_CS == 3)
+#  define PBxAP pb3ap
+#  define PBxCR pb3cr
+# endif
+# if (CFG_INIT_DCACHE_CS == 4)
+#  define PBxAP pb4ap
+#  define PBxCR pb4cr
+# endif
+# if (CFG_INIT_DCACHE_CS == 5)
+#  define PBxAP pb5ap
+#  define PBxCR pb5cr
+# endif
+# if (CFG_INIT_DCACHE_CS == 6)
+#  define PBxAP pb6ap
+#  define PBxCR pb6cr
+# endif
+# if (CFG_INIT_DCACHE_CS == 7)
+#  define PBxAP pb7ap
+#  define PBxCR pb7cr
+# endif
+#endif /* CFG_INIT_DCACHE_CS */
+
+/* We don't want the  MMU yet.
+*/
+#undef	MSR_KERNEL
+#define MSR_KERNEL ( MSR_ME  )	/* Machine Check */
+
+
+	.extern ext_bus_cntlr_init
+	.extern sdram_init
+
+/*
+ * Set up GOT: Global Offset Table
+ *
+ * Use r14 to access the GOT
+ */
+	START_GOT
+	GOT_ENTRY(_GOT2_TABLE_)
+	GOT_ENTRY(_FIXUP_TABLE_)
+
+	GOT_ENTRY(_start)
+	GOT_ENTRY(_start_of_vectors)
+	GOT_ENTRY(_end_of_vectors)
+	GOT_ENTRY(transfer_to_handler)
+
+	GOT_ENTRY(_end)
+	GOT_ENTRY(.bss)
+	END_GOT
+
+/*
+ * 440 Startup -- on reset only the top 4k of the effective
+ * address space is mapped in by an entry in the instruction
+ * and data shadow TLB. The .bootpg section is located in the
+ * top 4k & does only what's necessary to map in the the rest
+ * of the boot rom. Once the boot rom is mapped in we can
+ * proceed with normal startup.
+ *
+ * NOTE: CS0 only covers the top 2MB of the effective address
+ * space after reset.
+ */
+
+#if defined(CONFIG_440)
+    .section .bootpg,"ax"
+    .globl _start_440
+
+/**************************************************************************/
+_start_440:
+	/*----------------------------------------------------------------*/
+	/* Clear and set up some registers. */
+	/*----------------------------------------------------------------*/
+	iccci	r0,r0           /* NOTE: operands not used for 440 */
+	dccci	r0,r0           /* NOTE: operands not used for 440 */
+	sync
+	li	r0,0
+	mtspr	srr0,r0
+	mtspr	srr1,r0
+	mtspr	csrr0,r0
+	mtspr	csrr1,r0
+
+	/*----------------------------------------------------------------*/
+	/* Initialize debug */
+	/*----------------------------------------------------------------*/
+	mtspr	dbcr0,r0
+	mtspr	dbcr1,r0
+	mtspr	dbcr2,r0
+	mtspr	iac1,r0
+	mtspr	iac2,r0
+	mtspr	iac3,r0
+	mtspr	dac1,r0
+	mtspr	dac2,r0
+	mtspr	dvc1,r0
+	mtspr	dvc2,r0
+
+	mfspr	r1,dbsr
+	mtspr	dbsr,r1		/* Clear all valid bits */
+
+	/*----------------------------------------------------------------*/
+	/* CCR0 init */
+	/*----------------------------------------------------------------*/
+	/* Disable store gathering & broadcast, guarantee inst/data
+	* cache block touch, force load/store alignment
+	* (see errata 1.12: 440_33)
+	*/
+	lis	r1,0x0030	/* store gathering & broadcast disable */
+	ori	r1,r1,0x6000	/* cache touch */
+	mtspr	ccr0,r1
+
+	/*----------------------------------------------------------------*/
+	/* Setup interrupt vectors */
+	/*----------------------------------------------------------------*/
+	mtspr	ivpr,r0		/* Vectors start at 0x0000_0000 */
+	li      r1,0x0100
+	mtspr	ivor0,r1	/* Critical input */
+	li      r1,0x0200
+	mtspr	ivor1,r1	/* Machine check */
+	li      r1,0x0300
+	mtspr	ivor2,r1	/* Data storage */
+	li      r1,0x0400
+	mtspr	ivor3,r1	/* Instruction storage */
+	li	r1,0x0500
+	mtspr	ivor4,r1	/* External interrupt */
+	li	r1,0x0600
+	mtspr	ivor5,r1	/* Alignment */
+	li	r1,0x0700
+	mtspr	ivor6,r1	/* Program check */
+	li	r1,0x0800
+	mtspr	ivor7,r1	/* Floating point unavailable */
+	li	r1,0x0c00
+	mtspr	ivor8,r1	/* System call */
+	li	r1,0x1000
+	mtspr	ivor10,r1	/* Decrementer (PIT for 440) */
+	li	r1,0x1400
+	mtspr	ivor13,r1	/* Data TLB error */
+	li	r1,0x1300
+	mtspr	ivor14,r1	/* Instr TLB error */
+	li	r1,0x2000
+	mtspr	ivor15,r1	/* Debug */
+
+	/*----------------------------------------------------------------*/
+	/* Configure cache regions  */
+	/*----------------------------------------------------------------*/
+	mtspr	inv0,r0
+	mtspr	inv1,r0
+	mtspr	inv2,r0
+	mtspr	inv3,r0
+	mtspr	dnv0,r0
+	mtspr	dnv1,r0
+	mtspr	dnv2,r0
+	mtspr	dnv3,r0
+	mtspr	itv0,r0
+	mtspr	itv1,r0
+	mtspr	itv2,r0
+	mtspr	itv3,r0
+	mtspr	dtv0,r0
+	mtspr	dtv1,r0
+	mtspr	dtv2,r0
+	mtspr	dtv3,r0
+
+	/*----------------------------------------------------------------*/
+	/* Cache victim limits */
+	/*----------------------------------------------------------------*/
+	/* floors 0, ceiling max to use the entire cache -- nothing locked
+	*/
+	lis	r1,0x0001
+	ori	r1,r1,0xf800
+	mtspr	ivlim,r1
+	mtspr	dvlim,r1
+
+	/*----------------------------------------------------------------*/
+	/* Clear all TLB entries -- TID = 0, TS = 0 */
+	/*----------------------------------------------------------------*/
+	mtspr	mmucr,r0
+	li	r1,0x003f	/* 64 TLB entries */
+	mtctr	r1
+0:	tlbwe	r0,r1,0x0000	/* Invalidate all entries (V=0)*/
+	subi	r1,r1,0x0001
+	bdnz	0b
+
+	/*----------------------------------------------------------------*/
+	/* TLB entry setup -- step thru tlbtab */
+	/*----------------------------------------------------------------*/
+	bl	tlbtab		/* Get tlbtab pointer */
+	mr	r5,r0
+	li	r1,0x003f	/* 64 TLB entries max */
+	mtctr	r1
+	li	r4,0		/* TLB # */
+
+	addi	r5,r5,-4
+1:	lwzu	r0,4(r5)
+	cmpwi	r0,0
+	beq	2f		/* 0 marks end */
+	lwzu	r1,4(r5)
+	lwzu	r2,4(r5)
+	tlbwe	r0,r4,0		/* TLB Word 0 */
+	tlbwe	r1,r4,1		/* TLB Word 1 */
+	tlbwe	r2,r4,2		/* TLB Word 2 */
+	addi	r4,r4,1		/* Next TLB */
+	bdnz	1b
+
+	/*----------------------------------------------------------------*/
+	/* Continue from 'normal' start */
+	/*----------------------------------------------------------------*/
+2:	bl	3f
+	b	_start
+
+3:	li	r0,0
+	mtspr	srr1,r0		/* Keep things disabled for now */
+	mflr	r1
+	mtspr	srr0,r1
+	rfi
+#endif
+
+/*
+ * r3 - 1st arg to board_init(): IMMP pointer
+ * r4 - 2nd arg to board_init(): boot flag
+ */
+	.text
+	.long	0x27051956		/* U-Boot Magic Number			*/
+	.globl	version_string
+version_string:
+	.ascii U_BOOT_VERSION
+	.ascii " (", __DATE__, " - ", __TIME__, ")"
+	.ascii CONFIG_IDENT_STRING, "\0"
+
+/*
+ * Maybe this should be moved somewhere else because the current
+ * location (0x100) is where the CriticalInput Execption should be.
+ */
+	. = EXC_OFF_SYS_RESET
+	.globl	_start
+_start:
+
+/*****************************************************************************/
+#if defined(CONFIG_440)
+
+	/*----------------------------------------------------------------*/
+	/* Clear and set up some registers. */
+	/*----------------------------------------------------------------*/
+	li	r0,0x0000
+	lis	r1,0xffff
+	mtspr	dec,r0			/* prevent dec exceptions */
+	mtspr	tbl,r0			/* prevent fit & wdt exceptions */
+	mtspr	tbu,r0
+	mtspr	tsr,r1			/* clear all timer exception status */
+	mtspr	tcr,r0			/* disable all */
+	mtspr	esr,r0			/* clear exception syndrome register */
+	mtxer	r0			/* clear integer exception register */
+	lis	r1,0x0002		/* set CE bit (Critical Exceptions) */
+	ori	r1,r1,0x1000		/* set ME bit (Machine Exceptions) */
+	mtmsr	r1			/* change MSR */
+
+	/*----------------------------------------------------------------*/
+	/* Debug setup -- some (not very good) ice's need an event*/
+	/* to establish control :-( Define CFG_INIT_DBCR to the dbsr */
+	/* value you need in this case 0x8cff 0000 should do the trick */
+	/*----------------------------------------------------------------*/
+#if defined(CFG_INIT_DBCR)
+	lis	r1,0xffff
+	ori	r1,r1,0xffff
+	mtspr	dbsr,r1			/* Clear all status bits */
+	lis	r0,CFG_INIT_DBCR@h
+	ori	r0,r0,CFG_INIT_DBCR@l
+	mtspr	dbcr0,r0
+	isync
+#endif
+
+	/*----------------------------------------------------------------*/
+	/* Setup the internal SRAM */
+	/*----------------------------------------------------------------*/
+	li	r0,0
+	mtdcr	isram0_sb1cr,r0		/* Disable bank 1 */
+
+	li	r2,0x7fff
+	ori	r2,r2,0xffff
+	mfdcr	r1,isram0_dpc
+	and	r1,r1,r2		/* Disable parity check */
+	mtdcr	isram0_dpc,r1
+	mfdcr	r1,isram0_pmeg
+	andis.	r1,r1,r2		/* Disable pwr mgmt */
+	mtdcr	isram0_pmeg,r1
+
+	lis	r1,0x8000		/* BAS = 8000_0000 */
+	ori	r1,r1,0x0380		/* 8k rw */
+	mtdcr	isram0_sb0cr,r1
+
+	/*----------------------------------------------------------------*/
+	/* Setup the stack in internal SRAM */
+	/*----------------------------------------------------------------*/
+	lis	r1,CFG_INIT_RAM_ADDR@h
+	ori	r1,r1,CFG_INIT_SP_OFFSET@l
+
+	li	r0,0
+	stwu	r0,-4(r1)
+	stwu	r0,-4(r1)		/* Terminate call chain */
+
+	stwu	r1,-8(r1)		/* Save back chain and move SP */
+	lis	r0,RESET_VECTOR@h	/* Address of reset vector */
+	ori	r0,r0, RESET_VECTOR@l
+	stwu	r1,-8(r1)		/* Save back chain and move SP */
+	stw	r0,+12(r1)		/* Save return addr (underflow vect) */
+
+	GET_GOT
+	bl	board_init_f
+
+#endif /* CONFIG_440 */
+
+/*****************************************************************************/
+#ifdef CONFIG_IOP480
+	/*----------------------------------------------------------------------- */
+	/* Set up some machine state registers. */
+	/*----------------------------------------------------------------------- */
+	addi	r0,r0,0x0000		/* initialize r0 to zero */
+	mtspr	esr,r0			/* clear Exception Syndrome Reg */
+	mttcr	r0			/* timer control register */
+	mtexier r0			/* disable all interrupts */
+	addi	r4,r0,0x1000		/* set ME bit (Machine Exceptions) */
+	oris	r4,r4,0x2		/* set CE bit (Critical Exceptions) */
+	mtmsr	r4			/* change MSR */
+	addis	r4,r0,0xFFFF		/* set r4 to 0xFFFFFFFF (status in the */
+	ori	r4,r4,0xFFFF		/* dbsr is cleared by setting bits to 1) */
+	mtdbsr	r4			/* clear/reset the dbsr */
+	mtexisr r4			/* clear all pending interrupts */
+	addis	r4,r0,0x8000
+	mtexier r4			/* enable critical exceptions */
+	addis	r4,r0,0x0000		/* assume 403GCX - enable core clk */
+	ori	r4,r4,0x4020		/* dbling (no harm done on GA and GC */
+	mtiocr	r4			/* since bit not used) & DRC to latch */
+					/* data bus on rising edge of CAS */
+	/*----------------------------------------------------------------------- */
+	/* Clear XER. */
+	/*----------------------------------------------------------------------- */
+	mtxer	r0
+	/*----------------------------------------------------------------------- */
+	/* Invalidate i-cache and d-cache TAG arrays. */
+	/*----------------------------------------------------------------------- */
+	addi	r3,0,1024		/* 1/4 of I-cache size, half of D-cache */
+	addi	r4,0,1024		/* 1/4 of I-cache */
+..cloop:
+	iccci	0,r3
+	iccci	r4,r3
+	dccci	0,r3
+	addic.	r3,r3,-16		/* move back one cache line */
+	bne	..cloop			/* loop back to do rest until r3 = 0 */
+
+	/* */
+	/* initialize IOP480 so it can read 1 MB code area for SRAM spaces */
+	/* this requires enabling MA[17..0], by default only MA[12..0] are enabled. */
+	/* */
+
+	/* first copy IOP480 register base address into r3 */
+	addis	r3,0,0x5000		/* IOP480 register base address hi */
+/*	ori	r3,r3,0x0000		/  IOP480 register base address lo */
+
+#ifdef CONFIG_ADCIOP
+	/* use r4 as the working variable */
+	/* turn on CS3 (LOCCTL.7) */
+	lwz	r4,0x84(r3)		/* LOCTL is at offset 0x84 */
+	andi.	r4,r4,0xff7f		/* make bit 7 = 0 -- CS3 mode */
+	stw	r4,0x84(r3)		/* LOCTL is at offset 0x84 */
+#endif
+
+#ifdef CONFIG_DASA_SIM
+	/* use r4 as the working variable */
+	/* turn on MA17 (LOCCTL.7) */
+	lwz	r4,0x84(r3)		/* LOCTL is at offset 0x84 */
+	ori	r4,r4,0x80		/* make bit 7 = 1 -- MA17 mode */
+	stw	r4,0x84(r3)		/* LOCTL is at offset 0x84 */
+#endif
+
+	/* turn on MA16..13 (LCS0BRD.12 = 0) */
+	lwz	r4,0x100(r3)		/* LCS0BRD is at offset 0x100 */
+	andi.	r4,r4,0xefff		/* make bit 12 = 0 */
+	stw	r4,0x100(r3)		/* LCS0BRD is at offset 0x100 */
+
+	/* make sure above stores all comlete before going on */
+	sync
+
+	/* last thing, set local init status done bit (DEVINIT.31) */
+	lwz	r4,0x80(r3)		/* DEVINIT is at offset 0x80 */
+	oris	r4,r4,0x8000		/* make bit 31 = 1 */
+	stw	r4,0x80(r3)		/* DEVINIT is at offset 0x80 */
+
+	/* clear all pending interrupts and disable all interrupts */
+	li	r4,-1			/* set p1 to 0xffffffff */
+	stw	r4,0x1b0(r3)		/* clear all pending interrupts */
+	stw	r4,0x1b8(r3)		/* clear all pending interrupts */
+	li	r4,0			/* set r4 to 0 */
+	stw	r4,0x1b4(r3)		/* disable all interrupts */
+	stw	r4,0x1bc(r3)		/* disable all interrupts */
+
+	/* make sure above stores all comlete before going on */
+	sync
+
+	/*----------------------------------------------------------------------- */
+	/* Enable two 128MB cachable regions. */
+	/*----------------------------------------------------------------------- */
+	addis	r1,r0,0x8000
+	addi	r1,r1,0x0001
+	mticcr	r1			/* instruction cache */
+
+	addis	r1,r0,0x0000
+	addi	r1,r1,0x0000
+	mtdccr	r1			/* data cache */
+
+	addis	r1,r0,CFG_INIT_RAM_ADDR@h
+	ori	r1,r1,CFG_INIT_SP_OFFSET	  /* set up the stack to SDRAM */
+	li	r0, 0			/* Make room for stack frame header and */
+	stwu	r0, -4(r1)		/* clear final stack frame so that	*/
+	stwu	r0, -4(r1)		/* stack backtraces terminate cleanly	*/
+
+	GET_GOT			/* initialize GOT access			*/
+
+	bl	board_init_f	/* run first part of init code (from Flash)	*/
+
+#endif	/* CONFIG_IOP480 */
+
+/*****************************************************************************/
+#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405)
+	/*----------------------------------------------------------------------- */
+	/* Clear and set up some registers. */
+	/*----------------------------------------------------------------------- */
+	addi	r4,r0,0x0000
+	mtspr	sgr,r4
+	mtspr	dcwr,r4
+	mtesr	r4			/* clear Exception Syndrome Reg */
+	mttcr	r4			/* clear Timer Control Reg */
+	mtxer	r4			/* clear Fixed-Point Exception Reg */
+	mtevpr	r4			/* clear Exception Vector Prefix Reg */
+	addi	r4,r0,0x1000		/* set ME bit (Machine Exceptions) */
+	oris	r4,r4,0x0002		/* set CE bit (Critical Exceptions) */
+	mtmsr	r4			/* change MSR */
+	addi	r4,r0,(0xFFFF-0x10000)		/* set r4 to 0xFFFFFFFF (status in the */
+					/* dbsr is cleared by setting bits to 1) */
+	mtdbsr	r4			/* clear/reset the dbsr */
+
+	/*----------------------------------------------------------------------- */
+	/* Invalidate I and D caches. Enable I cache for defined memory regions */
+	/* to speed things up. Leave the D cache disabled for now. It will be */
+	/* enabled/left disabled later based on user selected menu options. */
+	/* Be aware that the I cache may be disabled later based on the menu */
+	/* options as well. See miscLib/main.c. */
+	/*----------------------------------------------------------------------- */
+	bl	invalidate_icache
+	bl	invalidate_dcache
+
+	/*----------------------------------------------------------------------- */
+	/* Enable two 128MB cachable regions. */
+	/*----------------------------------------------------------------------- */
+	addis	r4,r0,0x8000
+	addi	r4,r4,0x0001
+	mticcr	r4			/* instruction cache */
+	isync
+
+	addis	r4,r0,0x0000
+	addi	r4,r4,0x0000
+	mtdccr	r4			/* data cache */
+
+#if !(defined(CFG_EBC_PB0AP) && defined(CFG_EBC_PB0CR))
+	/*----------------------------------------------------------------------- */
+	/* Tune the speed and size for flash CS0  */
+	/*----------------------------------------------------------------------- */
+	bl	ext_bus_cntlr_init
+#endif
+
+#if defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE)
+	/********************************************************************
+	 * Setup OCM - On Chip Memory
+	 *******************************************************************/
+	/* Setup OCM */
+ 	lis	r0, 0x7FFF
+ 	ori	r0, r0, 0xFFFF
+ 	mfdcr	r3, ocmiscntl 		/* get instr-side IRAM config */
+ 	mfdcr	r4, ocmdscntl	/* get data-side IRAM config */
+ 	and	r3, r3, r0	/* disable data-side IRAM */
+ 	and	r4, r4, r0	/* disable data-side IRAM */
+ 	mtdcr	ocmiscntl, r3	/* set instr-side IRAM config */
+ 	mtdcr	ocmdscntl, r4	/* set data-side IRAM config */
+ 	isync
+
+	addis	r3, 0, CFG_OCM_DATA_ADDR@h /* OCM location */
+	mtdcr	ocmdsarc, r3
+	addis	r4, 0, 0xC000		/* OCM data area enabled */
+	mtdcr	ocmdscntl, r4
+ 	isync
+#endif
+
+	/*----------------------------------------------------------------------- */
+	/* Setup temporary stack in DCACHE or OCM if needed for SDRAM SPD. */
+	/*----------------------------------------------------------------------- */
+#ifdef CFG_INIT_DCACHE_CS
+	/*----------------------------------------------------------------------- */
+	/* Memory Bank x (nothingness) initialization 1GB+64MEG */
+	/* used as temporary stack pointer for stage0  */
+	/*----------------------------------------------------------------------- */
+	li	r4,PBxAP
+	mtdcr	ebccfga,r4
+	lis	r4,0x0380
+	ori	r4,r4,0x0480
+	mtdcr	ebccfgd,r4
+
+	addi	r4,0,PBxCR
+	mtdcr	ebccfga,r4
+	lis	r4,0x400D
+	ori	r4,r4,0xa000
+	mtdcr	ebccfgd,r4
+
+	/* turn on data chache for this region */
+	lis	r4,0x0080
+	mtdccr	r4
+
+	/* set stack pointer and clear stack to known value */
+
+	lis	r1,CFG_INIT_RAM_ADDR@h
+	ori     r1,r1,CFG_INIT_SP_OFFSET@l
+
+	li	r4,2048			/* we store 2048 words to stack */
+	mtctr	r4
+
+	lis	r2,CFG_INIT_RAM_ADDR@h		/* we also clear data area */
+	ori	r2,r2,CFG_INIT_RAM_END@l 	/* so cant copy value from r1 */
+
+	lis	r4,0xdead		/* we store 0xdeaddead in the stack */
+	ori	r4,r4,0xdead
+
+..stackloop:
+	stwu	r4,-4(r2)
+	bdnz	..stackloop
+
+	li	r0, 0			/* Make room for stack frame header and */
+	stwu	r0, -4(r1)		/* clear final stack frame so that	*/
+	stwu	r0, -4(r1)		/* stack backtraces terminate cleanly	*/
+	/*
+	 * Set up a dummy frame to store reset vector as return address.
+	 * this causes stack underflow to reset board.
+	 */
+	stwu	r1, -8(r1)		/* Save back chain and move SP */
+	addis	r0, 0, RESET_VECTOR@h	/* Address of reset vector */
+	ori	r0, r0, RESET_VECTOR@l
+	stwu	r1, -8(r1)		/* Save back chain and move SP */
+	stw	r0, +12(r1)		/* Save return addr (underflow vect) */
+
+#elif defined(CFG_TEMP_STACK_OCM) && \
+	(defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE))
+	/*
+	 * Stack in OCM.
+	 */
+
+	/* Set up Stack at top of OCM */
+	lis	r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@h
+	ori	r1, r1, (CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET)@l
+
+	/* Set up a zeroized stack frame so that backtrace works right */
+	li	r0, 0
+	stwu	r0, -4(r1)
+	stwu	r0, -4(r1)
+
+	/*
+	 * Set up a dummy frame to store reset vector as return address.
+	 * this causes stack underflow to reset board.
+	 */
+	stwu	r1, -8(r1)		/* Save back chain and move SP */
+	lis	r0, RESET_VECTOR@h	/* Address of reset vector */
+	ori	r0, r0, RESET_VECTOR@l
+	stwu	r1, -8(r1)		/* Save back chain and move SP */
+	stw	r0, +12(r1)		/* Save return addr (underflow vect) */
+#endif /* CFG_INIT_DCACHE_CS */
+
+	/*----------------------------------------------------------------------- */
+	/* Initialize SDRAM Controller  */
+	/*----------------------------------------------------------------------- */
+	bl	sdram_init
+
+	/*
+	 * Setup temporary stack pointer only for boards
+	 * that do not use SDRAM SPD I2C stuff since it
+	 * is already initialized to use DCACHE or OCM
+	 * stacks.
+	 */
+#if !(defined(CFG_INIT_DCACHE_CS) || defined(CFG_TEMP_STACK_OCM))
+	lis	r1, CFG_INIT_RAM_ADDR@h
+	ori	r1,r1,CFG_INIT_SP_OFFSET /* set up the stack in SDRAM */
+
+	li	r0, 0			/* Make room for stack frame header and */
+	stwu	r0, -4(r1)		/* clear final stack frame so that	*/
+	stwu	r0, -4(r1)		/* stack backtraces terminate cleanly	*/
+	/*
+	 * Set up a dummy frame to store reset vector as return address.
+	 * this causes stack underflow to reset board.
+	 */
+	stwu	r1, -8(r1)		/* Save back chain and move SP */
+	lis	r0, RESET_VECTOR@h	/* Address of reset vector */
+	ori	r0, r0, RESET_VECTOR@l
+	stwu	r1, -8(r1)		/* Save back chain and move SP */
+	stw	r0, +12(r1)		/* Save return addr (underflow vect) */
+#endif /* !(CFG_INIT_DCACHE_CS  || !CFG_TEM_STACK_OCM) */
+
+	GET_GOT			/* initialize GOT access			*/
+
+       	bl	cpu_init_f	/* run low-level CPU init code     (from Flash)	*/
+
+	/* NEVER RETURNS! */
+	bl	board_init_f	/* run first part of init code (from Flash)	*/
+
+#endif	/* CONFIG_405GP || CONFIG_405CR */
+
+
+	.globl	_start_of_vectors
+_start_of_vectors:
+
+#if 0
+/*TODO Fixup _start above so we can do this*/
+/* Critical input. */
+	CRIT_EXCEPTION(0x100, CritcalInput, CritcalInputException)
+#endif
+
+/* Machine check */
+	STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
+
+/* Data Storage exception. */
+	STD_EXCEPTION(0x300, DataStorage, UnknownException)
+
+/* Instruction Storage exception. */
+	STD_EXCEPTION(0x400, InstStorage, UnknownException)
+
+/* External Interrupt exception. */
+	STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt)
+
+/* Alignment exception. */
+	. = 0x600
+Alignment:
+	EXCEPTION_PROLOG
+	mfspr	r4,DAR
+	stw	r4,_DAR(r21)
+	mfspr	r5,DSISR
+	stw	r5,_DSISR(r21)
+	addi	r3,r1,STACK_FRAME_OVERHEAD
+	li	r20,MSR_KERNEL
+	rlwimi	r20,r23,0,16,16		/* copy EE bit from saved MSR */
+	lwz	r6,GOT(transfer_to_handler)
+	mtlr	r6
+	blrl
+.L_Alignment:
+	.long	AlignmentException - _start + EXC_OFF_SYS_RESET
+	.long	int_return - _start + EXC_OFF_SYS_RESET
+
+/* Program check exception */
+	. = 0x700
+ProgramCheck:
+	EXCEPTION_PROLOG
+	addi	r3,r1,STACK_FRAME_OVERHEAD
+	li	r20,MSR_KERNEL
+	rlwimi	r20,r23,0,16,16		/* copy EE bit from saved MSR */
+	lwz	r6,GOT(transfer_to_handler)
+	mtlr	r6
+	blrl
+.L_ProgramCheck:
+	.long	ProgramCheckException - _start + EXC_OFF_SYS_RESET
+	.long	int_return - _start + EXC_OFF_SYS_RESET
+
+	/* No FPU on MPC8xx.  This exception is not supposed to happen.
+	*/
+	STD_EXCEPTION(0x800, FPUnavailable, UnknownException)
+
+	/* I guess we could implement decrementer, and may have
+	 * to someday for timekeeping.
+	 */
+	STD_EXCEPTION(0x900, Decrementer, timer_interrupt)
+	STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
+	STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
+
+	. = 0xc00
+/*
+ * r0 - SYSCALL number
+ * r3-... arguments
+ */
+SystemCall:
+	addis	r11,r0,0		/* get functions table addr */
+	ori	r11,r11,0		/* Note: this code is patched in trap_init */
+	addis	r12,r0,0		/* get number of functions */
+	ori	r12,r12,0
+
+	cmplw	0, r0, r12
+	bge	1f
+
+	rlwinm	r0,r0,2,0,31		/* fn_addr = fn_tbl[r0] */
+	add	r11,r11,r0
+	lwz	r11,0(r11)
+
+	li	r12,0xd00-4*3		/* save LR & SRRx */
+	mflr	r0
+	stw	r0,0(r12)
+	mfspr	r0,SRR0
+	stw	r0,4(r12)
+	mfspr	r0,SRR1
+	stw	r0,8(r12)
+
+	li	r12,0xc00+_back-SystemCall
+	mtlr	r12
+	mtspr	SRR0,r11
+
+1:	SYNC
+	rfi
+
+_back:
+
+	mfmsr	r11			/* Disable interrupts */
+	li	r12,0
+	ori	r12,r12,MSR_EE
+	andc	r11,r11,r12
+	SYNC				/* Some chip revs need this... */
+	mtmsr	r11
+	SYNC
+
+	li	r12,0xd00-4*3		/* restore regs */
+	lwz	r11,0(r12)
+	mtlr	r11
+	lwz	r11,4(r12)
+	mtspr	SRR0,r11
+	lwz	r11,8(r12)
+	mtspr	SRR1,r11
+
+	SYNC
+	rfi
+
+	STD_EXCEPTION(0xd00, SingleStep, UnknownException)
+
+	STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
+	STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
+
+	/* On the MPC8xx, this is a software emulation interrupt.  It occurs
+	 * for all unimplemented and illegal instructions.
+	 */
+	STD_EXCEPTION(0x1000, PIT, PITException)
+
+	STD_EXCEPTION(0x1100, InstructionTLBMiss, UnknownException)
+	STD_EXCEPTION(0x1200, DataTLBMiss, UnknownException)
+	STD_EXCEPTION(0x1300, InstructionTLBError, UnknownException)
+	STD_EXCEPTION(0x1400, DataTLBError, UnknownException)
+
+	STD_EXCEPTION(0x1500, Reserved5, UnknownException)
+	STD_EXCEPTION(0x1600, Reserved6, UnknownException)
+	STD_EXCEPTION(0x1700, Reserved7, UnknownException)
+	STD_EXCEPTION(0x1800, Reserved8, UnknownException)
+	STD_EXCEPTION(0x1900, Reserved9, UnknownException)
+	STD_EXCEPTION(0x1a00, ReservedA, UnknownException)
+	STD_EXCEPTION(0x1b00, ReservedB, UnknownException)
+
+	STD_EXCEPTION(0x1c00, DataBreakpoint, UnknownException)
+	STD_EXCEPTION(0x1d00, InstructionBreakpoint, UnknownException)
+	STD_EXCEPTION(0x1e00, PeripheralBreakpoint, UnknownException)
+	STD_EXCEPTION(0x1f00, DevPortBreakpoint, UnknownException)
+
+	CRIT_EXCEPTION(0x2000, DebugBreakpoint, DebugException )
+
+	.globl	_end_of_vectors
+_end_of_vectors:
+
+
+	. = 0x2100
+
+/*
+ * This code finishes saving the registers to the exception frame
+ * and jumps to the appropriate handler for the exception.
+ * Register r21 is pointer into trap frame, r1 has new stack pointer.
+ */
+	.globl	transfer_to_handler
+transfer_to_handler:
+	stw	r22,_NIP(r21)
+	lis	r22,MSR_POW@h
+	andc	r23,r23,r22
+	stw	r23,_MSR(r21)
+	SAVE_GPR(7, r21)
+	SAVE_4GPRS(8, r21)
+	SAVE_8GPRS(12, r21)
+	SAVE_8GPRS(24, r21)
+#if 0
+	andi.	r23,r23,MSR_PR
+	mfspr	r23,SPRG3		/* if from user, fix up tss.regs */
+	beq	2f
+	addi	r24,r1,STACK_FRAME_OVERHEAD
+	stw	r24,PT_REGS(r23)
+2:	addi	r2,r23,-TSS		/* set r2 to current */
+	tovirt(r2,r2,r23)
+#endif
+	mflr	r23
+	andi.	r24,r23,0x3f00		/* get vector offset */
+	stw	r24,TRAP(r21)
+	li	r22,0
+	stw	r22,RESULT(r21)
+	mtspr	SPRG2,r22		/* r1 is now kernel sp */
+#if 0
+	addi	r24,r2,TASK_STRUCT_SIZE /* check for kernel stack overflow */
+	cmplw	0,r1,r2
+	cmplw	1,r1,r24
+	crand	1,1,4
+	bgt	stack_ovf		/* if r2 < r1 < r2+TASK_STRUCT_SIZE */
+#endif
+	lwz	r24,0(r23)		/* virtual address of handler */
+	lwz	r23,4(r23)		/* where to go when done */
+	mtspr	SRR0,r24
+	mtspr	SRR1,r20
+	mtlr	r23
+	SYNC
+	rfi				/* jump to handler, enable MMU */
+
+int_return:
+	mfmsr	r28		/* Disable interrupts */
+	li	r4,0
+	ori	r4,r4,MSR_EE
+	andc	r28,r28,r4
+	SYNC			/* Some chip revs need this... */
+	mtmsr	r28
+	SYNC
+	lwz	r2,_CTR(r1)
+	lwz	r0,_LINK(r1)
+	mtctr	r2
+	mtlr	r0
+	lwz	r2,_XER(r1)
+	lwz	r0,_CCR(r1)
+	mtspr	XER,r2
+	mtcrf	0xFF,r0
+	REST_10GPRS(3, r1)
+	REST_10GPRS(13, r1)
+	REST_8GPRS(23, r1)
+	REST_GPR(31, r1)
+	lwz	r2,_NIP(r1)	/* Restore environment */
+	lwz	r0,_MSR(r1)
+	mtspr	SRR0,r2
+	mtspr	SRR1,r0
+	lwz	r0,GPR0(r1)
+	lwz	r2,GPR2(r1)
+	lwz	r1,GPR1(r1)
+	SYNC
+	rfi
+
+crit_return:
+	mfmsr	r28		/* Disable interrupts */
+	li	r4,0
+	ori	r4,r4,MSR_EE
+	andc	r28,r28,r4
+	SYNC			/* Some chip revs need this... */
+	mtmsr	r28
+	SYNC
+	lwz	r2,_CTR(r1)
+	lwz	r0,_LINK(r1)
+	mtctr	r2
+	mtlr	r0
+	lwz	r2,_XER(r1)
+	lwz	r0,_CCR(r1)
+	mtspr	XER,r2
+	mtcrf	0xFF,r0
+	REST_10GPRS(3, r1)
+	REST_10GPRS(13, r1)
+	REST_8GPRS(23, r1)
+	REST_GPR(31, r1)
+	lwz	r2,_NIP(r1)	/* Restore environment */
+	lwz	r0,_MSR(r1)
+	mtspr	990,r2		/* SRR2 */
+	mtspr	991,r0		/* SRR3 */
+	lwz	r0,GPR0(r1)
+	lwz	r2,GPR2(r1)
+	lwz	r1,GPR1(r1)
+	SYNC
+	rfci
+
+/* Cache functions.
+*/
+invalidate_icache:
+	iccci	r0,r0			/* for 405, iccci invalidates the */
+	blr				/*   entire I cache */
+
+invalidate_dcache:
+	addi	r6,0,0x0000		/* clear GPR 6 */
+	/* Do loop for # of dcache congruence classes. */
+	addi	r7,r0, (CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)
+					/* NOTE: dccci invalidates both */
+	mtctr	r7			/* ways in the D cache */
+..dcloop:
+	dccci	0,r6			/* invalidate line */
+	addi	r6,r6, CFG_CACHELINE_SIZE /* bump to next line */
+	bdnz	..dcloop
+	blr
+
+flush_dcache:
+	addis	r9,r0,0x0002		/* set mask for EE and CE msr bits */
+	ori	r9,r9,0x8000
+	mfmsr	r12			/* save msr */
+	andc	r9,r12,r9
+	mtmsr	r9			/* disable EE and CE */
+	addi	r10,r0,0x0001		/* enable data cache for unused memory */
+	mfdccr	r9			/* region 0xF8000000-0xFFFFFFFF via */
+	or	r10,r10,r9		/* bit 31 in dccr */
+	mtdccr	r10
+
+	/* do loop for # of congruence classes. */
+	addi	r10,r0,(CFG_DCACHE_SIZE / CFG_CACHELINE_SIZE / 2)
+	addi	r11,r0,(CFG_DCACHE_SIZE / 2) /* D cache set size - 2 way sets */
+	mtctr	r10
+	addi	r10,r0,(0xE000-0x10000)	/* start at 0xFFFFE000 */
+	add	r11,r10,r11		/* add to get to other side of cache line */
+..flush_dcache_loop:
+	lwz	r3,0(r10)		/* least recently used side */
+	lwz	r3,0(r11)		/* the other side */
+	dccci	r0,r11			/* invalidate both sides */
+	addi	r10,r10,CFG_CACHELINE_SIZE /* bump to next line */
+	addi	r11,r11,CFG_CACHELINE_SIZE /* bump to next line */
+	bdnz	..flush_dcache_loop
+	sync				/* allow memory access to complete */
+	mtdccr	r9			/* restore dccr */
+	mtmsr	r12			/* restore msr */
+	blr
+
+	.globl	icache_enable
+icache_enable:
+	mflr	r8
+	bl	invalidate_icache
+	mtlr	r8
+	isync
+	addis	r3,r0, 0x8000	      /* set bit 0 */
+	mticcr	r3
+	blr
+
+	.globl	icache_disable
+icache_disable:
+	addis	r3,r0, 0x0000	      /* clear bit 0 */
+	mticcr	r3
+	isync
+	blr
+
+	.globl	icache_status
+icache_status:
+	mficcr	r3
+	srwi	r3, r3, 31	/* >>31 => select bit 0 */
+	blr
+
+	.globl	dcache_enable
+dcache_enable:
+	mflr	r8
+	bl	invalidate_dcache
+	mtlr	r8
+	isync
+	addis	r3,r0, 0x8000	      /* set bit 0 */
+	mtdccr	r3
+	blr
+
+	.globl	dcache_disable
+dcache_disable:
+	mflr	r8
+	bl	flush_dcache
+	mtlr	r8
+	addis	r3,r0, 0x0000	      /* clear bit 0 */
+	mtdccr	r3
+	blr
+
+	.globl	dcache_status
+dcache_status:
+	mfdccr	r3
+	srwi	r3, r3, 31	/* >>31 => select bit 0 */
+	blr
+
+	.globl get_pvr
+get_pvr:
+	mfspr	r3, PVR
+	blr
+
+#if !defined(CONFIG_440)
+	.globl wr_pit
+wr_pit:
+	mtspr	pit, r3
+	blr
+#endif
+
+	.globl wr_tcr
+wr_tcr:
+	mtspr	tcr, r3
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 in8 */
+/* Description:	 Input 8 bits */
+/*------------------------------------------------------------------------------- */
+	.globl	in8
+in8:
+	lbz	r3,0x0000(r3)
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 out8 */
+/* Description:	 Output 8 bits */
+/*------------------------------------------------------------------------------- */
+	.globl	out8
+out8:
+	stb	r4,0x0000(r3)
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 out16 */
+/* Description:	 Output 16 bits */
+/*------------------------------------------------------------------------------- */
+	.globl	out16
+out16:
+	sth	r4,0x0000(r3)
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 out16r */
+/* Description:	 Byte reverse and output 16 bits */
+/*------------------------------------------------------------------------------- */
+	.globl	out16r
+out16r:
+	sthbrx	r4,r0,r3
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 out32 */
+/* Description:	 Output 32 bits */
+/*------------------------------------------------------------------------------- */
+	.globl	out32
+out32:
+	stw	r4,0x0000(r3)
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 out32r */
+/* Description:	 Byte reverse and output 32 bits */
+/*------------------------------------------------------------------------------- */
+	.globl	out32r
+out32r:
+	stwbrx	r4,r0,r3
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 in16 */
+/* Description:	 Input 16 bits */
+/*------------------------------------------------------------------------------- */
+	.globl	in16
+in16:
+	lhz	r3,0x0000(r3)
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 in16r */
+/* Description:	 Input 16 bits and byte reverse */
+/*------------------------------------------------------------------------------- */
+	.globl	in16r
+in16r:
+	lhbrx	r3,r0,r3
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 in32 */
+/* Description:	 Input 32 bits */
+/*------------------------------------------------------------------------------- */
+	.globl	in32
+in32:
+	lwz	3,0x0000(3)
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 in32r */
+/* Description:	 Input 32 bits and byte reverse */
+/*------------------------------------------------------------------------------- */
+	.globl	in32r
+in32r:
+	lwbrx	r3,r0,r3
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 ppcDcbf */
+/* Description:	 Data Cache block flush */
+/* Input:	 r3 = effective address */
+/* Output:	 none. */
+/*------------------------------------------------------------------------------- */
+	.globl	ppcDcbf
+ppcDcbf:
+	dcbf	r0,r3
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 ppcDcbi */
+/* Description:	 Data Cache block Invalidate */
+/* Input:	 r3 = effective address */
+/* Output:	 none. */
+/*------------------------------------------------------------------------------- */
+	.globl	ppcDcbi
+ppcDcbi:
+	dcbi	r0,r3
+	blr
+
+/*------------------------------------------------------------------------------- */
+/* Function:	 ppcSync */
+/* Description:	 Processor Synchronize */
+/* Input:	 none. */
+/* Output:	 none. */
+/*------------------------------------------------------------------------------- */
+	.globl	ppcSync
+ppcSync:
+	sync
+	blr
+
+/*------------------------------------------------------------------------------*/
+
+/*
+ * void relocate_code (addr_sp, gd, addr_moni)
+ *
+ * This "function" does not return, instead it continues in RAM
+ * after relocating the monitor code.
+ *
+ * r3 = dest
+ * r4 = src
+ * r5 = length in bytes
+ * r6 = cachelinesize
+ */
+	.globl	relocate_code
+relocate_code:
+	mr	r1,  r3		/* Set new stack pointer		*/
+	mr	r9,  r4		/* Save copy of Init Data pointer	*/
+	mr	r10, r5		/* Save copy of Destination Address	*/
+
+	mr	r3,  r5				/* Destination Address	*/
+	lis	r4, CFG_MONITOR_BASE@h		/* Source      Address	*/
+	ori	r4, r4, CFG_MONITOR_BASE@l
+	lis	r5, CFG_MONITOR_LEN@h		/* Length in Bytes	*/
+	ori	r5, r5, CFG_MONITOR_LEN@l
+	li	r6, CFG_CACHELINE_SIZE		/* Cache Line Size	*/
+
+	/*
+	 * Fix GOT pointer:
+	 *
+	 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
+	 *
+	 * Offset:
+	 */
+	sub	r15, r10, r4
+
+	/* First our own GOT */
+	add	r14, r14, r15
+	/* the the one used by the C code */
+	add	r30, r30, r15
+
+	/*
+	 * Now relocate code
+	 */
+
+	cmplw	cr1,r3,r4
+	addi	r0,r5,3
+	srwi.	r0,r0,2
+	beq	cr1,4f		/* In place copy is not necessary	*/
+	beq	7f		/* Protect against 0 count		*/
+	mtctr	r0
+	bge	cr1,2f
+
+	la	r8,-4(r4)
+	la	r7,-4(r3)
+1:	lwzu	r0,4(r8)
+	stwu	r0,4(r7)
+	bdnz	1b
+	b	4f
+
+2:	slwi	r0,r0,2
+	add	r8,r4,r0
+	add	r7,r3,r0
+3:	lwzu	r0,-4(r8)
+	stwu	r0,-4(r7)
+	bdnz	3b
+
+/*
+ * Now flush the cache: note that we must start from a cache aligned
+ * address. Otherwise we might miss one cache line.
+ */
+4:	cmpwi	r6,0
+	add	r5,r3,r5
+	beq	7f		/* Always flush prefetch queue in any case */
+	subi	r0,r6,1
+	andc	r3,r3,r0
+	mr	r4,r3
+5:	dcbst	0,r4
+	add	r4,r4,r6
+	cmplw	r4,r5
+	blt	5b
+	sync			/* Wait for all dcbst to complete on bus */
+	mr	r4,r3
+6:	icbi	0,r4
+	add	r4,r4,r6
+	cmplw	r4,r5
+	blt	6b
+7:	sync			/* Wait for all icbi to complete on bus */
+	isync
+
+/*
+ * We are done. Do not return, instead branch to second part of board
+ * initialization, now running from RAM.
+ */
+
+	addi	r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
+	mtlr	r0
+	blr				/* NEVER RETURNS! */
+
+in_ram:
+
+	/*
+	 * Relocation Function, r14 point to got2+0x8000
+	 *
+	 * Adjust got2 pointers, no need to check for 0, this code
+	 * already puts a few entries in the table.
+	 */
+	li	r0,__got2_entries@sectoff@l
+	la	r3,GOT(_GOT2_TABLE_)
+	lwz	r11,GOT(_GOT2_TABLE_)
+	mtctr	r0
+	sub	r11,r3,r11
+	addi	r3,r3,-4
+1:	lwzu	r0,4(r3)
+	add	r0,r0,r11
+	stw	r0,0(r3)
+	bdnz	1b
+
+	/*
+	 * Now adjust the fixups and the pointers to the fixups
+	 * in case we need to move ourselves again.
+	 */
+2:	li	r0,__fixup_entries@sectoff@l
+	lwz	r3,GOT(_FIXUP_TABLE_)
+	cmpwi	r0,0
+	mtctr	r0
+	addi	r3,r3,-4
+	beq	4f
+3:	lwzu	r4,4(r3)
+	lwzux	r0,r4,r11
+	add	r0,r0,r11
+	stw	r10,0(r3)
+	stw	r0,0(r4)
+	bdnz	3b
+4:
+clear_bss:
+	/*
+	 * Now clear BSS segment
+	 */
+	lwz	r3,GOT(.bss)
+	lwz	r4,GOT(_end)
+
+	cmplw	0, r3, r4
+	beq	6f
+
+	li	r0, 0
+5:
+	stw	r0, 0(r3)
+	addi	r3, r3, 4
+	cmplw	0, r3, r4
+	bne	5b
+6:
+
+	mr	r3, r9		/* Init Data pointer		*/
+	mr	r4, r10		/* Destination Address		*/
+	bl	board_init_r
+
+	/* Problems accessing "end" in C, so do it here */
+	.globl	get_endaddr
+get_endaddr:
+	lwz	r3,GOT(_end)
+	blr
+
+	/*
+	 * Copy exception vector code to low memory
+	 *
+	 * r3: dest_addr
+	 * r7: source address, r8: end address, r9: target address
+	 */
+	.globl	trap_init
+trap_init:
+	lwz	r7, GOT(_start)
+	lwz	r8, GOT(_end_of_vectors)
+
+	rlwinm	r9, r7, 0, 18, 31	/* _start & 0x3FFF	*/
+
+	cmplw	0, r7, r8
+	bgelr				/* return if r7>=r8 - just in case */
+
+	mflr	r4			/* save link register		*/
+1:
+	lwz	r0, 0(r7)
+	stw	r0, 0(r9)
+	addi	r7, r7, 4
+	addi	r9, r9, 4
+	cmplw	0, r7, r8
+	bne	1b
+
+	/*
+	 * relocate `hdlr' and `int_return' entries
+	 */
+	li	r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
+	li	r8, Alignment - _start + EXC_OFF_SYS_RESET
+2:
+	bl	trap_reloc
+	addi	r7, r7, 0x100		/* next exception vector	*/
+	cmplw	0, r7, r8
+	blt	2b
+
+	li	r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
+	bl	trap_reloc
+
+	li	r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
+	bl	trap_reloc
+
+	li	r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
+	li	r8, SystemCall - _start + EXC_OFF_SYS_RESET
+3:
+	bl	trap_reloc
+	addi	r7, r7, 0x100		/* next exception vector	*/
+	cmplw	0, r7, r8
+	blt	3b
+
+	li	r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET
+	li	r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
+4:
+	bl	trap_reloc
+	addi	r7, r7, 0x100		/* next exception vector	*/
+	cmplw	0, r7, r8
+	blt	4b
+
+	mtlr	r4			/* restore link register	*/
+	blr
+
+	/*
+	 * Function: relocate entries for one exception vector
+	 */
+trap_reloc:
+	lwz	r0, 0(r7)		/* hdlr ...			*/
+	add	r0, r0, r3		/*  ... += dest_addr		*/
+	stw	r0, 0(r7)
+
+	lwz	r0, 4(r7)		/* int_return ...		*/
+	add	r0, r0, r3		/*  ... += dest_addr		*/
+	stw	r0, 4(r7)
+
+	blr