* Patches by Xianghua Xiao, 15 Oct 2003:

  - Added Motorola CPU 8540/8560 support (cpu/85xx)
  - Added Motorola MPC8540ADS board support (board/mpc8540ads)
  - Added Motorola MPC8560ADS board support (board/mpc8560ads)

* Minor code cleanup

1 files changed, 1156 insertions, 0 deletions

diff --git a/cpu/mpc85xx/start.S b/cpu/mpc85xx/start.S
new file mode 100644
index 0000000000..468923c998
--- /dev/null
+++ b/cpu/mpc85xx/start.S
@@ -0,0 +1,1156 @@
+/*
+ * Copyright (C) 2003  Motorola,Inc.
+ * Xianghua Xiao<X.Xiao@motorola.com>
+ *
+ * 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
+ */
+
+/* U-Boot Startup Code for Motorola 85xx PowerPC based Embedded Boards
+ *
+ * The processor starts at 0xfffffffc and the code is first executed in the
+ * last 4K page(0xfffff000-0xffffffff) in flash/rom.
+ *
+ */
+
+#include <config.h>
+#include <mpc85xx.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
+
+#undef	MSR_KERNEL
+#define MSR_KERNEL ( MSR_ME  )	/* Machine Check */
+
+/*
+ * 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(__init_end)
+	GOT_ENTRY(_end)
+	GOT_ENTRY(__bss_start)
+	END_GOT
+
+/*
+ * e500 Startup -- after reset only the last 4KB of the effective
+ * address space is mapped in the MMU L2 TLB1 Entry0. The .bootpg
+ * section is located at THIS LAST page and basically does three
+ * things: clear some registers, set up exception tables and
+ * add more TLB entries for 'larger spaces'(e.g. the boot rom) to
+ * continue the boot procedure.
+
+ * Once the boot rom is mapped by TLB entries we can proceed
+ * with normal startup.
+ *
+ */
+
+    .section .bootpg,"ax"
+    .globl _start_e500
+
+_start_e500:
+#if defined(CONFIG_MPC85xx_REV1)
+	li	r0,0x2000
+	mtspr	977,r0
+#endif
+
+	/* Clear and set up some registers. Note: Some registers need strict
+	 * synchronization by sync/mbar/msync/isync when being "mtspr".
+	 * BookE: isync before PID,tlbivax,tlbwe
+	 * BookE: isync after MSR,PID; msync_isync after tlbivax & tlbwe
+	 * E500:  msync,isync before L1CSR0
+	 * E500:  isync after BBEAR,BBTAR,BUCSR,DBCR0,DBCR1,HID0,HID1,L1CSR0
+	 *        L1CSR1, MAS[0,1,2,3,4,6],MMUCSR0, PID[0,1,2],SPEFCSR
+	 */
+
+	/* invalidate d-cache */
+	mfspr	r0,L1CSR0
+	ori	r0,r0,0x0002
+	msync
+	isync
+	mtspr	L1CSR0,r0
+	isync
+
+	/* disable d-cache */
+	li	r0,0x0
+	mtspr	L1CSR0,r0
+	isync
+
+	/* invalidate i-cache */
+	mfspr	r0,L1CSR1
+	ori	r0,r0,0x0002
+	mtspr	L1CSR1,r0
+	isync
+
+	/* disable i-cache */
+	li	r0,0x0
+	mtspr	L1CSR1,r0
+	isync
+
+	/* clear registers */
+	sync
+	li	r0,0
+	mtspr	SRR0,r0
+	mtspr	SRR1,r0
+	mtspr	CSRR0,r0
+	mtspr	CSRR1,r0
+	mtspr	MCSRR0,r0
+	mtspr	MCSRR1,r0
+
+	mtspr	ESR,r0
+	mtspr	MCSR,r0
+	mtspr	DEAR,r0
+
+	mtspr	DBCR0,r0
+	isync
+	mtspr	DBCR1,r0
+	isync
+	mtspr	DBCR2,r0
+	isync
+	mtspr	IAC1,r0
+	mtspr	IAC2,r0
+	mtspr	DAC1,r0
+	mtspr	DAC2,r0
+
+	mfspr	r1,DBSR
+	mtspr	DBSR,r1		/* Clear all valid bits */
+
+	isync
+	mtspr	PID0,r0
+	isync
+	mtspr	PID1,r0
+	isync
+	mtspr	PID2,r0
+	isync
+
+	mtspr	TCR,r0
+
+	mtspr	BUCSR,r0	/* disable branch prediction */
+	isync
+
+	mtspr	HID0,r0
+	isync
+	mtspr	HID1,r0
+	isync
+
+	mtspr   MAS4,r0
+	isync
+	mtspr   MAS6,r0
+	isync
+
+	/* Setup interrupt vectors */
+	mtspr IVPR, r0
+
+	li      r1,0x0100
+	mtspr	IVOR0,r1	/* 0: Critical input */
+	li      r1,0x0200
+	mtspr	IVOR1,r1	/* 1: Machine check */
+	li      r1,0x0300
+	mtspr	IVOR2,r1	/* 2: Data storage */
+	li      r1,0x0400
+	mtspr	IVOR3,r1	/* 3: Instruction storage */
+	li	r1,0x0500
+	mtspr	IVOR4,r1	/* 4: External interrupt */
+	li	r1,0x0600
+	mtspr	IVOR5,r1	/* 5: Alignment */
+	li	r1,0x0700
+	mtspr	IVOR6,r1	/* 6: Program check */
+	li	r1,0x0800
+	mtspr	IVOR7,r1	/* 7: floating point unavailable */
+	li	r1,0x0c00
+	mtspr	IVOR8,r1	/* 8: System call */
+	/* 9: Auxiliary processor unavailable(unsupported) */
+	li	r1,0x1000
+	mtspr	IVOR10,r1	/* 10: Decrementer */
+	li	r1,0x1400
+	mtspr	IVOR13,r1	/* 13: Data TLB error */
+	li	r1,0x1300
+	mtspr	IVOR14,r1	/* 14: Instruction TLB error */
+	li	r1,0x2000
+	mtspr	IVOR15,r1	/* 15: Debug */
+
+	/* invalidate MMU L1/L2 */
+	/* Note: before invalidate MMU L1/L2, we read TLB1 Entry 0 and then
+	 * write it back immediately to fixup a bug(Errata CPU4)  for this initial
+	 * TLB1 entry 0,otherwise the TLB1 entry 0 will be invalidated.
+	 */
+#if defined(CONFIG_MPC85xx_REV1)
+	lis	r2,0x1000
+	mtspr	MAS0,r2
+	tlbre
+	tlbwe
+	isync
+	li      r2, 0x001e
+	mtspr   MMUCSR0, r2
+	isync
+#endif
+
+	/* After reset, CCSRBAR is located at CFG_CCSRBAR_DEFAULT, i.e.
+	 * 0xff700000-0xff800000. We need add a TLB1 entry for this 1MB
+	 * region before we can access any CCSR registers such as L2
+	 * registers, Local Access Registers,etc. We will also re-allocate
+	 * CFG_CCSRBAR_DEFAULT to CFG_CCSRBAR immediately after TLB1 setup.
+	 *
+	 * Please refer to board-specif directory for TLB1 entry configuration.
+	 * (e.g. board/<yourboard>/init.S)
+	 *
+	 */
+	bl 	tlb1_entry
+	mr	r5,r0
+	li	r1,0x000f	/* max 16 TLB1 entries */
+	mtctr	r1
+	lwzu	r4,0(r5)	/* how many TLB1 entries we actually use */
+
+0:	cmpwi	r4,0
+	beq	1f
+	lwzu	r0,4(r5)
+	lwzu	r1,4(r5)
+	lwzu	r2,4(r5)
+	lwzu	r3,4(r5)
+	mtspr	MAS0,r0
+	mtspr	MAS1,r1
+	mtspr	MAS2,r2
+	mtspr	MAS3,r3
+	isync
+	msync
+	tlbwe
+	isync
+	addi	r4,r4,-1
+	bdnz	0b
+
+1:
+#if (CFG_CCSRBAR_DEFAULT != CFG_CCSRBAR)
+	/* Special sequence needed to update CCSRBAR itself */
+	lis	r4, CFG_CCSRBAR_DEFAULT@h
+	ori	r4, r4, CFG_CCSRBAR_DEFAULT@l
+
+	lis   	r5, CFG_CCSRBAR@h
+	ori   	r5, r5, CFG_CCSRBAR@l
+	srwi	r6,r5,12
+	stw	r6, 0(r4)
+	isync
+
+	lis	r5, 0xffff
+	ori	r5,r5,0xf000
+	lwz	r5, 0(r5)
+	isync
+
+	lis	r3, CFG_CCSRBAR@h
+	lwz	r5, CFG_CCSRBAR@l(r3)
+	isync
+#endif
+
+	/*  invalidate all TLB0 entries */
+	li 	r3,4
+	li	r4,0
+	tlbivax	r4,r3
+#if defined(CONFIG_MPC85xx_REV1) /* Errata CPU6 */
+	nop
+#endif
+
+	/* set up local access windows, defined at board/<boardname>/init.S */
+	lis	r7,CFG_CCSRBAR@h
+	ori	r7,r7,CFG_CCSRBAR@l
+
+	bl 	law_entry
+	mr	r6,r0
+#if  defined(CONFIG_RAM_AS_FLASH)
+	li	r1,0x0006
+#else
+	li	r1,0x0007	/*we have 8 LAWs, but reseve one for boot-over-rio-or-pci */
+#endif
+	mtctr	r1
+	lwzu	r5,0(r6)	/* how many windows we actually use */
+
+#if defined(CONFIG_RAM_AS_FLASH)
+	li 	r2,0x0c48
+	li	r1,0x0c50
+#else
+	li	r2,0x0c28	/* the first pair is reserved for boot-over-rio-or-pci */
+	li	r1,0x0c30
+#endif
+
+0:	cmpwi	r5,0
+	beq	1f
+	lwzu	r4,4(r6)
+	lwzu	r3,4(r6)
+	stwx	r4,r7,r2
+	stwx	r3,r7,r1
+	addi	r5,r5,-1
+	addi	r2,r2,0x0020
+	addi	r1,r1,0x0020
+	bdnz	0b
+
+	/* Jump out the last 4K page and continue to 'normal' start */
+1:	bl	3f
+	b	_start
+
+3:	li	r0,0
+	mtspr	SRR1,r0		/* Keep things disabled for now */
+	mflr	r1
+	mtspr	SRR0,r1
+	rfi
+
+/*
+ * 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"
+
+	. = EXC_OFF_SYS_RESET
+	.globl	_start
+_start:
+	/* Clear and set up some registers. */
+	li	r0,0x0000
+	lis	r1,0xffff
+	mtspr	DEC,r0			/* prevent dec exceptions */
+	mttbl	r0			/* prevent fit & wdt exceptions */
+	mttbu	r0
+	mtspr	TSR,r1			/* clear all timer exception status */
+	mtspr	TCR,r0			/* disable all */
+	mtspr	ESR,r0			/* clear exception syndrome register */
+	mtspr	MCSR,r0			/* machine check syndrome register */
+	mtxer	r0			/* clear integer exception register */
+	lis	r1,0x0002		/* set CE bit (Critical Exceptions) */
+	ori	r1,r1,0x1200		/* set ME/DE bit */
+	mtmsr	r1			/* change MSR */
+	isync
+
+	/* Enable Time Base and Select Time Base Clock */
+	li	r0,0x4000		/* time base is processor clock */
+	mtspr	HID0,r0
+	isync
+
+#if defined(CONFIG_ADDR_STREAMING)
+	li	r0,0x2000
+	mtspr	HID1,r0
+	isync
+#endif
+
+	/* Enable Branch Prediction */
+#if defined(CONFIG_BTB)
+	li	r0,0x201		/* BBFI = 1, BPEN = 1 */
+	mtspr	BUCSR,r0
+	isync
+#endif
+
+#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	/* DBCR0[IDM] must be set */
+	ori	r0,r0,CFG_INIT_DBCR@l
+	mtspr	dbcr0,r0
+	isync
+#endif
+
+/* L1 DCache is used for initial RAM */
+	mfspr	r2, L1CSR0
+	ori    	r2, r2, 0x0003
+	oris   	r2, r2, 0x0001
+	msync
+	isync
+	mtspr  	L1CSR0, r2	/* enable/invalidate L1 Dcache */
+	isync
+
+	/* Allocate Initial RAM in data cache.
+	 */
+	lis     r3, CFG_INIT_RAM_ADDR@h
+	ori     r3, r3, CFG_INIT_RAM_ADDR@l
+	li      r2, 512 /* 512*32=16K */
+	mtctr   r2
+	li	r0, 0
+1:
+	dcbz	r0, r3
+	dcbtls  0,r0, r3
+	addi    r3, r3, 32
+	bdnz    1b
+
+#ifndef CFG_RAMBOOT
+	/* Calculate absolute address in FLASH and jump there           */
+	/*--------------------------------------------------------------*/
+	lis     r3, CFG_MONITOR_BASE@h
+	ori     r3, r3, CFG_MONITOR_BASE@l
+	addi    r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
+	mtlr    r3
+	blr
+
+in_flash:
+#endif  /* CFG_RAMBOOT */
+
+	/* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache*/
+	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	cpu_init_f
+	bl	icache_enable
+	bl	board_init_f
+	sync
+
+
+/* --FIXME-- machine check with MCSRRn and rfmci */
+
+	.globl	_start_of_vectors
+_start_of_vectors:
+#if 0
+/* Critical input. */
+	CRIT_EXCEPTION(0x0100, CritcalInput, CritcalInputException)
+#endif
+/* Machine check --FIXME-- Should be MACH_EXCEPTION */
+	CRIT_EXCEPTION(0x0200, MachineCheck, MachineCheckException)
+
+/* Data Storage exception. */
+	STD_EXCEPTION(0x0300, DataStorage, UnknownException)
+
+/* Instruction Storage exception. */
+	STD_EXCEPTION(0x0400, InstStorage, UnknownException)
+
+/* External Interrupt exception. */
+	STD_EXCEPTION(0x0500, ExtInterrupt, UnknownException)
+
+/* Alignment exception. */
+	. = 0x0600
+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 */
+	. = 0x0700
+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 MPC85xx.  This exception is not supposed to happen.
+	*/
+	STD_EXCEPTION(0x0800, FPUnavailable, UnknownException)
+	STD_EXCEPTION(0x0900, Decrementer, timer_interrupt)
+	STD_EXCEPTION(0x0a00, Trap_0a, UnknownException)
+	STD_EXCEPTION(0x0b00, Trap_0b, UnknownException)
+
+	. = 0x0c00
+/*
+ * 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      r20,0xd00-4             /* Get stack pointer */
+	lwz     r12,0(r20)
+	subi    r12,r12,12              /* Adjust stack pointer */
+	li      r0,0xc00+_end_back-SystemCall
+	cmplw   0, r0, r12              /* Check stack overflow */
+	bgt     1f
+	stw     r12,0(r20)
+
+	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             /* restore regs */
+	lwz     r12,0(r12)
+
+	lwz     r11,0(r12)
+	mtlr    r11
+	lwz     r11,4(r12)
+	mtspr   SRR0,r11
+	lwz     r11,8(r12)
+	mtspr   SRR1,r11
+
+	addi    r12,r12,12              /* Adjust stack pointer */
+	li      r20,0xd00-4
+	stw     r12,0(r20)
+
+	SYNC
+	rfi
+_end_back:
+
+	STD_EXCEPTION(0xd00, SingleStep, UnknownException)
+
+	STD_EXCEPTION(0xe00, Trap_0e, UnknownException)
+	STD_EXCEPTION(0xf00, Trap_0f, UnknownException)
+
+	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)
+
+	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 */
+
+	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:
+	mfspr	r0,L1CSR1
+	ori	r0,r0,0x0002
+	mtspr	L1CSR1,r0
+	isync
+	blr				/*   entire I cache */
+
+invalidate_dcache:
+	mfspr	r0,L1CSR0
+	ori	r0,r0,0x0002
+	msync
+	isync
+	mtspr	L1CSR0,r0
+	isync
+	blr
+
+	.globl	icache_enable
+icache_enable:
+	mflr	r8
+	bl	invalidate_icache
+	mtlr	r8
+	isync
+	mfspr	r4,L1CSR1
+	ori	r4,r4,0x0001
+	oris	r4,r4,0x0001
+	mtspr	L1CSR1,r4
+	isync
+	blr
+
+	.globl	icache_disable
+icache_disable:
+	mfspr	r0,L1CSR1
+	lis	r1,0xfffffffe@h
+	ori	r1,r1,0xfffffffe@l
+	and	r0,r0,r1
+	mtspr	L1CSR1,r0
+	isync
+	blr
+
+	.globl	icache_status
+icache_status:
+	mfspr	r3,L1CSR1
+	srwi	r3, r3, 31	/* >>31 => select bit 0 */
+	blr
+
+	.globl	dcache_enable
+dcache_enable:
+	mflr	r8
+	bl	invalidate_dcache
+	mtlr	r8
+	isync
+	mfspr	r0,L1CSR0
+	ori	r0,r0,0x0001
+	oris	r0,r0,0x0001
+	msync
+	isync
+	mtspr	L1CSR0,r0
+	isync
+	blr
+
+	.globl	dcache_disable
+dcache_disable:
+	mfspr	r0,L1CSR0
+	lis	r1,0xfffffffe@h
+	ori	r1,r1,0xfffffffe@l
+	and	r0,r0,r1
+	msync
+	isync
+	mtspr	L1CSR0,r0
+	isync
+	blr
+
+	.globl	dcache_status
+dcache_status:
+	mfspr	r3,L1CSR0
+	srwi	r3, r3, 31	/* >>31 => select bit 0 */
+	blr
+
+	.globl get_pir
+get_pir:
+	mfspr	r3, PIR
+	blr
+
+	.globl get_pvr
+get_pvr:
+	mfspr	r3, PVR
+	blr
+
+	.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
+	lwz	r5,GOT(__init_end)
+	sub	r5,r5,r4
+	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_start)
+	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
+
+	/*
+	 * 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)
+
+	li	r9, 0x100		/* reset vector always at 0x100 */
+
+	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
+
+#ifdef CFG_INIT_RAM_LOCK
+.globl unlock_ram_in_cache
+unlock_ram_in_cache:
+	/* invalidate the INIT_RAM section */
+	lis	r3, (CFG_INIT_RAM_ADDR & ~31)@h
+	ori	r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l
+	li	r2,512
+	mtctr	r2
+1:	icbi	r0, r3
+	dcbi	r0, r3
+	addi	r3, r3, 32
+	bdnz	1b
+	sync			/* Wait for all icbi to complete on bus	*/
+	isync
+	blr
+#endif