Initial revision

2 files changed, 1952 insertions, 0 deletions

diff --git a/cpu/74xx_7xx/start.S b/cpu/74xx_7xx/start.S
new file mode 100644
index 0000000000..fe08f8e837
--- /dev/null
+++ b/cpu/74xx_7xx/start.S
@@ -0,0 +1,860 @@
+/*
+ *  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>
+ *  Copyright (C) 2001  Josh Huber <huber@mclx.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 PowerPC based Embedded Boards
+ *
+ *
+ *  The processor starts at 0xfff00100 and the code is executed
+ *  from flash. The code is organized to be at an other address
+ *  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.
+ */
+#include <config.h>
+#include <74xx_7xx.h>
+#include <version.h>
+
+#include <ppc_asm.tmpl>
+#include <ppc_defs.h>
+
+#include <asm/cache.h>
+#include <asm/mmu.h>
+
+#include <galileo/gt64260R.h>
+
+#ifndef  CONFIG_IDENT_STRING
+#define  CONFIG_IDENT_STRING ""
+#endif
+
+/* We don't want the  MMU yet.
+*/
+#undef	MSR_KERNEL
+/* Machine Check and Recoverable Interr. */
+#define MSR_KERNEL ( MSR_ME | MSR_RI )
+
+/*
+ * 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
+
+/*
+ * 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:
+	li	r21, BOOTFLAG_COLD	/* Normal Power-On: Boot from FLASH */
+	b	boot_cold
+	sync
+
+	. = EXC_OFF_SYS_RESET + 0x10
+
+	.globl	_start_warm
+_start_warm:
+	li	r21, BOOTFLAG_WARM	/* Software reboot		*/
+	b	boot_warm
+	sync
+
+	/* the boot code is located below the exception table */
+
+	.globl	_start_of_vectors
+_start_of_vectors:
+
+/* Machine check */
+	STD_EXCEPTION(0x200, MachineCheck, MachineCheckException)
+
+/* Data Storage exception.  "Never" generated on the 860. */
+	STD_EXCEPTION(0x300, DataStorage, UnknownException)
+
+/* Instruction Storage exception.  "Never" generated on the 860. */
+	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, SoftEmu, SoftEmuException)
+
+	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)
+
+	.globl	_end_of_vectors
+_end_of_vectors:
+
+	. = 0x2000
+
+boot_cold:
+boot_warm:
+	/* disable everything */
+	li	r0, 0
+	mtspr	HID0, r0
+	sync
+	mtmsr	0
+	bl	invalidate_bats
+	sync
+
+#ifdef CFG_L2
+	/* init the L2 cache */
+	addis	r3, r0, L2_INIT@h
+	ori	r3, r3, L2_INIT@l
+	sync
+	mtspr	l2cr, r3
+#endif
+#if defined(CONFIG_ALTIVEC) && defined(CONFIG_74xx)
+	.long	0x7e00066c
+		/*
+                 * dssall instruction, gas doesn't have it yet
+                 * ...for altivec, data stream stop all this probably
+                 * isn't needed unless we warm (software) reboot U-Boot
+		 */
+#endif
+
+#ifdef CFG_L2
+	/* invalidate the L2 cache */
+	bl	l2cache_invalidate
+	sync
+#endif
+#ifdef CFG_BOARD_ASM_INIT
+	/* do early init */
+	bl	board_asm_init
+#endif
+
+	/*
+	 * 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:
+	/* let the C-code set up the rest			*/
+	/*							*/
+	/* Be careful to keep code relocatable !		*/
+	/*------------------------------------------------------*/
+
+	/* perform low-level init */
+	/* sdram init, galileo init, etc */
+	/* r3:	NHR bit from HID0 */
+
+	/* setup the bats */
+	bl	setup_bats
+	sync
+
+	/*
+	 * Cache must be enabled here for stack-in-cache trick.
+	 * This means we need to enable the BATS.
+	 * This means:
+         *   1) for the EVB, original gt regs need to be mapped
+	 *   2) need to have an IBAT for the 0xf region,
+	 *      we are running there!
+         * Cache should be turned on after BATs, since by default
+         * everything is write-through.
+         * The init-mem BAT can be reused after reloc. The old
+         * gt-regs BAT can be reused after board_init_f calls
+         * board_pre_init (EVB only).
+         */
+#if !defined(CONFIG_BAB7xx) && !defined(CONFIG_ELPPC)
+	/* enable address translation */
+	bl	enable_addr_trans
+	sync
+
+	/* enable and invalidate the data cache */
+	bl	l1dcache_enable
+	sync
+#endif
+#ifdef CFG_INIT_RAM_LOCK
+	bl	lock_ram_in_cache
+	sync
+#endif
+
+	/* set up the stack pointer in our newly created
+	 * cache-ram (r1) */
+	lis	r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@h
+	ori	r1, r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@l
+
+	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	*/
+
+	/* run low-level CPU init code     (from Flash)	*/
+	bl	cpu_init_f
+	sync
+
+	mr	r3, r21
+
+	/* r3: BOOTFLAG */
+	/* run 1st part of board init code (from Flash)   */
+	bl	board_init_f
+	sync
+
+	/* NOTREACHED */
+
+	.globl	invalidate_bats
+invalidate_bats:
+	/* invalidate BATs */
+	mtspr	IBAT0U, r0
+	mtspr	IBAT1U, r0
+	mtspr	IBAT2U, r0
+	mtspr	IBAT3U, r0
+	isync
+	mtspr	DBAT0U, r0
+	mtspr	DBAT1U, r0
+	mtspr	DBAT2U, r0
+	mtspr	DBAT3U, r0
+	isync
+	sync
+	blr
+
+	/* setup_bats - set them up to some initial state */
+	.globl	setup_bats
+setup_bats:
+	addis	r0, r0, 0x0000
+
+	/* IBAT 0 */
+	addis	r4, r0, CFG_IBAT0L@h
+	ori	r4, r4, CFG_IBAT0L@l
+	addis	r3, r0, CFG_IBAT0U@h
+	ori	r3, r3, CFG_IBAT0U@l
+	mtspr	IBAT0L, r4
+	mtspr	IBAT0U, r3
+	isync
+
+	/* DBAT 0 */
+	addis	r4, r0, CFG_DBAT0L@h
+	ori	r4, r4, CFG_DBAT0L@l
+	addis	r3, r0, CFG_DBAT0U@h
+	ori	r3, r3, CFG_DBAT0U@l
+	mtspr	DBAT0L, r4
+	mtspr	DBAT0U, r3
+	isync
+
+	/* IBAT 1 */
+	addis	r4, r0, CFG_IBAT1L@h
+	ori	r4, r4, CFG_IBAT1L@l
+	addis	r3, r0, CFG_IBAT1U@h
+	ori	r3, r3, CFG_IBAT1U@l
+	mtspr	IBAT1L, r4
+	mtspr	IBAT1U, r3
+	isync
+
+	/* DBAT 1 */
+	addis	r4, r0, CFG_DBAT1L@h
+	ori	r4, r4, CFG_DBAT1L@l
+	addis	r3, r0, CFG_DBAT1U@h
+	ori	r3, r3, CFG_DBAT1U@l
+	mtspr	DBAT1L, r4
+	mtspr	DBAT1U, r3
+	isync
+
+	/* IBAT 2 */
+	addis	r4, r0, CFG_IBAT2L@h
+	ori	r4, r4, CFG_IBAT2L@l
+	addis	r3, r0, CFG_IBAT2U@h
+	ori	r3, r3, CFG_IBAT2U@l
+	mtspr	IBAT2L, r4
+	mtspr	IBAT2U, r3
+	isync
+
+	/* DBAT 2 */
+	addis	r4, r0, CFG_DBAT2L@h
+	ori	r4, r4, CFG_DBAT2L@l
+	addis	r3, r0, CFG_DBAT2U@h
+	ori	r3, r3, CFG_DBAT2U@l
+	mtspr	DBAT2L, r4
+	mtspr	DBAT2U, r3
+	isync
+
+	/* IBAT 3 */
+	addis	r4, r0, CFG_IBAT3L@h
+	ori	r4, r4, CFG_IBAT3L@l
+	addis	r3, r0, CFG_IBAT3U@h
+	ori	r3, r3, CFG_IBAT3U@l
+	mtspr	IBAT3L, r4
+	mtspr	IBAT3U, r3
+	isync
+
+	/* DBAT 3 */
+	addis	r4, r0, CFG_DBAT3L@h
+	ori	r4, r4, CFG_DBAT3L@l
+	addis	r3, r0, CFG_DBAT3U@h
+	ori	r3, r3, CFG_DBAT3U@l
+	mtspr	DBAT3L, r4
+	mtspr	DBAT3U, r3
+	isync
+
+	/* bats are done, now invalidate the TLBs */
+
+	addis	r3, 0, 0x0000
+	addis	r5, 0, 0x4    /* upper bound of 0x00040000 for 7400/750 */
+
+	isync
+
+tlblp:
+	tlbie	r3
+	sync
+	addi	r3, r3, 0x1000
+	cmp	0, 0, r3, r5
+	blt tlblp
+
+	blr
+
+	.globl enable_addr_trans
+enable_addr_trans:
+	/* enable address translation */
+	mfmsr	r5
+	ori	r5, r5, (MSR_IR | MSR_DR)
+	mtmsr	r5
+	isync
+	blr
+
+	.globl disable_addr_trans
+disable_addr_trans:
+	/* disable address translation */
+	mflr	r4
+	mfmsr	r3
+	andi.	r0, r3, (MSR_IR | MSR_DR)
+	beqlr
+	andc	r3, r3, r0
+	mtspr	SRR0, r4
+	mtspr	SRR1, r3
+	rfi
+
+/*
+ * 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
+
+	.globl	dc_read
+dc_read:
+	blr
+
+	.globl get_pvr
+get_pvr:
+	mfspr	r3, PVR
+	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 Global 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
+	/* then the one used by the C code */
+	add	r30, r30, r15
+
+	/*
+	 * Now relocate code
+	 */
+#ifdef CONFIG_ECC
+	bl	board_relocate_rom
+	sync
+	mr	r3, r10				/* 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	*/
+#else
+	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
+#endif
+/*
+ * 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
+
+in_ram:
+#ifdef CONFIG_ECC
+	bl	board_init_ecc
+#endif
+	/*
+	 * 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, r10		/* Destination Address		*/
+	bl	after_reloc
+
+	/* not reached - end relocate_code */
+/*-----------------------------------------------------------------------*/
+
+	/* 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
+
+	/* enable execptions from RAM vectors */
+	mfmsr	r7
+	li	r8,MSR_IP
+	andc	r7,r7,r8
+	mtmsr	r7
+
+	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)
+
+	sync
+	isync
+
+	blr
+
+#ifdef CFG_INIT_RAM_LOCK
+lock_ram_in_cache:
+	/* Allocate Initial RAM in data cache.
+	 */
+	lis	r3, (CFG_INIT_RAM_ADDR & ~31)@h
+	ori	r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l
+	li	r2, ((CFG_INIT_RAM_END & ~31) + \
+		     (CFG_INIT_RAM_ADDR & 31) + 31) / 32
+	mtctr	r2
+1:
+	dcbz	r0, r3
+	addi	r3, r3, 32
+	bdnz	1b
+
+	/* Lock the data cache */
+	mfspr	r0, HID0
+	ori	r0, r0, 0x1000
+	sync
+	mtspr	HID0, r0
+	sync
+	blr
+
+.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, ((CFG_INIT_RAM_END & ~31) + \
+		     (CFG_INIT_RAM_ADDR & 31) + 31) / 32
+	mtctr	r2
+1:	icbi	r0, r3
+	addi	r3, r3, 32
+	bdnz	1b
+	sync			/* Wait for all icbi to complete on bus	*/
+	isync
+
+	/* Unlock the data cache and invalidate it */
+	mfspr   r0, HID0
+	li      r3,0x1000
+	andc    r0,r0,r3
+	li	r3,0x0400
+	or	r0,r0,r3
+	sync
+	mtspr   HID0, r0
+	sync
+	blr
+#endif
diff --git a/cpu/mpc8260/start.S b/cpu/mpc8260/start.S
new file mode 100644
index 0000000000..10a8988ee8
--- /dev/null
+++ b/cpu/mpc8260/start.S
@@ -0,0 +1,1092 @@
+/*
+ *  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
+ */
+
+/*
+ *  U-Boot - Startup Code for MPC8260 PowerPC based Embedded Boards
+ */
+#include <config.h>
+#include <mpc8260.h>
+#include <version.h>
+
+#define CONFIG_8260 1		/* needed for Linux kernel header files */
+#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
+
+/* We don't want the  MMU yet.
+*/
+#undef	MSR_KERNEL
+/* Floating Point enable, Machine Check and Recoverable Interr. */
+#ifdef DEBUG
+#define MSR_KERNEL (MSR_FP|MSR_RI)
+#else
+#define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
+#endif
+
+/*
+ * 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)
+#if defined(CONFIG_HYMOD)
+	GOT_ENTRY(environment)
+#endif
+	END_GOT
+
+/*
+ * Version string - must be in data segment because MPC8260 uses the first
+ * 256 bytes for the Hard Reset Configuration Word table (see below).
+ * Similarly, can't have the U-Boot Magic Number as the first thing in
+ * the image - don't know how this will affect the image tools, but I guess
+ * I'll find out soon
+ */
+	.data
+	.globl	version_string
+version_string:
+	.ascii U_BOOT_VERSION
+	.ascii " (", __DATE__, " - ", __TIME__, ")"
+	.ascii CONFIG_IDENT_STRING, "\0"
+
+/*
+ *  Hard Reset Configuration Word (HRCW) table
+ *
+ *  The Hard Reset Configuration Word (HRCW) sets a number of useful things
+ *  such as whether there is an external memory controller, whether the
+ *  PowerPC core is disabled (i.e. only the communications processor is
+ *  active, accessed by another CPU on the bus), whether using external
+ *  arbitration, external bus mode, boot port size, core initial prefix,
+ *  internal space base, boot memory space, etc.
+ *
+ *  These things dictate where the processor begins execution, where the
+ *  boot ROM appears in memory, the memory controller setup when access
+ *  boot ROM, etc. The HRCW is *extremely* important.
+ *
+ *  The HRCW is read from the bus during reset. One CPU on the bus will
+ *  be a hard reset configuration master, any others will be hard reset
+ *  configuration slaves. The master reads eight HRCWs from flash during
+ *  reset - the first it uses for itself, the other 7 it communicates to
+ *  up to 7 configuration slaves by some complicated mechanism, which is
+ *  not really important here.
+ *
+ *  The configuration master performs 32 successive reads starting at address
+ *  0 and incrementing by 8 each read (i.e. on 64 bit boundaries) but only 8
+ *  bits is read, and always from byte lane D[0-7] (so that port size of the
+ *  boot device does not matter). The first four reads form the 32 bit HRCW
+ *  for the master itself. The second four reads form the HRCW for the first
+ *  slave, and so on, up to seven slaves. The 32 bit HRCW is formed by
+ *  concatenating the four bytes, with the first read placed in byte 0 (the
+ *  most significant byte), and so on with the fourth read placed in byte 3
+ *  (the least significant byte).
+ */
+#define _HRCW_TABLE_ENTRY(w)		\
+	.fill	8,1,(((w)>>24)&0xff);	\
+	.fill	8,1,(((w)>>16)&0xff);	\
+	.fill	8,1,(((w)>> 8)&0xff);	\
+	.fill	8,1,(((w)    )&0xff)
+	.text
+	.globl	_hrcw_table
+_hrcw_table:
+	_HRCW_TABLE_ENTRY(CFG_HRCW_MASTER)
+	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE1)
+	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE2)
+	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE3)
+	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE4)
+	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE5)
+	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE6)
+	_HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE7)
+/*
+ *  After configuration, a system reset exception is executed using the
+ *  vector at offset 0x100 relative to the base set by MSR[IP]. If MSR[IP]
+ *  is 0, the base address is 0x00000000. If MSR[IP] is 1, the base address
+ *  is 0xfff00000. In the case of a Power On Reset or Hard Reset, the value
+ *  of MSR[IP] is determined by the CIP field in the HRCW.
+ *
+ *  Other bits in the HRCW set up the Base Address and Port Size in BR0.
+ *  This determines the location of the boot ROM (flash or EPROM) in the
+ *  processor's address space at boot time. As long as the HRCW is set up
+ *  so that we eventually end up executing the code below when the processor
+ *  executes the reset exception, the actual values used should not matter.
+ *
+ *  Once we have got here, the address mask in OR0 is cleared so that the
+ *  bottom 32K of the boot ROM is effectively repeated all throughout the
+ *  processor's address space, after which we can jump to the absolute
+ *  address at which the boot ROM was linked at compile time, and proceed
+ *  to initialise the memory controller without worrying if the rug will be
+ *  pulled out from under us, so to speak (it will be fine as long as we
+ *  configure BR0 with the same boot ROM link address).
+ */
+	. = EXC_OFF_SYS_RESET
+
+	.globl	_start
+_start:
+	li	r21, BOOTFLAG_COLD	/* Normal Power-On: Boot from FLASH*/
+	b	boot_cold
+
+	. = EXC_OFF_SYS_RESET + 0x10
+
+	.globl	_start_warm
+_start_warm:
+	li	r21, BOOTFLAG_WARM	/* Software reboot		*/
+	b	boot_warm
+
+boot_cold:
+boot_warm:
+	mfmsr	r5			/* save msr contents		*/
+
+#if defined(CONFIG_COGENT)
+	/* this is what the cogent EPROM does */
+	li	r0, 0
+	mtmsr	r0
+	isync
+	bl	cogent_init_8260
+#endif	/* CONFIG_COGENT */
+
+#if defined(CFG_DEFAULT_IMMR)
+	lis	r3, CFG_IMMR@h
+	ori	r3, r3, CFG_IMMR@l
+	lis	r4, CFG_DEFAULT_IMMR@h
+	stw	r3, 0x1A8(r4)
+#endif /* CFG_DEFAULT_IMMR */
+
+	/* Initialise the MPC8260 processor core			*/
+	/*--------------------------------------------------------------*/
+
+	bl	init_8260_core
+
+#ifndef CFG_RAMBOOT
+	/* When booting from ROM (Flash or EPROM), clear the		*/
+	/* Address Mask in OR0 so ROM appears everywhere		*/
+	/*--------------------------------------------------------------*/
+
+	lis	r3, (CFG_IMMR+IM_REGBASE)@h
+	lwz	r4, IM_OR0@l(r3)
+	li	r5, 0x7fff
+	and	r4, r4, r5
+	stw	r4, IM_OR0@l(r3)
+
+	/* 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 */
+
+	/* initialize some things that are hard to access from C	*/
+	/*--------------------------------------------------------------*/
+
+	lis	r3, CFG_IMMR@h		/* set up stack in internal DPRAM */
+	ori	r1, r3, CFG_INIT_SP_OFFSET
+	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	*/
+
+	/* let the C-code set up the rest				*/
+	/*								*/
+	/* Be careful to keep code relocatable !			*/
+	/*--------------------------------------------------------------*/
+
+	GET_GOT			/* initialize GOT access		*/
+
+	/* r3: IMMR */
+	bl	cpu_init_f	/* run low-level CPU init code (in Flash)*/
+
+#ifdef DEBUG
+	bl	init_debug	/* set up debugging stuff		*/
+#endif
+
+	mr	r3, r21
+	/* r3: BOOTFLAG */
+	bl	board_init_f	/* run 1st part of board init code (in Flash)*/
+
+/*
+ * Vector Table
+ */
+
+	.globl	_start_of_vectors
+_start_of_vectors:
+
+/* 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 */
+	rlwimi	r20,r23,0,25,25		/* copy IP 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 */
+	rlwimi	r20,r23,0,25,25		/* copy IP 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
+
+	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)
+
+	STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException)
+	STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException)
+	STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException)
+#ifdef DEBUG
+	. = 0x1300
+	/*
+	 * This exception occurs when the program counter matches the
+	 * Instruction Address Breakpoint Register (IABR).
+	 *
+	 * I want the cpu to halt if this occurs so I can hunt around
+	 * with the debugger and look at things.
+	 *
+	 * When DEBUG is defined, both machine check enable (in the MSR)
+	 * and checkstop reset enable (in the reset mode register) are
+	 * turned off and so a checkstop condition will result in the cpu
+	 * halting.
+	 *
+	 * I force the cpu into a checkstop condition by putting an illegal
+	 * instruction here (at least this is the theory).
+	 *
+	 * well - that didnt work, so just do an infinite loop!
+	 */
+1:	b	1b
+#else
+	STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException)
+#endif
+	STD_EXCEPTION(0x1400, SMI, UnknownException)
+
+	STD_EXCEPTION(0x1500, Trap_15, UnknownException)
+	STD_EXCEPTION(0x1600, Trap_16, UnknownException)
+	STD_EXCEPTION(0x1700, Trap_17, UnknownException)
+	STD_EXCEPTION(0x1800, Trap_18, UnknownException)
+	STD_EXCEPTION(0x1900, Trap_19, UnknownException)
+	STD_EXCEPTION(0x1a00, Trap_1a, UnknownException)
+	STD_EXCEPTION(0x1b00, Trap_1b, UnknownException)
+	STD_EXCEPTION(0x1c00, Trap_1c, UnknownException)
+	STD_EXCEPTION(0x1d00, Trap_1d, UnknownException)
+	STD_EXCEPTION(0x1e00, Trap_1e, UnknownException)
+	STD_EXCEPTION(0x1f00, Trap_1f, UnknownException)
+	STD_EXCEPTION(0x2000, Trap_20, UnknownException)
+	STD_EXCEPTION(0x2100, Trap_21, UnknownException)
+	STD_EXCEPTION(0x2200, Trap_22, UnknownException)
+	STD_EXCEPTION(0x2300, Trap_23, UnknownException)
+	STD_EXCEPTION(0x2400, Trap_24, UnknownException)
+	STD_EXCEPTION(0x2500, Trap_25, UnknownException)
+	STD_EXCEPTION(0x2600, Trap_26, UnknownException)
+	STD_EXCEPTION(0x2700, Trap_27, UnknownException)
+	STD_EXCEPTION(0x2800, Trap_28, UnknownException)
+	STD_EXCEPTION(0x2900, Trap_29, UnknownException)
+	STD_EXCEPTION(0x2a00, Trap_2a, UnknownException)
+	STD_EXCEPTION(0x2b00, Trap_2b, UnknownException)
+	STD_EXCEPTION(0x2c00, Trap_2c, UnknownException)
+	STD_EXCEPTION(0x2d00, Trap_2d, UnknownException)
+	STD_EXCEPTION(0x2e00, Trap_2e, UnknownException)
+	STD_EXCEPTION(0x2f00, Trap_2f, UnknownException)
+
+
+	.globl	_end_of_vectors
+_end_of_vectors:
+
+	. = 0x3000
+
+/*
+ * 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)
+	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
+
+#if defined(CONFIG_COGENT)
+
+/*
+ * This code initialises the MPC8260 processor core
+ * (conforms to PowerPC 603e spec)
+ */
+
+	.globl	cogent_init_8260
+cogent_init_8260:
+
+	/* Taken from page 14 of CMA282 manual				*/
+	/*--------------------------------------------------------------*/
+
+	lis	r4, (CFG_IMMR+IM_REGBASE)@h
+	lis	r3, CFG_IMMR@h
+	stw	r3, IM_IMMR@l(r4)
+	lwz	r3, IM_IMMR@l(r4)
+	stw	r3, 0(r0)
+	lis	r3, CFG_SYPCR@h
+	ori	r3, r3, CFG_SYPCR@l
+	stw	r3, IM_SYPCR@l(r4)
+	lwz	r3, IM_SYPCR@l(r4)
+	stw	r3, 4(r0)
+	lis	r3, CFG_SCCR@h
+	ori	r3, r3, CFG_SCCR@l
+	stw	r3, IM_SCCR@l(r4)
+	lwz	r3, IM_SCCR@l(r4)
+	stw	r3, 8(r0)
+
+	/* the rest of this was disassembled from the			*/
+	/* EPROM code that came with my CMA282 CPU module		*/
+	/*--------------------------------------------------------------*/
+
+	lis	r1, 0x1234
+	ori	r1, r1, 0x5678
+	stw	r1, 0x20(r0)
+	lwz	r1, 0x20(r0)
+	stw	r1, 0x24(r0)
+	lwz	r1, 0x24(r0)
+	lis	r3, 0x0e80
+	ori	r3, r3, 0
+	stw	r1, 4(r3)
+	lwz	r1, 4(r3)
+
+	/* Done!							*/
+	/*--------------------------------------------------------------*/
+
+	blr
+
+#endif	/* CONFIG_COGENT */
+
+/*
+ * This code initialises the MPC8260 processor core
+ * (conforms to PowerPC 603e spec)
+ * Note: expects original MSR contents to be in r5.
+ */
+
+	.globl	init_8260_core
+init_8260_core:
+
+	/* Initialize machine status; enable machine check interrupt	*/
+	/*--------------------------------------------------------------*/
+
+	li	r3, MSR_KERNEL		/* Set ME and RI flags */
+	rlwimi	r3, r5, 0, 25, 25	/* preserve IP bit set by HRCW */
+#ifdef DEBUG
+	rlwimi	r3, r5, 0, 21, 22	/* debugger might set SE & BE bits */
+#endif
+	SYNC				/* Some chip revs need this... */
+	mtmsr	r3
+	SYNC
+	mtspr	SRR1, r3		/* Make SRR1 match MSR */
+
+	/* Initialise the SYPCR early, and reset the watchdog (if req)	*/
+	/*--------------------------------------------------------------*/
+
+	lis	r3, (CFG_IMMR+IM_REGBASE)@h
+#if !defined(CONFIG_COGENT)
+	lis	r4, CFG_SYPCR@h
+	ori	r4, r4, CFG_SYPCR@l
+	stw	r4, IM_SYPCR@l(r3)
+#endif /* !CONFIG_COGENT */
+#if defined(CONFIG_WATCHDOG)
+	li	r4, 21868		/* = 0x556c */
+	sth	r4, IM_SWSR@l(r3)
+	li	r4, -21959		/* = 0xaa39 */
+	sth	r4, IM_SWSR@l(r3)
+#endif /* CONFIG_WATCHDOG */
+
+	/* Initialize the Hardware Implementation-dependent Registers	*/
+	/* HID0 also contains cache control				*/
+	/*--------------------------------------------------------------*/
+
+	lis	r3, CFG_HID0_INIT@h
+	ori	r3, r3, CFG_HID0_INIT@l
+	SYNC
+	mtspr	HID0, r3
+
+	lis	r3, CFG_HID0_FINAL@h
+	ori	r3, r3, CFG_HID0_FINAL@l
+	SYNC
+	mtspr	HID0, r3
+
+	lis	r3, CFG_HID2@h
+	ori	r3, r3, CFG_HID2@l
+	mtspr	HID2, r3
+
+	/* clear all BAT's						*/
+	/*--------------------------------------------------------------*/
+
+	li	r0, 0
+	mtspr	DBAT0U, r0
+	mtspr	DBAT0L, r0
+	mtspr	DBAT1U, r0
+	mtspr	DBAT1L, r0
+	mtspr	DBAT2U, r0
+	mtspr	DBAT2L, r0
+	mtspr	DBAT3U, r0
+	mtspr	DBAT3L, r0
+	mtspr	IBAT0U, r0
+	mtspr	IBAT0L, r0
+	mtspr	IBAT1U, r0
+	mtspr	IBAT1L, r0
+	mtspr	IBAT2U, r0
+	mtspr	IBAT2L, r0
+	mtspr	IBAT3U, r0
+	mtspr	IBAT3L, r0
+	SYNC
+
+	/* invalidate all tlb's						*/
+	/*								*/
+	/* From the 603e User Manual: "The 603e provides the ability to	*/
+	/* invalidate a TLB entry. The TLB Invalidate Entry (tlbie)	*/
+	/* instruction invalidates the TLB entry indexed by the EA, and	*/
+	/* operates on both the instruction and data TLBs simultaneously*/
+	/* invalidating four TLB entries (both sets in each TLB). The	*/
+	/* index corresponds to bits 15-19 of the EA. To invalidate all	*/
+	/* entries within both TLBs, 32 tlbie instructions should be	*/
+	/* issued, incrementing this field by one each time."		*/
+	/*								*/
+	/* "Note that the tlbia instruction is not implemented on the	*/
+	/* 603e."							*/
+	/*								*/
+	/* bits 15-19 correspond to addresses 0x00000000 to 0x0001F000	*/
+	/* incrementing by 0x1000 each time. The code below is sort of	*/
+	/* based on code in "flush_tlbs" from arch/ppc/kernel/head.S	*/
+	/*								*/
+	/*--------------------------------------------------------------*/
+
+	li	r3, 32
+	mtctr	r3
+	li	r3, 0
+1:	tlbie	r3
+	addi	r3, r3, 0x1000
+	bdnz	1b
+	SYNC
+
+	/* Done!							*/
+	/*--------------------------------------------------------------*/
+
+	blr
+
+#ifdef DEBUG
+
+/*
+ * initialise things related to debugging.
+ *
+ * must be called after the global offset table (GOT) is initialised
+ * (GET_GOT) and after cpu_init_f() has executed.
+ */
+
+	.globl	init_debug
+init_debug:
+
+	lis	r3, (CFG_IMMR+IM_REGBASE)@h
+
+	/* Quick and dirty hack to enable the RAM and copy the		*/
+	/* vectors so that we can take exceptions.			*/
+	/*--------------------------------------------------------------*/
+	/* write Memory Refresh Prescaler */
+	li	r4, CFG_MPTPR
+	sth	r4, IM_MPTPR@l(r3)
+	/* write 60x Refresh Timer */
+	li	r4, CFG_PSRT
+	stb	r4, IM_PSRT@l(r3)
+	/* init the 60x SDRAM Mode Register */
+	lis	r4, (CFG_PSDMR|PSDMR_OP_NORM)@h
+	ori	r4, r4, (CFG_PSDMR|PSDMR_OP_NORM)@l
+	stw	r4, IM_PSDMR@l(r3)
+	/* write Precharge All Banks command */
+	lis	r4, (CFG_PSDMR|PSDMR_OP_PREA)@h
+	ori	r4, r4, (CFG_PSDMR|PSDMR_OP_PREA)@l
+	stw	r4, IM_PSDMR@l(r3)
+	stb	r0, 0(0)
+	/* write eight CBR Refresh commands */
+	lis	r4, (CFG_PSDMR|PSDMR_OP_CBRR)@h
+	ori	r4, r4, (CFG_PSDMR|PSDMR_OP_CBRR)@l
+	stw	r4, IM_PSDMR@l(r3)
+	stb	r0, 0(0)
+	stb	r0, 0(0)
+	stb	r0, 0(0)
+	stb	r0, 0(0)
+	stb	r0, 0(0)
+	stb	r0, 0(0)
+	stb	r0, 0(0)
+	stb	r0, 0(0)
+	/* write Mode Register Write command */
+	lis	r4, (CFG_PSDMR|PSDMR_OP_MRW)@h
+	ori	r4, r4, (CFG_PSDMR|PSDMR_OP_MRW)@l
+	stw	r4, IM_PSDMR@l(r3)
+	stb	r0, 0(0)
+	/* write Normal Operation command and enable Refresh */
+	lis	r4, (CFG_PSDMR|PSDMR_OP_NORM|PSDMR_RFEN)@h
+	ori	r4, r4, (CFG_PSDMR|PSDMR_OP_NORM|PSDMR_RFEN)@l
+	stw	r4, IM_PSDMR@l(r3)
+	stb	r0, 0(0)
+	/* RAM should now be operational */
+
+#define VEC_WRD_CNT	((_end_of_vectors - _start + EXC_OFF_SYS_RESET) / 4)
+
+	lwz	r3, GOT(_end_of_vectors)
+	rlwinm	r4, r3, 0, 18, 31	/* _end_of_vectors & 0x3FFF	*/
+	lis	r5, VEC_WRD_CNT@h
+	ori	r5, r5, VEC_WRD_CNT@l
+	mtctr	r5
+1:
+	lwzu	r5, -4(r3)
+	stwu	r5, -4(r4)
+	bdnz	1b
+
+	/* Load the Instruction Address Breakpoint Register (IABR).	*/
+	/* 								*/
+	/* The address to load is stored in the first word of dual port	*/
+	/* ram and should be preserved while the power is on, so you	*/
+	/* can plug addresses into that location then reset the cpu and	*/
+	/* this code will load that address into the IABR after the	*/
+	/* reset.							*/
+	/* 								*/
+	/* When the program counter matches the contents of the IABR,	*/
+	/* an exception is generated (before the instruction at that	*/
+	/* location completes). The vector for this exception is 0x1300 */
+	/*--------------------------------------------------------------*/
+	lis	r3, CFG_IMMR@h
+	lwz	r3, 0(r3)
+	mtspr	IABR, r3
+
+	/* Set the entire dual port RAM (where the initial stack	*/
+	/* resides) to a known value - makes it easier to see where	*/
+	/* the stack has been written					*/
+	/*--------------------------------------------------------------*/
+	lis	r3, (CFG_IMMR + CFG_INIT_SP_OFFSET)@h
+	ori	r3, r3, (CFG_IMMR + CFG_INIT_SP_OFFSET)@l
+	li	r4, ((CFG_INIT_SP_OFFSET - 4) / 4)
+	mtctr	r4
+	lis	r4, 0xdeadbeaf@h
+	ori	r4, r4, 0xdeadbeaf@l
+1:
+	stwu	r4, -4(r3)
+	bdnz	1b
+
+	/* Done!							*/
+	/*--------------------------------------------------------------*/
+
+	blr
+#endif
+
+/* Cache functions.
+ *
+ * Note: requires that all cache bits in
+ * HID0 are in the low half word.
+ */
+	.globl	icache_enable
+icache_enable:
+	mfspr	r3, HID0
+	ori	r3, r3, HID0_ICE
+	lis	r4, 0
+	ori	r4, r4, HID0_ILOCK
+	andc	r3, r3, r4
+	ori	r4, r3, HID0_ICFI
+	isync
+	mtspr	HID0, r4	/* sets enable and invalidate, clears lock */
+	isync
+	mtspr	HID0, r3	/* clears invalidate */
+	blr
+
+	.globl	icache_disable
+icache_disable:
+	mfspr	r3, HID0
+	lis	r4, 0
+	ori	r4, r4, HID0_ICE|HID0_ILOCK
+	andc	r3, r3, r4
+	ori	r4, r3, HID0_ICFI
+	isync
+	mtspr	HID0, r4	/* sets invalidate, clears enable and lock */
+	isync
+	mtspr	HID0, r3	/* clears invalidate */
+	blr
+
+	.globl	icache_status
+icache_status:
+	mfspr	r3, HID0
+	rlwinm	r3, r3, HID0_ICE_BITPOS + 1, 31, 31
+	blr
+
+	.globl	dcache_enable
+dcache_enable:
+	mfspr	r3, HID0
+	ori	r3, r3, HID0_DCE
+	lis	r4, 0
+	ori	r4, r4, HID0_DLOCK
+	andc	r3, r3, r4
+	ori	r4, r3, HID0_DCI
+	sync
+	mtspr	HID0, r4	/* sets enable and invalidate, clears lock */
+	sync
+	mtspr	HID0, r3	/* clears invalidate */
+	blr
+
+	.globl	dcache_disable
+dcache_disable:
+	mfspr	r3, HID0
+	lis	r4, 0
+	ori	r4, r4, HID0_DCE|HID0_DLOCK
+	andc	r3, r3, r4
+	ori	r4, r3, HID0_DCI
+	sync
+	mtspr	HID0, r4	/* sets invalidate, clears enable and lock */
+	sync
+	mtspr	HID0, r3	/* clears invalidate */
+	blr
+
+	.globl	dcache_status
+dcache_status:
+	mfspr	r3, HID0
+	rlwinm	r3, r3, HID0_DCE_BITPOS + 1, 31, 31
+	blr
+
+	.globl get_pvr
+get_pvr:
+	mfspr	r3, PVR
+	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 Global 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
+	/* then 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
+	mfspr	r7,HID0		/* don't do dcbst if dcache is disabled */
+	rlwinm	r7,r7,HID0_DCE_BITPOS+1,31,31
+	cmpwi	r7,0
+	beq	9f
+	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 */
+9:	mfspr	r7,HID0		/* don't do icbi if icache is disabled */
+	rlwinm	r7,r7,HID0_ICE_BITPOS+1,31,31
+	cmpwi	r7,0
+	beq	7f
+	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
+
+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)
+#if defined(CONFIG_HYMOD)
+	/*
+	 * For HYMOD - the environment is the very last item in flash.
+	 * The real .bss stops just before environment starts, so only
+	 * clear up to that point.
+	 *
+	 * taken from mods for FADS board
+	 */
+	lwz	r4,GOT(environment)
+#else
+	lwz	r4,GOT(_end)
+#endif
+
+	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		/* Global 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
+
+	mfmsr	r3			/* now that the vectors have	*/
+	lis	r7, MSR_IP@h		/* relocated into low memory	*/
+	ori	r7, r7, MSR_IP@l	/* MSR[IP] can be turned off	*/
+	andc	r3, r3, r7		/* (if it was on)		*/
+	SYNC				/* Some chip revs need this... */
+	mtmsr	r3
+	SYNC
+
+	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