arch/arm/cpu/arm720t/start.S - platform/external/u-boot - Gitiles

 /*
  *  armboot - Startup Code for ARM720 CPU-core
  *
  *  Copyright (c) 2001	Marius Gröger <mag@sysgo.de>
  *  Copyright (c) 2002	Alex Züpke <azu@sysgo.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
  */

 #include <asm-offsets.h>
 #include <config.h>
 #include <version.h>
 #include <asm/hardware.h>

 /*
  *************************************************************************
  *
  * Jump vector table as in table 3.1 in [1]
  *
  *************************************************************************
  */


 .globl _start
 _start: b	reset
 	ldr	pc, _undefined_instruction
 	ldr	pc, _software_interrupt
 	ldr	pc, _prefetch_abort
 	ldr	pc, _data_abort
 #ifdef CONFIG_LPC2292
 	.word	0xB4405F76 /* 2's complement of the checksum of the vectors */
 #else
 	ldr	pc, _not_used
 #endif
 	ldr	pc, _irq
 	ldr	pc, _fiq

 _undefined_instruction: .word undefined_instruction
 _software_interrupt:	.word software_interrupt
 _prefetch_abort:	.word prefetch_abort
 _data_abort:		.word data_abort
 _not_used:		.word not_used
 _irq:			.word irq
 _fiq:			.word fiq

 	.balignl 16,0xdeadbeef


 /*
  *************************************************************************
  *
  * Startup Code (reset vector)
  *
  * do important init only if we don't start from RAM!
  * relocate armboot to ram
  * setup stack
  * jump to second stage
  *
  *************************************************************************
  */

 .globl _TEXT_BASE
 _TEXT_BASE:
 	.word	CONFIG_SYS_TEXT_BASE

 /*
  * These are defined in the board-specific linker script.
  * Subtracting _start from them lets the linker put their
  * relative position in the executable instead of leaving
  * them null.
  */
 .globl _bss_start_ofs
 _bss_start_ofs:
 	.word __bss_start - _start

 .globl _bss_end_ofs
 _bss_end_ofs:
 	.word __bss_end__ - _start

 .globl _end_ofs
 _end_ofs:
 	.word _end - _start

 #ifdef CONFIG_USE_IRQ
 /* IRQ stack memory (calculated at run-time) */
 .globl IRQ_STACK_START
 IRQ_STACK_START:
 	.word	0x0badc0de

 /* IRQ stack memory (calculated at run-time) */
 .globl FIQ_STACK_START
 FIQ_STACK_START:
 	.word 0x0badc0de
 #endif

 /* IRQ stack memory (calculated at run-time) + 8 bytes */
 .globl IRQ_STACK_START_IN
 IRQ_STACK_START_IN:
 	.word	0x0badc0de

 /*
  * the actual reset code
  */

 reset:
 	/*
 	 * set the cpu to SVC32 mode
 	 */
 	mrs	r0,cpsr
 	bic	r0,r0,#0x1f
 	orr	r0,r0,#0xd3
 	msr	cpsr,r0

 	/*
 	 * we do sys-critical inits only at reboot,
 	 * not when booting from ram!
 	 */
 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
 	bl	cpu_init_crit
 #endif

 #ifdef CONFIG_LPC2292
 	bl	lowlevel_init
 #endif

 /* Set stackpointer in internal RAM to call board_init_f */
 call_board_init_f:
 	ldr	sp, =(CONFIG_SYS_INIT_SP_ADDR)
 	bic	sp, sp, #7 /* 8-byte alignment for ABI compliance */
 	ldr	r0,=0x00000000
 	bl	board_init_f

 /*------------------------------------------------------------------------------*/

 /*
  * void relocate_code (addr_sp, gd, addr_moni)
  *
  * This "function" does not return, instead it continues in RAM
  * after relocating the monitor code.
  *
  */
 	.globl	relocate_code
 relocate_code:
 	mov	r4, r0	/* save addr_sp */
 	mov	r5, r1	/* save addr of gd */
 	mov	r6, r2	/* save addr of destination */

 	/* Set up the stack						    */
 stack_setup:
 	mov	sp, r4

 	adr	r0, _start
 	cmp	r0, r6
 	beq	clear_bss		/* skip relocation */
 	mov	r1, r6			/* r1 <- scratch for copy_loop */
 	ldr	r3, _bss_start_ofs
 	add	r2, r0, r3		/* r2 <- source end address	    */

 copy_loop:
 	ldmia	r0!, {r9-r10}		/* copy from source address [r0]    */
 	stmia	r1!, {r9-r10}		/* copy to   target address [r1]    */
 	cmp	r0, r2			/* until source end address [r2]    */
 	blo	copy_loop

 #ifndef CONFIG_SPL_BUILD
 	/*
 	 * fix .rel.dyn relocations
 	 */
 	ldr	r0, _TEXT_BASE		/* r0 <- Text base */
 	sub	r9, r6, r0		/* r9 <- relocation offset */
 	ldr	r10, _dynsym_start_ofs	/* r10 <- sym table ofs */
 	add	r10, r10, r0		/* r10 <- sym table in FLASH */
 	ldr	r2, _rel_dyn_start_ofs	/* r2 <- rel dyn start ofs */
 	add	r2, r2, r0		/* r2 <- rel dyn start in FLASH */
 	ldr	r3, _rel_dyn_end_ofs	/* r3 <- rel dyn end ofs */
 	add	r3, r3, r0		/* r3 <- rel dyn end in FLASH */
 fixloop:
 	ldr	r0, [r2]		/* r0 <- location to fix up, IN FLASH! */
 	add	r0, r0, r9		/* r0 <- location to fix up in RAM */
 	ldr	r1, [r2, #4]
 	and	r7, r1, #0xff
 	cmp	r7, #23			/* relative fixup? */
 	beq	fixrel
 	cmp	r7, #2			/* absolute fixup? */
 	beq	fixabs
 	/* ignore unknown type of fixup */
 	b	fixnext
 fixabs:
 	/* absolute fix: set location to (offset) symbol value */
 	mov	r1, r1, LSR #4		/* r1 <- symbol index in .dynsym */
 	add	r1, r10, r1		/* r1 <- address of symbol in table */
 	ldr	r1, [r1, #4]		/* r1 <- symbol value */
 	add	r1, r1, r9		/* r1 <- relocated sym addr */
 	b	fixnext
 fixrel:
 	/* relative fix: increase location by offset */
 	ldr	r1, [r0]
 	add	r1, r1, r9
 fixnext:
 	str	r1, [r0]
 	add	r2, r2, #8		/* each rel.dyn entry is 8 bytes */
 	cmp	r2, r3
 	blo	fixloop
 #endif

 clear_bss:
 #ifndef CONFIG_SPL_BUILD
 	ldr	r0, _bss_start_ofs
 	ldr	r1, _bss_end_ofs
 	mov	r4, r6			/* reloc addr */
 	add	r0, r0, r4
 	add	r1, r1, r4
 	mov	r2, #0x00000000		/* clear			    */

 clbss_l:str	r2, [r0]		/* clear loop...		    */
 	add	r0, r0, #4
 	cmp	r0, r1
 	bne	clbss_l

 	bl coloured_LED_init
 	bl red_LED_on
 #endif

 /*
  * We are done. Do not return, instead branch to second part of board
  * initialization, now running from RAM.
  */
 	ldr	r0, _board_init_r_ofs
 	adr	r1, _start
 	add	lr, r0, r1
 	add	lr, lr, r9
 	/* setup parameters for board_init_r */
 	mov	r0, r5		/* gd_t */
 	mov	r1, r6		/* dest_addr */
 	/* jump to it ... */
 	mov	pc, lr

 _board_init_r_ofs:
 	.word board_init_r - _start

 _rel_dyn_start_ofs:
 	.word __rel_dyn_start - _start
 _rel_dyn_end_ofs:
 	.word __rel_dyn_end - _start
 _dynsym_start_ofs:
 	.word __dynsym_start - _start

 /*
  *************************************************************************
  *
  * CPU_init_critical registers
  *
  * setup important registers
  * setup memory timing
  *
  *************************************************************************
  */

 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)

 /* Interrupt-Controller base addresses */
 INTMR1:		.word	0x80000280 @ 32 bit size
 INTMR2:		.word	0x80001280 @ 16 bit size
 INTMR3:		.word	0x80002280 @  8 bit size

 /* SYSCONs */
 SYSCON1:	.word	0x80000100
 SYSCON2:	.word	0x80001100
 SYSCON3:	.word	0x80002200

 #define CLKCTL	       0x6  /* mask */
 #define CLKCTL_18      0x0  /* 18.432 MHz */
 #define CLKCTL_36      0x2  /* 36.864 MHz */
 #define CLKCTL_49      0x4  /* 49.152 MHz */
 #define CLKCTL_73      0x6  /* 73.728 MHz */

 #elif defined(CONFIG_LPC2292)
 PLLCFG_ADR:	.word	PLLCFG
 PLLFEED_ADR:	.word	PLLFEED
 PLLCON_ADR:	.word	PLLCON
 PLLSTAT_ADR:	.word	PLLSTAT
 VPBDIV_ADR:	.word	VPBDIV
 MEMMAP_ADR:	.word	MEMMAP

 #endif

 cpu_init_crit:
 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)

 	/*
 	 * mask all IRQs by clearing all bits in the INTMRs
 	 */
 	mov	r1, #0x00
 	ldr	r0, INTMR1
 	str	r1, [r0]
 	ldr	r0, INTMR2
 	str	r1, [r0]
 	ldr	r0, INTMR3
 	str	r1, [r0]

 	/*
 	 * flush v4 I/D caches
 	 */
 	mov	r0, #0
 	mcr	p15, 0, r0, c7, c7, 0	/* flush v3/v4 cache */
 	mcr	p15, 0, r0, c8, c7, 0	/* flush v4 TLB */

 	/*
 	 * disable MMU stuff and caches
 	 */
 	mrc	p15,0,r0,c1,c0
 	bic	r0, r0, #0x00002300	@ clear bits 13, 9:8 (--V- --RS)
 	bic	r0, r0, #0x0000008f	@ clear bits 7, 3:0 (B--- WCAM)
 	orr	r0, r0, #0x00000002	@ set bit 2 (A) Align
 	mcr	p15,0,r0,c1,c0
 #elif defined(CONFIG_NETARM)
 	/*
 	 * prior to software reset : need to set pin PORTC4 to be *HRESET
 	 */
 	ldr	r0, =NETARM_GEN_MODULE_BASE
 	ldr	r1, =(NETARM_GEN_PORT_MODE(0x10) | \
 			NETARM_GEN_PORT_DIR(0x10))
 	str	r1, [r0, #+NETARM_GEN_PORTC]
 	/*
 	 * software reset : see HW Ref. Guide 8.2.4 : Software Service register
 	 *		    for an explanation of this process
 	 */
 	ldr	r0, =NETARM_GEN_MODULE_BASE
 	ldr	r1, =NETARM_GEN_SW_SVC_RESETA
 	str	r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
 	ldr	r1, =NETARM_GEN_SW_SVC_RESETB
 	str	r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
 	ldr	r1, =NETARM_GEN_SW_SVC_RESETA
 	str	r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
 	ldr	r1, =NETARM_GEN_SW_SVC_RESETB
 	str	r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
 	/*
 	 * setup PLL and System Config
 	 */
 	ldr	r0, =NETARM_GEN_MODULE_BASE

 	ldr	r1, =(	NETARM_GEN_SYS_CFG_LENDIAN | \
 			NETARM_GEN_SYS_CFG_BUSFULL | \
 			NETARM_GEN_SYS_CFG_USER_EN | \
 			NETARM_GEN_SYS_CFG_ALIGN_ABORT | \
 			NETARM_GEN_SYS_CFG_BUSARB_INT | \
 			NETARM_GEN_SYS_CFG_BUSMON_EN )

 	str	r1, [r0, #+NETARM_GEN_SYSTEM_CONTROL]

 #ifndef CONFIG_NETARM_PLL_BYPASS
 	ldr	r1, =(	NETARM_GEN_PLL_CTL_PLLCNT(NETARM_PLL_COUNT_VAL) | \
 			NETARM_GEN_PLL_CTL_POLTST_DEF | \
 			NETARM_GEN_PLL_CTL_INDIV(1) | \
 			NETARM_GEN_PLL_CTL_ICP_DEF | \
 			NETARM_GEN_PLL_CTL_OUTDIV(2) )
 	str	r1, [r0, #+NETARM_GEN_PLL_CONTROL]
 #endif

 	/*
 	 * mask all IRQs by clearing all bits in the INTMRs
 	 */
 	mov	r1, #0
 	ldr	r0, =NETARM_GEN_MODULE_BASE
 	str	r1, [r0, #+NETARM_GEN_INTR_ENABLE]

 #elif defined(CONFIG_S3C4510B)

 	/*
 	 * Mask off all IRQ sources
 	 */
 	ldr	r1, =REG_INTMASK
 	ldr	r0, =0x3FFFFF
 	str	r0, [r1]

 	/*
 	 * Disable Cache
 	 */
 	ldr r0, =REG_SYSCFG
 	ldr r1, =0x83ffffa0	/* cache-disabled  */
 	str r1, [r0]

 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
 	/* No specific initialisation for IntegratorAP/CM720T as yet */
 #elif defined(CONFIG_LPC2292)
 	/* Set-up PLL */
 	mov	r3, #0xAA
 	mov	r4, #0x55
 	/* First disconnect and disable the PLL */
 	ldr	r0, PLLCON_ADR
 	mov	r1, #0x00
 	str	r1, [r0]
 	ldr	r0, PLLFEED_ADR /* start feed sequence */
 	str	r3, [r0]
 	str	r4, [r0]	/* feed sequence done */
 	/* Set new M and P values */
 	ldr	r0, PLLCFG_ADR
 	mov	r1, #0x23	/* M=4 and P=2 */
 	str	r1, [r0]
 	ldr	r0, PLLFEED_ADR /* start feed sequence */
 	str	r3, [r0]
 	str	r4, [r0]	/* feed sequence done */
 	/* Then enable the PLL */
 	ldr	r0, PLLCON_ADR
 	mov	r1, #0x01	/* PLL enable bit */
 	str	r1, [r0]
 	ldr	r0, PLLFEED_ADR /* start feed sequence */
 	str	r3, [r0]
 	str	r4, [r0]	/* feed sequence done */
 	/* Wait for the lock */
 	ldr	r0, PLLSTAT_ADR
 	mov	r1, #0x400	/* lock bit */
 lock_loop:
 	ldr	r2, [r0]
 	and	r2, r1, r2
 	cmp	r2, #0
 	beq	lock_loop
 	/* And finally connect the PLL */
 	ldr	r0, PLLCON_ADR
 	mov	r1, #0x03	/* PLL enable bit and connect bit */
 	str	r1, [r0]
 	ldr	r0, PLLFEED_ADR /* start feed sequence */
 	str	r3, [r0]
 	str	r4, [r0]	/* feed sequence done */
 	/* Set-up VPBDIV register */
 	ldr	r0, VPBDIV_ADR
 	mov	r1, #0x01	/* VPB clock is same as process clock */
 	str	r1, [r0]
 #else
 #error No cpu_init_crit() defined for current CPU type
 #endif

 #ifdef CONFIG_ARM7_REVD
 	/* set clock speed */
 	/* !!! we run @ 36 MHz due to a hardware flaw in Rev. D processors */
 	/* !!! not doing DRAM refresh properly! */
 	ldr	r0, SYSCON3
 	ldr	r1, [r0]
 	bic	r1, r1, #CLKCTL
 	orr	r1, r1, #CLKCTL_36
 	str	r1, [r0]
 #endif

 #ifndef CONFIG_LPC2292
 	mov	ip, lr
 	/*
 	 * before relocating, we have to setup RAM timing
 	 * because memory timing is board-dependent, you will
 	 * find a lowlevel_init.S in your board directory.
 	 */
 	bl	lowlevel_init
 	mov	lr, ip
 #endif

 	mov	pc, lr


 /*
  *************************************************************************
  *
  * Interrupt handling
  *
  *************************************************************************
  */

 @
 @ IRQ stack frame.
 @
 #define S_FRAME_SIZE	72

 #define S_OLD_R0	68
 #define S_PSR		64
 #define S_PC		60
 #define S_LR		56
 #define S_SP		52

 #define S_IP		48
 #define S_FP		44
 #define S_R10		40
 #define S_R9		36
 #define S_R8		32
 #define S_R7		28
 #define S_R6		24
 #define S_R5		20
 #define S_R4		16
 #define S_R3		12
 #define S_R2		8
 #define S_R1		4
 #define S_R0		0

 #define MODE_SVC 0x13
 #define I_BIT	 0x80

 /*
  * use bad_save_user_regs for abort/prefetch/undef/swi ...
  * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
  */

 	.macro	bad_save_user_regs
 	sub	sp, sp, #S_FRAME_SIZE
 	stmia	sp, {r0 - r12}			@ Calling r0-r12
 	add	r8, sp, #S_PC

 	ldr	r2, IRQ_STACK_START_IN
 	ldmia	r2, {r2 - r4}			@ get pc, cpsr, old_r0
 	add	r0, sp, #S_FRAME_SIZE		@ restore sp_SVC

 	add	r5, sp, #S_SP
 	mov	r1, lr
 	stmia	r5, {r0 - r4}			@ save sp_SVC, lr_SVC, pc, cpsr, old_r
 	mov	r0, sp
 	.endm

 	.macro	irq_save_user_regs
 	sub	sp, sp, #S_FRAME_SIZE
 	stmia	sp, {r0 - r12}			@ Calling r0-r12
 	add	r8, sp, #S_PC
 	stmdb	r8, {sp, lr}^			@ Calling SP, LR
 	str	lr, [r8, #0]			@ Save calling PC
 	mrs	r6, spsr
 	str	r6, [r8, #4]			@ Save CPSR
 	str	r0, [r8, #8]			@ Save OLD_R0
 	mov	r0, sp
 	.endm

 	.macro	irq_restore_user_regs
 	ldmia	sp, {r0 - lr}^			@ Calling r0 - lr
 	mov	r0, r0
 	ldr	lr, [sp, #S_PC]			@ Get PC
 	add	sp, sp, #S_FRAME_SIZE
 	subs	pc, lr, #4			@ return & move spsr_svc into cpsr
 	.endm

 	.macro get_bad_stack
 	ldr	r13, IRQ_STACK_START_IN		@ setup our mode stack

 	str	lr, [r13]			@ save caller lr / spsr
 	mrs	lr, spsr
 	str	lr, [r13, #4]

 	mov	r13, #MODE_SVC			@ prepare SVC-Mode
 	msr	spsr_c, r13
 	mov	lr, pc
 	movs	pc, lr
 	.endm

 	.macro get_irq_stack			@ setup IRQ stack
 	ldr	sp, IRQ_STACK_START
 	.endm

 	.macro get_fiq_stack			@ setup FIQ stack
 	ldr	sp, FIQ_STACK_START
 	.endm

 /*
  * exception handlers
  */
 	.align	5
 undefined_instruction:
 	get_bad_stack
 	bad_save_user_regs
 	bl	do_undefined_instruction

 	.align	5
 software_interrupt:
 	get_bad_stack
 	bad_save_user_regs
 	bl	do_software_interrupt

 	.align	5
 prefetch_abort:
 	get_bad_stack
 	bad_save_user_regs
 	bl	do_prefetch_abort

 	.align	5
 data_abort:
 	get_bad_stack
 	bad_save_user_regs
 	bl	do_data_abort

 	.align	5
 not_used:
 	get_bad_stack
 	bad_save_user_regs
 	bl	do_not_used

 #ifdef CONFIG_USE_IRQ

 	.align	5
 irq:
 	get_irq_stack
 	irq_save_user_regs
 	bl	do_irq
 	irq_restore_user_regs

 	.align	5
 fiq:
 	get_fiq_stack
 	/* someone ought to write a more effiction fiq_save_user_regs */
 	irq_save_user_regs
 	bl	do_fiq
 	irq_restore_user_regs

 #else

 	.align	5
 irq:
 	get_bad_stack
 	bad_save_user_regs
 	bl	do_irq

 	.align	5
 fiq:
 	get_bad_stack
 	bad_save_user_regs
 	bl	do_fiq

 #endif

 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
 	.align	5
 .globl reset_cpu
 reset_cpu:
 	mov	ip, #0
 	mcr	p15, 0, ip, c7, c7, 0		@ invalidate cache
 	mcr	p15, 0, ip, c8, c7, 0		@ flush TLB (v4)
 	mrc	p15, 0, ip, c1, c0, 0		@ get ctrl register
 	bic	ip, ip, #0x000f			@ ............wcam
 	bic	ip, ip, #0x2100			@ ..v....s........
 	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
 	mov	pc, r0
 #elif defined(CONFIG_NETARM)
 	.align	5
 .globl reset_cpu
 reset_cpu:
 	ldr	r1, =NETARM_MEM_MODULE_BASE
 	ldr	r0, [r1, #+NETARM_MEM_CS0_BASE_ADDR]
 	ldr	r1, =0xFFFFF000
 	and	r0, r1, r0
 	ldr	r1, =(relocate-CONFIG_SYS_TEXT_BASE)
 	add	r0, r1, r0
 	ldr	r4, =NETARM_GEN_MODULE_BASE
 	ldr	r1, =NETARM_GEN_SW_SVC_RESETA
 	str	r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
 	ldr	r1, =NETARM_GEN_SW_SVC_RESETB
 	str	r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
 	ldr	r1, =NETARM_GEN_SW_SVC_RESETA
 	str	r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
 	ldr	r1, =NETARM_GEN_SW_SVC_RESETB
 	str	r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
 	mov	pc, r0
 #elif defined(CONFIG_S3C4510B)
 /* Nothing done here as reseting the CPU is board specific, depending
  * on external peripherals such as watchdog timers, etc. */
 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
 	/* No specific reset actions for IntegratorAP/CM720T as yet */
 #elif defined(CONFIG_LPC2292)
 	.align	5
 .globl reset_cpu
 reset_cpu:
 	mov	pc, r0
 #else
 #error No reset_cpu() defined for current CPU type
 #endif
	/*
	* armboot - Startup Code for ARM720 CPU-core
	*
	* Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
	* Copyright (c) 2002 Alex Züpke <azu@sysgo.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
	*/

	#include <asm-offsets.h>
	#include <config.h>
	#include <version.h>
	#include <asm/hardware.h>

	/*
	*************************************************************************
	*
	* Jump vector table as in table 3.1 in [1]
	*
	*************************************************************************
	*/


	.globl _start
	_start: b reset
	ldr pc, _undefined_instruction
	ldr pc, _software_interrupt
	ldr pc, _prefetch_abort
	ldr pc, _data_abort
	#ifdef CONFIG_LPC2292
	.word 0xB4405F76 /* 2's complement of the checksum of the vectors */
	#else
	ldr pc, _not_used
	#endif
	ldr pc, _irq
	ldr pc, _fiq

	_undefined_instruction: .word undefined_instruction
	_software_interrupt: .word software_interrupt
	_prefetch_abort: .word prefetch_abort
	_data_abort: .word data_abort
	_not_used: .word not_used
	_irq: .word irq
	_fiq: .word fiq

	.balignl 16,0xdeadbeef


	/*
	*************************************************************************
	*
	* Startup Code (reset vector)
	*
	* do important init only if we don't start from RAM!
	* relocate armboot to ram
	* setup stack
	* jump to second stage
	*
	*************************************************************************
	*/

	.globl _TEXT_BASE
	_TEXT_BASE:
	.word CONFIG_SYS_TEXT_BASE

	/*
	* These are defined in the board-specific linker script.
	* Subtracting _start from them lets the linker put their
	* relative position in the executable instead of leaving
	* them null.
	*/
	.globl _bss_start_ofs
	_bss_start_ofs:
	.word __bss_start - _start

	.globl _bss_end_ofs
	_bss_end_ofs:
	.word __bss_end__ - _start

	.globl _end_ofs
	_end_ofs:
	.word _end - _start

	#ifdef CONFIG_USE_IRQ
	/* IRQ stack memory (calculated at run-time) */
	.globl IRQ_STACK_START
	IRQ_STACK_START:
	.word 0x0badc0de

	/* IRQ stack memory (calculated at run-time) */
	.globl FIQ_STACK_START
	FIQ_STACK_START:
	.word 0x0badc0de
	#endif

	/* IRQ stack memory (calculated at run-time) + 8 bytes */
	.globl IRQ_STACK_START_IN
	IRQ_STACK_START_IN:
	.word 0x0badc0de

	/*
	* the actual reset code
	*/

	reset:
	/*
	* set the cpu to SVC32 mode
	*/
	mrs r0,cpsr
	bic r0,r0,#0x1f
	orr r0,r0,#0xd3
	msr cpsr,r0

	/*
	* we do sys-critical inits only at reboot,
	* not when booting from ram!
	*/
	#ifndef CONFIG_SKIP_LOWLEVEL_INIT
	bl cpu_init_crit
	#endif

	#ifdef CONFIG_LPC2292
	bl lowlevel_init
	#endif

	/* Set stackpointer in internal RAM to call board_init_f */
	call_board_init_f:
	ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
	bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
	ldr r0,=0x00000000
	bl board_init_f

	/------------------------------------------------------------------------------/

	/*
	* void relocate_code (addr_sp, gd, addr_moni)
	*
	* This "function" does not return, instead it continues in RAM
	* after relocating the monitor code.
	*
	*/
	.globl relocate_code
	relocate_code:
	mov r4, r0 /* save addr_sp */
	mov r5, r1 /* save addr of gd */
	mov r6, r2 /* save addr of destination */

	/* Set up the stack */
	stack_setup:
	mov sp, r4

	adr r0, _start
	cmp r0, r6
	beq clear_bss /* skip relocation */
	mov r1, r6 /* r1 <- scratch for copy_loop */
	ldr r3, _bss_start_ofs
	add r2, r0, r3 /* r2 <- source end address */

	copy_loop:
	ldmia r0!, {r9-r10} /* copy from source address [r0] */
	stmia r1!, {r9-r10} /* copy to target address [r1] */
	cmp r0, r2 /* until source end address [r2] */
	blo copy_loop

	#ifndef CONFIG_SPL_BUILD
	/*
	* fix .rel.dyn relocations
	*/
	ldr r0, _TEXT_BASE /* r0 <- Text base */
	sub r9, r6, r0 /* r9 <- relocation offset */
	ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */
	add r10, r10, r0 /* r10 <- sym table in FLASH */
	ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */
	add r2, r2, r0 /* r2 <- rel dyn start in FLASH */
	ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */
	add r3, r3, r0 /* r3 <- rel dyn end in FLASH */
	fixloop:
	ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */
	add r0, r0, r9 /* r0 <- location to fix up in RAM */
	ldr r1, [r2, #4]
	and r7, r1, #0xff
	cmp r7, #23 /* relative fixup? */
	beq fixrel
	cmp r7, #2 /* absolute fixup? */
	beq fixabs
	/* ignore unknown type of fixup */
	b fixnext
	fixabs:
	/* absolute fix: set location to (offset) symbol value */
	mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */
	add r1, r10, r1 /* r1 <- address of symbol in table */
	ldr r1, [r1, #4] /* r1 <- symbol value */
	add r1, r1, r9 /* r1 <- relocated sym addr */
	b fixnext
	fixrel:
	/* relative fix: increase location by offset */
	ldr r1, [r0]
	add r1, r1, r9
	fixnext:
	str r1, [r0]
	add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
	cmp r2, r3
	blo fixloop
	#endif

	clear_bss:
	#ifndef CONFIG_SPL_BUILD
	ldr r0, _bss_start_ofs
	ldr r1, _bss_end_ofs
	mov r4, r6 /* reloc addr */
	add r0, r0, r4
	add r1, r1, r4
	mov r2, #0x00000000 /* clear */

	clbss_l:str r2, [r0] /* clear loop... */
	add r0, r0, #4
	cmp r0, r1
	bne clbss_l

	bl coloured_LED_init
	bl red_LED_on
	#endif

	/*
	* We are done. Do not return, instead branch to second part of board
	* initialization, now running from RAM.
	*/
	ldr r0, _board_init_r_ofs
	adr r1, _start
	add lr, r0, r1
	add lr, lr, r9
	/* setup parameters for board_init_r */
	mov r0, r5 /* gd_t */
	mov r1, r6 /* dest_addr */
	/* jump to it ... */
	mov pc, lr

	_board_init_r_ofs:
	.word board_init_r - _start

	_rel_dyn_start_ofs:
	.word __rel_dyn_start - _start
	_rel_dyn_end_ofs:
	.word __rel_dyn_end - _start
	_dynsym_start_ofs:
	.word __dynsym_start - _start

	/*
	*************************************************************************
	*
	* CPU_init_critical registers
	*
	* setup important registers
	* setup memory timing
	*
	*************************************************************************
	*/

	#if defined(CONFIG_IMPA7) \|\| defined(CONFIG_EP7312) \|\| defined(CONFIG_ARMADILLO)

	/* Interrupt-Controller base addresses */
	INTMR1: .word 0x80000280 @ 32 bit size
	INTMR2: .word 0x80001280 @ 16 bit size
	INTMR3: .word 0x80002280 @ 8 bit size

	/* SYSCONs */
	SYSCON1: .word 0x80000100
	SYSCON2: .word 0x80001100
	SYSCON3: .word 0x80002200

	#define CLKCTL 0x6 /* mask */
	#define CLKCTL_18 0x0 /* 18.432 MHz */
	#define CLKCTL_36 0x2 /* 36.864 MHz */
	#define CLKCTL_49 0x4 /* 49.152 MHz */
	#define CLKCTL_73 0x6 /* 73.728 MHz */

	#elif defined(CONFIG_LPC2292)
	PLLCFG_ADR: .word PLLCFG
	PLLFEED_ADR: .word PLLFEED
	PLLCON_ADR: .word PLLCON
	PLLSTAT_ADR: .word PLLSTAT
	VPBDIV_ADR: .word VPBDIV
	MEMMAP_ADR: .word MEMMAP

	#endif

	cpu_init_crit:
	#if defined(CONFIG_IMPA7) \|\| defined(CONFIG_EP7312) \|\| defined(CONFIG_ARMADILLO)

	/*
	* mask all IRQs by clearing all bits in the INTMRs
	*/
	mov r1, #0x00
	ldr r0, INTMR1
	str r1, [r0]
	ldr r0, INTMR2
	str r1, [r0]
	ldr r0, INTMR3
	str r1, [r0]

	/*
	* flush v4 I/D caches
	*/
	mov r0, #0
	mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
	mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */

	/*
	* disable MMU stuff and caches
	*/
	mrc p15,0,r0,c1,c0
	bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
	bic r0, r0, #0x0000008f @ clear bits 7, 3:0 (B--- WCAM)
	orr r0, r0, #0x00000002 @ set bit 2 (A) Align
	mcr p15,0,r0,c1,c0
	#elif defined(CONFIG_NETARM)
	/*
	* prior to software reset : need to set pin PORTC4 to be *HRESET
	*/
	ldr r0, =NETARM_GEN_MODULE_BASE
	ldr r1, =(NETARM_GEN_PORT_MODE(0x10) \| \
	NETARM_GEN_PORT_DIR(0x10))
	str r1, [r0, #+NETARM_GEN_PORTC]
	/*
	* software reset : see HW Ref. Guide 8.2.4 : Software Service register
	* for an explanation of this process
	*/
	ldr r0, =NETARM_GEN_MODULE_BASE
	ldr r1, =NETARM_GEN_SW_SVC_RESETA
	str r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
	ldr r1, =NETARM_GEN_SW_SVC_RESETB
	str r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
	ldr r1, =NETARM_GEN_SW_SVC_RESETA
	str r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
	ldr r1, =NETARM_GEN_SW_SVC_RESETB
	str r1, [r0, #+NETARM_GEN_SOFTWARE_SERVICE]
	/*
	* setup PLL and System Config
	*/
	ldr r0, =NETARM_GEN_MODULE_BASE

	ldr r1, =( NETARM_GEN_SYS_CFG_LENDIAN \| \
	NETARM_GEN_SYS_CFG_BUSFULL \| \
	NETARM_GEN_SYS_CFG_USER_EN \| \
	NETARM_GEN_SYS_CFG_ALIGN_ABORT \| \
	NETARM_GEN_SYS_CFG_BUSARB_INT \| \
	NETARM_GEN_SYS_CFG_BUSMON_EN )

	str r1, [r0, #+NETARM_GEN_SYSTEM_CONTROL]

	#ifndef CONFIG_NETARM_PLL_BYPASS
	ldr r1, =( NETARM_GEN_PLL_CTL_PLLCNT(NETARM_PLL_COUNT_VAL) \| \
	NETARM_GEN_PLL_CTL_POLTST_DEF \| \
	NETARM_GEN_PLL_CTL_INDIV(1) \| \
	NETARM_GEN_PLL_CTL_ICP_DEF \| \
	NETARM_GEN_PLL_CTL_OUTDIV(2) )
	str r1, [r0, #+NETARM_GEN_PLL_CONTROL]
	#endif

	/*
	* mask all IRQs by clearing all bits in the INTMRs
	*/
	mov r1, #0
	ldr r0, =NETARM_GEN_MODULE_BASE
	str r1, [r0, #+NETARM_GEN_INTR_ENABLE]

	#elif defined(CONFIG_S3C4510B)

	/*
	* Mask off all IRQ sources
	*/
	ldr r1, =REG_INTMASK
	ldr r0, =0x3FFFFF
	str r0, [r1]

	/*
	* Disable Cache
	*/
	ldr r0, =REG_SYSCFG
	ldr r1, =0x83ffffa0 /* cache-disabled */
	str r1, [r0]

	#elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
	/* No specific initialisation for IntegratorAP/CM720T as yet */
	#elif defined(CONFIG_LPC2292)
	/* Set-up PLL */
	mov r3, #0xAA
	mov r4, #0x55
	/* First disconnect and disable the PLL */
	ldr r0, PLLCON_ADR
	mov r1, #0x00
	str r1, [r0]
	ldr r0, PLLFEED_ADR /* start feed sequence */
	str r3, [r0]
	str r4, [r0] /* feed sequence done */
	/* Set new M and P values */
	ldr r0, PLLCFG_ADR
	mov r1, #0x23 /* M=4 and P=2 */
	str r1, [r0]
	ldr r0, PLLFEED_ADR /* start feed sequence */
	str r3, [r0]
	str r4, [r0] /* feed sequence done */
	/* Then enable the PLL */
	ldr r0, PLLCON_ADR
	mov r1, #0x01 /* PLL enable bit */
	str r1, [r0]
	ldr r0, PLLFEED_ADR /* start feed sequence */
	str r3, [r0]
	str r4, [r0] /* feed sequence done */
	/* Wait for the lock */
	ldr r0, PLLSTAT_ADR
	mov r1, #0x400 /* lock bit */
	lock_loop:
	ldr r2, [r0]
	and r2, r1, r2
	cmp r2, #0
	beq lock_loop
	/* And finally connect the PLL */
	ldr r0, PLLCON_ADR
	mov r1, #0x03 /* PLL enable bit and connect bit */
	str r1, [r0]
	ldr r0, PLLFEED_ADR /* start feed sequence */
	str r3, [r0]
	str r4, [r0] /* feed sequence done */
	/* Set-up VPBDIV register */
	ldr r0, VPBDIV_ADR
	mov r1, #0x01 /* VPB clock is same as process clock */
	str r1, [r0]
	#else
	#error No cpu_init_crit() defined for current CPU type
	#endif

	#ifdef CONFIG_ARM7_REVD
	/* set clock speed */
	/* !!! we run @ 36 MHz due to a hardware flaw in Rev. D processors */
	/* !!! not doing DRAM refresh properly! */
	ldr r0, SYSCON3
	ldr r1, [r0]
	bic r1, r1, #CLKCTL
	orr r1, r1, #CLKCTL_36
	str r1, [r0]
	#endif

	#ifndef CONFIG_LPC2292
	mov ip, lr
	/*
	* before relocating, we have to setup RAM timing
	* because memory timing is board-dependent, you will
	* find a lowlevel_init.S in your board directory.
	*/
	bl lowlevel_init
	mov lr, ip
	#endif

	mov pc, lr


	/*
	*************************************************************************
	*
	* Interrupt handling
	*
	*************************************************************************
	*/

	@
	@ IRQ stack frame.
	@
	#define S_FRAME_SIZE 72

	#define S_OLD_R0 68
	#define S_PSR 64
	#define S_PC 60
	#define S_LR 56
	#define S_SP 52

	#define S_IP 48
	#define S_FP 44
	#define S_R10 40
	#define S_R9 36
	#define S_R8 32
	#define S_R7 28
	#define S_R6 24
	#define S_R5 20
	#define S_R4 16
	#define S_R3 12
	#define S_R2 8
	#define S_R1 4
	#define S_R0 0

	#define MODE_SVC 0x13
	#define I_BIT 0x80

	/*
	* use bad_save_user_regs for abort/prefetch/undef/swi ...
	* use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
	*/

	.macro bad_save_user_regs
	sub sp, sp, #S_FRAME_SIZE
	stmia sp, {r0 - r12} @ Calling r0-r12
	add r8, sp, #S_PC

	ldr r2, IRQ_STACK_START_IN
	ldmia r2, {r2 - r4} @ get pc, cpsr, old_r0
	add r0, sp, #S_FRAME_SIZE @ restore sp_SVC

	add r5, sp, #S_SP
	mov r1, lr
	stmia r5, {r0 - r4} @ save sp_SVC, lr_SVC, pc, cpsr, old_r
	mov r0, sp
	.endm

	.macro irq_save_user_regs
	sub sp, sp, #S_FRAME_SIZE
	stmia sp, {r0 - r12} @ Calling r0-r12
	add r8, sp, #S_PC
	stmdb r8, {sp, lr}^ @ Calling SP, LR
	str lr, [r8, #0] @ Save calling PC
	mrs r6, spsr
	str r6, [r8, #4] @ Save CPSR
	str r0, [r8, #8] @ Save OLD_R0
	mov r0, sp
	.endm

	.macro irq_restore_user_regs
	ldmia sp, {r0 - lr}^ @ Calling r0 - lr
	mov r0, r0
	ldr lr, [sp, #S_PC] @ Get PC
	add sp, sp, #S_FRAME_SIZE
	subs pc, lr, #4 @ return & move spsr_svc into cpsr
	.endm

	.macro get_bad_stack
	ldr r13, IRQ_STACK_START_IN @ setup our mode stack

	str lr, [r13] @ save caller lr / spsr
	mrs lr, spsr
	str lr, [r13, #4]

	mov r13, #MODE_SVC @ prepare SVC-Mode
	msr spsr_c, r13
	mov lr, pc
	movs pc, lr
	.endm

	.macro get_irq_stack @ setup IRQ stack
	ldr sp, IRQ_STACK_START
	.endm

	.macro get_fiq_stack @ setup FIQ stack
	ldr sp, FIQ_STACK_START
	.endm

	/*
	* exception handlers
	*/
	.align 5
	undefined_instruction:
	get_bad_stack
	bad_save_user_regs
	bl do_undefined_instruction

	.align 5
	software_interrupt:
	get_bad_stack
	bad_save_user_regs
	bl do_software_interrupt

	.align 5
	prefetch_abort:
	get_bad_stack
	bad_save_user_regs
	bl do_prefetch_abort

	.align 5
	data_abort:
	get_bad_stack
	bad_save_user_regs
	bl do_data_abort

	.align 5
	not_used:
	get_bad_stack
	bad_save_user_regs
	bl do_not_used

	#ifdef CONFIG_USE_IRQ

	.align 5
	irq:
	get_irq_stack
	irq_save_user_regs
	bl do_irq
	irq_restore_user_regs

	.align 5
	fiq:
	get_fiq_stack
	/* someone ought to write a more effiction fiq_save_user_regs */
	irq_save_user_regs
	bl do_fiq
	irq_restore_user_regs

	#else

	.align 5
	irq:
	get_bad_stack
	bad_save_user_regs
	bl do_irq

	.align 5
	fiq:
	get_bad_stack
	bad_save_user_regs
	bl do_fiq

	#endif

	#if defined(CONFIG_IMPA7) \|\| defined(CONFIG_EP7312) \|\| defined(CONFIG_ARMADILLO)
	.align 5
	.globl reset_cpu
	reset_cpu:
	mov ip, #0
	mcr p15, 0, ip, c7, c7, 0 @ invalidate cache
	mcr p15, 0, ip, c8, c7, 0 @ flush TLB (v4)
	mrc p15, 0, ip, c1, c0, 0 @ get ctrl register
	bic ip, ip, #0x000f @ ............wcam
	bic ip, ip, #0x2100 @ ..v....s........
	mcr p15, 0, ip, c1, c0, 0 @ ctrl register
	mov pc, r0
	#elif defined(CONFIG_NETARM)
	.align 5
	.globl reset_cpu
	reset_cpu:
	ldr r1, =NETARM_MEM_MODULE_BASE
	ldr r0, [r1, #+NETARM_MEM_CS0_BASE_ADDR]
	ldr r1, =0xFFFFF000
	and r0, r1, r0
	ldr r1, =(relocate-CONFIG_SYS_TEXT_BASE)
	add r0, r1, r0
	ldr r4, =NETARM_GEN_MODULE_BASE
	ldr r1, =NETARM_GEN_SW_SVC_RESETA
	str r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
	ldr r1, =NETARM_GEN_SW_SVC_RESETB
	str r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
	ldr r1, =NETARM_GEN_SW_SVC_RESETA
	str r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
	ldr r1, =NETARM_GEN_SW_SVC_RESETB
	str r1, [r4, #+NETARM_GEN_SOFTWARE_SERVICE]
	mov pc, r0
	#elif defined(CONFIG_S3C4510B)
	/* Nothing done here as reseting the CPU is board specific, depending
	* on external peripherals such as watchdog timers, etc. */
	#elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
	/* No specific reset actions for IntegratorAP/CM720T as yet */
	#elif defined(CONFIG_LPC2292)
	.align 5
	.globl reset_cpu
	reset_cpu:
	mov pc, r0
	#else
	#error No reset_cpu() defined for current CPU type
	#endif