u-boot-2012-07移植四

经过半个月的实习终于有时间再把这个半成品搞一搞了。通过今天的调试u-boot终于有输出了，以下是调试过程：

一，修改start . S，这里我没有删除源码中任何一行代码，只是把要删除的注释掉了，大家看的时候要仔细了

/*
 *  armboot - Startup Code for ARM1176 CPU-core
 *
 * Copyright (c) 2007	Samsung Electronics
 *
 * Copyright (C) 2008
 * Guennadi Liakhovetki,DENX Software Engineering,<lg@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
 *
 * 2007-09-21 - Restructured codes by jsgood (jsgood.yang@samsung.com)
 * 2007-09-21 - Added MoviNAND and OneNAND boot codes by
 * jsgood (jsgood.yang@samsung.com)
 * Base codes by scsuh (sc.suh)
 */

#include <asm-offsets.h>
#include <config.h>
#include <version.h>
#ifdef CONFIG_ENABLE_MMU
#include <asm/proc/domain.h>
#endif

#if !defined(CONFIG_ENABLE_MMU) && !defined(CONFIG_SYS_PHY_UBOOT_BASE)
#define CONFIG_SYS_PHY_UBOOT_BASE	CONFIG_SYS_UBOOT_BASE
#endif

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

.globl _start
_start: b	reset
#ifndef CONFIG_NAND_SPL
	ldr	pc,_undefined_instruction
	ldr	pc,_software_interrupt
	ldr	pc,_prefetch_abort
	ldr	pc,_data_abort
	ldr	pc,_not_used
	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
_pad:
	.word 0x12345678 /* now 16*4=64 */
#else
	. = _start + 64
#endif

.global _end_vect
_end_vect:
	.balignl 16,0xdeadbeef
/*
 *************************************************************************
 *
 * Startup Code (reset vector)
 *
 * do important init only if we don't start from memory!
 * setup Memory and board specific bits prior to relocation.
 * relocate armboot to ram
 * setup stack
 *
 *************************************************************************
 */

.globl _TEXT_BASE
_TEXT_BASE:
	.word	CONFIG_SYS_TEXT_BASE

/*
 * Below variable is very important because we use MMU in U-Boot.
 * Without it,we cannot run code correctly before MMU is ON.
 * by scsuh.
 */
_TEXT_PHY_BASE:
	.word	CONFIG_SYS_PHY_UBOOT_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

/* 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,#0x3f
	orr	r0,#0xd3
	msr	cpsr,r0

/*
 *************************************************************************
 *
 * CPU_init_critical registers
 *
 * setup important registers
 * setup memory timing
 *
 *************************************************************************
 */
	/*
	 * we do sys-critical inits only at reboot,* not when booting from ram!
	 */
cpu_init_crit:
	/*
	 * When booting from NAND - it has definitely been a reset,so,no need
	 * to flush caches and disable the MMU
	 */
#ifndef CONFIG_NAND_SPL
	/*
	 * flush v4 I/D caches
	 */
	mov	r0,#0
	mcr	p15,c7,0	/* flush v3/v4 cache */
	mcr	p15,c8,0	/* flush v4 TLB */

	/*
	 * disable MMU stuff and caches
	 */
	mrc	p15,c1,c0,0
	bic	r0,#0x00002300	@ clear bits 13,9:8 (--V- --RS)
	bic	r0,#0x00000087	@ clear bits 7,2:0 (B--- -CAM)
	orr	r0,#0x00000002	@ set bit 2 (A) Align
	orr	r0,#0x00001000	@ set bit 12 (I) I-Cache

	/* Prepare to disable the MMU */
	adr	r2,mmu_disable_phys
	sub	r2,r2,#(CONFIG_SYS_PHY_UBOOT_BASE - CONFIG_SYS_TEXT_BASE)
	b	mmu_disable

	.align 5
	/* Run in a single cache-line */
mmu_disable:
	mcr	p15,0
	nop
	nop
	mov	pc,r2
mmu_disable_phys:

#ifdef CONFIG_DISABLE_TCM
	/*
	 * Disable the TCMs
	 */
	mrc	p15,2	/* Return TCM details */
	cmp	r0,#0
	beq	skip_tcmdisable
	mov	r1,#0
	mov	r2,#1
	tst	r0,r2
	mcrne	p15,r1,c9,1	/* Disable Instruction TCM if present*/
	tst	r0,LSL #16
	mcrne	p15,0	/* Disable Data TCM if present*/
skip_tcmdisable:
#endif
#endif

#ifdef CONFIG_PERIPORT_REMAP
	/* Peri port setup */
	ldr	r0,=CONFIG_PERIPORT_BASE
	orr	r0,#CONFIG_PERIPORT_SIZE
	mcr	p15,c15,c2,4
#endif

	/*
	 * Go setup Memory and board specific bits prior to relocation.
	 */
	bl	lowlevel_init		/* go setup pll,mux,memory */

/* 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:
#ifndef CONFIG_NAND_SPL	
	mov	sp,#(1024*8)
	mov r0,#0
	ldr r1,=_start
	ldr r2,_bss_end_ofs
	bl  copy_to_ddr
#endif

/*	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,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,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,r9		/* r0 <- location to fix up in RAM */
/*	ldr	r1,[r2,#4]
	and	r7,#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,LSR #4		/* r1 <- symbol index in .dynsym */
/*	add	r1,r1		/* r1 <- address of symbol in table */
/*	ldr	r1,[r1,#4]		/* r1 <- symbol value */
/*	add	r1,r9		/* r1 <- relocated sym addr */
/*	b	fixnext
fixrel:
	/* relative fix: increase location by offset */
/*	ldr	r1,[r0]
	add	r1,r9
fixnext:
	str	r1,[r0]
	add	r2,#8		/* each rel.dyn entry is 8 bytes */
/*	cmp	r2,r3
	blo	fixloop
#endif

#ifdef CONFIG_ENABLE_MMU
enable_mmu:
	/* enable domain access */
/*	ldr	r5,=0x0000ffff
	mcr	p15,r5,c3,0	/* load domain access register */

	/* Set the TTB register */
/*	ldr	r0,_mmu_table_base
	ldr	r1,=CONFIG_SYS_PHY_UBOOT_BASE
	ldr	r2,=0xfff00000
	bic	r0,r2
	orr	r1,r1
	mcr	p15,0

	/* Enable the MMU */
/*	mrc	p15,0
	orr	r0,#1		/* Set CR_M to enable MMU */

	/* Prepare to enable the MMU */
/*	adr	r1,skip_hw_init
	and	r1,#0x3fc
	ldr	r2,_TEXT_BASE
	ldr	r3,=0xfff00000
	and	r2,r3
	orr	r2,r1
	b	mmu_enable

	.align 5
	/* Run in a single cache-line */
/*mmu_enable:

	mcr	p15,r2
skip_hw_init:
#endif        */

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

clbss_l:cmp	r0,r1			/* clear loop... */
	bhs	clbss_e			/* if reached end of bss,exit */
	str	r2,[r0]
	add	r0,#4
	b	clbss_l
clbss_e:
/*#ifndef CONFIG_NAND_SPL
	bl coloured_LED_init
	bl red_led_on
#endif   */
#endif

/*
 * We are done. Do not return,instead branch to second part of board
 * initialization,now running from RAM.
 */
#ifdef CONFIG_NAND_SPL
	ldr     pc,_nand_boot

_nand_boot: .word nand_boot
#else
/*	ldr	r0,_board_init_r_ofs
	adr	r1,_start
	add	lr,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   */
	ldr sp,=0x60000000
	ldr pc,=run_in_ddr
run_in_ddr:
	
	mov r0,#0	
	bl board_init_f  /* 单板相关的初始化,比如初始化串口 */
#endif

_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

#ifdef CONFIG_ENABLE_MMU
_mmu_table_base:
	.word mmu_table
#endif

#ifndef CONFIG_NAND_SPL
/*
 * we assume that cache operation is done before. (eg. cleanup_before_linux())
 * actually,we don't need to do anything about cache if not use d-cache in
 * U-Boot. So,in this function we clean only MMU. by scsuh
 *
 * void	theLastJump(void *kernel,int arch_num,uint boot_params);
 */
#ifdef CONFIG_ENABLE_MMU
	.globl theLastJump
theLastJump:
	mov	r9,r0
	ldr	r3,=0xfff00000
	ldr	r4,_TEXT_PHY_BASE
	adr	r5,phy_last_jump
	bic	r5,r3
	orr	r5,r4
	mov	pc,r5
phy_last_jump:
	/*
	 * disable MMU stuff
	 */
	mrc	p15,#0x00002300	/* clear bits 13,9:8 (--V- --RS) */
	bic	r0,#0x00000087	/* clear bits 7,2:0 (B--- -CAM) */
	orr	r0,#0x00000002	/* set bit 2 (A) Align */
	orr	r0,#0x00001000	/* set bit 12 (I) I-Cache */
	mcr	p15,0

	mcr	p15,0	/* flush v4 TLB */

	mov	r0,#0
	mov	pc,r9
#endif


/*
 *************************************************************************
 *
 * 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 ...
 */

	.macro	bad_save_user_regs
	/* carve out a frame on current user stack */
	sub	sp,#S_FRAME_SIZE
	/* Save user registers (now in svc mode) r0-r12 */
	stmia	sp,{r0 - r12}

	ldr	r2,IRQ_STACK_START_IN
	/* get values for "aborted" pc and cpsr (into parm regs) */
	ldmia	r2,{r2 - r3}
	/* grab pointer to old stack */
	add	r0,#S_FRAME_SIZE

	add	r5,#S_SP
	mov	r1,lr
	/* save sp_SVC,lr_SVC,pc,cpsr */
	stmia	r5,{r0 - r3}
	/* save current stack into r0 (param register) */
	mov	r0,sp
	.endm

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

	/* save caller lr in position 0 of saved stack */
	str	lr,[r13]
	/* get the spsr */
	mrs	lr,spsr
	/* save spsr in position 1 of saved stack */
	str	lr,[r13,#4]

	/* prepare SVC-Mode */
	mov	r13,#MODE_SVC
	@ msr	spsr_c,r13
	/* switch modes,make sure moves will execute */
	msr	spsr,r13
	/* capture return pc */
	mov	lr,pc
	/* jump to next instruction & switch modes. */
	movs	pc,lr
	.endm

	.macro get_bad_stack_swi
	/* space on current stack for scratch reg. */
	sub	r13,r13,#4
	/* save R0's value. */
	str	r0,[r13]
	ldr	r13,IRQ_STACK_START_IN		@ setup our mode stack
	/* save caller lr in position 0 of saved stack */
	str	lr,[r0]
	/* get the spsr */
	mrs	r0,[r0,#4]
	/* restore r0 */
	ldr	r0,[r13]
	/* pop stack entry */
	add	r13,#4
	.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_swi
	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

	.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 /* CONFIG_NAND_SPL */

二，在arch/arm/cpu/arm1176中添加nand拷贝文件nand_copy.c，并修改相应的makefile

#define MEM_SYS_CFG     (*((volatile unsigned long *)0x7E00F120))
#define NFCONF          (*((volatile unsigned long *)0x70200000))
#define NFCONT          (*((volatile unsigned long *)0x70200004))
#define NFCMD           (*((volatile unsigned long *)0x70200008))
#define NFADDR          (*((volatile unsigned long *)0x7020000C))
#define NFDATA          (*((volatile unsigned char *)0x70200010))
#define NFSTAT          (*((volatile unsigned long *)0x70200028))

#define NAND_ENABLE() 	    NFCONT &= ~(1<<1)
#define NAND_DISABLE()      NFCONT |=  (1<<1)
#define NAND_CMD(x)         NFCMD = (x)
#define NAND_ADDR(x)	 	NFADDR= (x)
#define NAND_GET_DATA()  	NFDATA
#define NAND_PUT_DATA(x) 	NFDATA = (x)
#define NAND_WAIT()	while((NFSTAT & 0x01) == 0)

#define TACLS     0
#define TWRPH0    2
#define TWRPH1    2

void cp_nand_reset(void)
{
	NAND_ENABLE();
	NAND_CMD(0xff);
	NAND_WAIT();
	NAND_DISABLE();
}

void cp_nand_init(void)
{
	MEM_SYS_CFG &= ~(1<<1);
	NFCONF &= ~((1<<30) | (7<<12) | (7<<8) | (7<<4));
	NFCONF |= ((TACLS<<12) | (TWRPH0<<8) | (TWRPH1<<4));

	/* 使能nand flash controller */
	NFCONT |= 1;
	NFCONT &= ~(1<<16); /* 森止soft lock */

	cp_nand_reset();
}

void cp_nand_send_addr(unsigned int addr)
{
#if 0	
		unsigned int page	= addr / 4096;
		unsigned int colunm = addr & (4096 - 1);
	
		/* 这两个地址表示从页内哪里开始 */
		NAND_ADDR(colunm & 0xff);
		NAND_ADDR((colunm >> 8) & 0xff);
	
		/* 下面三个地址表示哪一页 */
		NAND_ADDR(page & 0xff);
		NAND_ADDR((page >> 8) & 0xff);
		NAND_ADDR((page >> 16) & 0xff);
#else
		NAND_ADDR(addr & 0xff); 		/* a0~a7 */
		NAND_ADDR((addr >> 8) & 0x0f);	/* 程序的角度: a8~a11 */
		
		NAND_ADDR((addr >> 12) & 0xff); /* 程序的角度: a12~a19 */
		NAND_ADDR((addr >> 20) & 0xff); /* 程序的角度: a20~a27 */
		NAND_ADDR((addr >> 28) & 0x7);	/* 程序的角度: a28	 ~ */

		
#endif

}

void cp_nand_read(unsigned int nand_start,unsigned int ddr_start,unsigned int len)
{
	unsigned int addr = nand_start;
	int i = nand_start % 4096;
	int count = 0;
	unsigned char *dest = (unsigned char *)ddr_start;
	NAND_ENABLE();
	while(count < len)
		{
			NAND_CMD(0x00);
			cp_nand_send_addr(addr);
			NAND_CMD(0x30);
			NAND_WAIT();

			for(i = 0; i < 4096 && count < len; i++)
				{
					if(addr < 1024*16)
						{
						  	if(i < 1024*2)
							dest[count++] = NAND_GET_DATA();
							
						}
					else
						{
							dest[count++] = NAND_GET_DATA();
						}
					addr++;
				}
		}
	NAND_DISABLE();
}

void copy_to_ddr(unsigned int nand_start,unsigned int len)
{
	cp_nand_init();
	cp_nand_read(nand_start,ddr_start,len);
}

三，修改boad.c文件，这个文件只要修改两个函数里面的内容，我就直接把补丁文件给大家看看吧

diff -urN myuboot/u-boot-2012.07/arch/arm/lib/board.c LQuboot/u-boot-2012.07/arch/arm/lib/board.c
--- myuboot/u-boot-2012.07/arch/arm/lib/board.c	2012-07-31 02:24:37.000000000 +0800
+++ LQuboot/u-boot-2012.07/arch/arm/lib/board.c	2012-09-01 20:53:11.000000000 +0800
@@ -52,6 +52,7 @@
 #include <fdtdec.h>
 #include <post.h>
 #include <logbuff.h>
+#include <asm/arch/s3c6400.h>
 
 #ifdef CONFIG_BITBANGMII
 #include <miiphy.h>
@@ -272,6 +273,10 @@
 	ulong reg;
 #endif
 
+	GPMCON_REG = 0x1111;
+	GPMPUD_REG = 0x55;
+	GPMDAT_REG = 0x0;
+
 	bootstage_mark_name(BOOTSTAGE_ID_START_UBOOT_F,"board_init_f");
 
 	/* Pointer is writable since we allocated a register for it */
@@ -307,6 +312,7 @@
 	}
 #endif
 
+
 	debug("monitor len: %08lXn",gd->mon_len);
 	/*
 	 * Ram is setup,size stored in gd !!
@@ -326,6 +332,7 @@
 	gd->ram_size -= CONFIG_SYS_MEM_TOP_HIDE;
 #endif
 
+
 	addr = CONFIG_SYS_SDRAM_BASE + gd->ram_size;
 
 #ifdef CONFIG_LOGBUFFER
@@ -350,6 +357,7 @@
 	/* reserve TLB table */
 	addr -= (4096 * 4);
 
+
 	/* round down to next 64 kB limit */
 	addr &= ~(0x10000 - 1);
 
@@ -357,6 +365,7 @@
 	debug("TLB table at: %08lxn",addr);
 #endif
 
+
 	/* round down to next 4 kB limit */
 	addr &= ~(4096 - 1);
 	debug("Top of RAM usable for U-Boot at: %08lxn",addr);
@@ -378,6 +387,7 @@
 	addr -= gd->mon_len;
 	addr &= ~(4096 - 1);
 
+
 	debug("Reserving %ldk for U-Boot at: %08lxn",gd->mon_len >> 10,addr);
 
 #ifndef CONFIG_SPL_BUILD
@@ -401,6 +411,7 @@
 	gd->bd->bi_arch_number = CONFIG_MACH_TYPE; /* board id for Linux */
 #endif
 
+
 	addr_sp -= sizeof (gd_t);
 	id = (gd_t *) addr_sp;
 	debug("Reserving %zu Bytes for Global Data at: %08lxn",@@ -422,6 +433,8 @@
 	addr_sp += 128;	/* leave 32 words for abort-stack   */
 	gd->irq_sp = addr_sp;
 #endif
+	
+
 
 	debug("New Stack Pointer is: %08lxn",addr_sp);
 
@@ -437,13 +450,20 @@
 
 	gd->relocaddr = addr;
 	gd->start_addr_sp = addr_sp;
-	gd->reloc_off = addr - _TEXT_BASE;
+	gd->reloc_off = addr - _TEXT_BASE;	
+
 	debug("relocation Offset is: %08lxn",gd->reloc_off);
+
 	memcpy(id,(void *)gd,sizeof(gd_t));
 
-	relocate_code(addr_sp,id,addr);
+	GPMDAT_REG = 0x9;
+

+	//relocate_code(addr_sp,addr);
 
 	/* NOTREACHED - relocate_code() does not return */
+	void board_init_r(gd_t *id,ulong dest_addr);
+	board_init_r(id,addr);
 }
 
 #if !defined(CONFIG_SYS_NO_FLASH)
@@ -468,6 +488,8 @@
 	ulong flash_size;
 #endif
 
+	GPMDAT_REG = 0x7;
+
 	gd = id;
 
 	gd->flags |= GD_FLG_RELOC;	/* tell others: relocation done */
@@ -535,7 +557,7 @@
 # endif /* CONFIG_SYS_FLASH_CHECKSUM */
 	} else {
 		puts(failed);
-		hang();
+		//hang();
 	}
 #endif
 
@@ -648,6 +670,7 @@
 
 	/* main_loop() can return to retry autoboot,if so just run it again. */
 	for (;;) {
+		puts("here");
 		main_loop();
 	}

最后打印的结果如下：

U-Boot 2012.07 (Sep 16 2012 - 22:46:00) for SMDK6410


CPU:     S3C6410@533MHz
         Fclk = 533MHz,Hclk = 133MHz,Pclk = 66MHz (ASYNC Mode) 
Board:   SMDK6410
DRAM:  128 MiB
WARNING: Caches not enabled
Flash: *** failed ***
NAND:  No oob scheme defined for oobsize 218
2048 MiB
*** Warning - bad CRC,using default environment

In:    serial
Out:   serial
Err:   serial
Net:   CS8900-0
Hit any key to stop autoboot:  0 
SMDK6410 # print
Unknown command 'print' - try 'help'

可以看出u-boot的问题还很多，需要继续调试。