u-boot2010.03 移植篇(三)-----进一步修改start.S,smdk6410.h,支持nand启动及配置DM9000网卡-电子工程世界

----------------------------------------------------------
使用环境
PC: Centos5.4

kernel: 3.0.1

corss: arm-linux-gcc 4.4.1

arm: s3c6410
uboot: uboot-2010-03
----------------------------------------------------------

第一处修改：

#ifndef CONFIG_NAND_SPL

* 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, 0

bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)

bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)

orr r0, r0, #0x00000002 @ set bit 2 (A) Align

orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache

mcr p15, 0, r0, c1, c0, 0//从后面拷贝过来的

///////////////////////////////以下的注释掉

/* Prepare to disable the MMU */

//adr r1, mmu_disable_phys

/* We presume we're within the first 1024 bytes */

//and r1, r1, #0x3fc

//ldr r2, _TEXT_PHY_BASE

//ldr r3, =0xfff00000

//and r2, r2, r3

//orr r2, r2, r1

//b mmu_disable

//.align 5

/* Run in a single cache-line */

//mmu_disable:

// mcr p15, 0, r0, c1, c0, 0

// nop

// mov pc, r2

////////////////////////////////////////////////////////////////////

第二处修改：

bl lowlevel_init /* go setup pll,mux,memory */ 之后

/* when we already run in ram, we don't need to relocate U-Boot.////////////////////////////////////////////////////////////////////

* and actually, memory controller must be configured before U-Boot

* is running in ram.

ldr r0, =0xff000fff

bic r1, pc, r0 /* r0 <- current base addr of code */

ldr r2, _TEXT_BASE /* r1 <- original base addr in ram */

bic r2, r2, r0 /* r0 <- current base addr of code */

cmp r1, r2 /* compare r0, r1 */

beq after_copy /* r0 == r1 then skip flash copy */

#ifdef CONFIG_BOOT_NAND

mov r0, #0x1000

bl copy_from_nand

#endif

after_copy:////////////////////////////////////////////////////////

#ifdef CONFIG_ENABLE_MMU

上面的修改是判断到底是从Nand Flash启动还是RAM启动；

1.如果是从nandflash中启动，那么PC的值一定在4K之内。那么执行完bicr1,pc,r0 之后，r1为0。_TEXT_BASE要么等于0x57e00000,要么等于0xC7e00000.那么执行完bicr2,r2,r0 之后，r2为0x00e00000，那么不相等，则不跳转，下面应该就是copy_from_nand。
2.如果是从ram中启动，那么PC的值为0xx7e00000。那么执行完bicr1,pc,r0 之后，r1为0x00e00000。_TEXT_BASE要么等于0x57e00000,要么等于0xC7e00000.那么执行完bicr2,r2,r0 之后，r2为0x00e00000，那么相等，跳转到after_copy，也就是不需要copy。承接上面分析，如果没有完成copy，则接下来就是copy_from_nand。

第三处修改：

#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:

之前加上以下语句

* copy U-Boot to SDRAM and jump to ram (from NAND or OneNAND)

* r0: size to be compared

* Load 1'st 2blocks to RAM because U-boot's size is larger than 1block(128k) size

*////////////////////////////////////////////////////////////////////////////////

.globl copy_from_nand

copy_from_nand:

mov r10, lr /* save return address */

mov r9, r0

/* get ready to call C functions */

ldr sp, _TEXT_PHY_BASE/* setup temp stack pointer */

sub sp, sp, #12

mov fp, #0 /* no previous frame, so fp=0 */

mov r9, #0x1000

bl copy_uboot_to_ram //此函数需要添加，稍后说明。

3: tst r0, #0x0

bne copy_failed

ldr r0, =0x0c000000

ldr r1, _TEXT_PHY_BASE

1: ldr r3, [r0], #4

ldr r4, [r1], #4

teq r3, r4

bne compare_failed/* not matched */

subs r9, r9, #4

bne 1b

4: mov lr, r10 /* all is OK */

mov pc, lr

copy_failed:

nop /* copy from nand failed */

b copy_failed

compare_failed:

nop /* compare failed */

b compare_failed

接着进入u-boot-2010.03/include/configs编辑smdk6410.h,添加下面的宏定义；

1	#definevirt_to_phys(x) virt_to_phy_smdk6410(x)

1	#defineCONFIG_SYS_PROMPT 'SMDK6410#' /MonitorCommandPrompt /

1	这里的”SMDK6410”可以自己修改，这就是你进入uboot的命令模式的#前面的文字。

1 2	//#definePHYS_SDRAM_1_SIZE 0x08000000 /128MBinBank#1 / #definePHYS_SDRAM_1_SIZE 0x10000000 /256MBinBank#1 /

1	修改SDRAM内存为256M的。

/*NANDconfiguration*/

#defineNAND_DISABLE_CE()(NFCONT_REG|= (1<<1))

#defineNAND_ENABLE_CE()(NFCONT_REG&=~(1<<1))

#defineNF_TRANSRnB() do{while(!(NFSTAT_REG&(1<<0)));}while(0)

1	这里的定义是后面写nand_cp.c要用到的宏定义

*Architecturemagicandmachinetype

//#define MACH_TYPE 1270/*smdk6400ID*/

#defineMACH_TYPE 1626/*smdk6410ID*/

6410的ID号；

*Sizeofmalloc()pool

//#define CONFIG_SYS_MALLOC_LEN (CONFIG_ENV_SIZE+1024*1024)

#defineCONFIG_SYS_MALLOC_LEN (CONFIG_ENV_SIZE+512*1024)

#defineCONFIG_SYS_GBL_DATA_SIZE 128 /*sizeinbytesforinitialdata*/

修改内存大小;

1	#defineCONFIG_BOOTDELAY 3

1	修改bootdelay延迟时间

//#define CONFIG_SYS_MEMTEST_END (CONFIG_SYS_SDRAM_BASE +0x7e00000)

/*126MBinDRAM*/

#defineCONFIG_SYS_MEMTEST_END (CONFIG_SYS_SDRAM_BASE +0x9e00000)

/*256MBinDRAM*/

1	修改SDROM大小；

/*the PWMTImer4usesacounterof15625for10ms,soweneed*/

/*ittowrap100times (total1562500)toget1sec.*/

//#define CONFIG_SYS_HZ 1000 //atPCLK50MHz

#defineCONFIG_SYS_HZ 1562500

时钟修改；

10.

1 2	//#define CONFIG_STACKSIZE 0x40000 /regularstack256KB/ #defineCONFIG_STACKSIZE 0x80000 /regularstack512KB/

堆栈大小修改；

11.

1 2	//#define PHYS_SDRAM_1_SIZE 0x08000000 /128MBinBank#1 / #definePHYS_SDRAM_1_SIZE0x10000000 /256MBinBank#1 /

1	Nand Flash每块大小修改；

12.

1 2	//#define CONFIG_ENV_SIZE 0x4000 /TotalSizeofEnvironmentSector/ #defineCONFIG_ENV_SIZE 0x80000 /TotalSizeofEnvironmentSector/

1	Total Size of Environment Sector修改；

13.

//#define CONFIG_BOOTCOMMAND 'nand read 0x50018000 0x60000 0x1c0000;'

//'bootm0x50018000'

#define CONFIG_BOOTCOMMAND 'nand read 0x50018000 0x100000 0x500000;'

'bootm0x50018000'

1	CONFIG_BOOTCOMMAND修改

14.

1	#defineCONFIG_ENV_OFFSET 0x0080000

1	CONFIG_ENV_OFFSET修改

15.

1 2	//#define CONFIG_SYS_NAND_PAGE_SIZE 2048 #defineCONFIG_SYS_NAND_PAGE_SIZE 4096

1	Nand Flash每一页大小的修改

16.

/*NANDchipblocksize */

//#define CONFIG_SYS_NAND_BLOCK_SIZE (128*1024)

#defineCONFIG_SYS_NAND_BLOCK_SIZE (512*1024)

1	Nand Flash每一块大小的修改

17.

/*NANDchippageperblockcount */

//#define CONFIG_SYS_NAND_PAGE_COUNT 64

#defineCONFIG_SYS_NAND_PAGE_COUNT 128

校验位修改

1	并将里面的所有6400除了（#define CONFIG_S3C6400 1）替换为6410

1	接下来在u-boot-2010.03/cpu/arm1176/下面新建一个nand_cp.c文件，代码如下：

#include

#ifdefCONFIG_S3C64XX

#include

staticintnandll_read_page(uchar*buf,ulongaddr,intlarge_block)

{

inti;

intpage_size=512;

/* 2K */

if(large_block==1)

page_size=2048;

/* 4K */

if(large_block==2)

page_size=4096;

NAND_ENABLE_CE();

NFCMD_REG=NAND_CMD_READ0;

/*WriteAddress*/

NFADDR_REG=0;

if(large_block)

NFADDR_REG=0;

NFADDR_REG=(addr)&0xff;

NFADDR_REG=(addr>>8)&0xff;

NFADDR_REG=(addr>>16)&0xff;

#defineNFCMD_REG

__REG(ELFIN_NAND_BASE+NFCMMD_OFFSET)

#defineELFIN_NAND_BASE 0x70200000

#defineNFCMMD_OFFSET 0x08

NFCMD_REG=(*( (volatileu32*) (0x70200008) ))

NFCMMD 0x70200008 NANDFlash命令设置寄存器0

#define NAND_CMD_READSTART 0x30

if(large_block)

NFCMD_REG=NAND_CMD_READSTART;

define NF_TRANSRnB()

do{ while( !( NFSTAT_REG&(1<<0) ) ); }while(0)

#define NFSTAT_REG

__REG(ELFIN_NAND_BASE+NFSTAT_OFFSET)

NFSTAT_REG=(*( (volatileu32*) (0x70200028) ))

NFSTAT 0x70200028 NANDFlash操作状态寄存器

NF_TRANSRnB();

/*forcompatibility(2460).u32cannotbeused.byscsuh*/

for(i=0;i

{

*buf++=NFDATA8_REG;

}

#defineNAND_DISABLE_CE()(NFCONT_REG|= (1<<1))

#defineNFCONT_REG

__REG(ELFIN_NAND_BASE+NFCONT_OFFSET)

#define__REG(x) (*((volatileu32*)(x)))

#defineELFIN_NAND_BASE 0x70200000

#defineNFCONT_OFFSET 0x04

NAND_DISABLE_CE();

return0;

}

staticintnandll_read_blocks(ulongdst_addr,ulongsize,int large_block)

{

uchar*buf=(uchar*)dst_addr;

inti;

uintpage_shift=9;

if(large_block==1)

page_shift=11;

/*Readpages*/

if(large_block==2)

page_shift=12;

if(large_block==2)

{

/*Readpages*/

for(i=0;i<4;i++,buf+=(1<<(page_shift-1)))

{

nandll_read_page(buf,i,large_block);

}

/*Readpages*/

/* 0x3c000 = 111100000000000000 */

for(i=4;i<(0x3c000>>page_shift);i++,buf+=(1<

{

nandll_read_page(buf,i,large_block);

}

else

{

for(i=0;i<(0x3c000>>page_shift);i++,buf+=(1<

{

nandll_read_page(buf,i,large_block);

}

return0;

}

intcopy_uboot_to_ram(void)

{

intlarge_block =0;

inti;

vu_charid;

#defineNAND_ENABLE_CE() (NFCONT_REG&=~(1<<1))

#defineNFCONT_REG

__REG(ELFIN_NAND_BASE+NFCONT_OFFSET)

#define__REG(x) (*((volatileu32*)(x)))

#defineELFIN_NAND_BASE 0x70200000

#defineNFCONT_OFFSET 0x04

NFCONT_REG=(*( (volatileu32*) (0x70200004) ))

NFCONT0x70200004 读/写NANDFlash控制寄存器

[0]1：NANDFlash控制器使能

NAND_ENABLE_CE();

#defineNFCMD_REG

__REG(ELFIN_NAND_BASE+NFCMMD_OFFSET)

#defineELFIN_NAND_BASE 0x70200000

#defineNFCMMD_OFFSET 0x08

NFCMD_REG=(*( (volatileu32*) (0x70200008) ))

NFCMMD 0x70200008 NANDFlash命令设置寄存器0

#defineNAND_CMD_READID 0x90

NFCMD_REG=NAND_CMD_READID;

#defineNFADDR_REG

__REG(ELFIN_NAND_BASE+NFADDR_OFFSET)

#defineELFIN_NAND_BASE 0x70200000

#defineNFADDR_OFFSET 0x0C

NFADDR_REG =(*( (volatileu32*) (0x7020000C) ))

NFADDR0x7020000C NANDFlash地址设置寄存器

NFADDR_REG= 0x00;

#define NFDATA8_REG

__REGb(ELFIN_NAND_BASE+NFDATA_OFFSET)

#define__REGb(x) (*(vu_char*)(x))

NFDATA8_REG = (*( (vu_char*) (0x70200010) ))

NFDATA0x70200010 读/写NANDFlash数据寄存器

NANDFlash 读/烧写数据值用于I/O

/*waitforawhile*/

for(i=0;i<200;i++);

id=NFDATA8_REG;

if(id>0x80)

large_block=1;

if(id ==0xd5)

large_block=2;

/*readNANDBlock.

*128KB->240KBbecauseofU-Bootsizeincrease.byscsuh

*So,read0x3c000bytesnot0x20000(128KB).

#define CONFIG_SYS_PHY_UBOOT_BASE

(CONFIG_SYS_SDRAM_BASE+0x07e00000)

#define CONFIG_SYS_SDRAM_BASE 0x50000000

CONFIG_SYS_PHY_UBOOT_BASE= 0x57e00000

0x3c000 = 1M

returnnandll_read_blocks(CONFIG_SYS_PHY_UBOOT_BASE,0x3c000,large_block);

}

#endif

1	修改u-boot-2010.03/cpu/arm1176/Makefile，在COBJS = cpu.o后面加nand_cp.o

1	COBJS = cpu.o nand_cp.o

1	修改u-boot-2010.03/board/samsung/smdk6410/u-boot-nand.lds，添加nand_cp.o 如下：

{

cpu/arm1176/start.o (.text)

cpu/arm1176/s3c64xx/cpu_init.o (.text)

board/samsung/smdk6410/lowlevel_init.o (.text)

cpu/arm1176/nand_cp.o(.text)

lib_arm/board.o (.text)

*(.text)

}

[1] [2] [3]

关键字：u-boot start nand启动引用地址：u-boot2010.03 移植篇(三)-----进一步修改start.S,smdk6410.h,支持nand启动及配置DM9000网卡

上一篇：u-boot2010.03 移植篇(二)-----修改start.S,支持nand启动
下一篇：u-boot2010.03 配置编译目标分析

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