一. 準(zhǔn)備工作

1. 軟硬件

主 機(jī)：VMWare--ubuntu 10.10

開發(fā)板：TQ2440--128MB Nand, Kernel:3.4.0

編譯器：EABI-4.3.3_EmbedSky_20091210.tar.bz2

u-boot：u-boot-2012.07.tar.bz2

2. 工具鏈,解壓EABI-4.3.3_EmbedSky_20091210.tar.bz2到/opt目錄

root@ubuntu:~/uboot# ls /opt/EmbedSky/

4.3.3/ crosstools_3.4.5_softfloat/

3.這次移植是以smdk2410為模版,所以首先要?jiǎng)h除多余的目錄

//a.刪除arch下除arm以外的所有目錄

root@ubuntu:~/uboot/u-boot-2012.07/arch# find . -maxdepth 1 -type d | grep -v arm | xargs rm -rf

//b.arm/cpu下除arm920t以外的所有目錄

root@ubuntu:~/uboot/u-boot-2012.07/arch/arm/cpu# find . -maxdepth 1 -type d | grep -v arm920t |xargs rm -rf

//c.arch/arm/cpu/arm920t 錄下除s3c24x0以外的所有目錄

root@ubuntu:~/uboot/u-boot-2012.07/arch/arm/cpu/arm920t# find . -maxdepth 1 -type d | grep -v s3c24x0 | xargs rm -rf

//d.arch/arm/include/asm下除arch-s3c24x0以外的所有arch-xxxx,proc目錄不能刪

root@ubuntu:~/uboot/u-boot-2012.07/include/asm# find . -maxdepth 1 -type d | grep -v arch-s3c24x0 | grep -v proc | xargs rm -rf

//e.刪除include/configs目錄下除smdk2410.h文件以外的所有頭文件

root@ubuntu:~/uboot/u-boot-2012.07/include/configs# ls | grep -v smdk2410.h | xargs rm -rf

//f.去掉board下多余的目錄

root@ubuntu:~/uboot/u-boot-2012.07/board# find . -maxdepth 1 -type d | grep -v samsung | xargs rm -rf

root@ubuntu:~/uboot/u-boot-2012.07/board/samsung# find . -maxdepth 1 -type d | grep -v smdk2410 | xargs rm -rf

4. 生成內(nèi)存可運(yùn)行的u-boot

a. 修改Makefile

1. 156 ifeq($(HOSTARCH),$(ARCH))
   

2. 157 CROSS_COMPILE?=
   

3. 158 endif
   

4. 159
   

5. 160CROSS_COMPILE ?= /opt/EmbedSky/crosstools_3.4.5_softfloat/gcc-3.4.5-glibc-2.3.6/arm-linux/bin/arm-linux-

b. 修改鏈接地址 board/samsung/smdk2410/config.mk

1. #燒到板子上TEXT_BASE=0x33d80000

2. 25 TEXT_BASE = 0x33d80000
   

3. #仿真器調(diào)試TEXT_BASE=0x33000000

4. 26 #TEXT_BASE = 0x33000000

5. #為什么要選這個(gè)呢? 因其只要在內(nèi)存中就可以了,但是因?yàn)門Q2440有一個(gè)選項(xiàng)

6. [7] Download Program (uCOS-II or TQ2440_Test) to SDRAM and Run it

7. 寫到內(nèi)存的0x33000000并運(yùn)行,這樣編出u-boot.bin后,直接寫到內(nèi)存就可以運(yùn)行了,非常方便.

c.編譯,直接用smdk2410的,比較省事

1. make smdk2410_config
   

2. make

二. 可以從nand_flash啟動(dòng)的u-boot

2.1 初始化內(nèi)存

修改board/samsung/smdk2410/lowlevel_init.S

L54 #define B1_BWSCON (DW32) > #define B1_BWSCON (DW16)

L58#define B5_BWSCON (DW16)> #define B5_BWSCON (DW8)

L126#define REFCNT 1113 > #define REFCNT 0x4F4

2.2 初始化clock_controler ,并將u-boot代碼復(fù)制到TEXT_BASE處

修改 arch/arm/cpu/arm920t/start.S

/*注掉這一段*/

#if 0

/* FCLK:HCLK:PCLK = 1:2:4 */

/* default FCLK is 120 MHz ! */

ldr r0, =CLKDIVN

mov r1, #3

str r1, [r0]

#endif

#endif /* CONFIG_S3C24X0 */

/*

* we do sys-critical inits only at reboot,

* not when booting from ram!

*/

#ifndef CONFIG_SKIP_LOWLEVEL_INIT

#if 1

bl cpu_init_crit

#endif

#endif

/*把棧初始化提前,因?yàn)橄旅嬉{(diào)用C函數(shù)*/

/* Set up the stack */

stack_setup:

ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */

sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area */

sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo */

#ifdef CONFIG_USE_IRQ

sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)

#endif

sub sp, r0, #12 /* leave 3 words for abort-stack */

bl clock_init /*調(diào)用clock_init,初始化clock*/

bl my_nand_init /*調(diào)用my_nand_init,進(jìn)行nand flash初始化*/

#ifndef CONFIG_SKIP_RELOCATE_UBOOT

relocate: /* relocate U-Boot to RAM */

adr r0, _start /* r0 <- current position of code */

ldr r1, _TEXT_BASE /* test if we run from flash or RAM */

cmp r0, r1 /* don't reloc during debug */

beq clear_bss

ldr r2, _armboot_start

ldr r3, _bss_start

sub r2, r3, r2 /* r2 <- size of armboot */

#if 1

bl my_nand_read_page /*調(diào)用my_nand_read_page,將u-boot從nand復(fù)制到TEXT_BASE處*/

#else

add r2, r0, r2 /* r2 <- source end address */

copy_loop:

ldmia r0!, {r3-r10} /* copy from source address [r0] */

stmia r1!, {r3-r10} /* copy to target address [r1] */

cmp r0, r2 /* until source end addreee [r2] */

ble copy_loop

#endif

#endif /* CONFIG_SKIP_RELOCATE_UBOOT */

2.3

a. 在board/samsung/smdk2410目錄下建文件boot_init.c,完成初始化clock_controler ,并將u-boot代碼復(fù)制到TEXT_BASE處的實(shí)際操作

b. 在arch/arm/include/asm/arch-s3c24x0/s3c24x0.h中

struct s3c24x0_clock_power {

u32 LOCKTIME;

u32 MPLLCON;

u32 UPLLCON;

u32 CLKCON;

u32 CLKSLOW;

u32 CLKDIVN;

u32 CAMDIVN; /*增加*/

};

b. 同時(shí)在board/samsung/smdk2410/Makefile中

COBJS := smdk2410.o flash.oboot_init.o

c.在arch/arm/cpu/arm920t/u-boot.lds中,將lowlevel_init.o和boot_init.o鏈接到前4K.

.text :

{ arch/arm/cpu/arm920t/start.o (.text) board/samsung/smdk2410/lowlevel_init.o (.text) board/samsung/smdk2410/boot_init.o (.text) *(.text)

} boot_init.c.txt (下載后改名為boot.c放在board/samsung/smdk2410/下)

2.4 為了使u-boot啟動(dòng)后打印點(diǎn)東東,還需要修改arch/arm/cpu/arm920t/s3c24x0/speed.c

speed.c.txt(下載后改名為speed.c,替換以前的arch/arm/cpu/arm920t/s3c24x0/speed.c)

2.5. 最后寫到內(nèi)存0x33000000處還需要

a. 修改arch/arm/cpu/arm920t/start.S文件

161 #if 0

162 bl cpu_init_crit

163 #endif

b.修改 board/samsung/smdk2410/config.mk

25 #TEXT_BASE = 0x33d80000

26 TEXT_BASE = 0x33000000

2.6 make后寫到內(nèi)存中.