TQ2440移植u-boot-2010.06-rc1---2搭建框架

一. 准备工作

1. 软硬件

主  机：VMWare--ubuntu 10.10

开发板：TQ2440--128MB Nand, Kernel:3.4.0

编译器：EABI-4.3.3_EmbedSky_20091210.tar.bz2

u-boot：u-boot-2012.07.tar.bz2

2. 工具链,解压EABI-4.3.3_EmbedSky_20091210.tar.bz2到/opt目录

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

4.3.3/         crosstools_3.4.5_softfloat/ 

3. 这次移植是以smdk2410为模版,所以首先要删除多余的目录

//a. 删除arch下除arm以外的所有目录

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以外的所有目录

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 录下除s3c24x0以外的所有目录

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目录不能删

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. 删除include/configs目录下除smdk2410.h文件以外的所有头文件 

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

//f. 去掉board下多余的目录

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. 生成内存可运行的u-boot

a. 修改Makefile

 156 ifeq ($(HOSTARCH),$(ARCH))
 157 CROSS_COMPILE ?=
 158 endif
 159
 160 CROSS_COMPILE ?= /opt/EmbedSky/crosstools_3.4.5_softfloat/gcc-3.4.5-glibc-2.3.6/arm-linux/bin/arm-linux-

b. 修改链接地址 board/samsung/smdk2410/config.mk 

 #烧到板子上TEXT_BASE=0x33d80000
 25 TEXT_BASE = 0x33d80000
 #仿真器调试TEXT_BASE=0x33000000
 26 #TEXT_BASE = 0x33000000
#为什么要选这个呢? 因其只要在内存中就可以了,但是因为TQ2440有一个选项
[7] Download Program (uCOS-II or TQ2440_Test) to SDRAM and Run it
写到内存的0x33000000并运行,这样编出u-boot.bin后,直接写到内存就可以运行了,非常方便.

c.编译,直接用smdk2410的,比较省事

make smdk2410_config
make

二. 可以从nand_flash启动的u-boot

2.1 初始化内存

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 ,并将u-boot代码复制到TEXT_BASE处

修改 arch/arm/cpu/arm920t/start.S

/*注掉这一段*/

#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

/*把栈初始化提前,因为下面要调用C函数*/

    /* 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 /*调用clock_init,初始化clock*/

    bl my_nand_init    /*调用my_nand_init,进行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  /*调用my_nand_read_page,将u-boot从nand复制到TEXT_BASE处*/

#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目录下建文件boot_init.c,完成初始化clock_controler ,并将u-boot代码复制到TEXT_BASE处的实际操作

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. 同时在board/samsung/smdk2410/Makefile中

COBJS := smdk2410.o flash.o boot_init.o

c.在arch/arm/cpu/arm920t/u-boot.lds中,将lowlevel_init.o和boot_init.o链接到前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   (下载后改名为boot.c放在board/samsung/smdk2410/下)

2.4 为了使u-boot启动后打印点东东,还需要修改arch/arm/cpu/arm920t/s3c24x0/speed.c

 speed.c.txt   (下载后改名为speed.c,替换以前的arch/arm/cpu/arm920t/s3c24x0/speed.c)

2.5. 最后写到内存0x33000000处还需要

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后写到内存中.

[参考文章]