TQ2440 u-boot-2012.04.01移植一串口正常输出

开发环境：

系统：ubuntu 10.04.4

单板：tq2440

NAND FLASH：K9F1216U0A 256MB

NOR Flash：EN29LV160AB 2MB

SDRAM：HY57V561620 x2 64MB

NET：DM9000AEP

编译器：arm-linux-gcc-4.3.2

搭建开发环境详见ubuntu 10.04.4开发环境配置。

目标：

1.支持NOR Flash启动，串口正常输出

2.支持NAND启动

3.支持DM9000网卡

4.添加u-boot菜单

5.u-boot裁剪及制作补丁

一、获取源代码

ftp://ftp.denx.de/pub/u-boot/ 下载u-boot-2012.04.01.tar.bz2,解压到工作目录即可。交叉编译链arm-linux-gcc-4.3.2.tar.bz2到处都是，配置见ubuntu 10.04.4开发环境配置。

change@change:~$ cd Si/

change@change:~/Si$ ls

A10 OK6410 u-boot-1.1.6.tar.bz2

A13 pcduino u-boot-2012.04.01.tar.bz2

gcc-linaro-arm-linux-gnueabihf-4.8-2013.04-20130417_linux.tar.bz2 s3c2440 u-boot-2012.10.tar.bz2

jz4755 s5pc100

micro2440 TQ2440

change@change:~/Si$ tar xjf u-boot-2012.04.01.tar.bz2 -C TQ2440/

change@change:~/Si$ cd TQ2440/u-boot-2012.04.01/

方便移植，新建Source Insighe工程，阅读源码，工程添加源码是，以下未用文件可以不添加

board/samsung下除 smdk2410 以外的所有其它目标板文件夹不添加

arch/arm/cpu/下除 arm920t 、u-boot.lds以外的所有其它cpu目录不添加

include/目录下arm-XXX 的文件目录,只留下 asm-arm ，其它arm-XXX 不添加

include/configs 目录下除 smdk2410.h 以外的所有其它配置头文件不添加

二、新建单板

change@change:~/Si/TQ2440/u-boot-2012.04.01$ cp -rf board/samsung/smdk2410/ board/samsung/TQ2440

change@change:~/Si/TQ2440/u-boot-2012.04.01$ mv board/samsung/TQ2440/smdk2410.c board/samsung/TQ2440/TQ2440.c

修改board/samsung/TQ2440/Makefile文件中28行的COBJS改为：

COBJS := TQ2440.o

change@change:~/Si/TQ2440/u-boot-2012.04.01$ cp include/configs/smdk2410.h include/configs/TQ2440.h

change@change:~/Si/TQ2440/u-boot-2012.04.01$ vim boards.cfg

72：增加如下内容

TQ2440 arm arm920t - samsung s3c24x0

三、配置、编译
change@change:~/Si/TQ2440/u-boot-2012.04.01$ make TQ2440_config

Configuring for TQ2440 board...

change@change:~/Si/TQ2440/u-boot-2012.04.01$ make

arm-linux-objcopy -O srec hello_world hello_world.srec 2>/dev/null

arm-linux-objcopy -O binary hello_world hello_world.bin 2>/dev/null

make[1]: Leaving directory `/home/change/Si/TQ2440/u-boot-2012.04.01/examples/standalone'

make -C examples/api all

make[1]: Entering directory `/home/change/Si/TQ2440/u-boot-2012.04.01/examples/api'

make[1]: Nothing to be done for `all'.

make[1]: Leaving directory `/home/change/Si/TQ2440/u-boot-2012.04.01/examples/api'

编译成功，此时还不支持单板，需要修改代码。

四、修改代码，支持串口正常输出

1.修改时钟配置

arch/arm/cpu/arm920t/start.S：170，去掉以前的时钟配置，参考update程序改成自己的代码

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

/* default FCLK is 120 MHz ! */

// ldr r0, =CLKDIVN

// mov r1, #3

// str r1, [r0]

增加如下代码175：

#define S3C2440_MPLL_400MHZ     ((0x5c<<12)|(0x01<<4)|(0x01))
/* 2. 设置时钟 */
ldr r0, =0x4c000014
//	mov r1, #0x03;			  // FCLK:HCLK:PCLK=1:2:4, HDIVN=1,PDIVN=1
mov r1, #0x05;			  // FCLK:HCLK:PCLK=1:4:8
str r1, [r0]

/* 如果HDIVN非0，CPU的总线模蔦u0153覾u0160\u017e肻u017d印癴ast bus mode”变为“asynchronous bus mode” */
mrc	p15, 0, r1, c1, c0, 0		/* 读出控制\u0152腬u017d嫫?*/
orr	r1, r1, #0xc0000000			/* 设置为“asynchronous bus mode” */
mcr	p15, 0, r1, c1, c0, 0		/* 衆u017d入控制\u0152腬u017d嫫?*/

/* MPLLCON = S3C2440_MPLL_200MHZ */
ldr r0, =0x4c000004
ldr r1, =S3C2440_MPLL_400MHZ
str r1, [r0]

/* 启动ICACHE */
mrc p15, 0, r0, c1, c0, 0	@ read control reg
orr r0, r0, #(1<<12)
mcr	p15, 0, r0, c1, c0, 0   @ write it back

在board/samsung/TQ2440/TQ2440.c去掉对时钟MPLL的配置76：

/* to reduce PLL lock time, adjust the LOCKTIME register */

//writel(0xFFFFFF, &clk_power->locktime);

/* configure MPLL */

//writel((M_MDIV << 12) + (M_PDIV << 4) + M_SDIV,

// &clk_power->mpllcon);

2.修改SDRAM设置代码

同样参考update程序，改成自己的SDRAM初始化程序board/samsung/TQ2440/lowlevel_init.S：154的SMRDATA替换成如下代码：

SMRDATA:
.long 0x22011110	 //BWSCON
.long 0x00000700	 //BANKCON0
.long 0x00000700	 //BANKCON1
.long 0x00000700	 //BANKCON2
.long 0x00000700	 //BANKCON3
//.long 0x00000700	 //BANKCON4
.long 0x00000740	 //BANKCON4
.long 0x00000700	 //BANKCON5
.long 0x00018005	 //BANKCON6
.long 0x00018005	 //BANKCON7
.long 0x008C04F4	 // REFRESH
.long 0x000000B1	 //BANKSIZE
.long 0x00000030	 //MRSRB6
.long 0x00000030	 //MRSRB7

3.修改串口波特率设置

arch/arm/cpu/arm920t/s3c24x0/speed.c 发现82:get_HCLK(void)里支持CONFIG_S3C2440，解决方法如下：

include/configs/TQ2440.h:38

//#define CONFIG_S3C2410 /* specifically a SAMSUNG S3C2410 SoC */

#define CONFIG_S3C2440 /* specifically a SAMSUNG S3C2410 SoC */

再配置编译看看，有问题也可以及时修改

change@change:~/Si/TQ2440/u-boot-2012.04.01$make distclean

change@change:~/Si/TQ2440/u-boot-2012.04.01$ make TQ2440_config

Configuring for TQ2440 board...

change@change:~/Si/TQ2440/u-boot-2012.04.01$ make

s3c2410_nand.c: In function 's3c2410_hwcontrol':

s3c2410_nand.c:57: warning: implicit declaration of function 's3c2410_get_base_nand'

s3c2410_nand.c:57: warning: initialization makes pointer from integer without a cast

s3c2410_nand.c:72: error: dereferencing pointer to incomplete type

s3c2410_nand.c:72: error: dereferencing pointer to incomplete type

s3c2410_nand.c:75: error: dereferencing pointer to incomplete type

s3c2410_nand.c:75: error: dereferencing pointer to incomplete type

s3c2410_nand.c: In function 's3c2410_dev_ready':

s3c2410_nand.c:85: warning: initialization makes pointer from integer without a cast

s3c2410_nand.c:87: error: dereferencing pointer to incomplete type

s3c2410_nand.c: In function 'board_nand_init':

s3c2410_nand.c:129: warning: initialization makes pointer from integer without a cast

s3c2410_nand.c:150: error: dereferencing pointer to incomplete type

s3c2410_nand.c:153: error: dereferencing pointer to incomplete type

s3c2410_nand.c:154: error: dereferencing pointer to incomplete type

make[1]: *** [s3c2410_nand.o] Error 1

make[1]: Leaving directory `/home/change/Si/TQ2440/u-boot-2012.04.01/drivers/mtd/nand'

make: *** [drivers/mtd/nand/libnand.o] Error 2

果然出现错误，这样先解决串口问题，把NAND部分屏蔽掉再说drivers/mtd/nand/Makefile:42

COBJS-$(CONFIG_NAND_S3C2410) += s3c2410_nand.o //不定义宏CONFIG_NAND_S3C2410即可

接着找到include/configs/TQ2440.h:210

#ifdef CONFIG_CMD_NAND

#define CONFIG_NAND_S3C2410

#define CONFIG_SYS_S3C2410_NAND_HWECC

#define CONFIG_SYS_MAX_NAND_DEVICE 1

#define CONFIG_SYS_NAND_BASE 0x4E000000

#endif

屏蔽CONFIG_CMD_NAND即可，注意去掉2处宏定义，

include/configs/TQ2440.h:102//#define CONFIG_CMD_NAND

include/config_cmd_all.j64://#define CONFIG_CMD_NAND /* NAND support */

我也是编译几次，发现nand还是编译进去了报错，修改完继续编译

change@change:~/Si/TQ2440/u-boot-2012.04.01$ make distclean

change@change:~/Si/TQ2440/u-boot-2012.04.01$ make TQ2440_config

Configuring for TQ2440 board...

change@change:~/Si/TQ2440/u-boot-2012.04.01$ make

fs/yaffs2/libyaffs2.o: In function `yaffs_StartUp':

/home/change/Si/TQ2440/u-boot-2012.04.01/fs/yaffs2/yaffscfg.c:210: undefined reference to `nand_info'

make: *** [u-boot] Error 1

直接屏蔽掉yaffs

include/configs/TQ2440.h:227//#define CONFIG_YAFFS2

记得编译之前要make distclean下，不然修改没生效，还是报错，就这个小问题，害我重编译好多次。



change@change:~/Si/TQ2440/u-boot-2012.04.01$ make distclean

Generating include/autoconf.mk

change@change:~/Si/TQ2440/u-boot-2012.04.01$ make TQ2440_config

Configuring for TQ2440 board...

change@change:~/Si/TQ2440/u-boot-2012.04.01$ make
OK编译通过，此时生成的u-boot.bin,烧进NOR Flash，串口一个输出正常。下一阶段移植u-boot支持NAND启动。