开发环境：
系统：ubuntu 10.04.4
单板：tq2440
NAND FLASH：K9F1216U0A 256MB
NOR Flash：AM29LV160A 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.串口正常输出
2.支持NOR Flash
3.支持DM9000网卡
?一、获取源代码
ftp://ftp.denx.de/pub/u-boot/
下载u-boot-1.1.6.tar.bz2,并解压到工作目录
change@change:~/Si$?tar -jxvf u-boot-1.1.6.tar.bz2 -C TQ2440/
change@change:~$ cd Si/TQ2440/u-boot-1.1.6/
change@change:~/Si/TQ2440/u-boot-1.1.6$ make distclean
change@change:~/Si/TQ2440/u-boot-1.1.6$?ls
arm_config.mk????????????????? COPYING?? fs????????????? lib_m68k??????? MAKEALL?????????????? nios_config.mk
avr32_config.mk??????????????? cpu?????? i386_config.mk? lib_microblaze? Makefile????????????? post
blackfin_config.mk???????????? CREDITS?? include???????? lib_mips??????? microblaze_config.mk? ppc_config.mk
board????????????????????????? disk????? lib_arm???????? lib_nios??????? mips_config.mk??????? README
CHANGELOG????????????????????? doc?????? lib_avr32?????? lib_nios2?????? mkconfig????????????? rtc
CHANGELOG-before-U-Boot-1.1.5? drivers?? lib_blackfin??? lib_ppc???????? nand_spl????????????? rules.mk
common???????????????????????? dtt?????? lib_generic???? m68k_config.mk? net?????????????????? tools
config.mk????????????????????? examples? lib_i386??????? MAINTAINERS???? nios2_config.mk
change@change:~/Si/TQ2440/u-boot-1.1.6$
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/下除 smdk2410 以外的所有其它目标板文件夹不添加
cpu/下除 arm920t 以外的所有其它cpu目录不添加
根目录下lib_XXX? 的库文件目录,只留下 lib_arm 和 lib_generic ，其它lib_XXX?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-1.1.6$?cp -rf board/smdk2410/ board/TQ2440
change@change:~/Si/TQ2440/u-boot-1.1.6$?mv board/TQ2440/smdk2410.c board/TQ2440/TQ2440.c
change@change:~/Si/TQ2440/u-boot-1.1.6$
修改board/TQ2440/Makefile文件中28行的COBJS改为：
? COBJS?? := TQ2440.o flash.o
change@change:~/Si/TQ2440/u-boot-1.1.6$?cp include/configs/smdk2410.h include/configs/TQ2440.h
change@change:~/Si/TQ2440/u-boot-1.1.6$
修改顶层（u-boot-1.1.6目录）Makefile 文件1882行，增加：?
TQ2440_config :? unconfig?
???????????????? @$(MKCONFIG) $(@:_config=) arm arm920t TQ2440 NULL s3c24x0?
?注释：各项的意思如下:?
????arm: CPU? 的架构(ARCH)?
????arm920t: CPU? 的类型(CPU),其对应于 cpu/arm920t 子目录。?
????TQ2440:? 开发板的型号(BOARD),对应于 board/micro2440 目录。?
????NULL:? 开发者/或经销商(vender)。(此处没加 vender,为 NULL。)?
????s3c24x0: 片上系统(SOC)。
已配置默认交叉编译链，这里采用默认配置，不需配置。
三、配置、编译、测试
change@change:~/Si/TQ2440/u-boot-1.1.6$?make distclean
change@change:~/Si/TQ2440/u-boot-1.1.6$?make TQ2440_config
Configuring for TQ2440 board...
change@change:~/Si/TQ2440/u-boot-1.1.6$?make
........
arm-linux-objcopy --gap-fill=0xff -O srec u-boot u-boot.srec
arm-linux-objcopy --gap-fill=0xff -O binary u-boot u-boot.bin
change@change:~/Si/TQ2440/u-boot-1.1.6$?ls
arm_config.mk????????????????? cpu???????????? include???????? lib_nios????????????? mkconfig???????? rules.mk
avr32_config.mk??????????????? CREDITS???????? lib_arm???????? lib_nios2???????????? nand_spl???????? System.map
blackfin_config.mk???????????? disk??????????? lib_avr32?????? lib_ppc?????????????? net????????????? tools
board????????????????????????? doc???????????? lib_blackfin??? m68k_config.mk??????? nios2_config.mk? u-boot
CHANGELOG????????????????????? drivers???????? lib_generic???? MAINTAINERS?????????? nios_config.mk?? u-boot.bin
CHANGELOG-before-U-Boot-1.1.5? dtt???????????? lib_i386??????? MAKEALL?????????????? post???????????? u-boot.map
common???????????????????????? examples??????? lib_m68k??????? Makefile????????????? ppc_config.mk??? u-boot.srec
config.mk????????????????????? fs????????????? lib_microblaze? microblaze_config.mk? README
COPYING??????????????????????? i386_config.mk? lib_mips??????? mips_config.mk??????? rtc
change@change:~/Si/TQ2440/u-boot-1.1.6$
可以看到编译顺利生成u-boot.bin,但是还不支持TQ2440，烧到单板不会有任何输出。
四、修改源码支持单板串口输出
1.修改内存SDRM配置
? 进入/board/TQ440目录修改 lowlevel_init.S文件54行如下：?
#define B1_BWSCON?? (DW16)?? //(DW32) (IDE)?
#define B2_BWSCON?? (DW16)?? //??? (IDE)?
#define B3_BWSCON?? (DW16 + WAIT + UBLB) //CS8900?
#define B4_BWSCON?? (DW16)???? //DM9000?
#define B5_BWSCON?? (DW8)??? //(DW16)?
#define B6_BWSCON?? (DW32)?
#define B7_BWSCON?? (DW32)
? 修改lowlevel_init.S文件126行如下：?
#define REFCNT 0x4f4?
/*period=7.8125us,HCLK=100Mhz,(2048+1-7.8125*100)=0x4F4 */?
//1113? /* period=15.6us,HCLK=60Mhz,(2048+1-15.6*60) */
2.修改时钟
S3c2440 的时钟计算公式和 s3c2410 不一样，对于 s3c2440 开发板，将 PCLK 设为
400Mhz，分频比为FCLK:HCLK:PCLK=1:4:8。?首先屏蔽原来s3c2410的时钟设置，修改cpu/arm920t/目录下start.S文件148行如下：
#if 0?
? /* FCLK:HCLK:PCLK = 1:2:4 */?
? /* default FCLK is 120 MHz ! */?
? ldr? r0,=CLKDIVN?
? mov r1,#3?
? str? r1,[r0]?
#endif?
?然后在board_init函数中重新配置时钟，修改board/TQ2440/TQ2440.c文件中的
68行的board_init函数，并增加一些声明：?
/* S3C2440: Mpll = (2*m * Fin) / (p * 2^s),UPLL = (m * Fin) / (p * 2^s)?
* m = M (the value for divider M)+ 8,p = P (the value for divider P) + 2?
*/?
/* Fin = 12.0000MHz */?
#define S3C2440_MPLL_400MHZ? ((0x5c<<12)|(0x02<<4)|(0x01))??? //HJ 400MHz?
#define S3C2440_UPLL_48MHZ ((0x38<<12)|(0x02<<4)|(0x02))???? //HJ 100MHz?
#define S3C2440_CLKDIV?? 0x05??? /* FCLK:HCLK:PCLK = 1:4:8,UCLK = UPLL */?
?//HJ 100MHz?
/* S3C2410: Mpll,Upll = (m * Fin) / (p * 2^s)?
* m = M (the value for divider M)+ 8,p = P (the value for divider P) + 2?
*/?
#define S3C2410_MPLL_200MHZ???? ((0x5c<<12)|(0x04<<4)|(0x00))?
#define S3C2410_UPLL_48MHZ????? ((0x28<<12)|(0x01<<4)|(0x02))?
#define S3C2410_CLKDIV????????? 0x03??? /* FCLK:HCLK:PCLK = 1:2:4 */????
以上代码针对s3c2410、s3c2440分别定义了MPLL、UPLL寄存器的值。开发板输入时钟为 12Mhz（这在 include/configs/TQ2440.h中的宏 CONFIG_SYS_CLK_FREQ 中定义），可以根据代码中的计算公式针对自己的开发板修改系统时钟。下面是针对 s3c2410、s3c2440分别使用不同的宏设置系统时钟,用下面替换以前的board_init
int board_init (void)?
{?
?S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();?
?
?S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();?
??
?/* set up the I/O ports */?
?gpio->GPACON = 0x007FFFFF;?
?gpio->GPBCON = 0x00044555;?
?gpio->GPBUP = 0x000007FF;?
?gpio->GPCCON = 0xAAAAAAAA;?
?gpio->GPCUP = 0x0000FFFF;?
?gpio->GPDCON = 0xAAAAAAAA;?
?gpio->GPDUP = 0x0000FFFF;?
?gpio->GPECON = 0xAAAAAAAA;?
?gpio->GPEUP = 0x0000FFFF;?
?gpio->GPFCON = 0x000055AA;?
?gpio->GPFUP = 0x000000FF;?
?gpio->GPGCON = 0xFF95FFBA;?
?gpio->GPGUP = 0x0000FFFF;?
?gpio->GPHCON = 0x002AFAAA;?
?gpio->GPHUP = 0x000007FF;?
?/* support both of S3C2410 and S3C2440 */?
?if ((gpio->GSTATUS1 == 0x32410000) || (gpio->GSTATUS1 == 0x32410002))?
?{?
? /* FCLK:HCLK:PCLK = 1:2:4 */?
? clk_power->CLKDIVN = S3C2410_CLKDIV;?
???
? /* change to asynchronous bus mod */?
? __asm__(??? "mrc??? p15,r1,c1,c0,0n"??? /* read ctrl register?? */???
???? "orr??? r1,#0xc0000000n"????? /* Asynchronous???????? */???
???? "mcr??? p15,0n"??? /* write ctrl register? */???
???? :::"r1"?
??? );?
?????????
? /* to reduce PLL lock time,adjust the LOCKTIME register */?
? clk_power->LOCKTIME = 0xFFFFFF;?
???
? /* configure MPLL */?
? clk_power->MPLLCON = S3C2410_MPLL_200MHZ;?
???
? /* some delay between MPLL and UPLL */?
? delay (4000);?
???
? /* configure UPLL */?
? clk_power->UPLLCON = S3C2410_UPLL_48MHZ;?
???
? /* some delay between MPLL and UPLL */?
? delay (8000);?
???
? /* arch number of SMDK2410-Board */?
? gd->bd->bi_arch_number = MACH_TYPE_SMDK2410;
?}?
?else?
?{?
? clk_power->CLKDIVN = S3C2440_CLKDIV;??? //HJ 1:4:8?
?
? /* change to asynchronous bus mod */?
? __asm__(??? "mrc??? p15,0n"??? /* write ctrl register? */???
???? :::"r1"?
??? );?
???
? /* to reduce PLL lock time,adjust the LOCKTIME register */?
? clk_power->LOCKTIME = 0xFFFFFF;?
???
? /* configure MPLL */?
? clk_power->MPLLCON = S3C2440_MPLL_400MHZ;? //fin=12.000MHz?
???
? /* some delay between MPLL and UPLL */?
? delay (4000);?
???
? /* configure UPLL */?
? clk_power->UPLLCON = S3C2440_UPLL_48MHZ;?? //fin=12.000MHz?
???
? /* some delay between MPLL and UPLL */?
? delay (8000);?
???
? /* arch number of SMDK2440-Board */?
? gd->bd->bi_arch_number = MACH_TYPE_S3C2440;?
?}?
?/* adress of boot parameters */?
?gd->bd->bi_boot_params = 0x30000100;?
??
?icache_enable();?
?dcache_enable();?
?return 0;?
}
最后一步，获取系统时钟的函数需要针对s3c2410、s3c2440的不同进行修改。 在后面设置串口波特率时需要获得系统时钟,就是在 U-Boot 的第二阶段,lib_arm/board.c
中start_armboot 函数调用 serial_init 函数初始化串口时,会调用 get_PCLK? 函数。它在 cpu/arm920t/s3c24x0/speed.c 中定义,与它相关的还有 get_HCLK、get_PLLCLK 等函数。 前面的 board_init? 函数在识别出 S3C2410? 或 S3C2440? 后,设置了机器类型 ID:gd?bd?bi_arch_number,后面的函数可以通过它来分辨是 S3C2410 还是 S3C2440。首先要在程序的开头增加如下一行,DECLARE_GLOBAL_DATA_PTR;这样才可以使用 gd 变量。?
??在 cpu/arm920t/s3c24x0/speed.c 中修改：?
?在程序开头40行增加一行：DECLARE_GLOBAL_DATA_PTR;这样才可以使用 gd 变量?
?修改54行：get_PPLCLK 函数：?
static ulong get_PLLCLK(int pllreg)?
{?
?S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();?
??? ulong r,m,p,s;?
??? if (pllreg == MPLL)?
?r = clk_power->MPLLCON;?
??? else if (pllreg == UPLL)?
?r = clk_power->UPLLCON;?
??? else?
?hang();?
??? m = ((r & 0xFF000) >> 12) + 8;?
??? p = ((r & 0x003F0) >> 4) + 2;?
??? s = r & 0x3;?
?/* support both of S3C2410 and S3C2440 */?
??? if (gd->bd->bi_arch_number == MACH_TYPE_SMDK2410)?
??????? return((CONFIG_SYS_CLK_FREQ * m) / (p << s));?
??? else?
??????? return((CONFIG_SYS_CLK_FREQ * m * 2) / (p << s));?? /* S3C2440 */?
}?
由于分频系数的设置方法也不一样，get_HCLK、get_PCLK也需要修改。对于s3c2410，沿用原来的计算方法，else分支中是s3c2440的代码，如下所示：
//修改get_HCLK、get_PCLK：?
/* for s3c2440 */?
#define S3C2440_CLKDIVN_PDIVN??????? (1<<0)?
#define S3C2440_CLKDIVN_HDIVN_MASK?? (3<<1)?
#define S3C2440_CLKDIVN_HDIVN_1????? (0<<1)?
#define S3C2440_CLKDIVN_HDIVN_2????? (1<<1)?
#define S3C2440_CLKDIVN_HDIVN_4_8??? (2<<1)?
#define S3C2440_CLKDIVN_HDIVN_3_6??? (3<<1)?
#define S3C2440_CLKDIVN_UCLK???????? (1<<3)?
?
#define S3C2440_CAMDIVN_CAMCLK_MASK? (0xf<<0)?
#define S3C2440_CAMDIVN_CAMCLK_SEL?? (1<<4)?
#define S3C2440_CAMDIVN_HCLK3_HALF?? (1<<8)?
#define S3C2440_CAMDIVN_HCLK4_HALF?? (1<<9)?
#define S3C2440_CAMDIVN_DVSEN??????? (1<<12)?
?
/* return HCLK frequency */?
ulong get_HCLK(void)?
{?
?S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();?
??? unsigned long clkdiv;?
?unsigned long camdiv;?
??? int hdiv = 1;?
?
?/* support both of S3C2410 and S3C2440 */?
??? if (gd->bd->bi_arch_number == MACH_TYPE_SMDK2410)?
??????? return((clk_power->CLKDIVN & 0x2) ? get_FCLK()/2 : get_FCLK());?
??? else?
??? {?
??????? clkdiv = clk_power->CLKDIVN;?
??????? camdiv = clk_power->CAMDIVN;?
?
??????? /* work out clock scalings */?
?
??????? switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {?
??????? case S3C2440_CLKDIVN_HDIVN_1:?
??????????? hdiv = 1;?
??????????? break;?
?
??????? case S3C2440_CLKDIVN_HDIVN_2:?
??????????? hdiv = 2;?
??????????? break;?
?
??????? case S3C2440_CLKDIVN_HDIVN_4_8:?
??????????? hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;?
??????????? break;?
?
??????? case S3C2440_CLKDIVN_HDIVN_3_6:?
??????????? hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;?
??????????? break;?
??????? }?
??????? return get_FCLK() / hdiv;?
??? }?
}?
?
/* return PCLK frequency */?
ulong get_PCLK(void)?
{?
?S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();?
?unsigned long clkdiv;?????
?unsigned long camdiv;?
?int hdiv = 1;?
?/* support both of S3C2410 and S3C2440 */
??? if (gd->bd->bi_arch_number == MACH_TYPE_SMDK2410)?
??????? return((clk_power->CLKDIVN & 0x1) ? get_HCLK()/2 : get_HCLK());?
??? else?
??? {????
??????? clkdiv = clk_power->CLKDIVN;?
??????? camdiv = clk_power->CAMDIVN;?
?
??????? /* work out clock scalings */?
?
??????? switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {?
??????? case S3C2440_CLKDIVN_HDIVN_1:?
??????????? hdiv = 1;?
??????????? break;?
?
??????? case S3C2440_CLKDIVN_HDIVN_2:?
??????????? hdiv = 2;?
??????????? break;?
?
??????? case S3C2440_CLKDIVN_HDIVN_4_8:?
??????????? hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;?
??????????? break;?
?
??????? case S3C2440_CLKDIVN_HDIVN_3_6:?
??????????? hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;?
??????????? break;?
??????? }?
??????? return get_FCLK() / hdiv / ((clkdiv & S3C2440_CLKDIVN_PDIVN)? 2:1);?
??? }?
}?
?在 include/s3c24x0.h? 中重新定义 S3C24X0_CLOCK_POWER? 结构体，在 include/s3c24x0.h? 中,S3C24X0_CLOCK_POWER? 结构体中增加:129 行
?S3C24X0_REG32??? CAMDIVN; /* for s3c2440*/?
?至此，对s3c2440的支持（时钟配置部分）就算做好了。下面重新配置、编译
change@change:~/Si/TQ2440/u-boot-1.1.6$?make distclean
change@change:~/Si/TQ2440/u-boot-1.1.6$?make TQ2440_config
Configuring for TQ2440 board...
change@change:~/Si/TQ2440/u-boot-1.1.6$?make
make[1]: Leaving directory `/home/change/Si/TQ2440/u-boot-1.1.6/common'
UNDEF_SYM=`arm-linux-objdump -x lib_generic/libgeneric.a board/TQ2440/libTQ2440.a cpu/arm920t/libarm920t.a cpu/arm920t/s3c24x0/libs3c24x0.a lib_arm/libarm.a fs/cramfs/libcramfs.a fs/fat/libfat.a fs/fdos/libfdos.a fs/jffs2/libjffs2.a fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a net/libnet.a disk/libdisk.a rtc/librtc.a dtt/libdtt.a drivers/libdrivers.a drivers/nand/libnand.a drivers/nand_legacy/libnand_legacy.a drivers/sk98lin/libsk98lin.a post/libpost.a post/cpu/libcpu.a common/libcommon.a |sed ?-n -e 's/.*(__u_boot_cmd_.*)/-u1/p'|sort|uniq`;
? ? ? ? ? ? ? ? cd /home/change/Si/TQ2440/u-boot-1.1.6 && arm-linux-ld -Bstatic -T /home/change/Si/TQ2440/u-boot-1.1.6/board/TQ2440/u-boot.lds -Ttext 0x33F80000 ?$UNDEF_SYM cpu/arm920t/start.o
? ? ? ? ? ? ? ? ? ? ? ? --start-group lib_generic/libgeneric.a board/TQ2440/libTQ2440.a cpu/arm920t/libarm920t.a cpu/arm920t/s3c24x0/libs3c24x0.a lib_arm/libarm.a fs/cramfs/libcramfs.a fs/fat/libfat.a fs/fdos/libfdos.a fs/jffs2/libjffs2.a fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a net/libnet.a disk/libdisk.a rtc/librtc.a dtt/libdtt.a drivers/libdrivers.a drivers/nand/libnand.a drivers/nand_legacy/libnand_legacy.a drivers/sk98lin/libsk98lin.a post/libpost.a post/cpu/libcpu.a common/libcommon.a --end-group -L /home/change/tools/usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/armv4t -lgcc
? ? ? ? ? ? ? ? ? ? ? ? -Map u-boot.map -o u-boot
arm-linux-objcopy --gap-fill=0xff -O srec u-boot u-boot.srec
arm-linux-objcopy --gap-fill=0xff -O binary u-boot u-boot.bin
change@change:~/Si/micro2440/u-boot-1.1.6$?
编译成功，最终在u-boot-1.1.6目录下生成u-boot.bin，下载到单板NOR flash设置串口115200 8 n 1串口就有输出了。
?五、增加Nor Flash支持
TQ2440开发板使用2M的EN29LV160A。
?由于AM29LV800与EN29LV160A相似，修改配置文件/include/configs/TQ2440.h 156:如下：
?/*-----------------------------------------------------------------------?
?* FLASH and environment organization?
? */?
#if 0?
#define CONFIG_AMD_LV400 ?1 ?/* uncomment this if you have a LV400 flash */?
#endif?
#define CONFIG_AMD_LV800 ?1 ?/* uncomment this if you have a LV800 flash */?
?
#define CFG_MAX_FLASH_BANKS 1 ?/* max number of memory banks */?
#ifdef CONFIG_AMD_LV800?
#define PHYS_FLASH_SIZE ?0x00200000 /* 2MB */?
#define CFG_MAX_FLASH_SECT ?(19) /* max number of sectors on one chip */?
#define CFG_ENV_ADDR ? (CFG_FLASH_BASE + 0xF0000) /* addr of environment */?
#endif?
#ifdef CONFIG_AMD_LV400?
#define PHYS_FLASH_SIZE ?0x00080000 /* 512KB */?
#define CFG_MAX_FLASH_SECT ?(11) /* max number of sectors on one chip */?
#define CFG_ENV_ADDR ? (CFG_FLASH_BASE + 0x070000) /* addr of environment */?
#endif?
?
/* timeout values are in ticks */?
#define CFG_FLASH_ERASE_TOUT (5*CFG_HZ) /* Timeout for Flash Erase */?
#define CFG_FLASH_WRITE_TOUT (5*CFG_HZ) /* Timeout for Flash Write */?
?
#define ?CFG_ENV_IS_IN_FLASH ?1?
#define CFG_ENV_SIZE ?0x10000 /* Total Size of Environment Sector */?
最后make一下，没有错误，加载到内存中运行正常。
?六、增加对网卡的支持，TQ开发板使用100M的DM9000。
?u-boot 自带网卡驱动,所以只要做些设置即可。
(1)DM9000网卡使用的片选信号是nGCS 4,也就说明DM9000使用了BANK4。修改lowlevel_init.S（路径：board/TQ2440/lowlevel_init.S）。
/* BWSCON */
#define DW8 ? ? ?(0x0)
#define DW16 ? ?(0x1)
#define DW32 ? ?(0x2)
#define WAIT ? ?(0x1<<2)
#define UBLB ? ?(0x1<<3)
#define B1_BWSCON ? ?(DW32)
#define B2_BWSCON ? ?(DW16)
#if 0
#define B3_BWSCON ? ?(DW16 + WAIT + UBLB)
#endif
#define B3_BWSCON ? ?(DW16 + UBLB)
#define B4_BWSCON ? ?(DW16 + WAIT + UBLB)
#define B5_BWSCON ? ?(DW16)
#define B6_BWSCON ? ?(DW32)
#define B7_BWSCON ? ?(DW32)
? ? 修改前BANK3外接的CS8900网卡，将BANK3注释掉，修改数据宽度为16位，设置BANK4数据宽度16位，使用WAIT和nBE信号。
#define B4_Tacs ? ?0x0 ? ?/*0clk */
#define B4_Tcos ? ?0x3 ? ?/*4clk */
#define B4_Tacc ? ?0x7 ? ?/* 14clk */
#define B4_Tcoh ? ?0x1 ? ?/*1clk */
#define B4_Tah ? ? ?0x3 ? ?/*4clk */
#define B4_Tacp ? ?0x6 ? ?/*6clk */
#define B4_PMC ? ?0x0 ? ?/* normal */
? ? 根据DM9000数据手册设置时序，具体见DM9000数据手册。
?(2)增加网卡的 DM9000 的配置,include/configs/TQ2440.h ?的56行和96行?
/*?
?* Hardware drivers?
?*/?
#define CONFIG_DRIVER_DM9000 1 //去掉了原来 CS8900 的配置?
#define CONFIG_DM9000_BASE ? ?0x20000000?
#define DM9000_IO ? ?CONFIG_DM9000_BASE?
#define DM9000_DATA ? ? ?(CONFIG_DM9000_BASE + 4)?
#define CONFIG_DM9000_USE_16BIT?
?
#define CONFIG_ETHADDR ? ? ?10:23:45:67:89:AB?
#define CONFIG_NETMASK ? ? ?255.255.255.0?
#define CONFIG_IPADDR ? ? ?10.21.17.110?
#define CONFIG_SERVERIP ? ?10.21.17.85?
注释掉CS8900的信息，添加DM9000的配置信息。
? ? 宏定义CONFIG_DRIVER_DM9000为1表示配置使用DM9000网卡，u-boot编译时会将DM9000相关的驱动编译进去。
? ? 其中0x20000000是DM9000的基址（BANK4），由于DM9000只有一条地址线CMD（LADDR2）用于
? ? 区别是数据还是地址（CMD为低时数据总线上传输的是地址信号，CMD为高时传输的是数据信号），
? ? 所以DM9000_DATA为0x20000004，DM9000_IO为0x20000000。
? ??
我的PC和开发板使用路由器相连，PC IP地址为172.16.1.111，开发板设置为1172.16.1.133，保证在同一个网段就行。
增加ping命令：
#define CONFIG_COMMANDS
? ? ? ? ? ? ? ?(CONFIG_CMD_DFL|
? ? ? ? ? ? ? ? ? CFG_CMD_CACHE|
? ? ? ? ? ? ? ? /*CFG_CMD_NAND|*/
? ? ? ? ? ?/*CFG_CMD_EEPROM |*/
? ? ? ? ? ? ? ? ? ? ?/*CFG_CMD_I2C|*/
? ? ? ? ? ? ? ? ? ? /*CFG_CMD_USB|*/
? ? ? ? ? ? ? ? ?FG_CMD_REGINFO|
? ? ? ? ? ? ? ? ? ? ?CFG_CMD_PING|
? ? ? ? ? ? ? ? ? ? ?CFG_CMD_DATE|
? ? ? ? ? ? ? ? ? ? ? ? CFG_CMD_ELF)
? ? 仿照CMD命令格式，我们使用CFG_CMD_PING增加对ping的支持。
change@change:~/Si/TQ2440/u-boot-1.1.6$?make distclean
change@change:~/Si/TQ2440/u-boot-1.1.6$?make TQ2440_config?
Configuring for TQ2440 board...
change@change:~/Si/TQ2440/u-boot-1.1.6$?make
make[1]: Leaving directory `/home/change/Si/TQ2440/u-boot-1.1.6/common'
UNDEF_SYM=`arm-linux-objdump -x lib_generic/libgeneric.a board/TQ2440/libTQ2440.a cpu/arm920t/libarm920t.a cpu/arm920t/s3c24x0/libs3c24x0.a lib_arm/libarm.a fs/cramfs/libcramfs.a fs/fat/libfat.a fs/fdos/libfdos.a fs/jffs2/libjffs2.a fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a net/libnet.a disk/libdisk.a rtc/librtc.a dtt/libdtt.a drivers/libdrivers.a drivers/nand/libnand.a drivers/nand_legacy/libnand_legacy.a drivers/sk98lin/libsk98lin.a post/libpost.a post/cpu/libcpu.a common/libcommon.a |sed ?-n -e 's/.*(__u_boot_cmd_.*)/-u1/p'|sort|uniq`;
? ? ? ? ? ? ? ? cd /home/change/Si/TQ2440/u-boot-1.1.6 && arm-linux-ld -Bstatic -T /home/change/Si/TQ2440/u-boot-1.1.6/board/TQ2440/u-boot.lds -Ttext 0x33F80000 ?$UNDEF_SYM cpu/arm920t/start.o
? ? ? ? ? ? ? ? ? ? ? ? --start-group lib_generic/libgeneric.a board/TQ2440/libTQ2440.a cpu/arm920t/libarm920t.a cpu/arm920t/s3c24x0/libs3c24x0.a lib_arm/libarm.a fs/cramfs/libcramfs.a fs/fat/libfat.a fs/fdos/libfdos.a fs/jffs2/libjffs2.a fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a net/libnet.a disk/libdisk.a rtc/librtc.a dtt/libdtt.a drivers/libdrivers.a drivers/nand/libnand.a drivers/nand_legacy/libnand_legacy.a drivers/sk98lin/libsk98lin.a post/libpost.a post/cpu/libcpu.a common/libcommon.a --end-group -L /home/change/tools/usr/local/arm/4.3.2/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.2/armv4t -lgcc
? ? ? ? ? ? ? ? ? ? ? ? -Map u-boot.map -o u-boot
arm-linux-objcopy --gap-fill=0xff -O srec u-boot u-boot.srec
arm-linux-objcopy --gap-fill=0xff -O binary u-boot u-boot.bin
change@change:~/Si/TQ2440/u-boot-1.1.6$?cp u-boot.bin /home/change/work/tftpboot/
七、烧写、测试
单板NOR Flash启动，通过u-boot烧写上面的程序到NOR Flash
U-Boot 1.1.6 (Mar 24 2012 - 03:44:51)
DRAM: ?64 MB
Flash: ?2 MB
NAND: ?256 MiB
In: ? ?serial
Out: ? serial
Err: ? serial
Hit any key to stop autoboot: ?0?
TQ2440 # printenv
bootargs=noinitrd root=/dev/mtdblock2 init=/linuxrc console=ttySAC0
bootdelay=3
baudrate=115200
ethaddr=08:00:3e:26:0a:5b
bootcmd=nboot 0x30000000 0 0;bootm 0x30000000
ilesize=168d8
fileaddr=32000000
gatewayip=172.16.1.1
netmask=255.255.255.0
ipaddr=172.16.1.111
serverip=172.16.1.133
stdin=serial
stdout=serial
stderr=serial
Environment size: 529/131068 bytes
TQ2440 # tftp 0x32000000 u-boot.bin
dm9000 i/o: 0x20000000,id: 0x90000a46?
MAC: 00:80:00:80:00:80
could not establish link
TFTP from server 172.16.1.133; our IP address is 172.16.1.111
Filename 'u-boot.bin'.
Load address: 0x32000000
Loading: ###################
done
Bytes transferred = 92372 (168d4 hex)
TQ2440 # protect off all
Un-Protect Flash Bank # 1
TQ2440 # erase 0 0x7ffff
Erasing sector ?0 ... ok.
Erasing sector ?1 ... ok.
Erasing sector ?2 ... ok.
Erasing sector ?3 ... ok.
Erasing sector ?4 ... ok.
Erasing sector ?5 ... ok.
Erasing sector ?6 ... ok.
Erasing sector ?7 ... ok.
Erasing sector ?8 ... ok.
Erasing sector ?9 ... ok.
Erasing sector 10 ... ok.
Erased 11 sectors
TQ2440 # cp.b 0x32000000 0 0x80000
Copy to Flash... done
TQ2440 #?
烧写成功，重启单板，串口输出如下：
U-Boot 1.1.6 (Apr 27 2013 - 21:27:15)
DRAM: ?64 MB
Flash: ?2 MB
In: ? ?serial
Out: ? serial
Err: ? serial
Hit any key to stop autoboot: ?0?
TQ2440 # printenv
bootcmd=nand read.jffs2 0x32000000 kernel; bootm 0x32000000
bootdelay=3
baudrate=115200
ethaddr=08:00:3e:26:0a:5b
mtdids=nand0=nandflash0
mtdparts=mtdparts=nandflash0:2m@0(kernel),8m(jffs2),-(yaffs)
filesize=3edbcc
fileaddr=30000000
netmask=255.255.255.0
ipaddr=192.168.1.17
bootargs=noinitrd console=ttySAC0 root=/dev/mtdblock1 rootfstype=jffs2
partition=nand0,0
mtddevnum=0
mtddevname=kernel
serverip=192.168.1.107
stdin=serial
stdout=serial
stderr=serial
Environment size: 458/65532 bytes
TQ2440 # set ipaddr 172.16.1.111
TQ2440 # set serverip 172.16.1.133
TQ2440 # set gatewayip 172.16.1.1?
TQ2440 # ping 172.16.1.133
dm9000 i/o: 0x20000000,id: 0x90000a46?
MAC: 00:80:00:80:00:80
could not establish link
host 172.16.1.133 is alive
TQ2440 # tftp 0x32000000 u-boot_2012.04.01.bin
dm9000 i/o: 0x20000000,id: 0x90000a46?
MAC: 00:80:00:80:00:80
could not establish link
TFTP from server 172.16.1.133; our IP address is 172.16.1.111
Filename 'u-boot_2012.04.01.bin'.
Load address: 0x32000000
Loading: ###########################################
done
Bytes transferred = 217492 (35194 hex)
TQ2440 # protect off all
Un-Protect Flash Bank # 1
TQ2440 # erase 0 0x7ffff
Erasing sector ?0 ... ok.
Erasing sector ?1 ... ok.
Erasing sector ?2 ... ok.
Erasing sector ?3 ... ok.
Erasing sector ?4 ... ok.
Erasing sector ?5 ... ok.
Erasing sector ?6 ... ok.
Erasing sector ?7 ... ok.
Erasing sector ?8 ... ok.
Erasing sector ?9 ... ok.
Erasing sector 10 ... ok.
Erased 11 sectors
TQ2440 # cp.b 0x32000000 0 0x80000
Copy to Flash... done
TQ2440 #?
测试网卡，可以ping通。通过tftp命令将程序放到内存，再写到NOR Flash,其中这个版本u-boot写NOR Flash过程有点长，要耐心等待。上面又将
u-boot-2012.04.01烧到NOR Flash,重启u-boot-2012.04.01正常运行，测试OK
U-Boot 2012.04.01 (Oct 25 2012 - 22:47:25)
CPUID: 32440001
FCLK: ? ? ?400 MHz
HCLK: ? ? ?100 MHz
PCLK: ? ? ? 50 MHz
DRAM: ?64 MiB
WARNING: Caches not enabled
Flash: 2 MiB
NAND: ?256 MiB
In: ? ?serial
Out: ? serial
Err: ? serial
Net: ? dm9000
Hit any key to stop autoboot: ?0?
SMDK2410 #?
这只是最简版的u-boot，很多功能还不支持，但基本上可以使用了。有兴趣可以在此基础上修改。暂时发现一个bug,不能save。
