1、修改完Makefile后,在board目录下,新建自己的开发板目录TX2440,把smdk2410目录下的所有文件拷到TX2440,把smdk2410.c改为TX2440.c。修改该目录下的Makefile,把smdk2410.o改为TX2410.o。COBJS := TX2440.o flash.o将board目录下所有文件夹全部删除,只留TX2440在include/configs目录下创建 板子的配置头文件,把smdk2410.h改名为TX2440.h,再把所有的文件全部删除,只留TX2440.h测试能否编译成功:执行make TX2440_config出现make: execvp: /
2、mkconfig: 权限不够查看mkconfig的权限,发现没有可执行权限,用chmod 764 mkconfig加上权限然后再make,成功后可出现 Configuring for TX2440 board.修改SDRAM配置,在board/TX2440/lowlevel_init.S中,检查#define B6_BWSCON (DW32) 位宽为32把B1_BWSCON 改为(DW16) B5_BWSCON 改为(DW8)根据HCLK设置SDRAM 的刷新参数,主要是REFCNT寄存器,开发板HCLK为100M将 #define REFCNT 0x1113 改为 #define REFCN
3、T 0x4f4增加对S3C2440的支持,2440的时钟计算公式、NAND操作和2410不太一样。对于2440开发板,将FCLK设为400MHz,分频比为FCLK:HCLK:PCLK=1:4:8。修改board/TX2440/TX2440.c中的board_init函数/* S3C2440: Mpll,Upll = (2*m * Fin) / (p * 2s) * m = M (the value for divider M)+ 8, p = P (the value for divider P) + 2 */#define S3C2440_MPLL_400MHZ (0x7f12)|(0x02
4、4)|(0x01)#define S3C2440_UPLL_48MHZ (0x384)|(0x02)#define S3C2440_CLKDIV 0x05 /* FCLK:HCLK:PCLK = 1:4:8 */* S3C2410: Mpll,Upll = (m * Fin) / (p * 2s)#define S3C2410_MPLL_200MHZ (0x5c12)|(0x044)|(0x00)#define S3C2410_UPLL_48MHZ (0x2812)|(0x01GPACON = 0x007FFFFF;GPBCON = 0x00044555;GPBUP = 0x000007FF;
5、GPCCON = 0xAAAAAAAA;GPCUP = 0x0000FFFF;GPDCON = 0xAAAAAAAA;GPDUP = 0x0000FFFF;GPECON = 0xAAAAAAAA;GPEUP = 0x0000FFFF;GPFCON = 0x000055AA;GPFUP = 0x000000FF;GPGCON = 0xFF95FFBA;GPGUP = 0x0000FFFF;GPHCON = 0x002AFAAA;GPHUP = 0x000007FF; /*support both of S3C2410 and S3C2440*/ if (gpio-GSTATUS1 = 0x324
6、10000) | (gpio-GSTATUS1 = 0x32410002) /*FCLK:4*/ clk_power-CLKDIVN = S3C2410_CLKDIV; /* change to asynchronous bus mod */ _asm_( mrc p15, 0, r1, c1, c0, 0/n /* read ctrl register */ orr r1, r1, #0xc0000000/n /* Asynchronous */ mcr p15, 0, r1, c1, c0, 0/n /* write ctrl register */ :r1 ); /* to reduce
7、 PLL lock time, adjust the LOCKTIME register */LOCKTIME = 0xFFFFFF; /* configure MPLL */MPLLCON = S3C2410_MPLL_200MHZ; /* some delay between MPLL and UPLL */ delay (4000); /* configure UPLL */UPLLCON = S3C2410_UPLL_48MHZ; delay (8000); /* arch number of SMDK2410-Board */ gd-bd-bi_arch_number = MACH_
8、TYPE_SMDK2410; else /* FCLK:CLKDIVN = S3C2440_CLKDIV;MPLLCON = S3C2440_MPLL_400MHZ;UPLLCON = S3C2440_UPLL_48MHZ; /* arch number of SMDK2440-Board */bi_arch_number = MACH_TYPE_S3C2440; /* adress of boot parameters */bi_boot_params = 0x30000100; icache_enable(); dcache_enable(); return 0;在cpu/arm920t/
9、s3c24X0/speed.c中修改:在程序开头增加一行DECLARE_GLOBAL_DATA_PTR;,这样才可以使用gd变量修改get_PLLCLK函数:static ulong get_PLLCLK(int pllreg) ulong r, m, p, s; if (pllreg = MPLL) r = clk_power-MPLLCON; else if (pllreg = UPLL)UPLLCON; hang(); m = (r & 0xFF000) 12) + 8; p = (r & 0x003F0) 4) + 2; s = r & 0x3; /* support both of
10、S3C2410 and S3C2440 */ if (gd-bi_arch_number = MACH_TYPE_SMDK2410) return(CONFIG_SYS_CLK_FREQ * m) / (p s); return(CONFIG_SYS_CLK_FREQ * m * 2) / (p /* S3C2440*/修改get_HCLK, get_PCLK:/* for s3c2440 */#define S3C2440_CLKDIVN_PDIVN (10)#define S3C2440_CLKDIVN_HDIVN_MASK (31)#define S3C2440_CLKDIVN_HDIV
11、N_1 (0#define S3C2440_CLKDIVN_HDIVN_2 (1#define S3C2440_CLKDIVN_HDIVN_4_8 (2#define S3C2440_CLKDIVN_HDIVN_3_6 (3#define S3C2440_CLKDIVN_UCLK (13)#define S3C2440_CAMDIVN_CAMCLK_MASK (0xf#define S3C2440_CAMDIVN_CAMCLK_SEL (14)#define S3C2440_CAMDIVN_HCLK3_HALF (18)#define S3C2440_CAMDIVN_HCLK4_HALF (1
12、9)#define S3C2440_CAMDIVN_DVSEN (1CLKDIVN & 0x2) ? get_FCLK()/2 : get_FCLK(); 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; case
13、 S3C2440_CLKDIVN_HDIVN_4_8: hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4; case S3C2440_CLKDIVN_HDIVN_3_6: S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3; return get_FCLK() / hdiv;/* return PCLK frequency */ulong get_PCLK(void) 0x1) ? get_HCLK()/2 : get_HCLK(); return get_FCLK() / hdiv / (clkdiv & S3C24
14、40_CLKDIVN_PDIVN)? 2:1); 重新执行make TX2440_config make all 生成u-boot.bin,由于还没有增加NAND Flash的支持,所以可烧入NOR Flash中运行在make all时会出现错误:没有CAMDIVN这个要在include/s3c24x0.h中定义, 在129行S3C24X0_CLOCK_POWER结构体中增加:S3C24X0_REG32 CAMDIVN; /* for s3c2440*/支持NAND Flash首先在配置文件include/configs/TX2440.h的宏CONFIG_COMMANDS中增加CFG_CMD_
15、NAND (大概在82行)编译,出现nand.c的错误和警告解决:在include/configs/TX2440.h的最后面增加3个宏:/*NAND flash settings*/#define CFG_NAND_BASE 0 /无实际意义:基地址,在board_nand_init中重新定义#define CFG_MAX_NAND_DEVICE 1 /NAND Flash设备数目为1#define NAND_MAX_CHIPS 1 /每个NAND设备由1个NADN芯片组成修改配置文件后再编译,只有一个错误了“board_nand_init”函数未定义board_nand_init需要自己编写
16、,在cpu/arm920t/s3c24x0下新建nand_flash.c编写之前,需要针对S3C2440 NAND Flash定义一些数据结构和函数在include/s3c24x0.h中增加S3C2440_NAND数据结构 (168行 )/* NAND FLASH (see S3C2440 manual chapter 6) */typedef struct S3C24X0_REG32 NFCONF; S3C24X0_REG32 NFCONT; S3C24X0_REG32 NFCMD; S3C24X0_REG32 NFADDR; S3C24X0_REG32 NFDATA; S3C24X0_RE
17、G32 NFMECCD0; S3C24X0_REG32 NFMECCD1; S3C24X0_REG32 NFSECCD; S3C24X0_REG32 NFSTAT; S3C24X0_REG32 NFESTAT0; S3C24X0_REG32 NFESTAT1; S3C24X0_REG32 NFMECC0; S3C24X0_REG32 NFMECC1; S3C24X0_REG32 NFSECC; S3C24X0_REG32 NFSBLK; S3C24X0_REG32 NFEBLK; /*_attribute_(_packed_)*/ S3C2440_NAND;在include/s3c2410.h
18、中仿照S3C2410_GetBase_NAND函数(96行)定义2440的函数:static inline S3C2440_NAND * const S3C2440_GetBase_NAND(void) return (S3C2440_NAND * const)S3C2410_NAND_BASE;在cpu/arm920t/s3c24x0/nand_flash.c中添加代码,是从Linux-2.6.13中/drivers/mtd/nand/s3c2410.c中移植过来的,代码略。修改cpu/arm920t/s3c24x0/Makefile:COBJS = 加上一项nand_flash.o编译后生
19、成uboot镜像,但这里注意,现在还不支持NAND FLASH启动,只能烧到NOR FLASH中。要支持NAND FLASH启动,要修改cpu/arm920t/start.S,还要编写nand启动函数,这里先不考虑,复制现成的代码过来,以后再说。支持网卡芯片DM9000在driver下,有网卡驱动DM9000x.c 和 DM9000x.hDM9000接在BANK4,位宽16在include/configs/TX2440.h中设置网卡基地址:在56行处,将CS8900的定义改成:#define CONFIG_DRIVER_DM9000 1#define CONFIG_DM9000_BASE 0x
20、20000300#define DM9000_IO CONFIG_DM9000_BASE#define DM9000_DATA (CONFIG_DM9000_BASE + 4)#define CONFIG_DM9000_USE_16BIT在drivers目录下,只留nand nand_legacy dm9000x.c dm9000x.h Makefile其他文件全部删除,修改Makefile: COBJS = dm9000x.o修改顶层目录的Makefile:将209行的内容LIBS += drivers/sk98lin/libsk98lin.a 删除可以将顶层目录下没用的lib_x 文件夹删除,只留lib_arm lib_generic编译可生成支持网卡的uboot设置Linux启动参数在77行处,加两个宏定义:/* for tag(s) to transfer message to kernel*/#define CONFIG_SETUP_MEMORY_TAGS 1#define CONFIG_CMDLINE_TAG 1在#include cmd_confde
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