1.在 arch/arm/cpu/armv7/start.S 文件中添加点灯代码： /* led3 init */ ldr r0, =0x11000c20 ldr r1, [r0] bic r1, #0xf orr r1, #0x1 str r1, [r0] /* led3 on */ ldr r0, =0x11000c24 ldr r1, [r0] orr r1, #0x1 str r1, [r0] 2.添加电源管理相关代码，关闭看门狗, arch/arm/cpu/armv7/start.S中添加 /*for close watchdog */ /* PS-Hold high */ ldr r0, =0x1002330c /*PS_HOLD_CONTROL*/ ldr r1, [r0] orr r1, r1, #0x300 str r1, [r0] ldr r0, =0x11000c08 ldr r1, =0x0 /*Disables Pull-up/Pull-down*/ str r1, [r0] /* Clear MASK_WDT_RESET_REQUEST */ ldr r0, =0x1002040c ldr r1, =0x00 str r1, [r0] 3.添加串口时钟初始化代码：board/samsung/fs4412/lowlevel_init.S 在串口初始化代码中的 str r1, [r0, #EXYNOS4_GPIO_A1_CON_OFFSET] 后面添加 /* 串口相关的时钟初始化 */ ldr r0, =EXYNOS4_CLOCK_BASE /* UART[0:4] */ ldr r1, =CLK_SRC_PERIL0_VAL ldr r2, =CLK_SRC_PERIL0_OFFSET str r1, [r0, r2] /* CLK_DIV_PERIL0: UART Clock Divisors */ ldr r1, =CLK_DIV_PERIL0_VAL ldr r2, =CLK_DIV_PERIL0_OFFSET str r1, [r0, r2] 禁用trustzone技术, 把串口初始化后面的 bl tzpc_init 屏蔽掉 @ bl tzpc_init 4.将网卡驱动必要的初始化代码加入合适位置 4.1网卡驱动和相关命令 board/samsung/fs4412/fs4412.c（origen.c） 在struct exynos4_gpio_part2 *gpio2; 后添加以下内容: #ifdef CONFIG_DRIVER_DM9000 #define EXYNOS4412_SROMC_BASE 0X12570000 #define DM9000_Tacs (0x1) #define DM9000_Tcos (0x1) #define DM9000_Tacc (0x5) #define DM9000_Tcoh (0x1) #define DM9000_Tah (0xC) #define DM9000_Tacp (0x9) #define DM9000_PMC (0x1) struct exynos_sromc { unsigned int bw; unsigned int bc[6]; }; /* * s5p_config_sromc() - select the proper SROMC Bank and configure the * band width control and bank control registers * srom_bank - SROM * srom_bw_conf - SMC Band witdh reg configuration value * srom_bc_conf - SMC Bank Control reg configuration value */ void exynos_config_sromc(u32 srom_bank, u32 srom_bw_conf, u32 srom_bc_conf) { unsigned int tmp; struct exynos_sromc *srom = (struct exynos_sromc *)(EXYNOS4412_SROMC_BASE); /* Configure SMC_BW register to handle proper SROMC bank */ tmp = srom->bw; tmp&= ~(0xF << (srom_bank * 4)); tmp |= srom_bw_conf; srom->bw = tmp; /* Configure SMC_BC register */ srom->bc[srom_bank] = srom_bc_conf; } static void dm9000aep_pre_init(void) { unsigned int tmp; unsigned char smc_bank_num = 1; unsigned int smc_bw_conf=0; unsigned int smc_bc_conf=0; /* gpio configuration */ writel(0x00220020, 0x11000000 + 0x120); writel(0x00002222, 0x11000000 + 0x140); /* 16 Bit bus width */ writel(0x22222222, 0x11000000 + 0x180); writel(0x0000FFFF, 0x11000000 + 0x188); writel(0x22222222, 0x11000000 + 0x1C0); writel(0x0000FFFF, 0x11000000 + 0x1C8); writel(0x22222222, 0x11000000 + 0x1E0); writel(0x0000FFFF, 0x11000000 + 0x1E8); smc_bw_conf &= ~(0xf<<4); smc_bw_conf |= (1<<7) | (1<<6) | (1<<5) | (1<<4); smc_bc_conf = ((DM9000_Tacs << 28) | (DM9000_Tcos << 24) | (DM9000_Tacc << 16) | (DM9000_Tcoh << 12) | (DM9000_Tah << 8) | (DM9000_Tacp << 4) | (DM9000_PMC)); exynos_config_sromc(smc_bank_num,smc_bw_conf,smc_bc_conf); } #endif 4.2在gd->bd->bi_boot_params = (PHYS_SDRAM_1 + 0x100UL); 后添加以下内容 #ifdef CONFIG_DRIVER_DM9000 /*根据dm9000网卡的参数初始化外扩EBI总线（位宽等匹配）*/ dm9000aep_pre_init(); #endif 4.3在文件末尾添加 #ifdef CONFIG_CMD_NET int board_eth_init(bd_t *bis) { int rc = 0; #ifdef CONFIG_DRIVER_DM9000 /*网卡初始化代码的调用*/ rc = dm9000_initialize(bis); #endif return rc; } #endif 4.4修改 checkboard 函数内的打印信息, 即u-boot的启动信息, 可根据自己需求来修改 int checkboard (void) { printf("\nBoard: FS4412\n"); return 0; } 5.在头文件中定义必要的宏决定哪些驱动或命令想要编入uboot（fs4412.h） vim include/configs/fs4412.h 修改 #undef CONFIG_CMD_PING 为 #define CONFIG_CMD_PING 修改 #undef CONFIG_CMD_NET 为 #define CONFIG_CMD_NET 在文件末尾 #endif /* __CONFIG_H */ [前面]添加以下内容: #ifdef CONFIG_CMD_NET #define CONFIG_NET_MULTI #define CONFIG_DRIVER_DM9000 1 #define CONFIG_DM9000_BASE 0x05000000 #define DM9000_IO CONFIG_DM9000_BASE #define DM9000_DATA (CONFIG_DM9000_BASE + 4) #define CONFIG_DM9000_USE_16BIT #define CONFIG_DM9000_NO_SROM 1 #define CONFIG_ETHADDR 11:22:33:44:55:66 #define CONFIG_IPADDR 192.168.22.123 #define CONFIG_SERVERIP 192.168.22.111 #define CONFIG_GATEWAYIP 192.168.22.1 #define CONFIG_NETMASK 255.255.255.0 #endif 修改u-boot启动后的输出信息, 可以根据自己需求来修改, 104行 #define CONFIG_SYS_PROMPT "FS4412 # " 环境变量位置说明 #define CONFIG_ENV_OFFSET (232 << 10) 修改环境参数保存位置, 不修改的话会造成环境变量保存位置错误 #define BL1_SIZE (516 << 10) //因为我们的 myuboot_sd.img 文件是516k的, 所以将16改为516