本文主要目的是如何从0编译和移植uboot,增加串口、网络、emmc等功能,让他支持exynos4412开发板。
一、移植步骤
1. Uboot配置
1.指定交叉编译工具链 进入uboot代码根目录
- $ cd u-boot-2013.01
修改 Makefile 在
- ifeq ($(HOSTARCH),$(ARCH))
- CROSS_COMPILE ?=
- endif
下添加
- ifeq (arm,$(ARCH))
- CROSS_COMPILE ?= arm-none-linux-gnueabi-
- endif
交叉编译工具
2.指定产品CPU 我们产品用的CPU是 exynos 4412;
查看u-boot源码:
- arch/arm/cpu/armv7/exynos/
可见U-boot已支持该CPU。
3.指定产品BOARD 三星公司已经为exynos 4412发布了初始化的程序:
origen
4.cpu硬件信息 对应的该CPU硬件信息头文件位于以下位置:
- include/configs/origen.h
该文件定义了uboot启动必须关于exynos 4412必须的一些资源信息。
5.boards.cfg 在uboot-2013-01中,顶层目录下的boards.cfs文件中查看它支持的开发板和相应的信息,后续的编译过程需要根据配置名检索到相应的信息。文件格式如下:
和以前的老版本比,配置更加规范化了,其实这些就是相关文件分类的一个文件夹的描述。依照这个层次关系,我们可以很方便地对我们开发板进行配置。
6.编译u-boot
不同版本的uboot的配置命令可能是不同的,源码包的文件README通常会有相应的配置命令【其他版本的uboot会不一样】:
配置和编译命令如下:
- $ make distclean
- $ make origen_config
改配置命令会生成以下文件:
- include/config.h
config.h
编译:
- $ make all
编译完成后生成的u-boot.bin就是可执行的镜像文件。
但是并不会生成真正适配我们板子的uboot,只是适配参考板,该文件还不能在我们板子上运行,我们需要对u-boot源代码进行相应的修改。
2. 确认第一条指令有运行到 (点灯法)
在arch/arm/cpu/armv7/start.S 134 行后添加点灯程序
- #if 1
- ldr r0, =0x11000c40 @GPX2_7 led2
- ldr r1, [r0]
- bic r1, r1, #0xf0000000
- orr r1, r1, #0x10000000
- str r1, [r0]
- ldr r0, =0x11000c44
- mov r1,#0xff
- str r1, [r0]
- #endif
因为uboot刚启动的时候,串口没有来得及初始化,我们可以通过点亮LED的方法来判断程序是否执行到此处。
代码详解参考《十、LED汇编、C语言驱动编写》
3. 添加三星加密方式
exynos 需要三星提供的初始引导加密后,我们的u-boot,才能被引导运行,这其中要用到下面的几个命令或三星提供的工具软件,这些操作的目的就是根据三星的芯片的启动要求对uboot.bin 进行一些处理,包括在特定长度的位置加上和校验信息以及插入一些文件段。
- $cp sdfuse_q u-boot-2013.01 -rf
- $ chmod 777 u-boot-2013.01/sdfuse_q -R
- $cp CodeSign4SecureBoot u-boot-2013.01 -rf
注:CodeSign4SecureBoot 三星提供的安全启动方式 ,对应的程序由三星提供。sdfuse_q目录下的文件是针对三星堆uboot.bin文件格式要求进行加密编写的文件。
修改根目录Makefile,实现sdfuse_q的编译 在
- $(obj)u-boot.bin: $(obj)u-boot
- $(OBJCOPY) ${OBJCFLAGS} -O binary $< $@
- $(BOARD_SIZE_CHECK)
下添加
- @#./mkuboot
- @split -b 14336 u-boot.bin bl2
- @make -C sdfuse_q/
- @#cp u-boot.bin u-boot-4212.bin
- @#cp u-boot.bin u-boot-4412.bin
- @#./sdfuse_q/add_sign
- @./sdfuse_q/chksum
- @./sdfuse_q/add_padding
- @rm bl2a*
- @echo
注意是tab键缩进的,否则makefile编译报错 注意如果执行了make distclean 需重新拷贝CodeSign4SecureBoot
为方便起见,在根目录下创建编译脚本build.sh,该脚本将自动完成添加加密方式。
- 1 #!/bin/sh
- 2
- 3 sec_path="CodeSign4SecureBoot/"
- 4 CPU_JOB_NUM=$(grep processor /proc/cpuinfo | awk '{field=$NF};END{print field+1}')
- 5 ROOT_DIR=$(pwd)
- 6 CUR_DIR=${ROOT_DIR##*/}
- 7
- 8 case "$1" in
- 9 clean)
- 10 echo make clean
- 11 make mrproper
- 12 ;;
- 13 *)
- 14
- 15 if [ ! -d $sec_path ]
- 16 then
- 17 echo "**********************************************"
- 18 echo "[ERR]please get the CodeSign4SecureBoot first"
- 19 echo "**********************************************"
- 20 return
- 21 fi
- 22
- 23 make origen_config
- 24
- 25 make -j$CPU_JOB_NUM
- 26
- 27 if [ ! -f checksum_bl2_14k.bin ]
- 28 then
- 29 echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
- 30 echo "There are some error(s) while building uboot, please use command make to check."
- 31 echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
- 32 exit 0
- 33 fi
- 34
- 35 cp -rf checksum_bl2_14k.bin $sec_path
- 36 cp -rf u-boot.bin $sec_path
- 37 rm checksum_bl2_14k.bin
- 38
- 39 cd $sec_path
- 40 cat E4412_N.bl1.SCP2G.bin bl2.bin all00_padding.bin u-boot.bin tzsw_SMDK4412_SCP_2GB.bin > u-boot-origen.bin
- 41 mv u-boot-origen.bin $ROOT_DIR
- 42
- 43 rm checksum_bl2_14k.bin
- 44 rm u-boot.bin
- 45
- 46 echo
- 47 echo
- 48 ;;
- 49
- 50 esac
编译脚本
- $ chmod 777 u-boot-2013.01/ build.sh
- $ ./buildsh
注:build.sh 脚本方式完成自动添加加密方式, 编译生成所需文件u-boot_origen.bin
- root@ubuntu:/home/peng/uboot/u-boot-2013.01# ls
- api config.mk examples Makefile sdfuse_q u-boot.bin
- arch COPYING fs mkconfig snapshot.commit u-boot.map
- board CREDITS helper.mk nand_spl spl u-boot-origen.bin
- boards.cfg disk include net System.map u-boot.srec
- build.sh doc lib post test
- CodeSign4SecureBoot drivers MAINTAINERS README tools
- common dts MAKEALL rules.mk u-boot
u-boot_origen.bin
4. 实现串口输出
修改lowlevel_init.S文件
- $vim board/samsung/origen/lowlevel_init.S
a) 添加临时栈,在
- 41 lowlevel_init:
后添加
- ldr sp,=0x02060000 @use iRom stack in bl2
b) 添加关闭看门狗代码: 在
- 67 beq wakeup_reset
后添加
- #if 1 /*for close watchdog */
- /* PS-Hold high */
- ldr r0, =0x1002330c
- ldr r1, [r0]
- orr r1, r1, #0x300
- str r1, [r0]
- ldr r0, =0x11000c08
- ldr r1, =0x0
- str r1, [r0]
- /* Clear MASK_WDT_RESET_REQUEST */
- ldr r0, =0x1002040c
- ldr r1, =0x00
- str r1, [r0]
- #endif
c) 添加串口初始化代码: 在uart_asm_init: 的
- 351 str r1, [r0, #EXYNOS4_GPIO_A1_CON_OFFSET]
后添加
- ldr r0, =0x10030000
- ldr r1, =0x666666
- ldr r2, =CLK_SRC_PERIL0_OFFSET
- str r1, [r0, r2]
- ldr r1, =0x777777
- ldr r2, =CLK_DIV_PERIL0_OFFSET
- str r1, [r0, r2]
d) 注释掉trustzone初始化 注释掉
- 104 bl uart_asm_init
下的代码:
- #if 0
- bl tzpc_init
- #endif
5. 网卡移植
因为各个厂家使用的网卡不尽相同,所以三星公司提供的驱动程序只预留了网卡初始化的函数入口,针对不同的板子,我们需要针对电路自己移植网卡的驱动。网卡的驱动详解,我们会在后一章节详细讲解。
1、 添加网络初始化代码
- $ vim board/samsung/origen/origen.c
在
- 31 struct exynos4_gpio_part2 *gpio2;
后添加:
- #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
在
- gd->bd->bi_boot_params = (PHYS_SDRAM_1 + 0x100UL);
后添加
- #ifdef CONFIG_DRIVER_DM9000
- dm9000aep_pre_init();
- #endif
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
- rc = dm9000_initialize(bis);
- #endif
- return rc;
- }
- #endif
2、 修改配置文件添加网络相关配置 $ vim include/configs/origen.h 修改
- 85 #undef CONFIG_CMD_PING
为
- #define CONFIG_CMD_PING
修改
- 90 #undef CONFIG_CMD_NET
为
- #define CONFIG_CMD_NET
在文件末尾
- #endif /* __CONFIG_H */
前面添加
- #ifdef CONFIG_CMD_NET
- #define CONFIG_NET_MULTI
- #define CONFIG_DRIVER_DM9000 1
- #define CONFIG_DM9000_BASE 0x05000000 //内存基地址
- #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 192.168.6.187
- #define CONFIG_SERVERIP 192.168.6.186
- #define CONFIG_GATEWAYIP 192.168.1.1
- #define CONFIG_NETMASK 255.255.255.0
- #endif
其中CONFIG_DM9000_BASE 地址为何是0x05000000,后续章节会详细分析。
6. FLASH移植 (EMMC)
1.移植EMMC需要添加一些源文件:
- cmd_mmc.c
- cmd_mmc_fdisk.c
- cmd_movi.c
- mmc.c
- mmc.h
- movi.c
- movi.h
- s5p_mshc.c
- s5p_mshc.h
这些文件,由三星提供。
2.添加相关驱动
- cp movi.c arch/arm/cpu/armv7/exynos/
修改文件arch/arm/cpu/armv7/exynos/Makefile在pinmux.o 后添加movi.o
修改板级文件 board/samsung/origen/origen.c,在
- #include <asm/arch/mmc.h>
后面添加
- #include <asm/arch/clk.h>
- #include "origen_setup.h"
在
- #ifdef CONFIG_GENERIC_MMC
后面添加
- u32 sclk_mmc4; /*clock source for emmc controller*/
- #define __REGMY(x) (*((volatile u32 *)(x)))
- #define CLK_SRC_FSYS __REGMY(EXYNOS4_CLOCK_BASE + CLK_SRC_FSYS_OFFSET)
- #define CLK_DIV_FSYS3 __REGMY(EXYNOS4_CLOCK_BASE + CLK_DIV_FSYS3_OFFSET)
- int emmc_init()
- {
- u32 tmp;
- u32 clock;
- u32 i;
- /* setup_hsmmc_clock */
- /* MMC4 clock src = SCLKMPLL */
- tmp = CLK_SRC_FSYS & ~(0x000f0000);
- CLK_SRC_FSYS = tmp | 0x00060000;
- /* MMC4 clock div */
- tmp = CLK_DIV_FSYS3 & ~(0x0000ff0f);
- clock = get_pll_clk(MPLL)/1000000;
- for(i=0 ; i<=0xf; i++) {
- sclk_mmc4=(clock/(i+1));
- if(sclk_mmc4 <= 160) //200
- {
- CLK_DIV_FSYS3 = tmp | (i<<0);
- break;
- }
- }
- emmcdbg("[mjdbg] sclk_mmc4:%d MHZ; mmc_ratio: %d\n",sclk_mmc4,i);
- sclk_mmc4 *= 1000000;
- /*
- * MMC4 EMMC GPIO CONFIG
- *
- * GPK0[0] SD_4_CLK
- * GPK0[1] SD_4_CMD
- * GPK0[2] SD_4_CDn
- * GPK0[3:6] SD_4_DATA[0:3]
- */
- writel(readl(0x11000048)&~(0xf),0x11000048); //SD_4_CLK/SD_4_CMD pull-down enable
- writel(readl(0x11000040)&~(0xff),0x11000040);//cdn set to be output
- writel(readl(0x11000048)&~(3<<4),0x11000048); //cdn pull-down disable
- writel(readl(0x11000044)&~(1<<2),0x11000044); //cdn output 0 to shutdown the emmc power
- writel(readl(0x11000040)&~(0xf<<8)|(1<<8),0x11000040);//cdn set to be output
- udelay(100*1000);
- writel(readl(0x11000044)|(1<<2),0x11000044); //cdn output 1
- writel(0x03333133, 0x11000040);
- writel(0x00003FF0, 0x11000048);
- writel(0x00002AAA, 0x1100004C);
- #ifdef CONFIG_EMMC_8Bit
- writel(0x04444000, 0x11000060);
- writel(0x00003FC0, 0x11000068);
- writel(0x00002AAA, 0x1100006C);
- #endif
- #ifdef USE_MMC4
- smdk_s5p_mshc_init();
- #endif
- }
将 int board_mmc_init(bd_t *bis)函数内容改写为
- int board_mmc_init(bd_t *bis)
- {
- int i, err;
- #ifdef CONFIG_EMMC
- err = emmc_init();
- #endif
- return err;
- }
在末尾添加
- #ifdef CONFIG_BOARD_LATE_INIT
- #include <movi.h>
- int chk_bootdev(void)//mj for boot device check
- {
- char run_cmd[100];
- struct mmc *mmc;
- int boot_dev = 0;
- int cmp_off = 0x10;
- ulong start_blk, blkcnt;
- mmc = find_mmc_device(0);
- if (mmc == NULL)
- {
- printf("There is no eMMC card, Booting device is SD card\n");
- boot_dev = 1;
- return boot_dev;
- }
- start_blk = (24*1024/MOVI_BLKSIZE);
- blkcnt = 0x10;
- sprintf(run_cmd,"emmc open 0");
- run_command(run_cmd, 0);
- sprintf(run_cmd,"mmc read 0 %lx %lx %lx",CFG_PHY_KERNEL_BASE,start_blk,blkcnt);
- run_command(run_cmd, 0);
- /* switch mmc to normal paritition */
- sprintf(run_cmd,"emmc close 0");
- run_command(run_cmd, 0);
- return 0;
- }
- int board_late_init (void)
- {
- int boot_dev =0 ;
- char boot_cmd[100];
- boot_dev = chk_bootdev();
- if(!boot_dev)
- {
- printf("\n\nChecking Boot Mode ... EMMC4.41\n");
- }
- return 0;
- }
- #endif
3.添加相关命令
- $ cp cmd_movi.c common/
- $ cp cmd_mmc.c common/
- $ cp cmd_mmc_fdisk.c common/
修改common/Makefile 在
- COBJS-$(CONFIG_CMD_MMC) += cmd_mmc.o
后添加
- COBJS-$(CONFIG_CMD_MMC) += cmd_mmc_fdisk.o
- COBJS-$(CONFIG_CMD_MOVINAND) += cmd_movi.o
添加驱动
- $ cp mmc.c drivers/mmc/
- $ cp s5p_mshc.c drivers/mmc/
- $ cp mmc.h include/
- $ cp movi.h include/
- $ cp s5p_mshc.h include/
修改Makefile
- $vim drivers/mmc/Makefile
添加
- COBJS-$(CONFIG_S5P_MSHC) += s5p_mshc.o
4.添加EMMC相关配置
- $vim include/configs/origen.h
添加
- #define CONFIG_EVT1 1 /* EVT1 */
- #ifdef CONFIG_EVT1
- #define CONFIG_EMMC44_CH4 //eMMC44_CH4 (OMPIN[5:1] = 4)
- #ifdef CONFIG_SDMMC_CH2
- #define CONFIG_S3C_HSMMC
- #undef DEBUG_S3C_HSMMC
- #define USE_MMC2
- #endif
- #ifdef CONFIG_EMMC44_CH4
- #define CONFIG_S5P_MSHC
- #define CONFIG_EMMC 1
- #define USE_MMC4
- /* #define CONFIG_EMMC_8Bit */
- #define CONFIG_EMMC_EMERGENCY
- /*#define emmcdbg(fmt,args...) printf(fmt ,##args) *///for emmc debug
- #define emmcdbg(fmt,args...)
- #endif
- #endif /*end CONFIG_EVT1*/
- #define CONFIG_CMD_MOVINAND
- #define CONFIG_CLK_1000_400_200
- #define CFG_PHY_UBOOT_BASE CONFIG_SYS_SDRAM_BASE + 0x3e00000
- #define CFG_PHY_KERNEL_BASE CONFIG_SYS_SDRAM_BASE + 0x8000
- #define BOOT_MMCSD 0x3
- #define BOOT_EMMC43 0x6
- #define BOOT_EMMC441 0x7
- #define CONFIG_BOARD_LATE_INIT
7. 重新编译u-boot
修改顶层Makefile,注释掉spl的编译:
- 623 #$(obj)spl/u-boot-spl.bin: $(SUBDIR_TOOLS) depend
- 624 # $(MAKE) -C spl all
重新编译uboot:
- $ ./build.sh
在根目录下会生成bin文件u-boot-origen.bin。
二、SD卡制作
1. 烧写脚本
三星公司已经给我们提供了制作SD卡启动的烧写的脚本:mkuboot.sh
- #!/bin/bash
- #
- # This script will create a u-boot binary for movinand/mmc boot
- #
- echo "Fuse FS4412 trustzone uboot file into SD card"
- if [ -z $1 ] #判断参数1的字符串是否为空,如果为空,则打印出帮助信息
- then
- ./sd_fusing_exynos4x12.sh /dev/sdb u-boot-origen.bin
- else
- ./sd_fusing_exynos4x12.sh $1 u-boot-origen.bin
- fi
sd_fusing_exynos4x12.sh
- 1 #!/bin/sh
- 2 #
- 3 # Copyright (C) 2010 Samsung Electronics Co., Ltd.
- 4 # http://www.samsung.com/
- 5 #
- 6 # This program is free software; you can redistribute it and/or modify
- 7 # it under the terms of the GNU General Public License version 2 as
- 8 # published by the Free Software Foundation.
- 9 #
- 10 ####################################
- 11 reader_type1="/dev/sd"
- 12 reader_type2="/dev/mmcblk0"
- 13
- 14 if [ -z $2 ] #判断参数2的字符串是否为空,如果为空,则打印出帮助信息
- 15 then
- 16 echo "usage: ./sd_fusing.sh <SD Reader's device file> <filename>"
- 17 exit 0
- 18 fi
- 19
- 20 param1=`echo "$1" | awk '{print substr($1,1,7)}'`
- 21
- 22 if [ "$param1" = "$reader_type1" ]
- 23 then
- 24 partition1=$1"1"
- 25 partition2=$1"2"
- 26 partition3=$1"3"
- 27 partition4=$1"4"
- 28
- 29 elif [ "$1" = "$reader_type2" ]
- 30 then
- 31 partition1=$1"p1"
- 32 partition2=$1"p2"
- 33 partition3=$1"p3"
- 34 partition4=$1"p4"
- 35
- 36 else
- 37 echo "Unsupported SD reader"
- 38 exit 0
- 39 fi
- 40
- 41 if [ -b $1 ] #判断参数1所指向的设备节点是否存在
- 42 then
- 43 echo "$1 reader is identified."
- 44 else
- 45 echo "$1 is NOT identified."
- 46 exit 0
- 47 fi
- 48
- 49 ####################################
- 50 # format
- 51 umount $partition1 2> /dev/null
- 52 umount $partition2 2> /dev/null
- 53 umount $partition3 2> /dev/null
- 54 umount $partition4 2> /dev/null
- 55
- 56 echo "$2 fusing..."
- # 烧写u-boot-origen.bin到SD卡(512+8K)字节处, 512+8K=17x512,即第17个block
- 57 dd iflag=dsync oflag=dsync if=$2 of=$1 seek=1 && \
- 58 echo "$2 image has been fused successfully."
- 59
- 60 #echo "zImage fusing..."
- 61 #dd iflag=dsync oflag=dsync if=../../TC4_Kernel_3.0/arch/arm/boot/zImage of=$1 seek=1024 && \
- 62 # echo "zImage has been fused successfully."
- 63
- 64 #echo "ramdisk-uboot.img fusing..."
- 65 #dd iflag=dsync oflag=dsync if=../../TC4_GB_2.3.4/out/target/product/smdk4212/ramdisk-uboot.img of=$1 seek=9216 && \
- 66 # echo "ramdisk-uboot.img has been fused successfully."
- 67
- 68 ####################################
- 69 #<Message Display>
- 70 echo "Eject SD card"
- 71
2. 制作步骤
a) 创建文件mkuboot.sh、sd_fusing_exynos4x12.sh b) 将SD卡插入电脑并被ubuntu识别 c) 拷贝编译好u-boot-origen.bin拷贝到当前目录下
- root@ubuntu:/home/peng/uboot/sdfuse_q# ls
- mkuboot.sh sd_fusing_exynos4x12.sh u-boot-origen.bin
d) 进入sdfuse_q执行如下操作
- root@ubuntu:/home/peng/uboot/sdfuse_q#./mkuboot.sh /dev/sdb
d) 在SD卡中创建目录sdupdate,并把编译好的uboot镜像文件u-boot-origen.bin拷贝到这个目录。
3. 通过sd卡启动烧写uboot
a) 连接串口和板子,运行串口通信程序putty
选择右上角的”Serial”,然后点击左下角的”Serial”
按照自己的主机的情况选择COM口其他必须一直,然后点击open打开串口
b) 关闭开发板电源,将拨码开关SW1调至(1000)(SD启动模式)后打开电源 c) 将刚才做好的SD启动盘插入SD卡插槽 d) 重新打开开发板能够看到如下界面
在这里插入图片描述
在读秒倒计时时按任意键。由上图所示,已经支持EMMC和dm9000网卡。
e) 烧写 在终端上执行
- sdfuse flashall
注意:上面的命令把SD卡 sdupdate目录下的u-boot-origen.bin烧写到emmc起始位置 等待终端无输出是表示烧写结束
f) 关闭开发板电源,将拨码开关SW1调至0110(EMMC启动模式)后打开电源即可以从emmc启动
4. 网络烧写uboot
如果板子已经可以启动uboot,我们也可以通过网络烧写uboot。
步骤如下:
把编译好的u-boot-origen.bin拷贝到/tftpboot下
启动开发板,在u-boot下先下载u-boot-origen.bin到41000000;再运行
- movi write u-boot 41000000
若编译后的u-boot-origen.bin 无法运行,可参考上一节,重新从SD卡引导烧写。