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研发客服6.3）重新编译，烧写，运行
U-Boot 2010.03 (Sep 10 2014 - 23:39:40) for SMDK6410
CPU: S3C6410@533MHz
Fclk = 533MHz, Hclk = 133MHz, Pclk = 66MHz (ASYNC Mode)
Board: SMDK6410
DRAM: 256 MB
Flash: 0 kB
NAND: 2048 MiB
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Net: dm9000
Hit any key to stop autoboot: 0
网卡信息显示正确。
6.4）测试网卡功能
将上位机与开发板用网线相连，上位机IP设为192.168.1.88，将iptables服务关掉。
开发板ping上位机
SMDK6410 # ping 192.168.1.88
dm9000 i/o: 0x18000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:90:90:90:90:90
operating at 100M full duplex mode
Using dm9000 device
host 192.168.1.88 is alive
SMDK6410 #
ok，可以ping通。
再来测试一下tftp功能
SMDK6410 # tftp 0x50000000 led.bin
dm9000 i/o: 0x18000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:90:90:90:90:90
operating at 100M full duplex mode
Using dm9000 device
TFTP from server 192.168.1.88; our IP address is 192.168.1.230
Filename 'led.bin'.
Load address: 0x50000000
Loading: T #
done
Bytes transferred = 236 (ec hex)
SMDK6410 #
tftp可以正常使用。
7.引导linux镜像
用bootm命令启动一个内核镜像时，需要用工具mkimage给内核镜像文件打个头部。
[root@tanghuimin u-boot-2010.03]# cp /opt/FriendlyARM/images/Linux/zImage_n43 tools/
[root@tanghuimin u-boot-2010.03]# cd tools/
[root@tanghuimin tools]# ./mkimage -n 'linux-2.6.38' -A arm -O linux -T kernel -C none -a 0x50008000 -e 0x50008040 -d zImage_n43 uImage.img
Image Name: linux-2.6.38
Created: Wed Sep 10 23:49:07 2014
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 3763192 Bytes = 3674.99 kB = 3.59 MB
Load Address: 50008000
Entry Point: 50008040
[root@tanghuimin tools]#
zImage_n43为现成的内核镜像文件，uImage.img为打了特定头部的内核镜像文件。
把内核镜像下载到sdram的地址0x50008000处，并用bootm命令启动内核。
SMDK6410 # tftp 0x50008000 uImage.img
dm9000 i/o: 0x18000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:90:90:90:90:90
operating at 100M full duplex mode
Using dm9000 device
TFTP from server 192.168.1.88; our IP address is 192.168.1.230
Filename 'uImage.img'.
Load address: 0x50008000
Loading: #################################################################
#################################################################
#################################################################
##############################################################
done
Bytes transferred = 3763256 (396c38 hex)
SMDK6410 #
SMDK6410 # bootm 0x50008000
## Booting kernel from Legacy Image at 50008000 ...
Image Name: linux-2.6.38
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 3763192 Bytes = 3.6 MB
Load Address: 50008000
Entry Point: 50008040
Verifying Checksum ... OK
XIP Kernel Image ... OK
OK
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
Initializing cgroup subsys cpu
Linux version 2.6.38-FriendlyARM (root@jensen) (gcc version 4.5.1 (ctng-1.8.1-FA) ) #7 PREEMPT Fri Mar 25 14:40:21 HKT 2011
CPU: ARMv6-compatible processor [410fb766] revision 6 (ARMv7), cr=00c5387f
CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
Machine: MINI6410
Memory policy: ECC disabled, Data cache writeback
...
...
...
成功。
8）u-boot调试
8.1）在串口初始化程序执行之后，可用“printf”打印调试信息；
8.2）在串口初始化程序执行之前，我们无法通过printf来打印调试信息，当启动u-boot，串口没有任何输出时，怎样判断程序到底走到哪一步了呢？如下是亮灯的程序，根据需要在汇编代码中插入如下程序段，如果程序走到了这一步，则四盏led灯亮起，否则不亮。
#if 1
ldr r0, =0x70000000
orr r0, r0, #0x13
mcr p15,0,r0,c15,c2,4
ldr r1, =0x7f008800
ldr r0, =0x11110000
str r0, [r1]
ldr r1, =0x7f008808
mov r0, #0
str r0, [r1]
#endif
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