s3c6410_u-boot-2010.03移植【续】

本文接上一篇：http://www.cnblogs.com/tanghuimin0713/p/3965528.html

6.3）重新编译，烧写，运行

U-Boot 2010.03 (Sep   - ::) for SMDK6410

CPU:     S3C6410@533MHz
         Fclk = 533MHz, Hclk = 133MHz, Pclk = 66MHz (ASYNC Mode)
Board:   SMDK6410
DRAM:   MB
Flash:   kB
NAND:   MiB
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   dm9000
Hit any key to stop autoboot:   

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  bit mode
MAC: :::::
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  bit mode
MAC: :::::
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 =  (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.
Created:      Wed Sep  ::
Image Type:   ARM Linux Kernel Image (uncompressed)
Data Size:     Bytes = 3674.99 kB = 3.59 MB
Load Address:
Entry Point:
[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  bit mode
MAC: :::::
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 =  (396c38 hex)
SMDK6410 # 

SMDK6410 # bootm 0x50008000
## Booting kernel from Legacy Image at  ...
   Image Name:   linux-2.6.
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:     Bytes =  3.6 MB
   Load Address:
   Entry Point:
   Verifying Checksum ... OK
   XIP Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Initializing cgroup subsys cpu
Linux version 2.6.-FriendlyARM (root@jensen) (gcc version 4.5. (ctng-1.8.-FA) ) # PREEMPT Fri Mar  :: HKT
CPU: ARMv6-compatible processor [410fb766] revision  (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,,r0,c15,c2, 

ldr r1, =0x7f008800
ldr r0, =0x11110000
str r0, [r1] 

ldr r1, =0x7f008808
mov r0, #
str r0, [r1]
#endif