【ecos学习5】redboot 加载运行hello world

背景：

从主机 192.168.2.14 IP，下载bin文件hello到ecos。

redboot>load -v -h 192.168.2.14 hello

Using default protocol (TFTP)

Entry point : 0x00108000,adress range :0x00108000-0x00136500

以上提示表示需要输入存放hello的起始地址

redboot>load -v -h 192.168.2.14 -b 0x00108000 hello

Using default protocol (TFTP)

Entry point : 0x00108000,adress range :0x00108000-0x00136500

不知为何这样提示，但用go测试是否下载成功hello

go 0x00108000

Hello, eCos world!已打印出来了

成功下载，执行。

如果提示：

"Unrecognized image type: 0x01080000"

解决方案原文引用：

Today I visited friend at his office and during talk I found dusted EDB9301 board at shelve. As he do not use it any more I was allowed to take it for experimenting.

First problem was bootloader — I am not so familiar with RedBoot so it took me a while to get it to load kernel from TFTP server. For reference: proper command is "load -v -r -b 0x01000000 /zImage-ep9301" where “/zImage-ep9301″ is name of file to fetch. If you will get “Unrecognized image type: 0xe1a00000″ message instead then you forgot “-r” switch (RedBoot do not know format of zImage kernel). I got some hints from HitchHacker Guide to ENP-2611 page.

解决方案：

load -r

完整的load语句：

redboot>load -v -r -h 192.168.2.14 -b 0x00108000 hello

Raw file loaded 0x00108000-0x0121159,assumed entry at 0x00108000.

-v 显示加载过程

-r 加载纯数据，如果出现该选项，必须使用-b选项

-b 指定文件加载的起始位置

-h 用于加载的主机名，只用于TFTP方式,还可以用ip指定主机，则load语句不需要带-h选项

ip -l 192.168.2.14 -h 192.168.2.16

IP:192.168.2.14/255.255.0.0,Gateway:192.168.1.1

Default server:192.168.2.16

-l 设定本机IP

-h 设定远程TFTP主机IP

之后直接执行

redboot>load -v -r -b 0x00108000 hello 

经过测试发现：

0x01008000是ecos的起始地址。

go 0x01008000

将重启redboot ，每次都不同，但是占此地址的机率大一些

参考资料：

http://marcin.juszkiewicz.com.pl/2009/04/15/edb9301-hacking/