U-BOOT引导UCOS2

为什么这么做呢？源于虚荣心吧，不过更多的是方便！

设想方案：

方案A：如同引导Linux那样引导ucos,1:使用mkimage加工一下2：tftp下载3：bootm 实施-mkimage使用方法：

Usage: mkimage -l image
              -l ==> list image header information
           mkimage [-x] -A arch -O os -T type -C comp -a addr -e ep -n name -d data_file[:data_file...] image
              -A ==> set architecture to 'arch'
              -O ==> set operating system to 'os'
              -T ==> set image type to 'type'
              -C ==> set compression type 'comp'
              -a ==> set load address to 'addr' (hex)
              -e ==> set entry point to 'ep' (hex)
              -n ==> set image name to 'name'
              -d ==> use image data from 'datafile'
              -x ==> set XIP (execute in place)
           mkimage [-D dtc_options] -f fit-image.its fit-image

建立shell脚本mkimage-sh：

#/bin/bash
    mkimage -n 'kangear' -A arm -O ucos -T kernel -C none -a 0x30008000 -e 0x30008040 -d $1 $2

运行结果：

[root@localhost uCos2]# ./mkimage-sh 2440ucos2_W35.bin 2440ucos2_W35.img
    Invalid OS Type - valid names are: linux, lynxos, netbsd, rtems, u-boot, qnx, vxworks, integrity, 4_4bsd, dell, esix, freebsd, irix, ncr, openbsd, psos, sco, solaris, svr4
    Usage: mkimage -l image
              -l ==> list image header information
           mkimage [-x] -A arch -O os -T type -C comp -a addr -e ep -n name -d data_file[:data_file...] image
              -A ==> set architecture to 'arch'
              -O ==> set operating system to 'os'
              -T ==> set image type to 'type'
              -C ==> set compression type 'comp'
              -a ==> set load address to 'addr' (hex)
              -e ==> set entry point to 'ep' (hex)
              -n ==> set image name to 'name'
              -d ==> use image data from 'datafile'
              -x ==> set XIP (execute in place)
           mkimage [-D dtc_options] -f fit-image.its fit-image

在U-BOOT支持的OS列表中并没有ucos，uCLinux看来这种方法行不通了。不过额外收获是OS里边居然有U-BOOT，那就说明把U-BOOT用mkimage加工一下也就可以用U-BOOT启动U-BOOT了。

方案B：直接下载，然后用go命令

1.下载ucos2

[u-boot@MINI2440]# tftp 2440ucos2_W35.bin
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 00:01:02:03:04:05
operating at 100M full duplex mode
Using dm9000 device
TFTP from server 192.168.1.229; our IP address is 192.168.1.230
Filename '2440ucos2_W35.bin'.
Load address: 0x30008000
Loading: T ################################
done
Bytes transferred = 462564 (70ee4 hex)

2.用go命令运行

[u-boot@MINI2440]# go 30008000
## Starting application at 0x30008000 ...
hello,FriendlyARM

（屏幕无任何变化）

说明运行失败，此实验暂告一段落……