将u-boot 2012.04.01移植到JZ2440开发板
拿到一个UBOOT，要知道怎样编译和修改可以看一看顶层目录下的README文件，其中有如下内容
Building the Software:
======================
U-Boot is intended to be simple to build. After installing the
sources you must configure U-Boot for one specific board type. This
is done by typing:
make NAME_config
where "NAME_config" is the name of one of the existing configu-
rations; see boards.cfg for supported names.
Finally, type "make all", and you should get some working U-Boot
images ready for download to / installation on your system:
If the system board that you have is not listed, then you will need
to port U-Boot to your hardware platform. To do this, follow these
steps:
1. Add a new configuration option for your bo