对于smdk2410,RAM范围从0x30000000~0x34000000. u-boot占用高端内存区。从高地址到低地址内存分配如下：

　显示缓冲区                (.bss_end~34000000)

     u-boot(bss,data,text)  (33f00000~.bss_end)

     heap(for malloc)

     gd(global data)

     bd(board data)

     stack                        

     ....

     nor flash                      (0~2M)

参考：http://deshunfan.blog.163.com/blog/static/34244101200972832324749/#comment=fks_083066081081088066083081094095087082083071080087086066