如何使应用程序在RAM里面跑起来。对于IAR编译器，其使很简单，只要稍做修改即可。下面这一段代码，是截取LM3S.icf配置文件的某一段，

//

// Define a memory region that covers the entire 4 GB addressible space of the

// processor.

//

define memory mem with size = 4G;                                                                        //  指定CPU的寻址范围

//

// Define a region for the on-chip flash.

//

define region FLASH = mem:[from 0x00000000 to 0x0003ffff];                    //  指定片内Flash的范围

//

// Define a region for the on-chip SRAM.

//

define region SRAM = mem:[from 0x20000000 to 0x2000ffff];                              //  指定片内SRAM的范围

//

// Define a block for the heap.  The size should be set to something other

// than zero if things in the C library that require the heap are used.

//

define block HEAP with alignment = 8, size = 0x00000000 { };                             //  定义堆空间的大小

//

// Indicate that the read/write values should be initialized by copying from

// flash.

//

initialize by copy { readwrite };                       //  指示read/write数据在初始化过程中要从Flash中拷贝出来

//

// Indicate that the noinit values should be left alone.  This includes the

// stack, which if initialized will destroy the return address from the

// initialization code, causing the processor to branch to zero and fault.

//

do not initialize { section .noinit }; //  预留一个段不拷贝到RAM，这部分通常是包含着中断//向量表的段

//

// Place the interrupt vectors at the start of flash.

//

place at start of SRAM { readonly section .intvec };                            //  将中断向量表放在SRAM的起始地址处

//

// Place the remainder of the read-only items into flash.

//

place in SRAM { readonly };                                                        //  将剩余的read-only项放入SRAM

//

// Place all read/write items into SRAM.

//

place in SRAM { readwrite, block HEAP };                                //  将所有的read/write项及堆空间放入SRAM