谢谢7楼的回复

这两天我改了一下，下面是我修改好的CMD文件，编译和链接已经没有问题了，但是下载程序还是有问题。
/*
// TI File $Revision: /main/1 $
// Checkin $Date: September 16, 2005   13:06:33 $
//###########################################################################
//
// FILE:    2808_RAM_lnk.cmd
//
// TITLE:   Linker Command File For 2808 examples that run out of RAM
//
//          This ONLY includes all SARAM blocks on the 2808 device.
//          This does not include flash or OTP.
//
//          Keep in mind that L0 and L1 are protected by the code
//          security module.
//
//          What this means is in most cases you will want to move to
//          another memory map file which has more memory defined.  
//
//###########################################################################
// $TI Release: DSP280x V1.30 $
// $Release Date: February 10, 2006 $
//###########################################################################
*/

/* ======================================================
// For Code Composer Studio V2.2 and later
// ---------------------------------------
// In addition to this memory linker command file,
// add the header linker command file directly to the project.
// The header linker command file is required to link the
// peripheral structures to the proper locations within
// the memory map.
//
// The header linker files are found in <base>DSP281x_Headerscmd
//   
// For BIOS applications add:      DSP280x_Headers_BIOS.cmd
// For nonBIOS applications add:   DSP280x_Headers_nonBIOS.cmd   
========================================================= */

/* ======================================================
// For Code Composer Studio prior to V2.2
// --------------------------------------
// 1) Use one of the following -l statements to include the
// header linker command file in the project. The header linker
// file is required to link the peripheral structures to the proper
// locations within the memory map                                    */

/* Uncomment this line to include file only for non-BIOS applications */
/* -l DSP280x_Headers_nonBIOS.cmd */

/* Uncomment this line to include file only for BIOS applications */
/* -l DSP280x_Headers_BIOS.cmd */

/* 2) In your project add the path to <base>DSP280x_headerscmd to the
   library search path under project->build options, linker tab,
   library search path (-i).
/*========================================================= */

/* Define the memory block start/length for the F2808  
   PAGE 0 will be used to organize program sections
   PAGE 1 will be used to organize data sections

   Notes:
         Memory blocks on F2808 are uniform (ie same
         physical memory) in both PAGE 0 and PAGE 1.  
         That is the same memory region should not be
         defined for both PAGE 0 and PAGE 1.
         Doing so will result in corruption of program
         and/or data.
         
         L0/L1 and H0 memory blocks are mirrored - that is
         they can be accessed in high memory or low memory.
         For simplicity only one instance is used in this
         linker file.
         
         Contiguous SARAM memory blocks can be combined
         if required to create a larger memory block.
*/


MEMORY
{
PAGE 0 :
   /* For this example, H0 is split between PAGE 0 and PAGE 1 */  
   /* BEGIN is used for the "boot to SARAM" bootloader mode   */
   
   BEGIN      : origin = 0x000000, length = 0x000002            
   RAMM0      : origin = 0x000002, length = 0x0003FE
   RAML0      : origin = 0x008000, length = 0x001000   
   PRAMH0     : origin = 0x3FA000, length = 0x001000
   RESET      : origin = 0x3FFFC0, length = 0x000002
   BOOTROM    : origin = 0x3FF000, length = 0x000FC0               

         
PAGE 1 :

   /* For this example, H0 is split between PAGE 0 and PAGE 1 */

   RAMM1    : origin = 0x000400, length = 0x000400
   RAML1    : origin = 0x009000, length = 0x001000     
   DRAMH0   : origin = 0x3FB000, length = 0x001000
   /*&Iuml;&Acirc;&Atilde;&aelig;&Ecirc;&Ccedil;&Iacute;&acirc;&Eacute;è&Aring;&auml;&Ouml;&Atilde;*/
   DEV_EMU     : origin = 0x000880, length = 0x000180     /* device emulation registers */
   FLASH_REGS  : origin = 0x000A80, length = 0x000060     /* FLASH registers */
   CSM         : origin = 0x000AE0, length = 0x000010     /* code security module registers */
   
   ADC_MIRROR  : origin = 0x000B00, length = 0x000010     /* ADC Results register mirror */
   
   CPU_TIMER0  : origin = 0x000C00, length = 0x000008     /* CPU Timer0 registers */
   CPU_TIMER1  : origin = 0x000C08, length = 0x000008     /* CPU Timer0 registers (CPU Timer1 & Timer2 reserved TI use)*/
   CPU_TIMER2  : origin = 0x000C10, length = 0x000008     /* CPU Timer0 registers (CPU Timer1 & Timer2 reserved TI use)*/

   PIE_CTRL    : origin = 0x000CE0, length = 0x000020     /* PIE control registers */
   PIE_VECT    : origin = 0x000D00, length = 0x000100     /* PIE Vector Table */

   ECANA       : origin = 0x006000, length = 0x000040     /* eCAN-A control and status registers */
   ECANA_LAM   : origin = 0x006040, length = 0x000040     /* eCAN-A local acceptance masks */
   ECANA_MOTS  : origin = 0x006080, length = 0x000040     /* eCAN-A message object time stamps */
   ECANA_MOTO  : origin = 0x0060C0, length = 0x000040     /* eCAN-A object time-out registers */
   ECANA_MBOX  : origin = 0x006100, length = 0x000100     /* eCAN-A mailboxes */

   ECANB       : origin = 0x006200, length = 0x000040     /* eCAN-B control and status registers */
   ECANB_LAM   : origin = 0x006240, length = 0x000040     /* eCAN-B local acceptance masks */
   ECANB_MOTS  : origin = 0x006280, length = 0x000040     /* eCAN-B message object time stamps */
   ECANB_MOTO  : origin = 0x0062C0, length = 0x000040     /* eCAN-B object time-out registers */
   ECANB_MBOX  : origin = 0x006300, length = 0x000100     /* eCAN-B mailboxes */

EPWM1       : origin = 0x006800, length = 0x000022     /* Enhanced PWM 1 registers */
   EPWM2       : origin = 0x006840, length = 0x000022     /* Enhanced PWM 2 registers */
   EPWM3       : origin = 0x006880, length = 0x000022     /* Enhanced PWM 3 registers */
   EPWM4       : origin = 0x0068C0, length = 0x000022     /* Enhanced PWM 4 registers */
   EPWM5       : origin = 0x006900, length = 0x000022     /* Enhanced PWM 5 registers */
   EPWM6       : origin = 0x006940, length = 0x000022     /* Enhanced PWM 6 registers */

   ECAP1       : origin = 0x006A00, length = 0x000020     /* Enhanced Capture 1 registers */
   ECAP2       : origin = 0x006A20, length = 0x000020     /* Enhanced Capture 2 registers */
   ECAP3       : origin = 0x006A40, length = 0x000020     /* Enhanced Capture 3 registers */
   ECAP4       : origin = 0x006A60, length = 0x000020     /* Enhanced Capture 4 registers */         

   EQEP1       : origin = 0x006B00, length = 0x000040     /* Enhanced QEP 1 registers */
   EQEP2       : origin = 0x006B40, length = 0x000040     /* Enhanced QEP 2 registers */   

   GPIOCTRL    : origin = 0x006F80, length = 0x000040     /* GPIO control registers */
   GPIODAT     : origin = 0x006FC0, length = 0x000020     /* GPIO data registers */
   GPIOINT     : origin = 0x006FE0, length = 0x000020     /* GPIO interrupt/LPM registers */
                 
   SYSTEM      : origin = 0x007010, length = 0x000020     /* System control registers */
   SPIA        : origin = 0x007040, length = 0x000010     /* SPI-A registers */
   SCIA        : origin = 0x007050, length = 0x000010     /* SCI-A registers */
   XINTRUPT    : origin = 0x007070, length = 0x000010     /* external interrupt registers */

   ADC         : origin = 0x007100, length = 0x000020     /* ADC registers */
   SPIB        : origin = 0x007740, length = 0x000010     /* SPI-B registers */

   SCIB        : origin = 0x007750, length = 0x000010     /* SCI-B registers */
   SPIC        : origin = 0x007760, length = 0x000010     /* SPI-C registers */

   SPID        : origin = 0x007780, length = 0x000010     /* SPI-D registers */
   
   I2CA        : origin = 0x007900, length = 0x000040     /* I2C-A registers */
   
   CSM_PWL     : origin = 0x3F7FF8, length = 0x000008     /* Part of FLASHA.  CSM password locations. */         
}

或者是.ebss     .econst这两段的内容加起来超过了DRAMH0的大小。
如果是单独一段超过的话会有错误，两段的和超过大小不知道会不会提示。
你看一下map文件，各段大小和使用情况