如何将.text段从Flash加载到DSP28335片外扩展RAM中运行

我开发基于DSP28335+DSP/BIOS的程序，程序成功编译和链接后，将.out文件烧写到28335后，程序能正常运行。为了缩短程序运行时间，考虑到DSP28335的片内内存较小，我想把程序的.text段和.econst段从Flash加载到片外扩展RAM中运行，我参考了DSP28xxx_SectionCopy_nonBIOS.asm(SPRAAU8)和InitExtMemIf.asm( (David M. Alter)做了以下工作：
开始，在F28335_BIOS_flash.cmd定义了.text段和.econst段，
/*name PAGE 0:
ExtRAM origin:00100000 length:00080000
L67RAM origin:0000e000 length:00002000*/

.text : LOAD = FLASH_ABCDEFGH, PAGE = 0 /* Should be Flash */
RUN = ExtRAM, PAGE = 0 /* Must be CSM secured RAM */
LOAD_START(_text_loadstart),
LOAD_SIZE(_text_loadsize),
RUN_START(_text_runstart)

.econst : LOAD = FLASH_ABCDEFGH, PAGE = 0 /* Should be Flash */
RUN = ExtRAM, PAGE = 0 /* Must be CSM secured RAM */
LOAD_START(_econst_loadstart),
LOAD_SIZE(_econst_loadsize),
RUN_START(_econst_runstart)

然后，参考InitExtMemIf.asm(David M. Alter)，初始化了片外扩展RAM
接着，在_c_int00之前，参考DSP28xxx_SectionCopy_nonBIOS.asm，将.text和.econst从Flash加载到片外扩展RAM中
MOVL XAR5,#_text_size ; Store Section Size in XAR5
SUBB XAR5,#1
MOVL ACC,@XAR5 ; Move Section Size to ACC
MOVL XAR6,#_text_loadstart ; Store Load Starting Address in XAR6
MOVL XAR7,#_text_runstart ; Store Run Address in XAR7
LCR copy

MOVL XAR5,#_econst_size ; Store Section Size in XAR5
SUBB XAR5,#1
MOVL ACC,@XAR5 ; Move Section Size to ACC
MOVL XAR6,#_econst_loadstart ; Store Load Starting Address in XAR6
MOVL XAR7,#_econst_runstart ; Store Run Address in XAR7
LCR copy

程序在CCS3.3中能够正常编译和链接，
In .map file, .text section is defined:

section page origin length input sections
-------- ---- ---------- ---------- ----------------
.text 0 00300f0b 00000d66 RUN ADDR = 00100000
烧写到DSP28335中，程序不能正常加载运行

我把.text改成从DSP片内的L67SARAM加载后，.econst仍从片外扩展RAM中加载，程序编译链接后能够正常加载运行。
.text : LOAD = FLASH_ABCDEFGH, PAGE = 0 /* Should be Flash */
RUN = L67SARAM, PAGE = 0 /* Must be CSM secured RAM */
LOAD_START(_text_loadstart),
LOAD_SIZE(_text_loadsize),
RUN_START(_text_runstart)
.econst : LOAD = FLASH_ABCDEFGH, PAGE = 0 /* Should be Flash */
RUN = ExtRAM, PAGE = 0 /* Must be CSM secured RAM */
LOAD_START(_econst_loadstart),
LOAD_SIZE(_econst_loadsize),
RUN_START(_econst_runstart)

但我的程序只编写了部分，如果完成整个程序，DSP28335片内RAM不能满足所有程序.text的加载，怎样解决将.text段从Flash加载到DSP28335片外扩展RAM中运行？