扩展内存在.icf文件定义如下:
define symbol _EXT_SRAM_start1__ = 0xA0000000;
define symbol _EXT_SRAM_end1__ = 0xA0ffffff;
define region EXT_RAM_region1 = mem:[from _EXT_SRAM_start1__ to _EXT_SRAM_end1__];
do not initialize { section EXT_SRAM};
place in EXT_RAM_region1 {readwrite section EXT_SRAM};