如题，因为软件分成BOOT和FIRMWARE两层，在FIRMWARE层不希望调用KEIL封装的初始化，所以需要手动初始化RW和ZI区。
编译器导出的变量Image$$EWRAM$$ZI$$Base和Image$$EWRAM$$ZI$$Length这两个（只需要extern声明一下）可以用来手动清零ZI区，但是没有找到RW区的相应的变量，像Image$$ER$$RW$$Base ,Load$$ER$$RW$$Base和Load$$ER$$RW$$Length这三个变量都显示“Undefined symbol”之类的错误。
忘了说，我的是KEIL FOR ARM 4.60版本。
KEIL的HELP文档里面有这么可能和这个问题有关，但是，其中的region_name如果不是EWRAM，那么是什么？
Load$$region_name$$Base Load address of the region.
Load$$region_name$$Length Region length in bytes.
Load$$region_name$$Limit Address of the byte beyond the end of the execution region.
Load$$region_name$$RO$$Base Address of the RO output section in this execution region.
Load$$region_name$$RO$$Length Length of the RO output section in bytes.
Load$$region_name$$RO$$Limit Address of the byte beyond the end of the RO output section in the execution region.
Load$$region_name$$RW$$Base Address of the RW output section in this execution region.
Load$$region_name$$RW$$Length Length of the RW output section in bytes.
Load$$region_name$$RW$$Limit Address of the byte beyond the end of the RW output section in the execution region.
Load$$region_name$$ZI$$Base Load address of the ZI output section in this execution region.
Load$$region_name$$ZI$$Length Load length of the ZI output section in bytes.
The Load Length of ZI is zero unless region_name has the ZEROPAD scatter-loading keyword set. If ZEROPAD is set then:
Load Length = Image$$region_name$$ZI$$Length
Load$$region_name$$ZI$$Limit Load address of the byte beyond the end of the ZI output section in the execution region.
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