MINI板STM32f103rbt6的内存管理实验出现如下问题：

a1154870074

MINI板STM32f103rbt6没有扩展内存，经查STM32f103rbt6的内置内存为20KByte。因此在malloc.h中设置


#define MEM_BLOCK_SIZE                        32                                                            //内存块大小32字节
#define MEM_MAX_SIZE                        20*1024                                                  //整个内存大小20K字节
#define MEM_ALLOC_TABLE_SIZE        MEM_MAX_SIZE/MEM_BLOCK_SIZE         //内存表大小为640



但是编译出错如下
compiling usmart_config.c...
compiling usmart_str.c...
compiling malloc.c...
linking...
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching malloc.o(.bss).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching startup_stm32f10x_md.o(STACK).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching startup_stm32f10x_md.o(HEAP).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching usmart_config.o(.data).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching usart.o(.bss).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching libspace.o(.bss).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching usmart.o(.data).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching system_stm32f10x.o(.data).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching stm32f10x_rcc.o(.data).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching malloc.o(.data).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching lcd.o(.bss).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching usart.o(.data).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching lcd.o(.data).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching delay.o(.data).
..\OBJ\MALLOC.axf: Error: L6406E: No space in execution regions with .ANY selector matching key.o(.data).
..\OBJ\MALLOC.axf: Error: L6407E: Sections of aggregate size 0x5dc8 bytes could not fit into .ANY selector(s).
Not enough information to list image symbols.
Not enough information to list the image map.
Finished: 2 information, 0 warning and 16 error messages.
"..\OBJ\MALLOC.axf" - 16 Error(s), 0 Warning(s).
Target not created.
Build Time Elapsed:  00:00:14


请问为什么？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？

a1154870074

当#define    MEM_MAX_SIZE      20*1024  出错
当#define    MEM_MAX_SIZE      19*1024  出错
当#define    MEM_MAX_SIZE      18*1024  出错
当#define    MEM_MAX_SIZE      17*1024  出错

当#define    MEM_MAX_SIZE      16*1024  编译通过