printf重定向到SCI，报错error #10234-D: unresolved symbols remain，求救啊

28335编译中，想使用printf函数

CMD内存大小已经更改

RAML0 : origin = 0x008000, length = 0x002000
RAML1 : origin = 0x00a000, length = 0x005000
/* RAML2 : origin = 0x00d000, length = 0x002000 */
RAML3 : origin = 0x00f000, length = 0x002000

#include <stdio.h>，#include <string.h>已添加

设置已更改

只要程序中带有printf函数，就提示如下错误，

undefined       first referenced
symbol                in file
---------            ----------------
__SYSMEM_SIZE ../lib/rts2800_fpu32.lib<memory.obj>

error #10234-D: unresolved symbols remain

error #10010: errors encountered during linking; "HJ0103-20200215.out" not built

请问怎么完整重定向？