graduate_1\graduate_1.axf: Error: L6218E: Undefined symbol HAL_SDRAM_Init (referred from bsp_fmc_sdram.o).
graduate_1\graduate_1.axf: Error: L6218E: Undefined symbol HAL_SDRAM_SendCommand (referred from bsp_fmc_sdram.o).
graduate_1\graduate_1.axf: Error: L6218E: Undefined symbol HAL_SDRAM_ProgramRefreshRate (referred from bsp_fmc_sdram.o).
graduate_1\graduate_1.axf: Error: L6218E: Undefined symbol bsp_InitDWT (referred from bsp.o).
graduate_1\graduate_1.axf: Error: L6218E: Undefined symbol bsp_InitKey (referred from bsp.o).
graduate_1\graduate_1.axf: Error: L6218E: Undefined symbol bsp_InitTimer (referred from bsp.o).
graduate_1\graduate_1.axf: Error: L6218E: Undefined symbol bsp_InitUart (referred from bsp.o).
graduate_1\graduate_1.axf: Error: L6218E: Undefined symbol bsp_InitExtIO (referred from bsp.o).
graduate_1\graduate_1.axf: Error: L6218E: Undefined symbol bsp_InitLed (referred from bsp.o).
graduate_1\graduate_1.axf: Error: L6218E: Undefined symbol bsp_KeyScan10ms (referred from bsp.o).
替换后又出现这些报错应该怎么办