Linux/AM3352: About SPI EEPROM Support in u-boot

Part Number:AM3352

Tool/software: Linux

Hi Sir 

We would like to support SPI EEPROM in u-boot.

And then we enable CONFIG_SPI and CONFIG_CMD_EEPROM in configuration.

But we met below error issue

cmd/built-in.o: In function `eeprom_rw_block':
cmd/eeprom.c:138: undefined reference to `spi_read'
cmd/eeprom.c:140: undefined reference to `spi_write'

We enable below setting in am335x_evm.h
#define CONFIG_CMD_EEPROM
#define CONFIG_SPI

and following file is the configuration file 

(Please visit the site to view this file)

please advise

BR
Yimin