uclinux的编译问题

haosf

编译内核，出现错误：drivers/ serial / serial.o in function'uart_setup_port'

/root/uclinux-dist/ linux-2.4.x/drivers/ serial / serial_core.c:1857:undefined reference to 'uart_type"

/root/uclinux-dist/ linux-2.4.x/drivers/ serial / serial_core.c:1857:relocation truncated to fit: R_ARM_PC24 UATR_TYPE

drivers/ serial / serial.o in function'uart_register_port'

/root/uclinux-dist/ linux-2.4.x/drivers/ serial / serial_core.c:1857:undefined reference to "UART_type'

/root/uclinux-dist/ linux-2.4.x/drivers/ serial / serial_core.c:1857:relocation truncated to fit: R_ARM_PC24 UATR_TYPE
make[1]: ***[linux] error1

make[1]: leaving directory 'root/uclinux-dist/linux-2.4.x'

make :*** error1

不知道什么原因了  请帮忙看一下，谢谢