请教大神，关于u-boot-2009.08移植到TQ2440时出现的问题

carsion0833

我在移植u-boot-2009.08时，到了支持从nand flash启动步骤结束，编译出现了以下的问题。
UNDEF_SYM=`arm-linux-objdump -x board/samsung/smdk2440/libsmdk2440.a lib_generic/libgeneric.a lib_generic/lzma/liblzma.a lib_generic/lzo/liblzo.a cpu/arm920t/libarm920t.a cpu/arm920t/s3c24x0/libs3c24x0.a lib_arm/libarm.a fs/cramfs/libcramfs.a fs/fat/libfat.a fs/fdos/libfdos.a fs/jffs2/libjffs2.a fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a fs/yaffs2/libyaffs2.a fs/ubifs/libubifs.a net/libnet.a disk/libdisk.a drivers/bios_emulator/libatibiosemu.a drivers/block/libblock.a drivers/dma/libdma.a drivers/fpga/libfpga.a drivers/gpio/libgpio.a drivers/hwmon/libhwmon.a drivers/i2c/libi2c.a drivers/input/libinput.a drivers/misc/libmisc.a drivers/mmc/libmmc.a drivers/mtd/libmtd.a drivers/mtd/nand/libnand.a drivers/mtd/onenand/libonenand.a drivers/mtd/ubi/libubi.a drivers/mtd/spi/libspi_flash.a drivers/net/libnet.a drivers/net/phy/libphy.a drivers/net/sk98lin/libsk98lin.a drivers/pci/libpci.a drivers/pcmcia/libpcmcia.a drivers/power/libpower.a drivers/spi/libspi.a drivers/rtc/librtc.a drivers/serial/libserial.a drivers/twserial/libtws.a drivers/usb/gadget/libusb_gadget.a drivers/usb/host/libusb_host.a drivers/usb/musb/libusb_musb.a drivers/video/libvideo.a drivers/watchdog/libwatchdog.a common/libcommon.a libfdt/libfdt.a api/libapi.a post/libpost.a | sed  -n -e 's/.*\(__u_boot_cmd_.*\)/-u\1/p'|sort|uniq`; cd /home/carsion/u-boot-2009.08 && arm-linux-ld -Bstatic -T u-boot.lds  -Ttext 0x33F80000 $UNDEF_SYM cpu/arm920t/start.o --start-group lib_generic/libgeneric.a lib_generic/lzma/liblzma.a lib_generic/lzo/liblzo.a cpu/arm920t/libarm920t.a cpu/arm920t/s3c24x0/libs3c24x0.a lib_arm/libarm.a fs/cramfs/libcramfs.a fs/fat/libfat.a fs/fdos/libfdos.a fs/jffs2/libjffs2.a fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a fs/yaffs2/libyaffs2.a fs/ubifs/libubifs.a net/libnet.a disk/libdisk.a drivers/bios_emulator/libatibiosemu.a drivers/block/libblock.a drivers/dma/libdma.a drivers/fpga/libfpga.a drivers/gpio/libgpio.a drivers/hwmon/libhwmon.a drivers/i2c/libi2c.a drivers/input/libinput.a drivers/misc/libmisc.a drivers/mmc/libmmc.a drivers/mtd/libmtd.a drivers/mtd/nand/libnand.a drivers/mtd/onenand/libonenand.a drivers/mtd/ubi/libubi.a drivers/mtd/spi/libspi_flash.a drivers/net/libnet.a drivers/net/phy/libphy.a drivers/net/sk98lin/libsk98lin.a drivers/pci/libpci.a drivers/pcmcia/libpcmcia.a drivers/power/libpower.a drivers/spi/libspi.a drivers/rtc/librtc.a drivers/serial/libserial.a drivers/twserial/libtws.a drivers/usb/gadget/libusb_gadget.a drivers/usb/host/libusb_host.a drivers/usb/musb/libusb_musb.a drivers/video/libvideo.a drivers/watchdog/libwatchdog.a common/libcommon.a libfdt/libfdt.a api/libapi.a post/libpost.a board/samsung/smdk2440/libsmdk2440.a --end-group /home/carsion/u-boot-2009.08/lib_arm/eabi_compat.o -L /opt/EmbedSky/4.3.3/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.3/armv4t -lgcc -Map u-boot.map -o u-boot
cpu/arm920t/start.o: In function `fiq':
/home/carsion/u-boot-2009.08/cpu/arm920t/start.S:532: undefined reference to `clkdivn'
make: *** [u-boot] 错误 1

这个所谓的start.S的未定义clkdivn我有点不明白，下面是start.S的部分代码：
#ifdef CONFIG_USE_IRQ

        .align  5
irq:
        get_irq_stack
        irq_save_user_regs
        bl      do_irq
        irq_restore_user_regs

        .align  5
fiq:
        get_fiq_stack
        /* someone ought to write a more effiction fiq_save_user_regs */
        irq_save_user_regs
        bl      do_fiq
        irq_restore_user_regs
#else

        .align  5
irq:
        get_bad_stack
        bad_save_user_regs
        bl      do_irq

        .align  5
fiq:
        get_bad_stack
        bad_save_user_regs
        bl      do_fiq

#endif
错误指向了最后的那个fiq：里面的bl do_fiq  
问题是，我并没有修改过任何关于fiq的内容。
然后我打开cpu/arm920t/interrupt.c
发现里面有一个do_irq (struct pt_regs *pt_regs),估计这个是上面的irq：中bl do_irq的那个do_irq吧。但是cpu/arm920t/interrupt.c里面没有其他函数了，这个问题是不是因为cpu/arm920t/interrupt.c缺少了do_fiq()函数？如果是，那要怎么改好？我对irq和fiq不是很熟悉。
有没有大神知道出错的原因和怎样修改？在此先谢谢了！