uClinux unable to mount

Hello:

hippo,I was trying to bulid uClinux in Altera DE2,and my linux envirment is Ubuntu.I follow the http://www.cnblogs.com/maqingbiao/archive/2010/07/23/1784069.html step by step.when I make,there is the problem.

make[1]: 正在进入目录 `/usr/local/src/uClinux-dist/linux-2.6.x'

CHK include/nios2_system.h

perl -I/usr/local/src/uClinux-dist/linux-2.6.x/arch/nios2nommu/scripts /usr/local/src/uClinux-dist/linux-2.6.x/arch/nios2nommu/scripts/gen_nios2_system.h.pl cpu_0 sdram_0 cfi_flash_0 < /usr/local/src/system_0.ptf > include/nios2_system.h.tmp; if [ -r include/nios2_system.h ] && cmp -s include/nios2_system.h include/nios2_system.h.tmp; then rm -f include/nios2_system.h.tmp; else echo ' UPD include/nios2_system.h'; mv -f include/nios2_system.h.tmp include/nios2_system.h; fi

CHK include/linux/version.h

CHK include/linux/utsrelease.h

CHK include/linux/compile.h

/usr/local/src/uClinux-dist/linux-2.6.x/scripts/gen_initramfs_list.sh: Cannot open '../romfs ../vendors/Altera/nios2nommu/romfs_list'

make[2]: *** [usr/initramfs_data.cpio.gz] &#38169;&#35823; 1

make[1]: *** [usr] &#38169;&#35823; 2

make[1]:&#27491;&#22312;&#31163;&#24320;&#30446;&#24405; `/usr/local/src/uClinux-dist/linux-2.6.x'

make: *** [linux] &#38169;&#35823; 1

Before that,I make successfull,but when I nios2-download and nios2-terminal,it says "No filesystem could mount root",so,and redownload the uClinux-dist-20070130.tar.bz2,and make it again,the above problem came,I found a lot of wet page,and I think I can resolve it by myself,but now,I can't,so please tell me how to do.I think the problem is the mistake happen at romfs,but I don't know how to resolve it?