I'v got a problem ,at the last step to try out uClinux on DE2,who can help me?

[Altera_Forum]

:confused:In Ubuntu I have work out a download file renamed "down",base on system_0.ptf of DE2_NET,guided by some article on the Internet.i copied it back to windows . 

take Nios II Command shell  type commands below  1) cd /cpydrive/d/uclinux_down/  2) nios2-configure-sof DE2_NET.sof 3) nios2-download -g down all succeed  but affter commend "nios2-terminal" it come out many lines the last 2 lines is No filesystem could mount root ,tried; Kernel panic - not syncing:VFS: Unable to mount root fs on unknown-block(0.0)  then have no response.

[Altera_Forum]

Which file did you rename to down? 

The Linux build generates a few different images, including one with the kernel but no file system, so if you boot that it gives you an error similar to that.

[Altera_Forum]

At the step of make ,there are some error follow 

 ftpd.elf2flt(.text+0x6150): In function `logwtmp_keep_open': /home/niosii/uClinux-dist/user/ftpd/logwtmp.c:115: undefined reference to `bzero' ... boa.elf2flt(.text+0xd64): In function `auth_authorize': /home/niosii/uClinux-dist/user/boa/src/auth.c:358: undefined reference to `bzero' boa.elf2flt(.text+0x2584): In function `embedparse': /home/niosii/uClinux-dist/user/boa/src/config.c:325: undefined reference to `bzero' ... ftp.elf2flt(.text+0x18ec): In function `remglob': /home/niosii/uClinux-dist/user/ftp/ftp/cmds.c:949: undefined reference to `index' ftp.elf2flt(.text+0x3fa4): In function `setnmap': /home/niosii/uClinux-dist/user/ftp/ftp/cmds.c:2011: undefined reference to `index' ftp.elf2flt(.text+0x3fd0):/home/niosii/uClinux-dist/user/ftp/ftp/cmds.c:2015: undefined reference to `index' ftp.elf2flt(.text+0x58b0): In function `gunique': /home/niosii/uClinux-dist/user/ftp/ftp/ftp.c:1556: undefined reference to `rindex' ftp.elf2flt(.text+0x7670): In function `recvrequest': /home/niosii/uClinux-dist/user/ftp/ftp/ftp.c:797: undefined reference to `rindex' ftp.elf2flt(.text+0xa6b4): In function `xruserpass': /home/niosii/uClinux-dist/user/ftp/ftp/ruserpass.c:121: undefined reference to `index' ftp.elf2flt(.text+0xa6fc):/home/niosii/uClinux-dist/user/ftp/ftp/ruserpass.c:126: undefined reference to `index' ... ftpd.elf2flt(.text+0x6150): In function `logwtmp_keep_open': /home/niosii/uClinux-dist/user/ftpd/logwtmp.c:115: undefined reference to `bzero'

[Altera_Forum]

Before I can help more I may need a couple of details: 

 What article are you following? What version of Ubuntu? What version of Quartus (web edition)? Why can't you download the image from Ubuntu (why copy back to windows)? Are you using the pre-built toolchain, or did you compile it?  I assume that the 'make' you are talking about is when compiling the zImage in Ubuntu? An 'undefined reference' means that there is some kind of function call that the compiler(linker) can't find the definition for. ie it can't find the file that has the code for the function 'auth_authorize'. However, you should not be getting a zImage. The compilation should stop.  I suggest removing any image file from the 'images' folder in 'uClilnux_dist' and try compiling again. I'll watch this post for the results (and answers to my questions above...).