how to create a linux system on a nios2-mmu for a custom fpga board?

[Altera_Forum]

Hi, 

  I have a custom FPGA dev board, based on ep3c25, with a 16MBytes SDRAM.    I want to build a linux system with mmu support, I have followed the very how to article: http://nioswiki.com/linux, but always failed.(a custom_fpga.h created) The result is:nios2-download -g images/zimage.initramfs.gz; nios2-terminal using cable "usb-blaster [usb 5-1.1]", device 1, instance 0x00 pausing target processor: ok initializing cpu cache (if present) ok downloaded 1643kb in 14.5s (113.3kb/s) verified ok  starting processor at address 0xc1500000 nios2-terminal: connected to hardware target using jtag uart on cable nios2-terminal: "usb-blaster [usb 5-1.1]", device 1, instance 0 nios2-terminal: (use the ide stop button or ctrl-c to terminate)  uncompressing linux...  error bad gzip magic numbers   -- system halted  Some file(screenshot) attached, please help me. Thank you!!!   (http://www.alteraforum.com/forum/attachment.php?attachmentid=2581&stc=1&d=1275320625)

[Altera_Forum]

What is your pc linux distro? 

 Please set "boot link offset" to 0xa00000 in kernel config. It is about 2/3 of 16MB.  Or, please run nios2-download -g images/linux.initramfs.gz  Or, please try u-boot first to verify your system.  http://nioswiki.com/dasuboot  - Hippo

[Altera_Forum]

--- Quote Start ---  What is your pc linux distro?  Please set "boot link offset" to 0xa00000 in kernel config. It is about 2/3 of 16MB.  Or, please run nios2-download -g images/linux.initramfs.gz  Or, please try u-boot first to verify your system.  http://nioswiki.com/dasuboot  - Hippo  --- Quote End ---    Hi, Hippo   Thank you!  My linux distro is Debian(testing).  I have corrected the boot link to 0xa00000 which point to the kernel space. But after compiling:  nios2-download -g images/zimage.initramfs.gz; nios2-terminal Using cable "USB-Blaster [USB 6-1.1]", device 1, instance 0x00 Processor is already paused Initializing CPU cache (if present) OK Downloaded 1642KB in 14.3s (114.8KB/s) Verified OK  Starting processor at address 0xC1A00000 nios2-terminal: connected to hardware target using JTAG UART on cable nios2-terminal: "USB-Blaster [USB 6-1.1]", device 1, instance 0 nios2-terminal: (Use the IDE stop button or Ctrl-C to terminate)  Uncompressing Linux...   no more character then...  And If I run: nios2-download -g images/linux.initramfs.gz; nios2-terminal Using cable "USB-Blaster [USB 6-1.1]", device 1, instance 0x00 Processor is already paused Initializing CPU cache (if present) OK Downloaded 2638KB in 23.0s (114.6KB/s) Verified OK  Starting processor at address 0xC1000000 nios2-terminal: connected to hardware target using JTAG UART on cable nios2-terminal: "USB-Blaster [USB 6-1.1]", device 1, instance 0 nios2-terminal: (Use the IDE stop button or Ctrl-C to terminate)  Early printk initialized  No more character then....   Which options should I check next?  Thank you !! 

[Altera_Forum]

Please rename jtag_uart_0 to jtag_uart in your sopc builder. 

 - Hippo