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Altera_Forum's avatar
Altera_Forum
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15 years ago

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

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)

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    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's avatar
    Altera_Forum
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    15 years ago

    --- 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's avatar
    Altera_Forum
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    15 years ago

    Please rename jtag_uart_0 to jtag_uart in your sopc builder.

    - Hippo