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Altera_Forum's avatar
Altera_Forum
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19 years ago

no boot over nfs

Hello!

My configuration worked well with initramfs. Now i like to boot over NFS. I did everything like in "NFSFileSystem" and I can mount the NFS in the linux booted with initramfs. Further I had to enabled in Networking "IP: kernel level autoconfiguration" and Network File Systems "Root file system on NFS" to get the system booting over nfs.

First I had an error like "can not open initial console" because "/dev" was empty. So I created the device nodes defined in "romfs_list".

Now I have the following error: 

IP-Config: Complete:
device=eth0, addr=192.168.1.10, mask=255.255.255.0, gw=255.255.255.255,
host=nios2, domain=, nis-domain=(none),
bootserver=192.168.1.2, rootserver=192.168.1.2, rootpath=
Looking up port of RPC 100003/2 on 192.168.1.2
Looking up port of RPC 100005/1 on 192.168.1.2
VFS: Mounted root (nfs filesystem).
Freeing unused kernel memory: 56k freed (0x176000 - 0x183000)
Kernel panic - not syncing: Attempted to kill init!

When I trac the traffic with wireshark, I can see that "rc" is executed and "inittab" (which is empty) is called. After that call the traffic stops followed by an ARP.

can anybody help me?

5 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    19 years ago

    Hi!

    If I add the line "ttyS0:vt100:/bin/sh" to the inittab I get a console and no Kernel panic anymore. But the welcome screen from rc (/etc/motd) is not shown.

    When I boot with initramfs, inittab is empty but I still get a console and the welcome screen is shown. I use the normal UART and not the JTAG UART.

    Do i have to set the std_out somewhere?

    Or has anybody an other idea?

    thanks for your help!

    glattchr
  • Altera_Forum's avatar
    Altera_Forum
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    19 years ago

    which console device do you use ? jtag or rs232?

    In kernel menuconfig, you should select either jtag uart or serial uart for console device (but not both).

    Device Drivers ---> Character devices ---> Serial drivers --->

    if you use jtag uart (with a USB Blaster cable) on a nios2-terminal,

    [ ] Nios serial support

    [*] Altera JTAG UART support

    [*] Support for console on Altera JTAG UART

    if you use serial uart (with a 9-pin RS-232C cable) on a terminal emulator such as minicom or ckermit,

    [*] Nios serial support

    [*] Support for console on Nios UART

    [ ] Altera JTAG UART support

    The console device will use /dev/console node.

    Yes, you need to create all /dev nodes or copy them from initamfs.

    Do you get the shell prompt?
  • Altera_Forum's avatar
    Altera_Forum
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    19 years ago

    Hello Hippo

    Thanks for your help!

    I disabled the sysfs support as you told me. I had both UARTs enabled in the Nios, but only the "normal" (not JTAG) in the kernel. After recomiling the Nios with only one UART, I got the "welcome screen" also when booting over NFS. But with the empty inittab, I've got still a kernel panic, with the "ttyS0:vt100:/bin/sh" line, it works.

    Do you know if the initramfs does some further initialisation which I don't get when boot over NFS?

    best regards

    glattchr
  • Altera_Forum's avatar
    Altera_Forum
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    19 years ago

    Yes, you should not enable both jtag and uart as "support for console" in kernel config.

    You should choose only one of them. see the wiki,

    http://nioswiki.jot.com/wikihome/operating...nux/linuxconfig (http://nioswiki.jot.com/wikihome/operatingsystems/%c2%b5clinux/linuxconfig)

    <div class='quotetop'>QUOTE </div>

    --- Quote Start ---

    if you use serial uart (with a 9-pin RS-232C cable) on a terminal emulator such as minicom or ckermit,

    [*] Nios serial support

    [*] Support for console on Nios UART

    [ ] Altera JTAG UART support[/b]

    --- Quote End ---

    Do you have /dev/console ? I uploaded a rootfs which I used for the test.

    http://nioswiki.jot.com/wikihome/operating...s-nios2.tar.bz2 (http://nioswiki.jot.com/wikihome/operatingsystems/%c2%b5clinux/nfsfilesytem/rootfs-nios2.tar.bz2)

    In user config,

    Core Applications --->

    [*] init

    [*] enable console shell

    Then the init will open /dev/console for a shell.

    If you do not select "enable console shell " or you do not have /dev/console, then you have to add a terminal to inittab.