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Thread: Knoppix 6.2 Boot from PXE

  1. #1

    Knoppix 6.2 Boot from PXE

    Hello list,

    Ive a query regarding PXE booting Knoppix 6.2 DVD. As per the forums and documentation, I could create initrd and vmlinuz by running terminal server. I can even boot from that vmlinuz and initrd image ( miniroot.gz ).

    But I do see that PXE boot fails to the debug shell with a message saying Probing Network devices handled by bnx2.ko. its loading bnx2.ko because my on-boards LOMs are Broadcom 5709 based.

    By going through the init script inside miniroot.gz, I could see that its trying to load bnx2.ko module from modules/net directory inside miniroot.gz and it fails. I edited the below part of script and recreated the miniroot.gz to know what exactly happens while loading bnx2.ko..

    # Load nfs modules
    NFSMODULES="$(cd /modules/net; echo af_packet.*o sunrpc.*o lockd.*o nfs_acl.*o nfs.*o)"
    for i in $NFSMODULES; do
    insmod /modules/net/"$i"
    done

    FOUND_NETWORK=""
    message "Loading network device module(s)"
    for i in $(cd /modules/net; echo *.*o); do
    case "$NFSMODULES" in
    *$i*) continue ;;
    *)
    case "$i" in
    00*) ;;
    *) message -n "${CRE} ${BLUE}Probing network device(s) handled by ${MAGENTA}$i${BLUE}.${NORMAL}"
    FOUND_NETWORK="$i" ;;
    esac
    insmod /modules/net/"$i" >/dev/null 2>&1 ;; # Edited by KP, removed redirecting to /dev/null
    esac
    done

    Now I can see that while loading bnx2.ko, its not able to load bnx2 firmware file. Here is the exact error message.

    Bnx2: cant load firmware file bnx2/bnx2-mips-06-4.6.16.fw
    Bnx2: probe of 0000:05:00.0 failed with error -2
    Bnx2: cant load firmware file bnx2/bnx2-mips-06-4.6.16.fw
    Bnx2: probe of 0000:05:00.0 failed with error -2


    But e1000 driver is getting loaded successfully on another system which has Intel NIC and PXE boot is fine by mounting my NFS share where Knoppix is residing.

    Have any one experienced on why bnx2 is failing for Knoppix 6.2 when its booted from PXE? Note that this is booting up fine from CDROM. Am I missing something here?

    Thanks in advance !


    Thanks,
    Krishnaprasad

  2. #2
    Senior Member registered user
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    461
    Perhaps it is sufficient to add the file /lib/firmware/bnx2/bnx2-mips-06-4.6.16.fw to your miniroot.gz. Since you added the driver for the network card you know how to create a new miniroot.gz.

  3. #3

    Question

    I had added the firmware files to the initrd. but it doesn't help. i've the files available under lib/firmware/bnx2 and under KNOPPIX and UNIONFS as well.

    From the error message it looks like it's not able to load the firmware files??

    Thanks much for your help !

    - Krishnaprasad

  4. #4
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    Quote Originally Posted by krishnaprasadk View Post
    I had added the firmware files to the initrd. but it doesn't help. i've the files available under lib/firmware/bnx2 and under KNOPPIX and UNIONFS as well.

    From the error message it looks like it's not able to load the firmware files??

    Thanks much for your help !

    - Krishnaprasad
    I think you may need a different firmware file; -mips- part of the name suggests to me that this isn't a Knoppix-compatible driver.

    Hope that helps!
    Krishna

  5. #5
    Senior Member registered user
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    Quote Originally Posted by krishnaprasadk View Post
    Have any one experienced on why bnx2 is failing for Knoppix 6.2 when it’s booted from PXE? Note that this is booting up fine from CDROM. Am I missing something here?
    You might want to check if you boot up from CDROM, the loading of bnx2 is done after '/sbin/init' or before '/sbin/init'.
    I think you might want to read this :-

    http://lwn.net/Articles/242046/

    It seems 'early' firmware loading will require additional tweaking.

    Cheers.

  6. #6
    Quote Originally Posted by krishna.murphy View Post
    I think you may need a different firmware file; -mips- part of the name suggests to me that this isn't a Knoppix-compatible driver.

    Hope that helps!
    Krishna
    Hi Krishna,

    I don't think so because when i boot Knoppix from a CDROM, then the same module gets loaded successfully. and i do see that only this firmware file is available in the entire CD w.r.t bnx2. So that means this firmware file must be loaded while bnx2 bootup. But unfortunately we could not check if the firmware is really loaded to the kernel or not. lsmod doesnt give this info and neither dmesg.

    Also the error message says can't load the firmware file bnx2/bnx2-mips-06-4.6.16.fw

    Probably this means while module load ( bnx2.ko ), it's not able to see the firmware file available in initrd or it's not able to load this to kernel because of some other reasons.

    Another doubt that i have is, in the case of CDROM bootup, init may be loading this firmware file after mounting the KNOPPIX image to a temporary location. i.e. it may not be getting loaded from initrd.

    if that's the case, this can't be implemented in my case because my KNOPPIX image sits in an NFS share and i need network access to mount that NFS share to a temp location...

    Thank you all for supporting me in this issue. Any ideas will be highly appreciated.

    Thanks,
    Krishnaprasad

  7. #7
    Quote Originally Posted by kl522 View Post
    You might want to check if you boot up from CDROM, the loading of bnx2 is done after '/sbin/init' or before '/sbin/init'.
    I think you might want to read this :-

    http://lwn.net/Articles/242046/

    It seems 'early' firmware loading will require additional tweaking.

    Cheers.
    Hello,

    as you know the modules ( network ) are getting loaded from initrd and the firmware load happens when bnx2.ko is getting loaded. The module gets loaded to the kernel but the network devices will be failed as the firmware is not loaded.

    From the init code, it's seen that it tries to load bnx2.ko but there the failure happens.

    # Load nfs modules
    NFSMODULES="$(cd /modules/net; echo af_packet.*o sunrpc.*o lockd.*o nfs_acl.*o nfs.*o)"
    for i in $NFSMODULES; do
    insmod /modules/net/"$i"
    done

    FOUND_NETWORK=""
    message "Loading network device module(s)"
    for i in $(cd /modules/net; echo *.*o); do
    case "$NFSMODULES" in
    *$i*) continue ;;
    *)
    case "$i" in
    00*) ;;
    *) message -n "${CRE} ${BLUE}Probing network device(s) handled by ${MAGENTA}$i${BLUE}.${NORMAL}"
    FOUND_NETWORK="$i" ;;
    esac
    insmod /modules/net/"$i" >/dev/null 2>&1 ;;
    esac
    done

    # Enable kernel messages again
    echo "6" > /proc/sys/kernel/printk
    ifconfig lo 127.0.0.1 up

    [ -n "FOUND_NETWORK" ] || debugshell


    But if i have an Intel card and if e1000.ko is the driver, this gets initalized properly. The issue is only with bnx2.ko and the firmware files.

    Unfortunately all of my systems have Onboard Broadcom NICs.

    Thanks,
    Krishnaprasad

  8. #8
    Senior Member registered user
    Join Date
    Dec 2009
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    423
    Quote Originally Posted by krishnaprasadk View Post
    Hello,

    But if i have an Intel card and if e1000.ko is the driver, this gets initalized properly. The issue is only with bnx2.ko and the firmware files.

    Unfortunately all of my systems have Onboard Broadcom NICs.
    I have asked you to read the document, you have probably not read it thoroughly yet.
    Nevermind, that's the long version of the answer. The short version of the answer is as follows :-

    You need to have a shell script called /sbin/hotplug, with execution permission, the content
    is something like this :-
    #!/bin/sh
    echo 1 > /sys/$DEVPATH/loading
    cat /lib/firmware/bnx2/$FIRMWARE > /sys/$DEVPATH/data
    echo 0 > /sys/$DEVPATH/loading

    That's will likely do the trick.
    Cheers.

  9. #9
    Quote Originally Posted by kl522 View Post
    I have asked you to read the document, you have probably not read it thoroughly yet.
    Nevermind, that's the long version of the answer. The short version of the answer is as follows :-

    You need to have a shell script called /sbin/hotplug, with execution permission, the content
    is something like this :-
    #!/bin/sh
    echo 1 > /sys/$DEVPATH/loading
    cat /lib/firmware/bnx2/$FIRMWARE > /sys/$DEVPATH/data
    echo 0 > /sys/$DEVPATH/loading

    That's will likely do the trick.


    Cheers.

    my bad !!.. i read the doc but it didn't clicked for me. I will try this out today. I've just one basic question..what's the DEVPATH needs to be used in my case? will it be the hard drive device name? please advise

    Thanks,
    Krishnaprasad

  10. #10
    Quote Originally Posted by kl522 View Post
    I have asked you to read the document, you have probably not read it thoroughly yet.
    Nevermind, that's the long version of the answer. The short version of the answer is as follows :-

    You need to have a shell script called /sbin/hotplug, with execution permission, the content
    is something like this :-
    #!/bin/sh
    echo 1 > /sys/$DEVPATH/loading
    cat /lib/firmware/bnx2/$FIRMWARE > /sys/$DEVPATH/data
    echo 0 > /sys/$DEVPATH/loading

    That's will likely do the trick.
    Cheers.
    Hi, Please ignore my previous post.

    i do see that DEVPATH is the Path under /sys at which this device's sysfs directory can be found. i saw the documentation inside Documentation/firmware_class as well. From there i understood the way kernel is calling the firmware and how it needs to be passed from the user end. per your advise, I've created a script /sbin/hotplug as below:-

    #!/bin/sh
    echo 1 > /sys/$DEVPATH/loading
    cat /lib/firmware/bnx2/$FIRMWARE > /sys/class/firmware/data
    echo 0 > /sys/$DEVPATH/loading


    Now the firmware is read while loading the module and it fails with an error message as below

    firmware 0000:05:00.0: firmware_loading_store: vmap() failed
    bnx2: Can't load firmware file "bnx2/bnx2-mips-06-4.6.16.fw"
    bnx2: probe of 0000:05:00.0 failed with error -2

    I am checking bnx2 driver code on why this failure is seen.

    Thanks,
    Krishnaprasad

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