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how to modify run level in zed board

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hi,

can you give the suggestion how to modify the run level in zed board. i tried to modify the run level in /etc/inittab file id:1:initdefault instead of id:5:initdefault: .but it is not changed. so anyone have an idea regarding this issue. please suggest me and how to remove the login id and password after booting the zed board.



Thanks & Regards,
srinivas Rao

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  • 0

    Hi Srinivas,

    I guess there is some confusion in what exactly it is you are trying to accomplish.

    The console message you see is telling you that you have reached runlevel 1 and that INIT has finished launching all of the processes it was instructed to.

    Are you simply looking to boot the system in runlevel 1 or do you simply want to bypass the login prompt?

    If you are looking to boot the system in runlevel one then it sounds like you have already done so.

    If you are looking to bypass the login prompt for development purposes you will need to modify your RAM disk image.  I assume you already understand the negative security implications of bypassing the login prompt and you are not planning to release your image upon other unsuspecting users without ample warning. 

    Not sure if this is the cleanest way to do this, but it works okay for me:

    1) Create an autologin script /home/root/autologin.sh that getty can invoke at startup and add the following lines to it:

    #!/bin/sh
    exec /bin/login -f root

    2) Make the autologin script executable:

    chmod a+x autologin.sh

    3) Modify your /etc/inittab file and comment out getty line (so that you can undo all this work later when you go to production) at the very end of the file like this:

    #PS0:2345:respawn:/sbin/getty -L 115200 ttyPS0 vt100

    4) Then add the following line to the end of /etc/inittab to force the login of root automatically:

    PS0:2345:respawn:/sbin/getty -l /home/root/autologin.sh -n -L 115200 ttyPS0 vt100

    If you are using the RAM disk image from one of the Xilinx Releases like I did, then you will find these instructions useful for modifying the contents of your RAM disk image:

    http://microzed.org/content/how-modify-ramdisk-image-comes-release-145

    http://www.wiki.xilinx.com/Build+and+Modify+a+Rootfs

    If someone has a cleaner way of doing this, please educate the rest us.

    Regards,

    -Kevin

  • 0 in reply to zedhed



    Hi kevin

    Thanks for reply. I have understood your suggestions. i am looking for bypass the login prompt for development purpose. i have used petalinux 2014.2 version. i got a image.ub, zImage, system.dtb, BOOT.BIn and  rootfs.cpio for file system from petalinux. where exactly i got a problem is even i try to do changes in bootargs file system not access from sdcard or mtd3. its creating own virtual file system. i can't do any modification in that because when i reboot the board everything will be taken from default state only. i hope you can understand my intention.


    METHOD - 1

    //.................................filesystem from sdcard and kernel image from mtd2 (spi flash).........................................//

    mmcbootargs=console=ttyPS0,115200 root=/dev/mmcblk0p2 rw rootfstype=ext4
    mmcbootcmd=run mmcbootargs ; sf probe 0; sf read 0xfa0000 0x520000 0xa80000 && bootm 0xfa0000
    run mmcbootcmd


    METHOD - 2

    //............................file system from mtd3 and kernel imagge from mtd2  (spiflash )..............................................

    bootargs=console=ttyPS0,115200 root=/dev/mtd3 rw earlyprintk 5
    qspiboot_test= run bootargs ; sf probe 0; sf read 0xfa0000 0x520000 0xa80000 && bootm 0xfa0000

    run qspiboot_test

    //..............................................................................................................

Reply
  • 0 in reply to zedhed



    Hi kevin

    Thanks for reply. I have understood your suggestions. i am looking for bypass the login prompt for development purpose. i have used petalinux 2014.2 version. i got a image.ub, zImage, system.dtb, BOOT.BIn and  rootfs.cpio for file system from petalinux. where exactly i got a problem is even i try to do changes in bootargs file system not access from sdcard or mtd3. its creating own virtual file system. i can't do any modification in that because when i reboot the board everything will be taken from default state only. i hope you can understand my intention.


    METHOD - 1

    //.................................filesystem from sdcard and kernel image from mtd2 (spi flash).........................................//

    mmcbootargs=console=ttyPS0,115200 root=/dev/mmcblk0p2 rw rootfstype=ext4
    mmcbootcmd=run mmcbootargs ; sf probe 0; sf read 0xfa0000 0x520000 0xa80000 && bootm 0xfa0000
    run mmcbootcmd


    METHOD - 2

    //............................file system from mtd3 and kernel imagge from mtd2  (spiflash )..............................................

    bootargs=console=ttyPS0,115200 root=/dev/mtd3 rw earlyprintk 5
    qspiboot_test= run bootargs ; sf probe 0; sf read 0xfa0000 0x520000 0xa80000 && bootm 0xfa0000

    run qspiboot_test

    //..............................................................................................................

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