# [OmniOS-discuss] Quick Test of r151021 ISO Install using Xen HVM and an "xdf" Device

Prakash Surya prakash.surya at delphix.com
Wed Mar 8 18:49:56 UTC 2017

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    Thanks Dan, this is exactly the process I took. I used the KMDB "trick" to
    modify "apix_enable" and get the ISO installer to boot, and the updated
    "/mnt/etc/system" after the installation completed (as Dan mentioned).

    On Wed, Mar 8, 2017 at 7:08 AM, Dan McDonald <danmcd at omniti.com> wrote:

    >
    > On Mar 8, 2017, at 2:28 AM, Stephan Budach <stephan.budach at jvm.de> wrote:
    >
    > Can you elaborate on that a little more as of what exactly you did to the
    > loader? I am guessing that you modified the kernel boot arguments,
    > but unfortuanetly, I am unfamiliar with the new loader.
    >
    >
    > Screenshots being inlined...
    >
    > Step 1:  Say hello to the new Loader menu:
    >
    >
    > note that on the new ISO, there will be no "Select Boot Environment"
    > option.  Nonetheless, we don't want that.  We want to modify the boot
    > options (#5 or the 'O' key):
    >
    > Step 2:  Say hello to the Boot Options menu:
    >
    >
    > To boot under kmdb  (the kernel debugger) AND have the kmdb prompt occur
    > immediately you now simply enable kmdb with 'm' or with '7', and debug with
    > 'd' or '8'.  After pressing both keys, things should look like this:
    >
    >
    > Step 3:  Press RETURN to boot, and get to the kmdb prompt and fix
    > apix_enable.
    >
    > You will get to the kmdb prompt now.  I've typed in three commands:
    >  "apix_enable/X" to show its current value, "apix_enable/W0" to set it to
    > 0, and "apix_enable/X" again to show it is indeed 0.  Pardon the noise on
    > one part... using arrows for history on kmdb prints extra characters:
    >
    >
    > Step 4:  Proceed with boot.
    >
    > Enter ":c" into kmdb and the kernel will boot.
    >
    >
    > If you do that trick on the installer ISO, you'll jump immediately to the
    > installation menu.
    >
    > Once booted, if it's an installed system, you can login and edit
    > /etc/system to add: "set apix_enable=0" on a line by itself.  If it's the
    > installer ISO, do the installation, THEN enter the shell and edit
    > /mnt/etc/system.  The new installer keeps the newly-installed BE mounted on
    > /mnt so people can post-process it after installation.  We MAY exploit this
    > to enhance the installation menu and installation experience.
    >
    > Hope this helps!
    > Dan
    >
    >
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