Awesome, so now its all copyed over to the HD, we need to configure some of the network settings, so that eveytime it boots, it will be on your network

This first screen that comes up askes for an ip address for the box, something simple to remember (as you may need to configure it more.

Enter the ip that you would like for the xbox to have. i chose 192.168.1.107 and hit enter.

Hit enter and keep the netmask as default (unless you have another netmask)

and enter your gateway, once again, i entered 192.168.1.1 for my setup.

hit enter

 Now we need to name the front end, this is the hostname for the box, as you can see in the image above - I entered xboxfrontend as my hostname

Hit Enter

It now asks you for a domain, since i dont run an internal domain in my house, i just hit enter!

Awesome, so we are almost done. hit any key to continue and you should be back to your prompt screen.

type in "reboot" and hit enter

your xbox will now shut down and reboot. when you see the xbox logo, hit eject and remove your dvd (or cdrw) from the drive and you should be at your default dashboard.

we now need to edit some settings on your xbox, and move some files around.  for this to boot properly.

firstly, ftp to your xbox (the ip should show on your dashboard (i use evox). and the normal ftp login and password apply (xbox/xbox). i use FlashFXP for all my ftp needs, (http://www.flashfxp.com/).

Open flashfxp, and click on the right lightning bolt.

a popup window will show, type in your xbox's ip address in the ip field, and the username is: xbox and the password is: xbox

click connect and it should log on to your xbox, the directory structure resembles the following picture. we will be dealing with the C, E, and F drives.

first thing we need to do is navigate to a directory on your own computer to temporarly store some files, on the left side of the Fash FXP window, it should be listing some of your own directory's. By default mine opens up to the desktop. so i double click on my computer, and then my c drive. Once on my C drive I right clicked  in the white area, and selected  Make Folder. I named this folder xboxmyth. Once this folder has been created, double click it to enter it.

Now we need to navigate to where Debian (linux) has been installed on your box.

double click the e drive on the right side of flash fxp, and double click debian.

Now we need to backup some of the files from the linux install over to your computer, select all the files except rootfs and swap (tip: you can hold down control and click on the files to select multiple files at once!).
 

Once the other files are highlighted, click and drag them from the right to the left.  

Cool, now that you have backed up your files to your computer, we need to place them in a different part on the xbox. Click the Up Folder located next to the start on the top right side of the window, keep clicking it till you get up to the root of the ftp. double click on your f drive (or E drive if you have your apps installed in there).

under the F Drive, double click the Apps folder, and then Mediaplayers.

we now need to create a directory to hold Mythtv in it, right click in the right windows and select make folder, name it mythtv

click ok, and double click the new mythv folder.

now drag all the files from your computers mythtv folder over to the xbox's mythtv folder. (drag all the files from the left to the right)

Good, we are almost done, now we need to edit the evox.ini file which tells your dashboard where mythtv is located, click the folderup icon (next to the star in the top right part of flash fxp)
 

and go to the root folder of your xbox (the one with all the drive letters). Double Click on the C Drive. and right click on the evox.ini file - select edit.

Scroll down till you see a section called Mediaplayers

Section "Mediaplayers"
  {
      Line "--- Mediaplayers ---",1
     Line "",1
                Item "Xbox Media Center - XBMC","f:\Apps\Mediaplayer\XBMC\default.xbe"
                Item "Xbox Media Center - XBMC2","f:\Apps\Mediaplayer\XBMC2\default.xbe"
  Line "----------------------------",1
  Item "MS-Dashboard - Audio/DVDPlayer","c:\xboxdash.xbe"
  Item "DVDX - Region Free/Dongle Free DVD Player","f:\apps\DVDX\default.xbe"
  Line "----------------------------",1
  }

we need to edit this line, and add some more info into it.

Section "Mediaplayers"
  {
      Line "--- Mediaplayers ---",1
     Line "",1
                Item "Xbox Media Center - XBMC","f:\Apps\Mediaplayer\XBMC\default.xbe"
                Item "Myth TV","f:\apps\mediaplayer\mythtv\default.xbe"
  Line "----------------------------",1
  Item "MS-Dashboard - Audio/DVDPlayer","c:\xboxdash.xbe"
  Item "DVDX - Region Free/Dongle Free DVD Player","f:\apps\DVDX\default.xbe"
  Line "----------------------------",1
  }

You can see in the above is how i edited mine, make sure the file path matches where you have the file located on your xbox, ie: f:\apps\mediaplayer\mythtv\default.xbe. If your doing the install on the e drive (ie small hd install) edit this to reflect that.

once this edit has been made, click on file (at the top) and save, and close that window. you will be prompted to upload the new file, click Yes.

Awesome, now reboot your xbox (either power it off and on again, or use the menu system to reboot it)

once your box comes back up, you should see a new item in the Mediaplayers menu - Myth TV!

launch it, and it should launch mythtv from the HD now instead of trying to do it off the DVD rom.