If you are getting to the white apple screen, that indicates to me that you have probably got the partition set up properly. The fact that it fails there may indicate a boot.efi problem, or perhaps an issue with the mach_kernel. Someone who knows more details on the boot process of Mac OS would probably be able to tell you more.
You may be able to do some google searches looking for this problem without AppleTV in the search string... You might find someone with the same symptoms with a PC running Mac OS or even with a real mac.
Oh - Another thing you can try before making the last partition changes... Try to boot your mac from the external drive.. I believe I did that several times, even though I had installed semthex's kernel and the AppleTV's boot.efi file.
Assuming the boot works at that point, make sure you do Cleanup step 2.. (Those files may be recreated since they are cache files)
I get the prohibitory sign.
Cmd v shows it loads to the itunesPhoneDriver then waiting for root device.
When you boot from the external drive (USB) does the ATV drive mount on the desktop and then are you able to easily mod the ATV drive?
If so, what would be the steps to do so?
The aTV partitions are automaticly mounted on the desktop when you boot your USB drive.
The next step would be to install SSH, and then you can easily access it remotely.
I can't get this to work!
I have tired 4 times now, doing exactly what ptaylor874 described.
When I boot the the USB drive (with Apple TV of course) I get the white Apple screen and the circle-thing, but then I get the "invalid" sign, same as DxQ described and the USB drive HDD-led stops blinking.
I have rebooted 3 times, same result...
What can I possibly be doing wrong???
I had the same problem booting up from a Lacie porche USB drive with no external power supply. I then did the install on an older USB drive with power supply and it worked like a charm! :)
I'm not one to advocate piracy of any kind. If someone does find it in their hearts to make the boot.efi file available to others (perhaps if they provide an appletv serial number to prove they own one), though, please let me know. There's got to be a way to get this without opening up every single device and voiding the warranty...
another one with the prohibitory sign here.
will keep working on it, but it sounds like there's something else that needs to be done.
I obtained another boot.efi (completely legal, of course). I'll try a new install with it + whatever other changes might work and let you know what happens. If anyone wants instructions on how to obtain a boot.efi, send me a PM.