So, if I understand correctly, you were able to boot without problems using the boot code "text"?
Were you able to download the extension using "tce-load -wil Xorg-7.5-3d" successfully? From memory, this will download the extension but not load it.
Note the following:
1. With an intel graphics chipset, I doubt that xorg will start without a valid xorg.conf - i.e. it will not work "config-less"
2. With an intel graphics chipset, it is quite possible that Xvesa will only work at 640x480x16 or 1024x768x16 without resorting to 915resolution or similar.
3. Loading the Xorg-7.5-3d extension will cause the i915 kernel driver to load and will switch the kernel graphics mode. If this works correctly, you will see the fonts in text mode get much smaller. If it does not work, you will quite probably see the kinds of errors you describe.
Given the above, I would suggest you start by booting using the "text" code and then run xsetup.sh to set resolution to 640x480x16 and "startx", if this works, try 1024x768x16. If both work, you could quite possibly get 915resolution to give you the native resolution for your screen.