Default [DEV Q]VS980 ROM Port Debugging Help

Hi all,
I am working on porting a ROM to the VS980. I am trying to get it to boot, but it sits with the kernel started on a black screen. The last_kmsg doesn't show anything that points me to a problem, but ADBD never starts so I can't logcat the boot. I am attempting to modify the stock kernel's RAMDISK and edit the init.rc to start ADBD as early as possible. Does anyone have any advice on how to extract the ramdisk? I downloaded the splitramdisk tool from here: but the zip that comes out is not gzip or lzma. I can't open it with the archive tool in linux either.

Any help here would be appreciated.
Devices: Verizon LG G3 | nVidia Shield | Motorola Xoom | 2012 Nexus 7