Followed the coreboot wiki entry perfectly, and had no issues reading the flash chip.
The 4MB Bios chip in my x1 differs from the Wiki Entry:
Found Micron/Numonyx/ST flash chip "N25Q032..3E" (4096 kB, SPI) on linux_spi.
Not sure if that impacts anything, however booting I am faced with a Black Screen. Fan is not running at all, and appears nothing is happening.
I found this link as well: http://coreboot.coreboot.narkive.com/zUOsG1zN/lenovo-x1-carbon-3460-screen-s...
Flashed the rom at the end of the suggested mailing list comment, and still black screen.
I have included the vbios in my build, so I'm not sure what's wrong.
-realraw