I managed to install Yosemite on Haswell i5-4258u using the /haswell -x boot flags. However in order for mine to install I needed to use a usb wireless keyboard and mouse otherwise install would get stuck on the "turn keyboard and mouse on" screen.
However... After installation, I cannot start the machine and get constant kernel panic no matter what boot flags I use except when I boot only with the -x -v boot flags and get stuck at "Waiting for root device". I am using the patched kernel.
Acer Aspire V3-371 Ultrabook (Also known as Acer V13)
- 6GB RAM
- Intel Core i5-4258u (http://ark.intel.com/products/75990/Intel-Core-i5-4258U-Processor-3M-Cache-up-to-2_90-GHz)
- 120GB Kingston SSD (If using SSD, BIOS is already set to AHCI, BIOS advanced menu is locked so cannot check VT-D, but to my knowledge it is disabled by default as well)
- Intel Iris 5100 Graphics
Hope I helped some people with booting the installer and that someone will help me resolve my issue. Have tried every possible boot flag combination in my head for the past 2 weeks.