Linux EFISTUB

First, I'd like to say thanks to the Sputnik team for their efforts.  I bought the i5/8GB/FHD version and am running Arch, kernel 4.0.4.  It's been a reasonably smooth experience so far.

Has anyone been able to boot making use of Linux's EFISTUB feature, executing the kernel directly from the firmware with no bootloader?  In my experience it almost works, but it seems like kernel arguments aren't passed and so without the root parameter or an initramfs it instantly dies a horrible death.

Is this a feature lacking from the UEFI firmware, or has anyone been able to get this to work?  In the meantime I'm booting with syslinux and all works great.

The following is the boot entry I use that fails:

# efibootmgr -c -l \\vmlinuz-linux -u 'rootfs=/dev/sda2 rw initrd=\initramfs-linux.img' -L "Arch Linux"

Thanks!