Comment 445 for bug 1734147

This particular bug cannot affect Dell XPS 13 9350 as it is based on Skylake and the intel-spi driver does not even support it.

However, in order to boot Linux I think you need at least to switch the SATA controller to AHCI mode as described in:

https://wiki.archlinux.org/index.php/Dell_XPS_13_(9350)