Just did a fresh install of 11.1, afterwards system wouldn't find a bootable disk. Found mention of similar issue in 11.0 errata. Applied 'gpart set -a active ada0' and voila, system would boot from disk. Looks like I have yet another example of a system that needs the fix.
# kenv -q smbios.planar.maker
# kenv -q smbios.planar.product
I am unable to find the similar reference in the 11.X errata. Can you please point me to that document? Thanks.
[2016-10-20] Several recent Dell systems fail to find a bootable disk when the system boots in Legacy/BIOS/CSM mode, the boot disk is partitioned with GPT, and the Active flag in the Protective MBR is not set. To work around this issue, either configure the system to boot in UEFI mode, or choose the "GPT + Active" scheme. [r293860]