Is it possible to disable da0?

[Craig Leres]

I have a couple of foxconn netboxes that have SD slots that the system 
configures as da0. Starting with FreeBSD 11 we see a wad of syslog 
messages from devd every few seconds:

     Aug 29 16:57:39 xxx.lbl.gov devd: Processing event '!system=CAM 
subsystem=periph type=error device=da0 serial="20090516388200000" 
cam_status="0xcc" scsi_status=2 scsi_sense="70 02 3a 00" CDB="00 00 00 
00 00 00 " '
     Aug 29 16:57:39 xxx.lbl.gov devd: Pushing table
     Aug 29 16:57:39 xxx.lbl.gov devd: Processing notify event
     Aug 29 16:57:39 xxx.lbl.gov devd: Popping table

This is apparently because the slot doesn't not contain media. We don't 
use SD cards with these systems so I tried adding:

     hint.da.0.disabled="1"

to /boot/device.hints but /dev/da0 is still present after a reboot. 
Where am I going wrong?

		Craig
% uname -a
FreeBSD xxx.lbl.gov 11.2-RELEASE-p2 FreeBSD 11.2-RELEASE-p2 #2 r10: Wed 
Aug 15 09:23:29 PDT 2018 
leres at steel.lbl.gov:/usr/src/sys/amd64/compile/LBLNET  amd64