From owner-freebsd-current@freebsd.org  Wed May 23 21:51:40 2018
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 (Smail #157) id m1fLbfT-0000H1C; Wed, 23 May 2018 23:51:35 +0200
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To: Johannes Lundberg <johalun0@gmail.com>
Cc: FreeBSD Current <freebsd-current@freebsd.org>,
 Andreas Nilsson <andrnils@gmail.com>
Subject: Re: Boot USB memstick with MBR (WAS: Re: [RFC] Deprecation and
 removal of the drm2 driver) 
From: Philip Homburg <pch-fbsd-1@u-1.phicoh.com>
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In-reply-to: Your message of "Wed, 23 May 2018 13:20:42 +0100 ."
 <CAECmPwvw4c-zUkaPLsEuaH9ZT2hQUrHqgMTQLmuJBT6x+0bSag@mail.gmail.com> 
Date: Wed, 23 May 2018 23:51:35 +0200
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I tried both FreeBSD-11.2-BETA2-amd64-bootonly.iso.xz and 
FreeBSD-11.2-BETA2-amd64-mini-memstick.img.xz on a Dell PowerEdge 2950 
BIOS version 2.7.0. With both images, the USB stick is not recognized.

For reference I tried an image for a random other OS and in that case the
USB stick is recognized.

I'll try to experiment a bit to see if I can find what causes the issue.