[Bug 245348] [loader] [memstick] Loader on mini-memstick boots an unexpected kernel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245348

            Bug ID: 245348
           Summary: [loader] [memstick] Loader on mini-memstick boots an
                    unexpected kernel
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: bsdpr at phoe.frmug.org

The loader provided on FreeBSD-12.1-RELEASE-amd64-mini-memstick.img loads and
boots an unexpected kernel when the host has a bootable zpool on another disk.
I expected that booting from the memstick would bring me the installer but I
got the main OS instead. This is extremely inconvenient since I use these USB
sticks as a troubleshooting or disaster recovery tool.
The currdev and loaddev variables are equal and point to the HDD pool but not
to the USB thumb drive from which the loader was read.

OK lsdev                                                                        
disk devices:                                                                   
    disk0:   BIOS drive C (78165360 X 512):                                     
      disk0p1: FreeBSD boot                                                     
      disk0p2: FreeBSD ZFS                                                      
    disk1:   BIOS drive D (7814037168 X 512):                                   
      disk1p1: FreeBSD boot                                                     
      disk1p2: FreeBSD swap                                                     
      disk1p3: FreeBSD ZFS                                                      
    disk2:   BIOS drive E (7814037168 X 512):                                   
      disk2p1: FreeBSD boot                                                     
      disk2p2: FreeBSD swap                                                     
      disk2p3: FreeBSD ZFS                                                      
zfs devices:                                                                    
    zfs:asroot                  

The thumb drive is not listed, asroot is pulled from disk0.

11.3 memstick correctly load and boot the kernel from the thumb drive.

The host is an HP ML10 v2 server with firmware revision J10 in BIOS mode.

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