[Bug 235017] 12.0-RELEASE hangs at boot from official iso

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235017

            Bug ID: 235017
           Summary: 12.0-RELEASE hangs at boot from official iso
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: dpolyg at gmail.com

Created attachment 201205
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=201205&action=edit
dmesg and pciconf -lv outputs (11.2-RELEASE)

Hardware: HP ProLiant ML350-G4 (yes, it is quite old).
Boot from: FreeBSD-12.0-RELEASE-amd64-disc1.iso
Verbose boot: enabled
ACPI: enabled or disabled - doesn't matter, the result is the same.

On the screen:

Loading kernel...
/boot/kernel/kernel text=0x1678a ... (SKIPPED)
+0x19224a]
Loading configured modules...
can't find '/boot/entropy'
<-- nothing printed after the line above -->

The CD disk and USB CD drive are OK, both tested on other machines.
This machine have no problems booting and running 11.2-RELEASE.

This behavior was dicovered during attempt of updating from 
11.2-RELEASE to 12.0-RELEASE (using freebsd-update).
Interestingly, during hang after freebsd-update the
line (can't find '/boot/entropy') was _not_ printed.

Output of dmesg and pciconf (when booted in 11.2-RELEASE) are attached.

Regards,
Denis

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