[Bug 254490] REGRESSION: Hybrid disc1.iso fails to boot from USB on BIOS/Legacy ThinkPads and other systems

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254490

            Bug ID: 254490
           Summary: REGRESSION: Hybrid disc1.iso fails to boot from USB on
                    BIOS/Legacy ThinkPads and other systems
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: editor at callfortesting.org

FreeBSD 13.0-BETA4 introduced a regression that prevents the use of a disc1.iso
hybrid image from being dd'd to a USB or similar device and booting, when the
system is in BIOS/Legacy mode. It produces the error:

CD Loader 1.2

Building the boot loader arguments
Looking up /BOOT/LOADER... File not found
Looking up /boot/Loader... File not found
Boot failed
_

Experienced on:

ThinkPad X230 (multiple)
ThinkPad T430
ThinkPad T400
ACER 1410
Dell e5470

Confirmed on 13.0-RC1 through RC3.

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