BTX halted

I have a FreeSBIE image on USB ``thumb drive''.
It was created using ``make flash''.
This work fine (thanks!) on some systems, but on others,
The loader dies.  I understand this to be a
problem with src/sys/boot/i386/btx (real mode vs. vm86 mode)
and the suggested workaround is to use GRUB.

Has anyone come up with a cook-book way to do this?

Thanks in advance,
doug

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