[Bug 221077] Boot from ZFS fails following freebsd-update

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221077

Warner Losh <imp at FreeBSD.org> changed:

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                 CC|                            |imp at FreeBSD.org

--- Comment #21 from Warner Losh <imp at FreeBSD.org> ---
Yes.  Due to the extreme space limitations of boot2, printf in it has been
shaved to the bone. boot2 doesn't support ZFS at all, but is only for UFS since
it lives in the UFS boot block area.

But for *gptboot, we use the printf in libsa/printf.c, which at least pretends
to support 'j' modifiers (and the pretense appears to be quite good from my
reading of it). So it's quite odd to see 'u' printed there. A quick grep of the
symbols for the .o's brought in shows they are all U. There is a zfs_printf,
but it just calls printf and returns 0.

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