Date: Thu, 17 Mar 2022 09:19:38 -0400 From: Karl Denninger <karl@denninger.net> To: freebsd-fs@freebsd.org Subject: Hybrid partition tables -- can gpart make them? Message-ID: <68449cab-c5d7-47ff-99e1-d0e6963374d0@denninger.net>
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First, the "why" -- I wish to have *two* OS partitions, a data partition
and a config partition under NanoBSD on a Pi3 or 4. Both boot using EFI
and the "3", at least, appears to refuse to do so off a GPT-labeled
disk. This means I need *five* slices and MBR can only do 4.
I attempted to have one slice be "Freebsd" with the two OS partitions
inside it, which would work *except* it doesn't because I can't set
"bootme" on those; the EFI loader always finds the first usable UFS
partition and boots it. I need to be able to toggle that to boot the
*second* partition.
I've replaced boot1.efi (quite some time ago) with loader_lua.efi in the
EFI partition. This works, but there does not appear to be a way to
tell it that I want it to default to something other than the first
bootable partition it finds.
The intent is to enable the capability to upgrade the OS without having
to wipe/reload the card the unit boots from, then set the other
partition as the "next boot." This works quite nicely with nanoBSD
generally for MBR-bootable devices (and I use it with the pcEngines
boards), but doesn't on the Pi due to requiring the EFI partition which
means I run out of slots, never mind that the loader will still find and
boot the first one.
--
Karl Denninger
karl@denninger.net
/The Market Ticker/
/[S/MIME encrypted email preferred]/
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<p>First, the "why" -- I wish to have *two* OS partitions, a data
partition and a config partition under NanoBSD on a Pi3 or 4.
Both boot using EFI and the "3", at least, appears to refuse to do
so off a GPT-labeled disk. This means I need *five* slices and
MBR can only do 4.</p>
<p>I attempted to have one slice be "Freebsd" with the two OS
partitions inside it, which would work *except* it doesn't because
I can't set "bootme" on those; the EFI loader always finds the
first usable UFS partition and boots it. I need to be able to
toggle that to boot the *second* partition.<br>
</p>
<p>I've replaced boot1.efi (quite some time ago) with loader_lua.efi
in the EFI partition. This works, but there does not appear to be
a way to tell it that I want it to default to something other than
the first bootable partition it finds.</p>
<p>The intent is to enable the capability to upgrade the OS without
having to wipe/reload the card the unit boots from, then set the
other partition as the "next boot." This works quite nicely with
nanoBSD generally for MBR-bootable devices (and I use it with the
pcEngines boards), but doesn't on the Pi due to requiring the EFI
partition which means I run out of slots, never mind that the
loader will still find and boot the first one.</p>
<div class="moz-signature">-- <br>
Karl Denninger<br>
<a href="mailto:karl@denninger.net" class="moz-txt-link-freetext">karl@denninger.net</a><br>
<i>The Market Ticker</i><br>
<font size="-2"><i>[S/MIME encrypted email preferred]</i></font></div>
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