Date: Tue, 19 Dec 2017 09:58:04 -0800 From: Mark Millard <markmi@dsl-only.net> To: Warner Losh <imp@bsdimp.com> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: UEFI booting survey Message-ID: <DC81F8EE-FE36-4B4B-8A51-B9C0D7D6B727@dsl-only.net> In-Reply-To: <CANCZdfo5=5vKZ2cY8k7K3L%2BbfEPQREr9yB=EsVPiMkAStCq_SA@mail.gmail.com> References: <60C20606-853E-43AE-9F90-44C65026A098@dsl-only.net> <CANCZdfo5=5vKZ2cY8k7K3L%2BbfEPQREr9yB=EsVPiMkAStCq_SA@mail.gmail.com>
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On 2017-Dec-18, at 2:37 PM, Warner Losh <imp at bsdimp.com> wrote: > . . . >=20 > Or the following pseudo-code with all the weird special cases removed = for clarity >=20 > load loader.efi from ESP > if BootXXXX uefi variable holds a second path, use that for = root/kernel > otherwise if an override variable holds a kernel/root path, use that > otherwise scan for a usable ZFS pool, use that if it exists > otherwise use the same partition loader.efi was booted from for = root/kernel if it's usable > otherwise use the first UFS partition on the ESP that's usable. >=20 > A partition is usable if /boot/loader.rc exists on that path. What will be the role of /etc/fstab in establishing were the kernel is loaded from? Where world is loaded from? Where/how does use of /etc/fstab for specifying the root file system mount fit in the above pseudo-code? (For my particular interest the context uses UFS, not ZFS.) > What is being deleted is one final step: "otherwise use the first UFS = partition on any drive in a random order that's usable." which used to = be at the end of the boot1.efi psuedo code. It's my belief that no such = installations actually use this due to the random factor today (plug in = a new USB drive and it might take over). If my belief is wrong, it's my = belief that efibootmgr will solve it, and failing that, the fallback = mechanism (for platforms that use u-boot + EFI where UEFI variables = don't work) will allow the two or three people that are doing this = today. =3D=3D=3D Mark Millard markmi at dsl-only.net
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