Date: Tue, 16 Aug 2022 11:15:19 -0600 From: Warner Losh <imp@bsdimp.com> To: Nuno Teixeira <eduardo@freebsd.org> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: 24.3. Updating Bootcode Message-ID: <CANCZdfqskq8ecroKOU=2hWNGsPTxPY-R0vHa8o-QLCgZAKFEAA@mail.gmail.com> In-Reply-To: <CAFDf7UJv9QCuD27XDs2ihLiN21Rn6PeZjbJtWVOAAfHb8HHnHw@mail.gmail.com>
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[-- Attachment #1 --] On Tue, Aug 16, 2022 at 3:49 AM Nuno Teixeira <eduardo@freebsd.org> wrote: > Hello all, > > With so much discussion about updating boot, I feel confused about the > correct procedure of doing it. > > Like being said there are a "24.3. Updating Bootcode" in Handbook (WIP) > that points to some important manuals. > > There are 3 places where boot loader are: > > ESP (EFI System Partition): > 1 - (/boot/efi)/efi/boot/bootXXX.efi (default location) > Default for the boot loader, that is. By default we don't install here anymore (though as a workaround for broken BIOSes or those that don't properly save EFI env vars or that change help to be helpful, we'll park a copy here, this usually isn't updated). > 2 - (/boot/efi)/efi/freebsd/loader.efi (FreeBSD reserved area) > This is what the boot usually uses on working systems. > Operating System: > 3 - /boot/loader.efi > This is only used when chain loaded from a legacy system that installed boot1.efi, or in some cases from a 'special needs' system that loads it from gptboot.efi. > For what I've read we should: > - backup: `cp /boot/efi/efi/boot/bootXXX.efi > /boot/efi/efi/boot/bootXXX.efi.bkp` > I'd recommend bootXXX-old.efi (or bootXXX-bkp.efi) since you'll be able to run it from the EFI shell if you are lucky enough to have one. The shell won't run the .bkp file. > - update: `cp /boot/loader.efi /boot/efi/efi/boot/bootXXX.efi` > Yes and no. You should likely update both this one and the one in efi/freebsd as well since the latter is more typically used (though your system may be one of the sadly-too-sizable number of systems that ignore the env vars and use the default removable media file). > In this example we have a /boot/efi mount by the system, "/dev/XXXpN on > /boot/efi (msdosfs, local)". > Yes. > What about (/boot/efi)/efi/freebsd/loader.efi (reserved area)? Is > necessary to backup and update it too? > It's the primary thing that gets used most of the time. I'd certainly back it up and update it. Warner [-- Attachment #2 --] <div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Aug 16, 2022 at 3:49 AM Nuno Teixeira <<a href="mailto:eduardo@freebsd.org">eduardo@freebsd.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hello all,</div><div><br></div><div>With so much discussion about updating boot, I feel confused about the correct procedure of doing it.</div><div><br></div><div>Like being said there are a "24.3. Updating Bootcode" in Handbook (WIP) that points to some important manuals.<br></div><div><br></div><div>There are 3 places where boot loader are:</div><br><div> ESP (EFI System Partition):</div><div>1 - (/boot/efi)/efi/boot/bootXXX.efi (default location)</div></div></blockquote><div><br></div><div>Default for the boot loader, that is. By default we don't install here anymore (though as a workaround</div><div>for broken BIOSes or those that don't properly save EFI env vars or that change help to be helpful,</div><div>we'll park a copy here, this usually isn't updated).</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>2 - (/boot/efi)/efi/freebsd/loader.efi (FreeBSD reserved area)</div></div></blockquote><div><br></div><div>This is what the boot usually uses on working systems.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Operating System:<br></div><div>3 - /boot/loader.efi</div></div></blockquote><div><br></div><div>This is only used when chain loaded from a legacy system that installed boot1.efi, or in some cases</div><div>from a 'special needs' system that loads it from gptboot.efi.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>For what I've read we should:</div><div> - backup: `cp /boot/efi/efi/boot/bootXXX.efi /boot/efi/efi/boot/bootXXX.efi.bkp`</div></div></blockquote><div><br></div><div>I'd recommend bootXXX-old.efi (or bootXXX-bkp.efi) since you'll be able to run it from the EFI shell</div><div>if you are lucky enough to have one. The shell won't run the .bkp file.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div> - update: `cp /boot/loader.efi /boot/efi/efi/boot/bootXXX.efi`</div></div></blockquote><div><br></div><div>Yes and no. You should likely update both this one and the one in efi/freebsd as well since the latter</div><div>is more typically used (though your system may be one of the sadly-too-sizable number of systems</div><div>that ignore the env vars and use the default removable media file).</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>In this example we have a /boot/efi mount by the system, "/dev/XXXpN on /boot/efi (msdosfs, local)".</div></div></blockquote><div><br></div><div>Yes.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>What about (/boot/efi)/efi/freebsd/loader.efi (reserved area)? Is necessary to backup and update it too?</div></div></blockquote><div><br></div><div>It's the primary thing that gets used most of the time. I'd certainly back it up and update it.</div><div><br></div><div>Warner </div></div></div>home | help
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