Date: Tue, 16 Aug 2022 14:10:15 +0300 From: Toomas Soome <tsoome@me.com> To: Nuno Teixeira <eduardo@freebsd.org> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: 24.3. Updating Bootcode Message-ID: <62B26DE1-0E26-40BA-8647-E591E9ACEB7A@me.com> In-Reply-To: <CAFDf7UJv9QCuD27XDs2ihLiN21Rn6PeZjbJtWVOAAfHb8HHnHw@mail.gmail.com> References: <CAFDf7UJv9QCuD27XDs2ihLiN21Rn6PeZjbJtWVOAAfHb8HHnHw@mail.gmail.com>
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> On 16. Aug 2022, at 12:49, Nuno Teixeira <eduardo@freebsd.org> wrote: >=20 > Hello all, >=20 > With so much discussion about updating boot, I feel confused about the = correct procedure of doing it. >=20 > Like being said there are a "24.3. Updating Bootcode" in Handbook = (WIP) that points to some important manuals. >=20 > There are 3 places where boot loader are: >=20 > ESP (EFI System Partition): > 1 - (/boot/efi)/efi/boot/bootXXX.efi (default location) > 2 - (/boot/efi)/efi/freebsd/loader.efi (FreeBSD reserved area) > Operating System: > 3 - /boot/loader.efi >=20 > For what I've read we should: > - backup: `cp /boot/efi/efi/boot/bootXXX.efi = /boot/efi/efi/boot/bootXXX.efi.bkp` > - update: `cp /boot/loader.efi /boot/efi/efi/boot/bootXXX.efi` >=20 > In this example we have a /boot/efi mount by the system, "/dev/XXXpN = on /boot/efi (msdosfs, local)". >=20 > What about (/boot/efi)/efi/freebsd/loader.efi (reserved area)? Is = necessary to backup and update it too? >=20 Hi! I guess we need to expain a bit. EFI System Partition (ESP from now on, = <ESP> for mountpoint), can store both EFI boot programs and EFI = applications (diagnostics, firmware update etc). This is the reason, the = ESP size is not specified in UEFI specification. EFI Boot program may be stored on default path = <ESP>/efi/boot/bootx64.efi (amd64), <ESP>/efi/boot/bootia32.efi (i386 = 32-bit), <ESP>/efi/boot/bootaarch64.efi for AARCH64 etc. It is default = for case there is no UEFI Boot Manager set up for this media (like = installation media on usb stick or cdrom, but also most systems support = it with hdd). Default path obviously does not cope with multi boot setups. For better OS support, the UEFI specification (UEFI 2.8A Feb 14, page = 499) is suggesting to use structure like: <ESP>/efi/<OS>/=E2=80=A6 And to use this suggestion, it means the UEFI Boot Manager needs to be = configured (see efibootmgr(8)). Therefore, once you have set up OS specific setup, there is no use for = default (<ESP>/efi/boot/=E2=80=A6) and you need to update one or = another, but not both. hope this helps, toomas
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