Date: Sun, 14 Jun 2026 16:29:18 +0000 From: Ahmad Khalifa <vexeduxr@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 2e1f5b78976a - main - loader.efi(8): document the ia32 loader Message-ID: <6a2ed6de.416e7.493ab136@gitrepo.freebsd.org>
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The branch main has been updated by vexeduxr: URL: https://cgit.FreeBSD.org/src/commit/?id=2e1f5b78976ad09bee41e602e75e79a0c3892e59 commit 2e1f5b78976ad09bee41e602e75e79a0c3892e59 Author: Ahmad Khalifa <vexeduxr@FreeBSD.org> AuthorDate: 2026-06-14 16:26:30 +0000 Commit: Ahmad Khalifa <vexeduxr@FreeBSD.org> CommitDate: 2026-06-14 16:26:30 +0000 loader.efi(8): document the ia32 loader Reviewed by: kib MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D57569 --- stand/man/loader.efi.8 | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/stand/man/loader.efi.8 b/stand/man/loader.efi.8 index ff43cbefe9bd..8ddc869e0a27 100644 --- a/stand/man/loader.efi.8 +++ b/stand/man/loader.efi.8 @@ -373,6 +373,18 @@ command produces a fault in the environment for testing purposes, by executing the .Ic ud2 processor instruction. +.Ss i386 firmware on amd64 machines +Some devices have 64-bit (long mode) capable CPUs, but come with a +32-bit (protected mode) UEFI implementation. +.Pa /boot/loader_ia32.efi +is provided for such devices. +It switches to long mode right before executing the kernel. +Note that since the firmware expects its runtime EFI functions to be +executed in 32-bit protected mode, EFI runtime services are not +available to the kernel. +Which means that programs like +.Xr efibootmgr 8 +will not work. .Sh FILES .Bl -tag -width "/boot/loader.efi" .It Pa /boot/loader.efihome | help
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