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D46384.id142271.diff
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diff --git a/stand/man/loader.efi.8 b/stand/man/loader.efi.8
--- a/stand/man/loader.efi.8
+++ b/stand/man/loader.efi.8
@@ -30,7 +30,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd November 22, 2023
+.Dd August 20, 2024
.Dt LOADER.EFI 8
.Os
.Sh NAME
@@ -355,41 +355,96 @@
The following example shows how to install a new
.Nm
on the ESP.
+The exact placement is complicated due to the diversity of
+installations, setups and situations.
+In this section, paths that are all lower case are Unix paths.
+Paths that are all upper case are relative to the ESP mount point,
+though they may appear as lower case on your system because the
+FAT filesystem of the ESP is case insensitive.
.Pp
-First, find the partition of type
+Locate the ESP, which has its own partition type of
.Dq efi :
.Bd -literal -offset indent
-# gpart list | grep -Ew '(Name|efi)'
-1. Name: nvd0p1
- type: efi
-2. Name: nvd0p2
-3. Name: nvd0p3
-4. Name: nvd0p4
-1. Name: nvd0
+# gpart show nda0
+sudo gpart show nda0
+=> 40 7501476448 nda1 GPT (3.5T)
+ 40 614400 1 efi (300M)
+ 614440 7500862048 2 freebsd-zfs (3.5T)
.Ed
.Pp
The name of the ESP on this system is
-.Pa nvd0p1 .
+.Pa nda0p1 .
+By default, this will be mounted on
+.Pa /boot/efi .
+To check
+.Bd -literal -offset indent
+# mount | grep nda0p1
+/dev/nda0p1 on /boot/efi (msdosfs, local)
+.Ed
+if it's not mounted, you will need to mount it:
+.Bd -literal -offset indent
+# mount_msdosfs /dev/nda1p1 /boot/efi
+.Ed
+.Pp
+.Xr efibootmgr 8
+reports what we booted from.
+.Bd -literal -offset indent
+# efibootmgr -v
+Boot to FW : false
+BootCurrent: 0001
+Timeout : 2 seconds
+BootOrder : 0000, 0001, 0003, 0004, 0005, 0006, 0001, 0008, 000A, 000B, 000C, 000E, 0007
+...
++Boot0001* FreeBSD ZPOOL HD(1,GPT,b5d0f86b-265d-1e1b-18aa-0ed55e1e73bd,0x28,0x96000)/File(\EFI\FREEBSD\LOADER.EFI)
+ nda0p1:/EFI/FREEBSD/LOADER.EFI /boot/efi//EFI/FREEBSD/LOADER.EFI
+...
+.Ed
+Often there are several options, depending on the BIOS.
+The entry that we booted with is marked with a
+.Sq +
+at the start of the line, as shown above.
+So in this case, this firmware is using
+.Pa /EFI/FREEBSD/LOADER.EFI
+from the ESP.
+Often times it will be the UEFI
+.Dq default
+loader, which varies by architecture.
+.Bl -column -offset indent "Architecture" "Default Path"
+.It Sy Architecture Ta Sy Default Path
+.It amd64 Ta Pa /EFI/BOOT/BOOTX64.EFI
+.It arm Ta Pa /EFI/BOOT/BOOTARM.EFI
+.It arm64 Ta Pa /EFI/BOOT/BOOTAA64.EFI
+.It i386 Ta Pa /EFI/BOOT/BOOTIA32.EFI
+.It riscv Ta Pa /EFI/BOOT/BOOTRISCV64.EFI
+.El
+However, care must be taken: some multiple-boot environments rely on a special
+.Pa bootXXX.efi
+to function.
+Before updating a
+.Pa bootXXX.efi
+file, make sure it is the FreeBSD boot loader before updating it:
+.Bd -literal -offset indent
+# strings /boot/efi/EFI/BOOT/BOOTX64.EFI | grep FreeBSD | grep EFI
+FreeBSD/amd64 EFI loader, Revision 3.0
+.Ed
+.Pp
+Copy the loader:
+.Bd -literal -offset indent
+# cp /boot/loader.efi /boot/efi/EFI/FREEBSD/LOADER.EFI
+.Ed
+replacing the all caps part of the example with the proper path.
.Pp
-Second, let's mount the ESP, copy
-.Nm
-to the special location reserved for
-.Fx
-EFI loaders, and unmount once finished:
.Bd -literal -offset indent
-# mount_msdosfs /dev/nvd0p1 /boot/efi
-# cp /boot/loader.efi /boot/efi/efi/freebsd/loader.efi
+# umount /boot/efi
+.Ed
+Finally, if you mounted the ESP, you may wish to unmount it.
+.Bd -literal -offset indent
# umount /boot/efi
.Ed
.Sh SEE ALSO
.Xr loader 8 ,
.Xr uefi 8
.Sh BUGS
-Systems that do not have a
-.Dv ConOut
-variable set are not conformant with the standard, and likely have unexpected
-results.
-.Pp
Non-x86 serial console handling is even more confusing and less well documented.
.Pp
Sometimes when the serial port speed isn't set, 9600 is used.
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