[Bug 229770] loader.efi: 'rootdev' environment variable ignored

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229770

Torfinn Ingolfsen <tingox+freebsd@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tingox+freebsd@gmail.com

--- Comment #8 from Torfinn Ingolfsen <tingox+freebsd@gmail.com> ---
Doesn't work in FreeBSD 13.0-release-p11 either. Tested with entries like these
menuentry "FreeBSD 12" {
    icon /EFI/refind/icons/os_freebsd.png
    loader /EFI/freebsd/loader.efi
    options "rootdev=disk0p7"
}
in /boot/efi/EFI/refind/refind.conf. The entries show up in rEFInd, and I have
verified that rEFInd picks up the rootdev variable (it does). Also tried with
"rootdev=disk0p7:" doesn't change anything.

A cursory check seems to indicate that loader should have support for rootdev

root@kg-quiet:~ # strings /boot/efi/EFI/freebsd/loader.efi | grep rootdev
uefi_rootdev
rootdev
    Setting currdev to configured rootdev %s
root@kg-quiet:~ # strings /boot/loader.efi | grep rootdev
uefi_rootdev
rootdev
    Setting currdev to configured rootdev %s
root@kg-quiet:~ # strings /boot/loader_lua.efi | grep rootdev
uefi_rootdev
rootdev
    Setting currdev to configured rootdev %s

but it doesn't work. Setting currdev manually works of course.

Details:
root@kg-quiet:~ # freebsd-version -ku
13.0-RELEASE-p11
13.0-RELEASE-p11
root@kg-quiet:~ # uname -a
FreeBSD kg-quiet.kg4.no 13.0-RELEASE-p11 FreeBSD 13.0-RELEASE-p11 #0: Tue Apr 
5 18:54:35 UTC 2022    
root@amd64-builder.daemonology.net:/usr/obj/usr/src/amd64.amd64/sys/GENERIC 
amd64

root@kg-quiet:~ # ll /boot/efi/EFI/freebsd/loader.efi /boot/*.efi
-r-xr-xr-x  1 root  wheel  114176 Apr  9  2021 /boot/boot1.efi*
-rwxr-xr-x  1 root  wheel  896000 May  8 11:24
/boot/efi/EFI/freebsd/loader.efi*
-r-xr-xr-x  1 root  wheel  109056 Apr  9  2021 /boot/gptboot.efi*
-r-xr-xr-x  2 root  wheel  896000 Apr  9  2021 /boot/loader.efi*
-r-xr-xr-x  1 root  wheel  809984 Apr  9  2021 /boot/loader_4th.efi*
-r-xr-xr-x  2 root  wheel  896000 Apr  9  2021 /boot/loader_lua.efi*
-r-xr-xr-x  1 root  wheel  750080 Apr  9  2021 /boot/loader_simp.efi*

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