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Initial support for implementing the bootXXX.efi workaround

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Too many version of UEFI firmware (so far only confirmed on amd64)
don't really support efibootmgr selection of boot. That's the most
reliable, when it works, since there's no guesswork. However, many do
not save, unmolested, the variables that efibootmgr sets, so as a
fallback we also install loader.efi as bootXXX.efi (where XXX is
either aa64 or x64) if it doesn't already exist in /efi/boot on the
ESP. The standard only defines this for removable devices, but it's
almost ubiquitously used as a fallback. Many BIOSes implement a drive
selection feature that takes over the efibootmgr protocol, rendinering
it useless (either generally, or for those vendors not on the short
list). bootxxx.efi works around this. However, we don't install it
unconditionally there, as that breaks some popular multi-boot setups.

MFC After: 1 week
Differential Revision: https://reviews.freebsd.org/D26428
This commit is contained in:
Warner Losh 2020-10-09 00:16:26 +00:00
parent 42f96162c3
commit c6d56081c9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=366554
1 changed files with 24 additions and 0 deletions
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24
usr.sbin/bsdinstall/scripts/bootconfig
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@ -124,6 +124,15 @@ if [ "$(uname -m)" = "arm64" ] || [ "$X86_BOOTMETHOD" = "UEFI" ]; then
done
fi
case $(uname -m) in
arm64) ARCHBOOTNAME=aa64 ;;
amd64) ARCHBOOTNAME=x64 ;;
# arm) ARCHBOOTNAME=arm ;; # No other support for arm install
# i386) ARCHBOOTNAME=ia32 ;; # no support for this in i386 kernels, rare machines
*) die "Unsupported arch $(uname -m) for UEFI install"
esac
BOOTNAME="/EFI/BOOT/BOOT${ARCHBOOTNAME}.EFI"
for esp in $ESPS; do
f_dprintf "Formatting /dev/${esp} as FAT32"
newfs_msdos -F 32 -c 1 -L EFISYS "/dev/$esp" > /dev/null 2>&1
@ -142,6 +151,21 @@ if [ "$(uname -m)" = "arm64" ] || [ "$X86_BOOTMETHOD" = "UEFI" ]; then
mkdir -p "$mntpt/EFI/freebsd"
cp "$BSDINSTALL_CHROOT/boot/loader.efi" "${mntpt}/EFI/freebsd/loader.efi"
#
# The following shouldn't be necessary. UEFI defines a way to
# specifically select what to boot (which we do via
# efibootmgr). However, virtual environments often times lack
# support for the NV variables efibootmgr sets. In addition,
# some UEFI implementations have features that interfere with
# the setting of these variables. To combat that, we install the
# default removable media boot file as a fallback if it doesn't
# exist. We don't install it all the time since that can
# interfere with other installations on the drive (like rEFInd).
#
if [ ! -f "${mntpt}/${BOOTNAME}" ]; then
cp "$BSDINSTALL_CHROOT/boot/loader.efi" "${mntpt}/${BOOTNAME}"
fi
if [ "$num_esps" -gt 1 ]; then
bootlabel="FreeBSD (${esp})"
else