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UEFI: add minimal grub.cfg to fat32 partition 

On some UEFI implementations, like the AMI found in the Supermicro
X10SDV-TP8F development board, the fat32 partition will be loaded
first and so Grub will set it the root, and then drop to the console
as it cannot find any config on it.
Add a minimal grub.cfg that allows Grub to find the main config on
the ISO 9660 partition and load it.
Closes: #892406
This commit is contained in:
Luca Boccassi 2018-02-27 19:23:41 +00:00
parent 0effdbd8ef
commit ac3ed23638
1 changed files with 26 additions and 1 deletions
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27
scripts/build/binary_grub-efi
View File

@ -133,6 +133,21 @@ case "${LB_ARCHITECTURES}" in
esac
# On some platforms the EFI grub image will be loaded, so grub's root
# variable will be set to the EFI partition. This means that grub will
# look in that partition for a grub.cfg file, and even if it finds it
# it will not be able to find the vmlinuz and initrd.
# Drop a minimal grub.cfg in the EFI partition that sets the root and prefix
# to whatever partition holds the /live/vmlinuz image, and load the grub
# config from that same partition.
# This is what the Ubuntu livecd already does.
mkdir -p ${_CHROOT_DIR}/grub-efi-temp-cfg
cat >${_CHROOT_DIR}/grub-efi-temp-cfg/grub.cfg <<EOF
search --set=root --file /live/vmlinuz
set prefix=(\\\$root)/boot/grub
configfile (\\\$root)/boot/grub/grub.cfg
EOF
# The code below is adapted from tools/boot/jessie/boot-x86
# in debian-cd
@ -143,10 +158,14 @@ esac
# the case of a multi-arch amd64/i386 image
size=0
for file in ${_CHROOT_DIR}/grub-efi-temp/efi/boot/boot*.efi; do
for file in ${_CHROOT_DIR}/grub-efi-temp/efi/boot/boot*.efi \
${_CHROOT_DIR}/grub-efi-temp-cfg/grub.cfg; do
size=\$((\$size + \$(stat -c %s "\$file")))
done
# directories: efi efi/boot boot boot/grub
size=\$((\$size + 4096 * 4))
blocks=\$(((\$size / 1024 + 55) / 32 * 32 ))
rm -f ${_CHROOT_DIR}/grub-efi-temp/boot/grub/efi.img
@ -155,6 +174,11 @@ mmd -i "${_CHROOT_DIR}/grub-efi-temp/boot/grub/efi.img" ::efi
mmd -i "${_CHROOT_DIR}/grub-efi-temp/boot/grub/efi.img" ::efi/boot
mcopy -o -i "${_CHROOT_DIR}/grub-efi-temp/boot/grub/efi.img" ${_CHROOT_DIR}/grub-efi-temp/efi/boot/boot*.efi \
"::efi/boot"
mmd -i "${_CHROOT_DIR}/grub-efi-temp/boot/grub/efi.img" ::boot
mmd -i "${_CHROOT_DIR}/grub-efi-temp/boot/grub/efi.img" ::boot/grub
mcopy -o -i "${_CHROOT_DIR}/grub-efi-temp/boot/grub/efi.img" ${_CHROOT_DIR}/grub-efi-temp-cfg/grub.cfg \
"::boot/grub"
END
case "${LB_BUILD_WITH_CHROOT}" in
@ -186,6 +210,7 @@ cp -r chroot/grub-efi-temp/* binary/
rm -rf chroot/grub-efi-temp-x86_64-efi
rm -rf chroot/grub-efi-temp-i386-efi
rm -rf chroot/grub-efi-temp-arm64-efi
rm -rf chroot/grub-efi-temp-cfg
rm -rf chroot/grub-efi-temp
# We rely on: binary_loopback_cfg to generate grub.cfg and other configuration files