build-efi.sh
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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0+
#
# Script to build an EFI thing suitable for booting with QEMU, possibly running
# it also.
# This just an example. It assumes that
# - you build U-Boot in ${ubdir}/<name> where <name> is the U-Boot board config
# - /mnt/x is a directory used for mounting
# - you have access to the 'pure UEFI' builds for QEMU
#
# UEFI binaries for QEMU used for testing this script:
#
# OVMF-pure-efi.i386.fd at
# https://drive.google.com/file/d/1jWzOAZfQqMmS2_dAK2G518GhIgj9r2RY/view?usp=sharing
# OVMF-pure-efi.x64.fd at
# https://drive.google.com/file/d/1c39YI9QtpByGQ4V0UNNQtGqttEzS-eFV/view?usp=sharing
set -e
usage() {
echo "Usage: $0 [-a | -p] [other opts]" 1>&2
echo 1>&2
echo " -a - Package up the app" 1>&2
echo " -o - Use old EFI app build (before 32/64 split)" 1>&2
echo " -p - Package up the payload" 1>&2
echo " -P - Create a partition table" 1>&2
echo " -r - Run QEMU with the image" 1>&2
echo " -s - Run QEMU with serial only (no display)" 1>&2
echo " -w - Use word version (32-bit)" 1>&2
exit 1
}
# 32- or 64-bit EFI
bitness=64
# app or payload ?
type=app
# create a partition table and put the filesystem in that (otherwise put the
# filesystem in the raw device)
part=
# run the image with QEMU
run=
# run QEMU without a display (U-Boot must be set to stdout=serial)
serial=
# before the 32/64 split of the app
old=
# Set ubdir to the build directory where you build U-Boot out-of-tree
# We avoid in-tree build because it gets confusing trying different builds
ubdir=/tmp/b/
while getopts "aopPrsw" opt; do
case "${opt}" in
a)
type=app
;;
p)
type=payload
;;
r)
run=1
;;
s)
serial=1
;;
w)
bitness=32
;;
o)
old=1
;;
P)
part=1
;;
*)
usage
;;
esac
done
run_qemu() {
extra=
if [[ "${bitness}" = "64" ]]; then
qemu=qemu-system-x86_64
bios=OVMF-pure-efi.x64.fd
else
qemu=qemu-system-i386
bios=OVMF-pure-efi.i386.fd
fi
if [[ -n "${serial}" ]]; then
extra="-display none -serial mon:stdio"
fi
echo "Running ${qemu}"
# Use 512MB since U-Boot EFI likes to have 256MB to play with
"${qemu}" -bios "${bios}" \
-m 512 \
-drive id=disk,file="${IMG}",if=none,format=raw \
-nic none -device ahci,id=ahci \
-device ide-hd,drive=disk,bus=ahci.0 ${extra}
}
setup_files() {
echo "Packaging ${BUILD}"
mkdir -p $TMP
cat >$TMP/startup.nsh <<EOF
fs0:u-boot-${type}.efi
EOF
sudo cp ${ubdir}/${BUILD}/u-boot-${type}.efi $TMP
# Can copy in other files here:
#sudo cp ${ubdir}/$BUILD/image.bin $TMP/chromeos.rom
#sudo cp /boot/vmlinuz-5.4.0-77-generic $TMP/vmlinuz
}
# Copy files into the filesystem
copy_files() {
sudo cp $TMP/* $MNT
}
# Create a filesystem on a raw device and copy in the files
setup_raw() {
mkfs.vfat "${IMG}" >/dev/null
sudo mount -o loop "${IMG}" $MNT
copy_files
sudo umount $MNT
}
# Create a partition table and put the filesystem in the first partition
# then copy in the files
setup_part() {
# Create a gpt partition table with one partition
parted "${IMG}" mklabel gpt 2>/dev/null
# This doesn't work correctly. It creates:
# Number Start End Size File system Name Flags
# 1 1049kB 24.1MB 23.1MB boot msftdata
# Odd if the same is entered interactively it does set the FS type
parted -s -a optimal -- "${IMG}" mkpart boot fat32 1MiB 23MiB
# Map this partition to a loop device
kp="$(sudo kpartx -av ${IMG})"
read boot_dev<<<$(grep -o 'loop.*p.' <<< "${kp}")
test "${boot_dev}"
dev="/dev/mapper/${boot_dev}"
mkfs.vfat "${dev}" >/dev/null
sudo mount -o loop "${dev}" $MNT
copy_files
# Sync here since this makes kpartx more likely to work the first time
sync
sudo umount $MNT
# For some reason this needs a sleep or it sometimes fails, if it was
# run recently (in the last few seconds)
if ! sudo kpartx -d "${IMG}" > /dev/null; then
sleep .5
sudo kpartx -d "${IMG}" > /dev/null || \
echo "Failed to remove ${boot_dev}, use: sudo kpartx -d ${IMG}"
fi
}
TMP="/tmp/efi${bitness}${type}"
MNT=/mnt/x
BUILD="efi-x86_${type}${bitness}"
IMG=try.img
if [[ -n "${old}" && "${bitness}" = "32" ]]; then
BUILD="efi-x86_${type}"
fi
setup_files
qemu-img create "${IMG}" 24M >/dev/null
if [[ -n "${part}" ]]; then
setup_part
else
setup_raw
fi
if [[ -n "${run}" ]]; then
run_qemu
fi