generate-fat.sh revision 293429
1#!/bin/sh 2 3# This script generates the dummy FAT filesystem used for the EFI boot 4# blocks. It uses newfs_msdos to generate a template filesystem with the 5# relevant interesting files. These are then found by grep, and the offsets 6# written to a Makefile snippet. 7# 8# Because it requires root, and because it is overkill, we do not 9# do this as part of the normal build. If makefs(8) grows workable FAT 10# support, this should be revisited. 11 12# $FreeBSD: head/sys/boot/efi/boot1/generate-fat.sh 293429 2016-01-08 17:33:34Z emaste $ 13 14FAT_SIZE=1600 #Size in 512-byte blocks of the produced image 15 16BOOT1_SIZE=128k 17 18# 19# Known filenames 20# amd64: BOOTx64.efi 21# arm64: BOOTaa64.efi 22# arm: BOOTarm.efi 23# i386: BOOTia32.efi 24# 25if [ -z "$2" ]; then 26 echo "Usage: $0 arch boot-filename" 27 exit 1 28fi 29 30ARCH=$1 31FILENAME=$2 32 33# Generate 800K FAT image 34OUTPUT_FILE=fat-${ARCH}.tmpl 35 36dd if=/dev/zero of=$OUTPUT_FILE bs=512 count=$FAT_SIZE 37DEVICE=`mdconfig -a -f $OUTPUT_FILE` 38newfs_msdos -F 12 -L EFI $DEVICE 39mkdir stub 40mount -t msdosfs /dev/$DEVICE stub 41 42# Create and bless a directory for the boot loader 43mkdir -p stub/efi/boot 44 45# Make a dummy file for boot1 46echo 'Boot1 START' | dd of=stub/efi/boot/$FILENAME cbs=$BOOT1_SIZE count=1 conv=block 47 48umount stub 49mdconfig -d -u $DEVICE 50rmdir stub 51 52# Locate the offset of the fake file 53BOOT1_OFFSET=$(hd $OUTPUT_FILE | grep 'Boot1 START' | cut -f 1 -d ' ') 54 55# Convert to number of blocks 56BOOT1_OFFSET=$(echo 0x$BOOT1_OFFSET | awk '{printf("%x\n",$1/512);}') 57 58# Record maximum boot1 size in bytes 59case $BOOT1_SIZE in 60*k) 61 BOOT1_MAXSIZE=$(expr ${BOOT1_SIZE%k} '*' 1024) 62 ;; 63*) 64 BOOT1_MAXSIZE=$BOOT1_SIZE 65 ;; 66esac 67 68echo '# This file autogenerated by generate-fat.sh - DO NOT EDIT' > Makefile.fat 69echo "# \$FreeBSD\$" >> Makefile.fat 70echo "BOOT1_OFFSET=0x$BOOT1_OFFSET" >> Makefile.fat 71echo "BOOT1_MAXSIZE=$BOOT1_MAXSIZE" >> Makefile.fat 72 73bzip2 $OUTPUT_FILE 74echo 'FAT template boot filesystem created by generate-fat.sh' > $OUTPUT_FILE.bz2.uu 75echo 'DO NOT EDIT' >> $OUTPUT_FILE.bz2.uu 76echo "\$FreeBSD\$" >> $OUTPUT_FILE.bz2.uu 77 78uuencode $OUTPUT_FILE.bz2 $OUTPUT_FILE.bz2 >> $OUTPUT_FILE.bz2.uu 79rm $OUTPUT_FILE.bz2 80 81