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.
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.
14 FAT_SIZE=1600 #Size in 512-byte blocks of the produced image
26 echo "Usage: $0 arch boot-filename"
33 # Generate 800K FAT image
34 OUTPUT_FILE=fat-${ARCH}.tmpl
36 dd if=/dev/zero of=$OUTPUT_FILE bs=512 count=$FAT_SIZE
37 DEVICE=`mdconfig -a -f $OUTPUT_FILE`
38 newfs_msdos -F 12 -L EFI $DEVICE
40 mount -t msdosfs /dev/$DEVICE stub
42 # Create and bless a directory for the boot loader
43 mkdir -p stub/efi/boot
45 # Make a dummy file for boot1
46 echo 'Boot1 START' | dd of=stub/efi/boot/$FILENAME cbs=$BOOT1_SIZE count=1 conv=block
47 # Provide a fallback startup.nsh
48 echo $FILENAME > stub/efi/boot/startup.nsh
51 mdconfig -d -u $DEVICE
54 # Locate the offset of the fake file
55 BOOT1_OFFSET=$(hd $OUTPUT_FILE | grep 'Boot1 START' | cut -f 1 -d ' ')
57 # Convert to number of blocks
58 BOOT1_OFFSET=$(echo 0x$BOOT1_OFFSET | awk '{printf("%x\n",$1/512);}')
60 # Record maximum boot1 size in bytes
63 BOOT1_MAXSIZE=$(expr ${BOOT1_SIZE%k} '*' 1024)
66 BOOT1_MAXSIZE=$BOOT1_SIZE
70 echo '# This file autogenerated by generate-fat.sh - DO NOT EDIT' > Makefile.fat
71 echo "# \$FreeBSD\$" >> Makefile.fat
72 echo "BOOT1_OFFSET=0x$BOOT1_OFFSET" >> Makefile.fat
73 echo "BOOT1_MAXSIZE=$BOOT1_MAXSIZE" >> Makefile.fat
76 echo 'FAT template boot filesystem created by generate-fat.sh' > $OUTPUT_FILE.bz2.uu
77 echo 'DO NOT EDIT' >> $OUTPUT_FILE.bz2.uu
78 echo "\$FreeBSD\$" >> $OUTPUT_FILE.bz2.uu
80 uuencode $OUTPUT_FILE.bz2 $OUTPUT_FILE.bz2 >> $OUTPUT_FILE.bz2.uu