3 # Copyright © 2019 Alexey Loukianov <lx2@lexa2.ru>
4 # Copyright © 2020 David Woodhouse <dwmw2@infradead.org>
6 # This is free software, licensed under the GNU General Public License v2.
7 # See /LICENSE for more information.
10 # Generates a bootable SD card image for Banana Pi R2 (and probably
11 # other similar boards) as documented at
12 # http://www.fw-web.de/dokuwiki/doku.php?id=en:bpi-r2:storage
14 # The first sector must contain the SDMMC_BOOT header shown
15 # below, and also contains the MBR partition table in the end
16 # of the sector. The partition table must contain no active
19 # The second sector must contain the BRLYT header, and the
20 # special preloader image goes in sector 4; 2KiB into the image.
22 # The preloader loads U-Boot from sector 640; 320KiB into the image.
23 # The location and the size (512KiB) are fixed and not read from
24 # the partition table. We set up a partition for it merely for
25 # our own convenience for upgrades, etc.
27 # The second partition is a FAT file system containing the kernel
28 # image and a uboot.env file, which is provided to this script as
29 # $4 (bootfs image). Its size is configurable with the
30 # CONFIG_BANANA_PI_BOOT_PARTSIZE option; by default 32MiB.
32 # The root filesystem comes next in the third partition.
35 # ------------------------ Sector Offset
36 # | MBR + SDMMC_BOOT | 0 0x0
37 # |----------------------|
38 # | BRLYT header | 1 0x200
39 # |----------------------|
42 # |----------------------|
49 # |----------------------|
50 # | MBR partition #1 | 640 0x50000
56 # |----------------------|
57 # | MBR partition #2 |
59 # | FAT partition | ( BANANA_PI_BOOT_PARTSIZE
63 # |----------------------|
64 # | MBR partition #3 |
67 # | | ( TARGET_ROOTFS_PARTSIZE
68 # | (squashfs+overlay | default 104MiB )
72 # ------------------------
74 # For eMMC boot, everything up to and including the preloader must be
75 # written to /dev/mmcblk0boot0, with the SDMMC_BOOT header changed to
76 # read EMMC_BOOT\0 instead.
78 # The contents of the main eMMC are identical to the SD card layout,
79 # with the preloader loading 512KiB of U-Boot starting at 0x50000.
82 echo "SYNTAX: $0 sd <file> <preloader image> <u-boot image> <bootfs image> <rootfs image> <bootfs size> <rootfs size>"
83 echo " OR: $0 emmc <file> <preloader image>"
89 PRELOADER_OFFSET
=2 # 2KiB
91 SDMMC_BOOT
="SDMMC_BOOT\x00\x00\x01\x00\x00\x00\x00\x02\x00\x00"
92 EMMC_BOOT
="EMMC_BOOT\x00\x00\x00\x01\x00\x00\x00\x00\x02\x00\x00"
93 BRLYT
="BRLYT\x00\x00\x00\x01\x00\x00\x00\x00\x08\x00\x00\
94 \x00\x08\x00\x00\x42\x42\x42\x42\x08\x00\x01\x00\x00\x08\x00\x00\
95 \x00\x08\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
111 set $
(ptgen
-o $OUTPUT -h $head -s $sect -a 0 -l 1024 \
113 -t c
-p ${BOOTFSSIZE}M \
114 -t 83 -p ${ROOTFSSIZE}M
)
116 UBOOT_OFFSET
="$(($1 / 512))"
117 UBOOT_SIZE
="$(($2 / 512))"
118 BOOTFS_OFFSET
="$(($3 / 512))"
119 BOOTFS_SIZE
="$(($4 / 512))"
120 ROOTFS_OFFSET
="$(($5 / 512))"
121 ROOTFS_SIZE
="$(($6 / 512))"
123 echo -en "${SDMMC_BOOT}" |
dd bs
=1 of
="${OUTPUT}" seek
=0 conv
=notrunc
124 echo -en "${BRLYT}" |
dd bs
=1 of
="${OUTPUT}" seek
=512 conv
=notrunc
126 dd bs
=1024 if="${PRELOADER}" of="${OUTPUT}" seek="${PRELOADER_OFFSET}" conv
=notrunc
127 dd bs
=512 if="${UBOOT}" of="${OUTPUT}" seek="${UBOOT_OFFSET}" conv
=notrunc
128 dd bs
=512 if="${BOOTFS}" of="${OUTPUT}" seek="${BOOTFS_OFFSET}" conv
=notrunc
129 dd bs
=512 if="${ROOTFS}" of="${OUTPUT}" seek="${ROOTFS_OFFSET}" conv
=notrunc
130 dd bs
=128k
if=/dev
/zero of
="${OUTPUT}" count
=1 oflag
=append conv
=notrunc
133 [ $# -eq 3 ] || usage
137 echo -en "${EMMC_BOOT}" |
dd bs
=1 of
="${OUTPUT}" seek
=0
138 echo -en "${BRLYT}" |
dd bs
=1 of
="${OUTPUT}" seek
=512 conv
=notrunc
140 dd bs
=1024 if="${PRELOADER}" of="${OUTPUT}" seek="${PRELOADER_OFFSET}" conv
=notrunc