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f5cebbe2e4
This actually covers fairly much all the MediaTek platforms; they only have different images because they don't include the preloader and U-Boot, and rely on preinstalled stuff from the vendor. So this script can slowly take over the world as we complete the support for various other platforms, starting with UniElec U7623… Signed-off-by: David Woodhouse <dwmw2@infradead.org>
151 lines
4.9 KiB
Bash
Executable File
151 lines
4.9 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright © 2019 Alexey Loukianov <lx2@lexa2.ru>
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# Copyright © 2020 David Woodhouse <dwmw2@infradead.org>
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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# Generates a bootable SD card image for Banana Pi R2 (and probably
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# other similar boards) as documented at
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# http://www.fw-web.de/dokuwiki/doku.php?id=en:bpi-r2:storage
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#
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# The first sector must contain the SDMMC_BOOT header shown
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# below, and also contains the MBR partition table in the end
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# of the sector. The partition table must contain no active
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# partitions.
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#
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# The second sector must contain the BRLYT header, and the
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# special preloader image goes in sector 4; 2KiB into the image.
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#
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# The preloader loads U-Boot from sector 640; 320KiB into the image.
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# The location and the size (512KiB) are fixed and not read from
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# the partition table. We set up a partition for it merely for
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# our own convenience for upgrades, etc.
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#
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# The second partition is a FAT file system containing the kernel
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# image and a uboot.env file, which is provided to this script as
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# $4 (bootfs image). Its size is configurable with the
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# CONFIG_BANANA_PI_BOOT_PARTSIZE option; by default 32MiB.
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#
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# The root filesystem comes next in the third partition.
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#
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#
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# ------------------------ Sector Offset
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# | MBR + SDMMC_BOOT | 0 0x0
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# |----------------------|
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# | BRLYT header | 1 0x200
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# |----------------------|
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# . .
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# . .
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# |----------------------|
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# | | 4 0x800
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# | |
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# | Preloader |
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# . .
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# . .
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# | | 639
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# |----------------------|
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# | MBR partition #1 | 640 0x50000
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# | |
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# | U-Boot |
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# . .
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# . .
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# | | 1663
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# |----------------------|
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# | MBR partition #2 |
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# | |
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# | FAT partition | ( BANANA_PI_BOOT_PARTSIZE
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# . . default 32MiB )
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# . (kernel, uEnv) .
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# | |
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# |----------------------|
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# | MBR partition #3 |
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# | |
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# | Root partition |
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# | | ( TARGET_ROOTFS_PARTSIZE
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# | (squashfs+overlay | default 104MiB )
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# . or ext4, etc.) .
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# . .
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# | |
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# ------------------------
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#
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# For eMMC boot, everything up to and including the preloader must be
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# written to /dev/mmcblk0boot0, with the SDMMC_BOOT header changed to
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# read EMMC_BOOT\0 instead.
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#
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# The contents of the main eMMC are identical to the SD card layout,
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# with the preloader loading 512KiB of U-Boot starting at 0x50000.
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usage() {
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echo "SYNTAX: $0 sd <file> <preloader image> <u-boot image> <u-boot offset> <bootfs image> <rootfs image> <bootfs size> <rootfs size>"
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echo " OR: $0 emmc <file> <preloader image>"
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exit 1
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}
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set -e
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PRELOADER_OFFSET=2 # 2KiB
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SDMMC_BOOT="SDMMC_BOOT\x00\x00\x01\x00\x00\x00\x00\x02\x00\x00"
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EMMC_BOOT="EMMC_BOOT\x00\x00\x00\x01\x00\x00\x00\x00\x02\x00\x00"
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BRLYT="BRLYT\x00\x00\x00\x01\x00\x00\x00\x00\x08\x00\x00\
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\x00\x08\x00\x00\x42\x42\x42\x42\x08\x00\x01\x00\x00\x08\x00\x00\
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\x00\x08\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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case $1 in
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sd)
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[ $# -eq 9 ] || usage
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OUTPUT="$2"
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PRELOADER="$3"
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UBOOT="$4"
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UBOOTOFS="$5"
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BOOTFS="$6"
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ROOTFS="$7"
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BOOTFSSIZE="$8"
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ROOTFSSIZE="$9"
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head=4
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sect=63
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set $(ptgen -o $OUTPUT -h $head -s $sect -a 0 -l 1024 \
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-t 41 -p 512k@${UBOOTOFS} \
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-t c -p ${BOOTFSSIZE}M \
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-t 83 -p ${ROOTFSSIZE}M )
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UBOOT_OFFSET="$(($1 / 512))"
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UBOOT_SIZE="$(($2 / 512))"
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BOOTFS_OFFSET="$(($3 / 512))"
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BOOTFS_SIZE="$(($4 / 512))"
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ROOTFS_OFFSET="$(($5 / 512))"
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ROOTFS_SIZE="$(($6 / 512))"
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echo -en "${SDMMC_BOOT}" | dd bs=1 of="${OUTPUT}" seek=0 conv=notrunc
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echo -en "${BRLYT}" | dd bs=1 of="${OUTPUT}" seek=512 conv=notrunc
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# For eMMC-only boards like U7623 the preloader doesn't need to be included in the
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# main image as it's only ever needed in the eMMC boot partition.
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if [ -r ${PRELOADER} ]; then
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dd bs=1024 if="${PRELOADER}" of="${OUTPUT}" seek="${PRELOADER_OFFSET}" conv=notrunc
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fi
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dd bs=512 if="${UBOOT}" of="${OUTPUT}" seek="${UBOOT_OFFSET}" conv=notrunc
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dd bs=512 if="${BOOTFS}" of="${OUTPUT}" seek="${BOOTFS_OFFSET}" conv=notrunc
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dd bs=512 if="${ROOTFS}" of="${OUTPUT}" seek="${ROOTFS_OFFSET}" conv=notrunc
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dd bs=128k if=/dev/zero of="${OUTPUT}" count=1 oflag=append conv=notrunc
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;;
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emmc)
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[ $# -eq 3 ] || usage
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OUTPUT="$2"
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PRELOADER="$3"
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echo -en "${EMMC_BOOT}" | dd bs=1 of="${OUTPUT}" seek=0
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echo -en "${BRLYT}" | dd bs=1 of="${OUTPUT}" seek=512 conv=notrunc
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dd bs=1024 if="${PRELOADER}" of="${OUTPUT}" seek="${PRELOADER_OFFSET}" conv=notrunc
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;;
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*)
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usage
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;;
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esac
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