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domenico
147
target/linux/mediatek/image/gen_mtk_mmc_img.sh
Executable file
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target/linux/mediatek/image/gen_mtk_mmc_img.sh
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#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0-only
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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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# 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_MTK_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 | ( MTK_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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