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31 lines
1.0 KiB
Bash
31 lines
1.0 KiB
Bash
#!/bin/sh
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#
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# This script is used only to create the "legacy" image for UniElec U7623,
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# suitable for upgrading from the vendor OpenWrt or from OpenWrt 19.07.
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#
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OUTPUT_FILE=$1
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KERNEL_FILE=$2
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RECOVERY_FILE=$3
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ROOTFS_FILE=$4
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BS=512
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# These two offsets are relative to the absolute location of the kernel on the mmc
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# (0xA00), so their position in the image is -2560 blocks
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#
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# They must be kept in sync with the default command line for U7623.
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# blkdevparts=mmcblk0:3M@6M(recovery),256M@9M(root)"
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#
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# For upgrading from the vendor firmware, the total image must fit in its
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# MTD 'firmware' partition, which is typically 36MiB.
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# In the legacy image, the uImage starts at block 0xa00. Allow 4864 KiB (9728) blocks.
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RECOVERY_OFFSET=9728
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# The recovery image is 3MiB, or 6144 blocks.
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ROOTFS_OFFSET=15872
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dd bs="$BS" of="$OUTPUT_FILE" if="$KERNEL_FILE"
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dd bs="$BS" of="$OUTPUT_FILE" if="$RECOVERY_FILE" seek="$RECOVERY_OFFSET"
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dd bs="$BS" of="$OUTPUT_FILE" if="$ROOTFS_FILE" seek="$ROOTFS_OFFSET"
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dd if=/dev/zero of="$OUTPUT_FILE" bs=128k count=1 oflag=append conv=notrunc
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