26 lines
632 B
Bash
Executable File
26 lines
632 B
Bash
Executable File
#!/bin/sh
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# Build empty image
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IMAGE="${1}"
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set -ex
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# Aim for a 4 GB card but with 5% unpartitioned as a margin
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# >>> (0.95 * 4000000000 // 512) * 512
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# 3800000000.0
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rm -f "${IMAGE}"
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fallocate -v -l 3800000000 "${IMAGE}" # 3,800,000,000 bytes
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parted -s "${IMAGE}" mklabel msdos
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parted -s "${IMAGE}" mkpart primary fat32 -- 4MiB 32MiB # 28 MiB (50,331,648 bytes)
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parted -s "${IMAGE}" mkpart primary ext2 -- 32MiB -1
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parted -s "${IMAGE}" set 2 boot on
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# Create empty FAT partition
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rm -f vfat.img
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fallocate -l 28MiB vfat.img
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mkfs.vfat vfat.img
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# Copy FAT partition to image
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dd if=vfat.img of="${IMAGE}" bs=1K seek=4K conv=notrunc
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