50 lines
1.3 KiB
Bash
50 lines
1.3 KiB
Bash
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#!/bin/bash
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# 检查是否传入目标文件路径
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if [ -z "$1" ]; then
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echo "Usage: $0 <output_path>"
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exit 1
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fi
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# 设置变量
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OUTPUT_PATH="$1"
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IMAGE_SIZE=4096 # 指定大小（字节），例如4096字节
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CONTENT="" # 要写入的内容，可以修改为"boot-recovery"或空
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# 确保目标目录存在，如果不存在则创建
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OUTPUT_DIR=$(dirname "$OUTPUT_PATH")
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if [ ! -d "$OUTPUT_DIR" ]; then
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mkdir -p "$OUTPUT_DIR"
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fi
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# 创建指定大小的空文件
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dd if=/dev/zero of="$OUTPUT_PATH" bs=1 count=0 seek="$IMAGE_SIZE"
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# 如果内容不为空，写入内容
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if [ -n "$CONTENT" ]; then
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echo -n "$CONTENT" | dd of="$OUTPUT_PATH" bs=1 conv=notrunc
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fi
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echo "Created $OUTPUT_PATH with size $IMAGE_SIZE bytes and content: '$CONTENT'"
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# 设置结构体字段初始值
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{
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# command[32]全0（默认）
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# status[32]全0（默认）
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# tries_remaining[0]=3, tries_remaining[1]=0 (小端模式)
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printf '\x03\x00' | dd of="$OUTPUT_PATH" bs=1 seek=64 conv=notrunc
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# successful_boot[2]全0（默认）
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# 写入stage字段（偏移量68+764=832）
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# stage[32]全0（默认）
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# 写入reserved字段（偏移量832+32=864）
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# reserved[1184]全0（默认）
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} 2>/dev/null
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echo "Created $OUTPUT_PATH with bootloader_message structure initialized"
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