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46 lines
1.7 KiB
Bash
46 lines
1.7 KiB
Bash
REQUIRE_IMAGE_METADATA=1
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platform_do_upgrade() {
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local board=$(board_name)
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case "$board" in
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huawei,ec6108v9c)
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echo "Upgrading kernel partition..."
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get_image "$1" | dd bs=1M count=16 of=/dev/mmcblk0p3 || {
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echo "Kernel upgrade failed!"
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return 1
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}
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echo "Upgrading rootfs partition..."
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get_image "$1" | dd bs=1M skip=16 of=/dev/mmcblk0p4 || {
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echo "Rootfs upgrade failed!"
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return 1
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}
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sync
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echo "Upgrade completed successfully!"
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;;
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*)
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default_do_upgrade "$1"
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;;
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esac
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}
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```
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### 工作原理
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```
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sysupgrade.bin 结构：
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┌────────────────┬──────────────┬──────────┐
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│ kernel (16MB) │ rootfs │ metadata │
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└────────────────┴──────────────┴──────────┘
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写入到 /dev/mmcblk0p3 时：
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┌───────── 从这里开始写入
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↓
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┌──────────┬──────────┬────────────┬──────────────┐
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│ fastboot │ bootargs │ kernel │ rootfs │
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│ 1MB │ 1MB │ 16MB │ 512MB │
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│ 0-1MB │ 1-2MB │ 2MB-18MB │ 18MB-530MB │
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└──────────┴──────────┴────────────┴──────────────┘
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│←── 16MB ──→│←─ rootfs ──→│
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写入覆盖这两个分区 |