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# /misc partition layout
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| - | - | - | Offset | Size | description |
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| :---- | :------ | :---- | :---- | :---- | ----- |
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| Legacy | bootloader_message | | 0 | (2K) | |
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| | |command | | 32 |updated by linux/bootloader |
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| | |status | | 32 |deprecated |
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| | |recovery | |768 |talking channel between normal/recovery modes |
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| | |stage | | 32 |format "#/#", eg, "1/3" |
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| | |reserved | | 1184| |
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| - | - |- | - | - | - |
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| Vendor Area | vendor bootloader msg | N/A | 2K | 2K | Vendor Area |
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| | vendor bootloader msg | N/A | 4K | 12K | pure Vendor area |
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| - | - | - | - | - | - |
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| Wipe | wipe_package info | | 16K | 16K | offset 16KB, Used by uncrypt and recovery to store wipe_package for A/B devices |
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| - | - | - | - | - | - |
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| System | system_space -> 1<br>misc_virtual_ab_message | | | (64) | |
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| | | version | | 1 | |
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| | | magic | | 4 | |
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| | | merge_status | | 1 | |
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| | | source_slot | | 1 | |
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| | | reserved | | 57 | |
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### vendor area implementation example from Google:
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#### bootctrl.default.so (link libboot_control.a)貌似没人用
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使用legacy_boot_control.cpp, 把libboot_control.a的实现的类android::bootable::BootControl包装进去
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### android.hardware.boot@1.1-impl
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使用BootControl.cpp
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```
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android::hardware::boot::V1_1::implementation::BootControl
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```
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直接使用"android::bootable::BootControl"的实现
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#### libboot_control.a
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code location:
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```hardware/interfaces/boot/1.1/default/boot_control```
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https://android.googlesource.com/platform/hardware/interfaces/+/refs/heads/master/boot/1.1/default/boot_control/
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| - | - | - | Offset | Size | description |
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| :---- | :------ | :---- | :---- | :---- | ----- |
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| Vendor Area | bootloader_message_ab | | 2K | (2K) | Vendor Area |
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| | | slot_suffix | | 32| |
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| | | update_channel | |128 | |
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| | | reserved | | 1888| |
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### 32 BYTES "slot_suffix" part details:
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| - | - | - | Offset | Size | description |
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| :---- | :------ | :---- | :---- | :---- | ----- |
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| | bootloader_control | | | (32) | |
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| | | slot_suffix | | 4 | |
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| | | magic | | 4 | |
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| | | version | | 1 | |
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| | | nb_slot | | 3bits | number slots |
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| | | recovery_tries_remaining | | 3bits | |
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| | | merge_status | | 3bits | |
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| | | reserved0 | | 1 | |
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| | | slot_info | | 8 | slot_metadata * 4 |
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| | | reverved1 | | 8 | |
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| | | crc32_le | | 4 | |
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| | slot_metadata | | | (2) | |
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| | | priority | | 4bits | |
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| | | tries_remaining | | 3bits | |
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| | | successful_boot | | 1bit | |
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| | | verity_corrupted | | 1bit | |
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| | | reserved | | 7bits | |
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