本文详细指导如何在Android P版本的MTK设备上启用AB分区，包括修改preloader、lk、project和Kernel配置，创建并配置partition_ab_dynamic.xml，更新te文件，scatter.json和file_contexts，以及解决常见升级问题。附带OTADemo链接。
MTK AB分区修改
打开OTA设置
android p版本开AB 分区需要修改以下配置项：
(1)preloader:
vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/projectname/projectname.mk
MTK_AB_OTA_UPDATER=yes
export MTK_AB_OTA_UPDATER
(2)lk:
vendor/mediatek/proprietary/bootable/bootloader/lk/project/projectname.mk
MTK_AB_OTA_UPDATER=yes
SYSTEM_AS_ROOT=yes
(3)project:
device/mediatekprojects/projectname/ProjectConfig.mk
MTK_AB_OTA_UPDATER=yes
SYSTEM_AS_ROOT=yes
(4)Kernel:
kernel-XXX/arch/arm64/projectname_defconfig
kernel-XXX/arch/arm64/projectname_debug_defconfig
如果有 # CONFIG_SYSTEM_AS_ROOT
is not set, 删去此行
SYSTEM_AS_ROOT定义的Kconfig在kernel-XXX/drivers/misc/mdiatek/Kconfig中，默认为y
确认kernel-XXX的方式为：
查看 /device/mediatekprojects/ projectname /ProjectConfig.mk
LINUX_KERNEL_VERSION = kernel-XXX
(5)增加分区文件device/project/xxxx/partition/partition_ab_dynamic.xml
同时修改编译脚本
device/project/xxxx/partition/Android.mk
(6)增加ota update_engine的SE权限
device/mediatek/mt8xxx/sepolicy/basic/update_engine.te
(7)修改生成的分区刷机文件
device/project/xxxx/partition/scatter.json
(8)AB分区的块设备权限
device/mediatek/mt8xxx/sepolicy/basic/file_contexts
(9)OTA升级遇到的bug解决
(10) OTADemo
前面4步都是添加设置，比较简单，我们从第5步开始说明
5.本来说是在xls里面配置的
device\mediatek\build\build\tools\ptgen\MT8xxx\partition_table_MT8xxx.xls这里是没有动态分区的
但是根据MTK的脚本，发现在device\mediatek\project\xxxx\partition\partition_dynamic.xml里面
新建一个partition_ab_dynamic.xml文件，如下配置，
31457280*512\1024\1024=15360M 也就是15G，下面的也是这么算的
这个不知道怎么写， 就参考其他项目的，或者看这个partition_table_MT8xxx.xls里面的
<?xml version="1.0" encoding="utf-8"?>
<partition lba="31457280">
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="6144" name="proinfo"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="30720" name="cam_vpu1_a"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="30720" name="cam_vpu2_a"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="30720" name="cam_vpu3_a"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="30720" name="cam_vpu1_b"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="30720" name="cam_vpu2_b"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="30720" name="cam_vpu3_b"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="10240" name="nvram"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="20480" name="protect1"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="20480" name="protect2"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="98304" name="persist"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="16384" name="nvcfg"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="512" name="seccfg"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="2048" name="lk_a"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="2048" name="lk_b"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="65536" name="boot_a"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="65536" name="boot_b"/>
<!-- <entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="65536" name="recovery"/> -->
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="1024" name="para"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="16384" name="logo"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="16384" name="dtbo_a"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="16384" name="dtbo_b"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="20480" name="expdb"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="2048" name="frp"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="10240" name="tee_a"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="10240" name="tee_b"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="4096" name="kb"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="4096" name="dkb"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="65536" name="metadata"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="11520" name="vbmeta_a"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="11520" name="vbmeta_b"/>
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="8192" name="nvdata" />
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="4096" name="vbmeta_system_a" />
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="4096" name="vbmeta_system_b" />
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="4096" name="vbmeta_vendor_a" />
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="4096" name="vbmeta_vendor_b" />
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="16769024" name="super"/>
<!-- <entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="229376" name="cache"/> -->
<entry type="{0FC63DAF-8483-4772-8E79-3D69D8477DE4}" size="6291456" name="userdata"/>
</partition>
同目录下的mk脚本 ，这里修改
#PARTITION := $(LOCAL_PATH)/partition_dynamic.xml
PARTITION := $(LOCAL_PATH)/partition_ab_dynamic.xml
还有一些其他地方有需要修改的
diff --git a/alps/device/mediatek/mt8168/BoardConfig.mk b/alps/device/mediatek/mt8xxx/BoardConfig.mk
--- a/alps/device/mediatek/mt8168/BoardConfig.mk
+++ b/alps/device/mediatek/mt8168/BoardConfig.mk
@@ -163,7 +163,8 @@ endif
#get partition
ifeq ($(strip $(MTK_DYNAMIC_PARTITION_SUPPORT)), yes)
-PARTITION_XML := $(MTK_TARGET_PROJECT_FOLDER)/partition/partition_dynamic.xml
+#PARTITION_XML := $(MTK_TARGET_PROJECT_FOLDER)/partition/partition_dynamic.xml
+PARTITION_XML := $(MTK_TARGET_PROJECT_FOLDER)/partition/partition_ab_dynamic.xml
6增加te文件
diff --git a/alps/device/mediatek/mt8xxx/sepolicy/basic/update_engine.te b/alps/device/mediatek/mt8xxx/sepolicy/basic/update_engine.te
--- /dev/null
+++ b/alps/device/mediatek/mt8168/sepolicy/basic/update_engine.te
@@ -0,0 +1,2 @@
+allow update_engine metadata_file:dir { search };^M
+allow update_engine sysfs_boot_type:file { read open getattr write unlink};
(7)修改生成的分区刷机文件
device/project/xxxx/partition/scatter.json
{
"preloader": {
"boundary_check": true,
"is_download": true,
"is_upgradable": true,
"file_name": "preloader_xxxx.bin",
"is_reserved": false,
"partition_name": "preloader",
"partition_size": 262144,
"physical_start_addr": 0,
"linear_start_addr": 0,
"region": "EMMC_BOOT_1",
"storage": "HW_STORAGE_EMMC",
"operation_type": "BOOTLOADERS",
"type": "SV5_BL_BIN",
"reserve": 0
},
"pgpt": {
"boundary_check": true,
"is_download": true,
"file_name": "GPT.img",
"is_reserved": false,
"partition_name": "pgpt",
"partition_size": 524288,
"physical_start_addr": 0,
"linear_start_addr": 0,
"region": "EMMC_USER",
"storage": "HW_STORAGE_EMMC",
"operation_type": "UPDATE",
"type": "NORMAL_ROM",
"reserve": 0
},
"PRO_INFO": {
"operation_type": "PROTECTED",
"type": "NORMAL_ROM"
},
"proinfo": {
"operation_type": "PROTECTED",
"type": "NORMAL_ROM"
},
"NVRAM": {
"operation_type": "BINREGION",
"type": "NORMAL_ROM"
},
"nvram": {
"operation_type": "BINREGION",
"type": "NORMAL_ROM"
},
"cam_vpu1": {
"file_name": "cam_vpu1.img",
"operation_type": "UPDATE",
"is_upgradable": true,
"type": "NORMAL_ROM"
},
"cam_vpu1_a": {
"file_name": "cam_vpu1.img",
"operation_type": "UPDATE",
"is_upgradable": true,
"type": "NORMAL_ROM"
},
"cam_vpu1_b": {
"is_upgradable": true,
"type": "NORMAL_ROM"
},
"cam_vpu2": {
"file_name": "cam_vpu2.img",
"operation_type": "UPDATE",
"is_upgradable": true,
"type": "NORMAL_ROM"
},
"cam_vpu2_a": {
"file_name": "cam_vpu2.img",
"operation_type": "UPDATE",
"is_upgradable": true,
"type": "NORMAL_ROM"
},
"cam_vpu2_b": {
"is_upgradable": true,
"type": "NORMAL_ROM"
},
"cam_vpu3": {
"file_name": "cam_vpu3.img",
"operation_type": "UPDATE",
"is_upgradable": true,
"type": "NORMAL_ROM"
},
"cam_vpu3_a": {
"file_name": "cam_vpu3.img",
"operation_type": "UPDATE",
"is_upgradable": true,
"type": "NORMAL_ROM"
},
"cam_vpu3_b": {
"is_upgradable": true,
"type": "NORMAL_ROM"
},
"nvcfg": {
"operation_type": "INVISIBLE",
"type": "EXT4_IMG"
},
"boot_para": {
"operation_type": "INVISIBLE",
"type": "NORMAL_ROM"
},
"protect1": {
"operation_type": "PROTECTED",
"type": "EXT4_IMG"
},
"protect2": {
"operation_type": "PROTECTED",
"type": "EXT4_IMG"
},
"para": {
"operation_type": "INVISIBLE",
"type": "NORMAL_ROM"
},
"SECCFG": {
"operation_type": "INVISIBLE",
"type": "NONE"
},
"seccfg": {
"operation_type": "INVISIBLE",
"type": "NORMAL_ROM"
},
"PROTECT_F": {
"operation_type": "PROTECTED",
"type": "NORMAL_ROM"
},
"PROTECT_S": {
"operation_type": "PROTECTED",
"type": "NORMAL_ROM"
},
"UBOOT": {
"file_name": "lk.img",
"type": "NORMAL_ROM"
},
"lk": {
"file_name": "lk.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"lk2": {
"file_name": "lk.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"lk_a": {
"file_name": "lk.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"lk_b": {
"type": "NORMAL_ROM",
"is_upgradable": true
},
"BOOTIMG": {
"file_name": "boot.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"boot": {
"file_name": "boot.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"boot_a": {
"file_name": "boot.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"boot_b": {
"type": "NORMAL_ROM",
"is_upgradable": true
},
"recovery": {
"file_name": "recovery.img",
"is_upgradable": true
},
"RECOVERY": {
"file_name": "recovery.img",
"is_upgradable": true
},
"SEC_RO": {
"file_name": "secro.img",
"type": "NORMAL_ROM"
},
"secro": {
"file_name": "secro.img",
"type": "NORMAL_ROM"
},
"MISC": {
"operation_type": "INVISIBLE",
"type": "NONE"
},
"misc": {
"operation_type": "INVISIBLE",
"type": "NONE"
},
"LOGO": {
"file_name": "logo.bin",
"type": "NORMAL_ROM"
},
"logo": {
"file_name": "logo.bin",
"type": "NORMAL_ROM"
},
"DTBO": {
"file_name": "dtbo.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"dtbo": {
"file_name": "dtbo.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"dtbo_a": {
"file_name": "dtbo.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"dtbo_b": {
"type": "NORMAL_ROM",
"is_upgradable": true
},
"ODMDTBO": {
"file_name": "odmdtbo.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"odmdtbo": {
"file_name": "odmdtbo.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"odmdtbo_a": {
"file_name": "odmdtbo.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"odmdtbo_b": {
"file_name": "odmdtbo.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"EXPDB": {
"operation_type": "INVISIBLE",
"type": "NORMAL_ROM"
},
"expdb": {
"operation_type": "INVISIBLE",
"type": "NORMAL_ROM"
},
"TEE1": {
"file_name": "tee.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"TEE2": {
"file_name": "tee.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"tee1": {
"file_name": "tee.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"tee2": {
"file_name": "tee.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"tee_a": {
"file_name": "tee.img",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"tee_b": {
"type": "NORMAL_ROM",
"is_upgradable": true
},
"oemkeystore": {
"operation_type": "INVISIBLE",
"type": "NORMAL_ROM"
},
"keystore": {
"operation_type": "INVISIBLE",
"type": "NORMAL_ROM"
},
"FRP": {
"operation_type": "INVISIBLE",
"type": "NORMAL_ROM"
},
"frp": {
"operation_type": "INVISIBLE",
"type": "NORMAL_ROM"
},
"nvdata": {
"operation_type": "INVISIBLE",
"type": "EXT4_IMG"
},
"metadata": {
"operation_type": "INVISIBLE",
"type": "NORMAL_ROM"
},
"vbmeta": {
"file_name": "vbmeta.img",
"operation_type": "UPDATE",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"vbmeta_a": {
"file_name": "vbmeta.img",
"operation_type": "UPDATE",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"vbmeta_b": {
"type": "NORMAL_ROM",
"is_upgradable": true
},
"KB": {
"operation_type": "INVISIBLE",
"type": "NORMAL_ROM"
},
"kb": {
"operation_type": "PROTECTED",
"type": "NORMAL_ROM"
},
"dkb": {
"operation_type": "PROTECTED",
"type": "NORMAL_ROM"
},
"vbmeta_vendor": {
"file_name": "vbmeta_vendor.img",
"operation_type": "UPDATE",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"vbmeta_vendor_a": {
"file_name": "vbmeta_vendor.img",
"operation_type": "UPDATE",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"vbmeta_vendor_b": {
"type": "NORMAL_ROM",
"is_upgradable": true
},
"vbmeta_system": {
"file_name": "vbmeta_system.img",
"operation_type": "UPDATE",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"vbmeta_system_a": {
"file_name": "vbmeta_system.img",
"operation_type": "UPDATE",
"type": "NORMAL_ROM",
"is_upgradable": true
},
"vbmeta_system_b": {
"type": "NORMAL_ROM",
"is_upgradable": true
},
"system": {
"file_name": "system.img",
"type": "EXT4_IMG",
"is_upgradable": true
},
"super": {
"file_name": "super.img",
"type": "EXT4_IMG",
"is_upgradable": true
},
"system_a": {
"file_name": "system.img",
"type": "EXT4_IMG",
"is_upgradable": true
},
"system_b": {
"file_name": "system_other.img",
"type": "EXT4_IMG",
"is_upgradable": true
},
"ANDROID": {
"file_name": "system.img",
"type": "EXT4_IMG",
"is_upgradable": true
},
"vendor": {
"file_name": "vendor.img",
"type": "EXT4_IMG",
"is_upgradable": true
},
"VENDOR": {
"file_name": "vendor.img",
"type": "EXT4_IMG",
"is_upgradable": true
},
"vendor_a": {
"file_name": "vendor.img",
"type": "EXT4_IMG",
"is_upgradable": true
},
"vendor_b": {
"type": "EXT4_IMG",
"is_upgradable": true
},
"odm": {
"file_name": "odm.img",
"type": "EXT4_IMG",
"is_upgradable": true
},
"ODM": {
"file_name": "odm.img",
"type": "EXT4_IMG",
"is_upgradable": true
},
"odm_a": {
"file_name": "odm.img",
"type": "EXT4_IMG",
"is_upgradable": true
},
"odm_b": {
"type": "EXT4_IMG",
"is_upgradable": true
},
"cache": {
"file_name": "cache.img",
"type": "EXT4_IMG"
},
"CACHE": {
"file_name": "cache.img",
"type": "EXT4_IMG"
},
"persist": {
"operation_type": "PROTECTED",
"type": "EXT4_IMG"
},
"userdata": {
"file_name": "userdata.img",
"type": "EXT4_IMG"
},
"USRDATA": {
"file_name": "userdata.img",
"type": "EXT4_IMG"
},
"FAT": {
"type": "EXT4_IMG",
"operation_type": "INVISIBLE"
},
"OTP": {
"boundary_check": false,
"is_download": false,
"file_name": "NONE",
"is_reserved": true,
"partition_name": "OTP",
"partition_size": 45088768,
"physical_start_addr": 4294902104,
"linear_start_addr": 4294902104,
"region": "EMMC_USER",
"storage": "HW_STORAGE_EMMC",
"operation_type": "RESERVED",
"type": "NONE",
"reserve": 0
},
"sgpt": {
"boundary_check": false,
"is_download": false,
"file_name": "NONE",
"is_reserved": true,
"partition_name": "sgpt",
"partition_size": 16896,
"physical_start_addr": 4294901760,
"linear_start_addr": 4294901760,
"region": "EMMC_USER",
"storage": "HW_STORAGE_EMMC",
"operation_type": "RESERVED",
"type": "NORMAL_ROM",
"reserve": 0
}
}
(8)AB分区的块设备权限
device/mediatek/mt8xxx/sepolicy/basic/file_contexts
diff --git a/alps/device/mediatek/mt8168/sepolicy/basic/file_contexts b/alps/device/mediatek/mt8168/sepolicy/basic/file_contexts
index d8999c3cad..79452f378e 100644
--- a/alps/device/mediatek/mt8168/sepolicy/basic/file_contexts
+++ b/alps/device/mediatek/mt8168/sepolicy/basic/file_contexts
@@ -3,6 +3,8 @@
#
/dev/block/platform/soc/[0-9]+\.mmc/by-name/proinfo u:object_r:nvram_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/nvram u:object_r:nvram_device:s0
+/dev/block/platform/soc/[0-9]+\.mmc/by-name/preloader(_[ab])? u:object_r:preloader_block_device:s0
+/dev/block/platform/soc/[0-9]+\.mmc/by-name/lk(_[ab])? u:object_r:lk_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/protect1 u:object_r:protect1_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/protect2 u:object_r:protect2_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/seccfg u:object_r:seccfg_block_device:s0
@@ -14,16 +16,25 @@
/dev/block/platform/soc/[0-9]+\.mmc/by-name/frp u:object_r:frp_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/tee1 u:object_r:tee_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/tee2 u:object_r:tee_block_device:s0
+/dev/block/platform/soc/[0-9]+\.mmc/by-name/tee(_[ab])? u:object_r:tee_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/nvdata u:object_r:nvdata_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/metadata u:object_r:metadata_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/super u:object_r:super_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/system u:object_r:system_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/vendor(_[ab])? u:object_r:vendor_block_device:s0
+/dev/block/platform/soc/[0-9]+\.mmc/by-name/vbmeta(_system|_vendor)?(_[ab])? u:object_r:vbmeta_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/cache u:object_r:cache_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/userdata u:object_r:userdata_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/odmdtbo(_[ab])? u:object_r:dtbo_block_device:s0
+/dev/block/platform/soc/[0-9]+\.mmc/by-name/dtbo(_[ab])? u:object_r:dtbo_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/odm(_[ab])? u:object_r:odm_block_device:s0
/dev/block/platform/soc/[0-9]+\.mmc/by-name/nvcfg u:object_r:nvcfg_block_device:s0
+/dev/block/platform/soc/[0-9]+\.mmc/by-name/boot(_[ab])? u:object_r:boot_block_device:s0
+
+/dev/block/platform/soc/[0-9]+\.mmc/by-name/vbmeta(_[ab])? u:object_r:lk_block_device:s0
+/dev/block/platform/soc/[0-9]+\.mmc/by-name/cam_vpu1(_[ab])? u:object_r:lk_block_device:s0
+/dev/block/platform/soc/[0-9]+\.mmc/by-name/cam_vpu2(_[ab])? u:object_r:lk_block_device:s0
+/dev/block/platform/soc/[0-9]+\.mmc/by-name/cam_vpu3(_[ab])? u:object_r:lk_block_device:s0
升级的时候可能会有bug
BUG1
校验preloader.img出错，增加下面的patch，patch_package/0001-ALPS07157008-8168-preloader-header.patch复制到下面的目录
vendor/mediatek/proprietary/bootable/bootloader/preloader/platform/mt8168/headerblock_for_ota_fastboot_emmc
这个，自己找MTK要
BUG2
Vbmeta.img校验错误 是因为在runtime是关闭了avb，加快开机速度，但这样 导致hash检验失败
1.build/make/core/Makefile
-ifeq (eng,$(filter eng, $(TARGET_BUILD_VARIANT)))
+#ifeq (eng,$(filter eng, $(TARGET_BUILD_VARIANT)))
# We only need the flag in top-level vbmeta.img.
BOARD_AVB_MAKE_VBMETA_IMAGE_ARGS += --set_hashtree_disabled_flag
-endif
+#endif
2.external/avb/avbtool
@@ -46,6 +46,7 @@ AVB_FOOTER_VERSION_MAJOR = 1
AVB_FOOTER_VERSION_MINOR = 0
AVB_VBMETA_IMAGE_FLAGS_HASHTREE_DISABLED = 1
+AVB_VBMETA_IMAGE_FLAGS_VERIFICATION_DISABLED = 2
class AvbError(Exception):
@@ -3867,7 +3868,7 @@ class AvbTool(object):
The modified arguments.
"""
if args.set_hashtree_disabled_flag:
- args.flags |= AVB_VBMETA_IMAGE_FLAGS_HASHTREE_DISABLED
+ args.flags |= AVB_VBMETA_IMAGE_FLAGS_VERIFICATION_DISABLED
return args
另附OTADemo
OTAdemo链接
https://download.youkuaiyun.com/download/xuyewen288/85801495
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