Hi I'm Xiaomi Mi 9T/ Redmi K20 (davinci)

Android.mk

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+LOCAL_PATH := $(call my-dir)
+
+ifeq ($(TARGET_DEVICE),davinci)
+include $(call all-subdir-makefiles,$(LOCAL_PATH))
+endif

AndroidBoard.mk

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+#
+# Copyright (C) 2019 The TwrpBuilder Open-Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+LOCAL_PATH := $(call my-dir)
+
+ifneq ($(filter davinci,$(TARGET_DEVICE)),)
+include $(call all-makefiles-under,$(LOCAL_PATH))
+endif

AndroidProducts.mk

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+#
+# Copyright (C) 2019 The TwrpBuilder Open-Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+PRODUCT_MAKEFILES := \
+    $(LOCAL_DIR)/omni_davinci.mk

BoardConfig.mk

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+#
+# Copyright (C) 2019 The TwrpBuilder Open-Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+DEVICE_PATH := device/xiaomi/davinci
+
+# Architecture
+TARGET_ARCH := arm64
+TARGET_ARCH_VARIANT := armv8-a
+TARGET_CPU_ABI := arm64-v8a
+TARGET_CPU_ABI2 :=
+TARGET_CPU_VARIANT := kryo
+
+TARGET_2ND_ARCH := arm
+TARGET_2ND_ARCH_VARIANT := armv8-a
+TARGET_2ND_CPU_ABI := armeabi-v7a
+TARGET_2ND_CPU_ABI2 := armeabi
+TARGET_2ND_CPU_VARIANT := cortex-a73
+TARGET_USES_64_BIT_BINDER := true
+
+ENABLE_CPUSETS := true
+ENABLE_SCHEDBOOST := true
+
+# Bootloader
+TARGET_BOOTLOADER_BOARD_NAME := sm6150
+TARGET_NO_BOOTLOADER := true
+TARGET_USES_UEFI := true
+
+# Platform
+TARGET_BOARD_PLATFORM := sm6150
+TARGET_BOARD_PLATFORM_GPU := qcom-adreno618
+
+# Kernel
+BOARD_KERNEL_CMDLINE := console=ttyMSM0,115200n8 androidboot.hardware=qcom androidboot.console=ttyMSM0 androidboot.memcg=1 lpm_levels.sleep_disabled=1 video=vfb:640x400,bpp=32,memsize=3072000 msm_rtb.filter=0x237 service_locator.enable=1 swiotlb=1 androidboot.usbcontroller=a600000.dwc3 firmware_class.path=/vendor/firmware_mnt/image earlycon=msm_geni_serial,0x880000 loop.max_part=7 cgroup.memory=nokmem,nosocket androidboot.selinux=permissive androidboot.vbmeta.avb_version=1.0
+BOARD_KERNEL_BASE := 0x00000000
+BOARD_KERNEL_PAGESIZE := 4096
+BOARD_KERNEL_TAGS_OFFSET := 0x00000100
+BOARD_RAMDISK_OFFSET     := 0x01000000
+BOARD_KERNEL_IMAGE_NAME := Image.gz-dtb
+TARGET_KERNEL_ARCH := arm64
+TARGET_KERNEL_HEADER_ARCH := arm64
+TARGET_PREBUILT_KERNEL := $(DEVICE_PATH)/prebuilt/Image.gz-dtb
+BOARD_PREBUILT_DTBOIMAGE := $(DEVICE_PATH)/prebuilt/dtbo.img
+BOARD_INCLUDE_RECOVERY_DTBO := true
+BOARD_BOOTIMG_HEADER_VERSION := 1
+BOARD_MKBOOTIMG_ARGS := --ramdisk_offset $(BOARD_RAMDISK_OFFSET)
+BOARD_MKBOOTIMG_ARGS += --tags_offset $(BOARD_KERNEL_TAGS_OFFSET)
+BOARD_MKBOOTIMG_ARGS += --header_version $(BOARD_BOOTIMG_HEADER_VERSION)
+
+# QCOM
+#TARGET_USE_SDCLANG := true
+
+# Assert
+TARGET_OTA_ASSERT_DEVICE := davinci
+
+# Avb
+BOARD_AVB_ENABLE := true
+BOARD_AVB_ROLLBACK_INDEX := $(PLATFORM_SECURITY_PATCH_TIMESTAMP)
+
+# Partitions
+BOARD_FLASH_BLOCK_SIZE := 262144
+BOARD_BOOTIMAGE_PARTITION_SIZE := 134217728
+BOARD_RECOVERYIMAGE_PARTITION_SIZE := 67108864
+BOARD_SYSTEMIMAGE_PARTITION_SIZE := 3106136440
+BOARD_SYSTEMIMAGE_PARTITION_TYPE := ext4
+BOARD_USERDATAIMAGE_PARTITION_SIZE := 12884901888
+BOARD_USERDATAIMAGE_FILE_SYSTEM_TYPE := ext4
+BOARD_VENDORIMAGE_PARTITION_SIZE := 1375437080
+BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE := ext4
+
+# System as root
+BOARD_BUILD_SYSTEM_ROOT_IMAGE := true
+BOARD_ROOT_EXTRA_FOLDERS := bluetooth dsp firmware persist
+BOARD_SUPPRESS_SECURE_ERASE := true
+
+# File systems
+TARGET_USERIMAGES_USE_EXT4 := true
+TARGET_USERIMAGES_USE_F2FS := true
+
+# Workaround for error copying vendor files to recovery ramdisk
+BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE := ext4
+TARGET_COPY_OUT_VENDOR := vendor
+
+# Recovery
+BOARD_HAS_LARGE_FILESYSTEM := true
+TARGET_RECOVERY_PIXEL_FORMAT := "BGRA_8888"
+
+# Crypto
+TW_INCLUDE_CRYPTO := true
+TW_INCLUDE_FBE := true
+
+# TWRP specific build flags
+TW_THEME := portrait_hdpi
+RECOVERY_SDCARD_ON_DATA := true
+TARGET_RECOVERY_QCOM_RTC_FIX := true
+TW_EXCLUDE_DEFAULT_USB_INIT := true
+TW_EXTRA_LANGUAGES := true
+TW_INCLUDE_NTFS_3G := true
+TW_USE_TOOLBOX := true
+TW_INPUT_BLACKLIST := "hbtp_vm"
+TW_BRIGHTNESS_PATH := "/sys/class/backlight/panel0-backlight/brightness"
+TW_MAX_BRIGHTNESS := 2047
+TW_DEFAULT_BRIGHTNESS := 1200
+#TW_SCREEN_BLANK_ON_BOOT := true
+TWRP_INCLUDE_LOGCAT := true
+TARGET_USES_LOGD := true
+TARGET_USES_MKE2FS := true
+TW_EXCLUDE_TWRPAPP := true
+
+# Hack: prevent anti rollback
+PLATFORM_SECURITY_PATCH := 2099-12-31
+

README.md

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+# android_device_xiaomi_davinci
+For building TWRP for Xiaomi Redmi K20
+
+TWRP device tree for Xiaomi Redmi K20
+
+## Features
+
+Works:
+
+- ADB
+- Decryption of /data
+- Screen brightness settings
+- Correct screenshot color
+- MTP
+- Flashing (opengapps, roms, images and so on)
+- Backup/Restore (Needs more testing)
+- USB OTG
+- Android Q Support
+
+TO-DO:
+
+- Vibration support
+
+## Compile
+
+First checkout minimal twrp with omnirom tree:
+
+```
+repo init -u git://github.com/minimal-manifest-twrp/platform_manifest_twrp_omni.git -b twrp-9.0
+repo sync
+```
+
+Then add these projects to .repo/manifest.xml:
+
+```xml
+<project path="device/xiaomi/davinci" name="mauronofrio/android_device_xiaomi_davinci" remote="github" revision="android-9.0" />
+```
+
+Finally execute these:
+
+```
+. build/envsetup.sh
+lunch omni_davinci-eng
+mka recoveryimage ALLOW_MISSING_DEPENDENCIES=true # Only if you use minimal twrp tree.
+```
+
+To test it:
+
+```
+fastboot boot out/target/product/davinci/recovery.img
+```
+
+## Other Sources
+
+Precompiled Stock Kernel
+
+## Thanks
+

omni_davinci.mk

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+#
+# Copyright (C) 2019 The TwrpBuilder Open-Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Release name
+PRODUCT_RELEASE_NAME := davinci
+
+$(call inherit-product, build/target/product/embedded.mk)
+
+# Inherit from our custom product configuration
+$(call inherit-product, vendor/omni/config/common.mk)
+
+## Device identifier. This must come after all inclusions
+PRODUCT_DEVICE := davinci
+PRODUCT_NAME := omni_davinci
+PRODUCT_BRAND := Xiaomi
+PRODUCT_MODEL := Xiaomi Redmi K20
+PRODUCT_MANUFACTURER := Xiaomi
+
+# HACK: Set vendor patch level
+PRODUCT_PROPERTY_OVERRIDES += \
+    ro.vendor.build.security_patch=2099-12-31
+

recovery.fstab

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+# Android fstab file.
+# The filesystem that contains the filesystem checker binary (typically /system) cannot
+# specify MF_CHECK, and must come before any filesystems that do specify MF_CHECK
+
+# mount point  fstype device                             device2              flags
+/boot          emmc    /dev/block/bootdevice/by-name/boot
+/dtbo          emmc   /dev/block/bootdevice/by-name/dtbo                         flags=backup=1;display="Dtbo";flashimg=1
+/cache         ext4    /dev/block/bootdevice/by-name/cache
+/recovery      emmc    /dev/block/bootdevice/by-name/recovery                    flags=backup=1
+/system_root   ext4    /dev/block/bootdevice/by-name/system                      flags=display="System";backup=0
+/vendor        ext4    /dev/block/bootdevice/by-name/vendor                      flags=display="Vendor";backup=0;wipeingui
+
+/system_image  emmc    /dev/block/bootdevice/by-name/system
+/vendor_image  emmc    /dev/block/bootdevice/by-name/vendor
+
+/data          ext4   /dev/block/bootdevice/by-name/userdata                     flags=fileencryption=ice:aes-256-cts;wrappedkey
+/firmware      vfat   /dev/block/bootdevice/by-name/modem                        flags=display="Firmware";mounttodecrypt
+/cust          ext4   /dev/block/bootdevice/by-name/cust                         flags=display="Cust"
+/misc          emmc   /dev/block/bootdevice/by-name/misc
+/modem         emmc   /dev/block/bootdevice/by-name/modem                        flags=backup=1;display="Modem"
+/bluetooth     emmc   /dev/block/bootdevice/by-name/bluetooth                    flags=backup=1;subpartitionof=/modem
+/dsp           emmc   /dev/block/bootdevice/by-name/dsp                          flags=backup=1;subpartitionof=/modem
+/efs1          emmc   /dev/block/bootdevice/by-name/modemst1                     flags=backup=1;display=EFS
+/efs2          emmc   /dev/block/bootdevice/by-name/modemst2                     flags=backup=1;subpartitionof=/efs1
+/efsc          emmc   /dev/block/bootdevice/by-name/fsc                          flags=backup=1;subpartitionof=/efs1
+/efsg          emmc   /dev/block/bootdevice/by-name/fsg                          flags=backup=1;subpartitionof=/efs1
+/persist       ext4   /dev/block/bootdevice/by-name/persist                      flags=display="Persist"
+
+# Removable storage
+/usb_otg       vfat   /dev/block/sdg1                    /dev/block/sdg          flags=fsflags=utf8;display="USB-OTG";storage;wipeingui;removable