User:Librecat/Redmi Note 12 Pro 4G(sweet k6a)

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Introduction

this phone has 4 variants :2 touch and 2 panel variants

goodix touch vs ? touch and 2 panel variants

Preparing the root file system

i recommend starting from arm64 desktop stage3 of your desired init system. Use qemu chroot to prepare your root file system on a workstation as compiling on your phone can introduce wear on the battery and internal flash(find a reputable source to cite this) lots of mobile related packages are missing from the gentoo tree(make a list and provide an overlay for initial ebuilds)

Setting up the Stage3 and QEMU Chroot

TODO

making a folder for the chroot to live in

TODO

choosing a arm64 stage3

TODO

unpacking the stage3

TODO

entering the chroot environment with instructions from the embedded handbook

TODO

first sync and update

TODO

Configuring the system and installing desired packages

System Configuration

TODO

CFLAGS

Source: https://en.wikipedia.org/wiki/List_of_Qualcomm_Snapdragon_systems_on_chips

https://en.wikipedia.org/wiki/ARM_Cortex-A76

https://en.wikipedia.org/wiki/ARM_Cortex-A55 

COMMON_FLAGS="-O2 -pipe -march=armv8.2-a+crypto+rcpc+dotprod -mtune=cortex-a76.cortex-a55"


cortex-a76.cortex-a55 is a supported mtune in gcc to tune the performance for a big.little system

VIDEO_CARDS

This smartphone has an adreno gpu so freedreno should do the trick 

VIDEO_CARDS="freedreno"

INPUT_DEVICES

TODO

Packages of Intrest

TODO

enabling the modem

TODO

installing a desktop environment

TODO

package todo

Phosh - in guru

Kde Plasma Mobile - in some random overlay

SXMO - in progress in my overlay

Qualcomm modem packages - ?????


Compiling the kernel

clone the sm7150-mainline kernel

get defconfig from postmarketOS port from Vilez

edit dts for different panel

if you dont have goodix touchscreen there is no driver yet

Alternative: repack postmarketOS kernel:

First unpack the kernel image generated by postmarketOS

clone mkbootimg 

git clone https://github.com/osm0sis/mkbootimg

compile the unpackbootimg and mkbootimg programs 

make

unpack the boot image 

mkdir sweet_k6a-mainline
./unpackbootimg -i /path/to/boot/image/boot.img -o sweet_k6a-mainline

repack the boot image 

cd sweet_k6a-mainline
../mkbootimg --base "$(cat boot-mainline.img-base)" --board "$(cat boot-mainline.img-board)" --cmdline "root=/dev/sda25 loglevel=5" --hashtype "$(cat boot-mainline.img-hashtype)" --header_version "$(cat boot-mainline.img-header_version)" --kernel boot-mainline.img-kernel --kernel_offset "$(cat boot-mainline.img-kernel_offset)" --pagesize "$(cat boot-mainline.img-pagesize)" --ramdisk ../initramfs-6.10.3-sm7150.img --ramdisk_offset "$(cat boot-mainline.img-ramdisk_offset)" --second_offset "$(cat boot-mainline.img-second_offset)" --tags_offset "$(cat boot-mainline.img-tags_offset)" -o gentoo-sweet_k6a-bootimg.img

Installing the root file system and kernel

in orangefox recovery:

backup super boot and dtbo partitions you will need them to restore android

enter adb shell

adb shell

format the super partition to use as the root partition for gentoo 

busybox mkfs.ext2 /dev/block/sda25

exit adb shell to push the rootfs 

adb push gentoo-rootfs.tar /sdcard/

enter adb shell again to unpack the rootfs 

adb shell

mount /dev/block/sda25 /mnt

cd /mnt

tar -xvpf /sdcard/gentoo-rootfs.tar

now you can configure the system but keep in mind that internet connection is not usable in recovery

flashing the kernel:

reboot into bootloader mode

once the phone says fastboot on the screen(instructions from https://wiki.postmarketos.org/wiki/Xiaomi_Redmi_Note_10_Pro_(xiaomi-sweet) and https://wiki.postmarketos.org/wiki/Xiaomi_Redmi_Note_12_Pro_(4G)_(xiaomi-sweet_k6a) ) 

fastboot erase dtbo

fastboot flash boot gentoo-sweet_k6a-bootimg.img

now you can reboot your phone to test

Entering chroot from recovery to change configuration 

mount /dev/sda25 /mnt

cd /mnt

mount --rbind /dev ./dev

mount --rbind /sys ./sys

mount --rbind /proc ./proc


chroot . /bin/bash --login

now do whatever you want just dont forget to sync before rebooting the phone

Preparing a binhost on your workstation to compile updates

TODO

Kernel updates

TODO

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