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MSM8916 研究记录

  • 2023年 10月21日

[TOC]

MSM8916 研究记录

lk1nd/lk2nd

  • lk2nd: “secondary” bootloader intended for devices where existing firmware cannot be replaced easily (most smartphones and tablets). In this configuration, lk2nd does not replace the stock bootloader. Instead, it is packed into an Android boot image, which is then loaded by the stock bootloader just like the original Android image. The real operating system can be placed in the boot partition with 512 KiB offset or stored in a ext2 file system. It does not have to be Android or even Linux, any kind of kernel can be packed into an Android boot image.

  • lk1st: primary bootloader intended for single-board computers (SBCs) and expert users. In this case, it is the “first” bootloader responsible for loading the main operating system.

所以 lk1nd 为 1 级引导，用于启动整个操作系统。而 lk2nd 不是必须的，lk2nd 提供给我们一个比较友好的 fastboot interface 来维护 emmc 内的各个分区。

UFI003 OpenWRT Build Notes

Build Environment:

ihexon@ihexon-desktop /m/s/immortalwrt (master)> uname -a
Linux ihexon-desktop 5.10.160-rockchip #20 SMP Sun Nov 12 16:13:15 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux


ihexon@ihexon-desktop /m/s/immortalwrt (master)> gcc -v;
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/aarch64-linux-gnu/11/lto-wrapper
Target: aarch64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.4.0-1ubuntu1~22.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-11 --program-prefix=aarch64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --enable-fix-cortex-a53-843419 --disable-werror --enable-checking=release --build=aarch64-linux-gnu --host=aarch64-linux-gnu --target=aarch64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd

Git repo:

ihexon@ihexon-desktop /m/s/immortalwrt (master)> git remote -v
origin  https://github.com/lkiuyu/immortalwrt (fetch)
origin  https://github.com/lkiuyu/immortalwrt (push)

Thanks to lkiuyu/immortalwrt, all UFI’s Kernel/Packages/Firmeware integral to this branch so we can easily build our own Image for UFI stick :)

$ ./scripts/feeds update -a
$ ./scripts/feeds install -a -f

Before build Openwrt, Install required package and make sure u have stable network connectivity :

> sudo apt install u-boot-tools simg2img perl
> set -x http_proxy  http://IP:PORT # set http(s)_proxy
> set -x https_proxy http://IP:PORT

Make .config

You need at least 50GB size of disk

> make defconfig
> make menuconfig

重要的配置会一一列举，其余的附加功能可以自己定制：

  • Select Target system,

For now I have Zhihe OpenStick UFI003, so select right profile to start build:

Adjust the Target Images:

We dont need squashfs cause we want the root can be modifies in the future. Make sure the image is big enough to store the rootfs, recommend 1024M or bigger.

Most important, create an ext4 filesystem with a journal:

LUCI Configure

Defiantly we need luci interface, so select luci packages. I use nginx with ssl as server luci web interface:

UFI have modem so luci need modemmanager.

LuCI → 5. Protocols ──>

Docker

Filesystem

USB NET

Errors

go-bootstrap can not installed on arm64 system

In x86 system without any problem, but arm64 environment has this issue, simple to solve: edit .config, set CONFIG_GOLANG_EXTERNAL_BOOTSTRAP_ROOT to your go installed path:

CONFIG_GOLANG_EXTERNAL_BOOTSTRAP_ROOT="/home/ihexon/go/"

Now run make again !

打开 usb adb 调试，并关闭其他 usb 功能，如果同时开启 adbd 和 rndis 会导致 adb 无法发现 UFI1003 设备，因为 Windows 似乎不支持 USB 多设备。

ihexon@raspberrypi /t/rootfs> cat etc/config/gc
config gc 'config'
        option enabled '1'
        option adb '1'
        option rndis '0'
        option mass '0'
        option mass_path '/'
        option serial '0'
        option hid '0'
        option ecm '0'
        option acm '0'
        option printer '0'
        option midi '0'

Debug

make -j23 V=sc  2>&1 |tee build.log | grep -i -E "^make.*(error|[12345]...Entering dir)"

所有的日志将被写入 build.log 中，以便定位错误。

Refer

  • https://wiki.postmarketos.org/wiki/Lk2nd/lk1st
  • https://openwrt.org/docs/guide-developer/start
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