Hobby - Brainux

• https://wiki.brainux.org/for%20beginners/beginner-get-started/

• Trying with G5200

  • Install https://www.balena.io/etcher/

  • Download sdimage from https://github.com/brain-hackers/buildbrain/releases

  • Screen Brightness issue…

    • https://askubuntu.com/questions/149054/how-to-change-lcd-brightness-from-command-line-or-via-script

    • write to brightness device.

  • Wired LAN just works with

    • RouteAr OTG USB adapter.

  • WiFi module

    • device WDC-150SU2MBK

    • tested on Windows 11

      • 

        RTL8188eu

        

        • 

    • https://knowledge.sayabo.com/2022-03-12/set-up-the-usb-wi-fi-elecom-wdc-150su2mbk-on-ubuntu-18-04-for-lan/

    • https://silverbirch.hateblo.jp/entry/2018/08/03/142252

    • https://knowledge.sayabo.com/2022-03-12/set-up-the-usb-wi-fi-elecom-wdc-150su2mbk-on-ubuntu-18-04-for-lan/

    • • Chipset

        • RTL8192CU

          • https://askubuntu.com/questions/246236/compile-and-install-rtl8192cu-driver/395826#395826

        • rtl8188eu ← maybe this is correct.

          • https://kinacon.hatenablog.com/entry/2018/08/21/145014

          • https://silverbirch.hateblo.jp/entry/2018/08/03/142252

          • Latest Linux has https://github.com/torvalds/linux/blob/abfecb39092029c42c79bacac3d1c96a133ff231/drivers/staging/r8188eu/Kconfig

          • but not in Brainux

          • so need https://github.com/lwfinger/rtl8188eu ?

    • https://linuxparadise.net/archives/6950

    • https://izumisy.work/entry/2020/08/02/194006

Building Driver

• https://github.com/lwfinger/rtl8188eu

• https://unix.stackexchange.com/questions/83319/where-are-the-current-kernel-build-options-stored

  • zcat /proc/config.gz

    • no CONFIG_WIRELESS_EXT found?

• http://nahitafu.cocolog-nifty.com/nahitafu/2019/09/post-d45021.html

• Use linux source from + rtl8288eu source

  • Also learning from http://nahitafu.cocolog-nifty.com/nahitafu/2019/09/post-d45021.html

  • with `buildbrain`

  • make ldefconfig

    • required by getcross linux

    • $ ./tools/getcross linux
      arm-linux-gnueabi-

  • make lbuild

  • $ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- KSRC=/home/sugarsun/public_git/buildbrain/linux-brain

• Ended with errors like

  • error: ‘struct iw_handler_def’ has no member named ‘private’
      .private = rtw_private_handler,
    ....

  • → https://github.com/lwfinger/rtl8188eu/issues/330

  • Ah, CONFIG_WIRELESS_EXT needs to be specified explicitly…

  • Trying enable it

    • and RTL8XXXU_UNTESTED can be interesting too?

• So need to build Brainux kernel!

  • https://wiki.brainux.org/linux/linux-build/

• https://www.spinics.net/lists/newbies/msg47812.html

  • > <M> Realtek RTL8188EU Wireless LAN NIC driver

  • might be suitable

  • so use make ARCH=arm -C linux-brain menuconfig

    • $ diff .config .config.old
      688d687
      < CONFIG_WIRELESS_EXT=y
      691d689
      < CONFIG_WEXT_PRIV=y
      701,704d698
      < CONFIG_LIB80211=m
      < CONFIG_LIB80211_CRYPT_WEP=m
      < CONFIG_LIB80211_CRYPT_CCMP=m
      < # CONFIG_LIB80211_DEBUG is not set
      3014,3015c3008
      < CONFIG_R8188EU=m
      < CONFIG_88EU_AP_MODE=y
      ---
      > # CONFIG_R8188EU is not set

• We need to be aware of

  • case "${CONFIG_CPU_ARM926T}_${CONFIG_ARCH_MULTI_V7}" in
    

    as well.

• Next error…

  •   Building modules, stage 2.
      MODPOST 1 modules
    ERROR: "register_netdevice" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "strpbrk" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "find_vpid" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "dev_get_by_name" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "down_interruptible" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "strsep" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "__pskb_pull_tail" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "strncpy" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "strncmp" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "kill_pid" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "init_net" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "unregister_netdevice_queue" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "__csum_ipv6_magic" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "up" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "csum_partial" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    ERROR: "rtnl_is_locked" [/home/sugarsun/public_git/rtl8188eu/8188eu.ko] undefined!
    s

• https://github.com/lwfinger/rtl8188eu/issues/200

• investigating

  • Compiling module gives MODPOST Error (Unknown Symbol) (linuxquestions.org)

  • https://all.rentafree.info/entry/962639

  • Can fixing the _OS_INTFS_FILES help?

• https://qiita.com/ikwzm/items/0aa165fa21fa9cca15c0 ???? related?

  • oops ARCH was a bit different..

    • → fix?

• Looks similar but no solution.

  • https://all.rentafree.info/entry/962639

• Seems https://github.com/lwfinger/rtl8188eu/tree/v5.2.2.4 actually Kernel build approach?

  • https://debimate.jp/2019/07/15/linux-kernel-tree%E5%86%85%E3%81%A7%E8%87%AA%E4%BD%9Ckernel%E3%83%A2%E3%82%B8%E3%83%A5%E3%83%BC%E3%83%AB%E3%82%92%E3%83%93%E3%83%AB%E3%83%89%E3%81%99%E3%82%8B%E6%96%B9%E6%B3%95makefile%E3%81%A8kconfi/

• Related… ? https://patchwork.kernel.org/project/linux-kbuild/patch/20171002105004.32426-1-jonas.gorski@gmail.com/

  • → YES!!

• misc:

  • SSL cert expiration error

    • https://stackoverflow.com/questions/26157895/ignore-ssl-certificate-error-with-wget

• and …. coming back to Brainux image building

  • seems it’s automated as https://github.com/brain-hackers/buildbrain#bootstrap-debian-11-bullseye

  • but it depends on https://packages.debian.org/bullseye/dosfstools ??

    • The following NEW packages will be installed:
        dosfstools
      0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
      Need to get 142 kB of archives.
      After this operation, 323 kB of additional disk space will be used.
      Get:1 http://deb.debian.org/debian bullseye/main amd64 dosfstools amd64 4.2-1 [142 kB]
      Fetched 142 kB in 1s (276 kB/s)
      Selecting previously unselected package dosfstools.
      (Reading database ... 37775 files and directories currently installed.)
      Preparing to unpack .../dosfstools_4.2-1_amd64.deb ...
      Unpacking dosfstools (4.2-1) ...
      Setting up dosfstools (4.2-1) ...
      Processing triggers for man-db (2.9.4-2) ...
      ----- 1. Brainux Image / https://wiki.brainux.org/linux/linux-build/
      ----- 2. rtl8188eu driver / https://github.com/lwfinger/rtl8188eu
      ----- Build phase.
      ----- 1-0. Patch Brainux
      

      It worked!!

  • make brainux issues…

    • + mkdir -p /etc/apt/keyrings
      + curl -fsSL https://packagecloud.io/brainhackers/brainux/gpgkey
      + gpg --dearmor
      curl: (77) error setting certificate verify locations:  CAfile: /etc/ssl/certs/ca-certificates.crt CApath: /etc/ssl/certs
      gpg: no valid OpenPGP data found.
      make: *** [Makefile:145: brainux] Error 2
      

    • So I retried with commenting out /debootstrap/debootstrap --second-stage` to continue the setup..

      • and insert

        • ### Haruki mod
          DEBIAN_FRONTEND=noninteractive \
              apt reinstall -y ca-certificates
          

        • https://askubuntu.com/questions/1390288/curl-77-error-setting-certificate-verify-locations-ubuntu-20-04-3-lts

Another option

• use some devices already included?

  • https://www.google.co.jp/search?q=RTL8192CU&btnI=i_love_im_feeling_lucky

  • https://www.iodata.jp/product/network/adp/wn-g300ua/