OKMX6UL Development Board Debian Filesystem Creation Process (Including Tool Installation, Configuration, and Burning)

This article describes how to create a Debian filesystem for the OKMX6UL series development boards, primarily applicable to the Forlinx OKMX6UL series with the Linux 4.1.15 operating system. Other platforms can refer to this guide, but there will be differences between platforms, which need to be modified to suit the actual use.

Note: Operate under the root user by default.

1. Qemu and Debootstrap Installation Since a Debian file system is built on Ubuntu apt- these two tools can be installed directly using the apt-get command. The commands are as follows:

sudo apt-get install binfmt-support qemu qemu-user-static debootstrap

1. Extracting Debian File System Use the debootstrap command to extract the file system. Execute the following command to retrieve the file system from the Debian download source:

mkdir /home/forlinx/debian
sudo debootstrap --arch=armhf --foreign buster root https://mirrors.tuna.tsinghua.edu.cn/debian/
Explanation of command parameters:

arch specifies the CPU architecture

buster is the Debian version number. Currently, the latest version is 10

foreign: This parameter needs to be specified when the architecture is different from the host’s, used only for the initial unpacking

root: The folder where the filesystem will be stored

https://mirrors.tuna.tsinghua.edu.cn/debian/ is the download source.

The extraction process takes a relatively long time, approximately 10 minutes. Please be patient. Once successful, the Linux directory structure can be seen. If the extraction fails, please try a few more times or change the network:

1. Improving the File System To improve the filesystem, the qemu is required. Since it is operating on an X86 virtual machine, the ARM filesystem can not be improved directly. Therefore, qemu is used to simulate an ARM environment.

a.To copy qemu-arm-static into the newly built base system, use the following command:
cd root
sudo cp /usr/bin/qemu-arm-static usr/bin
cd ..
b.Initialize the file system.
Execute the following command:

sudo DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true LC_ALL=C LANGUAGE=C LANG=C chroot root debootstrap/debootstrap --second-stage
c.Use the chroot root command to initialize file system
chroot root
d.Use the command to create the following
echo "proc /proc proc defaults 0 0" >> etc/fstab
mkdir -p usr/share/man/man1/
mknod dev/console c 5 1
e.Download Source Update
Use the command vi /etc/apt/sources.list to open the source.list file and replace the contents with the following.

deb http://mirrors.ustc.edu.cn/debian stable main contrib non-free

deb-src http://mirrors.ustc.edu.cn/debian stable main contrib non-free

deb http://mirrors.ustc.edu.cn/debian stable-updates main contrib non-free

deb-src http://mirrors.ustc.edu.cn/debian stable-updates main contrib non-free

deb http://mirrors.ustc.edu.cn/debian stable-proposed-updates main contrib non-free

deb-src http://mirrors.ustc.edu.cn/debian stable-proposed-updates main contrib non-free

Then save and exit, and use the command apt-get update to update the download source. When the update download source reports an error, the date command can be provided to modify the system time to solve the problem.

apt-get update

f.Use the command apt-get install vim to install some necessary software
apt-get install vim
apt-get install sudo
apt-get install dpkg
apt-get install bzip2
apt-get install net-tools
apt-get install ntpdate
apt-get install gcc
g.Create a new user with the command adduser forlinx, then enter the password
adduser forlinx
h.Set the root password, use the command passwd root, and set the password to forlinx.
passwd root
i.To set up Ethernet, enter the following command:
vi /etc/network/interfaces
As follows:

/etc/network/interfaces -- configuration file for ifup(8), ifdown(8)

The loopback interface

auto lo
iface lo inet loopback

Wireless interfaces

iface wlan0 inet dhcp
wireless_mode managed
wireless_essid any
wpa-driver wext
wpa-conf /etc/wpa_supplicant.conf
iface atml0 inet dhcp

Wired or wireless interfaces

auto eth0

iface eth0 inet dhcp

iface eth1 inet dhcp

iface eth0 inet static
address 192.168.0.232
netmask 255.255.255.0
gateway 192.168.0.1
broadcast 192.168.0.255
auto eth1
iface eth1 inet static
address 192.168.1.232
netmask 255.255.255.0
gateway 192.168.1.1
broadcast 192.168.1.255

Ethernet/RNDIS gadget (g_ether)

... or on host side, usbnet and random hwaddr

iface usb0 inet static
address 192.168.7.2
netmask 255.255.255.0
network 192.168.7.0
gateway 192.168.7.1

Bluetooth networking

iface bnep0 inet dhcp
j.Modify host name
vi /etc/hostname
Modify to: Debian
k.Modify the system time zone
cp /usr/share/zoneinfo/Hongkong /etc/localtime
ntpdate ntp.aliyun.com
Take East Zone 8 as an example, other time zone files are also included under this path.
l.Configure the SSH service
Install and enable SSH

root@Debian:~# apt-get install ssh
root@Debian:~# service ssh start
Allow SSH login for root user

root@Debian:~# vim /etc/ssh/sshd_config
Find this line. If there is no comment, it needs to be commented out with:

PermitRootLogin prohibit-password

Create a new line

PermitRootLogin yes
Re-enable SSH

root@Debian:~# service ssh restart
m.Configure the FTP service
Install vsftpd

root@Debian:~# apt-get install vsftpd
After the installation is complete, run the following command in a terminal to check the version of the vsftpd package:

root@Debian:~# systemctl status vsftpd
Configure the FTP service

root@Debian:~# cp /etc/vsftpd.conf /etc/vsftpd.conf.bak
root@Debian:~# vi /etc/vsftpd.conf
Use these values to add/modify the following options:

write_enable=YES
chroot_local_user=YES
allow_writeable_chroot=YES
local_root=/
Allow login for root user

root@Debian:~# vi /etc/ftpusers
Users in ftpusers can not log in via FTP, so please comment out root with #.

root

Re-enable FTP

root@Debian:~# systemctl restart vsftpd
Safety Instructions
The configuration of vsftpd is extensive, but this article only covers a small portion. The FTP configuration file is located at: /etc/vsftpd.conf.
When connecting to the device using the Filezilla tool, please select the FTP protocol and choose the encryption method as "Only use plain FTP".
When connecting using the WinSCP tool, please select the FTP protocol and choose the encryption method as "Not encrypted".
n.Adapt WiFi module
(1) Install the necessary commands

root@Debian:~# apt-get install usbutils //lsusb
root@Debian:~# apt-get install wpasupplicant //wpa_supplicant
root@Debian:~# apt-get install udhcpc
(2) lsusb to see if a WiFi device has been found

root@Debian:~# lsusb
Bus 001 Device 003: ID 0bda:d723 Realtek Semiconductor Corp. 802.11n WLAN Adapter
Bus 001 Device 002: ID 0424:2514 Microchip Technology, Inc. (formerly SMSC) USB 2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
0bda:d723 is the ID of 8723du

(3) Check if the driver is loaded

root@Debian:~# lsmod
Module Size Used by
8723du 1302499 0
mx6s_capture 14876 0
ov9650_camera 12446 0
evbug 1882 0
configfs 23785 1
(4) Set to use bash script by default

Place the fltest_wifi.sh script in the /usr/bin path. Since the Debian filesystem uses dash instead of the traditional bash, running the shell script directly will result in a syntax error report, so please eliminate the dash.

root@Debian:~# dpkg-reconfigure dash
Select NO in the pop-up window, after which it can run the shell script normally.

Note: If Don’t make the above changes, the bash + shell script also can be used, for example:

root@Debian:~# bash fltest_wifi.sh
(5) Modify udev rules

cp /lib/udev/rules.d/80-net-setup-link.rules /etc/udev/rules.d/
vim /etc/udev/rules.d/80-net-setup-link.rules
Amend line 11 to read:
NAME=="", ENV{ID_NET_NAME}!="", NAME="$env{ID_NET_SLOT}"
Note: If don’t make the above changes, wlan0 will be renamed, resulting in networking failure.
(6) Connect WiFi

Note: 1. The WiFi connection script needs to be copied from the file system provided by Forlinx;

1. To avoid routing table conflicts, down eth0 and eth1 before connecting to WiFi.

ifconfig eth0 down
ifconfig eth1 down
fltest_cmd_wifi.sh -i 8723du -s forlinx-wlan -p fl03123102650
o.Install pyqt
(1) python Installation

sudo apt-get -y install python3-pip python3
(2) PyQt5 Installation

sudo apt-get -y install python3-pyqt5
(3) Because the performance of 6ull is relatively weak, there is no desktop installed, just use exit to exit the qemu environment.

exit
(4) Package the file system

Go to the Debian filesystem directory Directly use the command tar -cjf rootfs.tar.bz2 ./*.

tar -cjvf rootfs.tar.bz2 ./*
(5) Burn-in verification

Place the packaged file system into the burner, while keeping the other images as they are and only replacing the file system. Then proceed with the burn-in test.