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Loongson-2f-Install-Debian

My experience to install Debian on loongson-2f
ref. https://wiki.debian.org/DebianYeeloong/HowTo/Install

Hardware

I bought a Lemote YeeLoong 8089D with CNY279 at Oct. 23rd, year 2013.

Netboot Files

Download netboot files:
Wheezy (Debian 7.11) : http://ftp.debian.org/debian/dists/wheezy/main/installer-mipsel/current/images/loongson-2f/netboot/
http://archive.debian.org/debian-archive/debian/dists/wheezy/main/installer-mipsel/current/images/loongson-2f/netboot/ You will find the following files:

Name                          Last modified       Size
boot.cfg                      2016-05-30 23:04    129
initrd.gz                     2016-05-30 23:04    5.0M
vmlinux-3.2.0-4-loongson-2f   2016-05-30 23:04    7.9M

or Jessie (Debian 8.9) : http://ftp.debian.org/debian/dists/jessie/main/installer-mipsel/current/images/loongson-2f/netboot/
I choose Jessie :-)
UPDATE: Now moved to : http://archive.debian.org/debian-archive/debian/dists/jessie/main/installer-mipsel/current/images/loongson-2f/netboot/

I have downloaded the following files:

Name	                           Last modified	       Size
boot.cfg                          2018-06-19 09:20      130
initrd.gz                         2018-06-19 09:20      12M
vmlinux-3.16.0-6-loongson-2f      2018-06-19 09:20      11M

NOTE Unfortunately Debian dropped images for loongson-2f. https://lists.debian.org/debian-devel-announce/2016/07/msg00000.html

TFTP Server

Run tftpd32 (http://tftpd32.jounin.net/) on my windows 10 computer, and point 'current folder' to where netboot files saves. Connect YeeLoong with ehternet cable into the same LAN with TFTP server.

By the way, a fast and stable internet is also very important, especially if you are in China.

Boot from TFTP server

Press DEL (repeatedly) on startup to enter PMON (the Yeeloong's BIOS);
Delete any extra characters;
Type:

PMON> ifaddr rtl0 192.168.0.bb
PMON> load tftp://192.168.0.aa/vmlinux-3.16.0-4-loongson-2f
PMON> initrd tftp://192.168.0.aa/initrd.gz
PMON> g

Here 192.168.0.bb is IP address of YeeLoong laptop. Mind the letter 'l' and numerical '0' in 'rtl0'.
192.168.0.aa is the IP of TFTP server (my win 10 laptop).

Installation

It is safe to close TFTP server after system boot, though of no harm to keep it open.
Not much special during system installation.

I partited the harddrive (8.2 GiB) into three partitions. /boot must be ext2.

/boot  ext2  100M
/      ext4  7G
       swap  1.1G

I selected Debian Desktop Enviroment and LXDE at TaskSel but I will disable GUI after installation. It is also a good choice to not install X-Desktop.

Post Installation

Unable to start X-Desktop at first boot. Remove xserver-xorg-video-siliconmotion can currently solve the problem.
Press ALT+F1 to switch to text mode / shell.

su -                 # switch to root to enable sudo for current user
apt install sudo
echo '${USER}  ALL=(ALL:ALL) ALL' >> /etc/sudoers
exit                 # switch back to current user

# Remove Siliconmotion to fix GUI failure
sudo apt purge xserver-xorg-video-siliconmotion

More setup

# Install NTP and setup timezone
sudo apt install ntp
echo "Asia/Shanghai" > /etc/timezone && dpkg-reconfigure -f noninteractive tzdata
# change "Asia/Shanghai" into your own timezone unless you are also in China. 
date

# Some software
sudo apt install vim mc byobu

# Default boot into text mode 
sudo systemctl set-default multi-user.target

# Start X-Desktop from shell
sudo systemctl start ligthdm

# Log out X-Desktop and free up memory
sudo systemctl stop lightdm
sync && echo 3 | sudo tee /proc/sys/vm/drop_caches

Patch a new kernel

https://github.com/biergaizi/loongson-sources
DO NOT patch this kernel to Debian Wheezy.

cd /tmp
wget https://github.com/biergaizi/loongson-sources/releases/download/v3.16.4/linux-3.16.4-yeeloong-gaizi.tar.xz 
tar xf linux-3.16.4-yeeloong-gaizi.tar.xz
sudo cp -r 3.16.4-yeeloong-gaizi/boot/* /boot
sudo cp -r 3.16.4-yeeloong-gaizi/lib/* /lib
sudo update-grub
sudo reboot

Cooling down fan speed

ref. https://romanrm.net/loongson/yeeloong-fan

sudo apt install lm-sensors 
sensors
sudo apt install thinkfan
sudo systemctl stop thinkfan.service
sudo cp /etc/thinkfan.conf{,.bak}
cat << EOL | sudo tee /etc/thinkfan.conf
sensor /sys/devices/virtual/hwmon/hwmon0/temp1_input
fan /sys/class/hwmon/hwmon0/pwm1
(0, 0, 62)
(1, 60, 64)
(2, 62, 66)
(3, 64, 32767)
# The format of the threshold lines is (fan step, temperature on which to step down, temperature on which to step up).
EOL
sudo systemctl start thinkfan.service

The fan will almost always quite.

Debian Wheezy (7.x) X-Desktop fix

sudo apt remove xserver-xorg-video-siliconmotion
wget --no-check-certificate https://www.anheng.com.cn/loongson2f/wheezy/xserver-xorg-video-siliconmotion/xserver-xorg-video-siliconmotion_1.7.6-1loongson_mipsel.deb
sudo dpkg -i xserver-xorg-video-siliconmotion_1.7.6-1loongson_mipsel.deb

cat << EOL | sudo tee /etc/X11/xorg.conf
# xorg.conf (X.Org X Window System server configuration file)  
#  
# This file was generated by dexconf, the Debian X Configuration tool, using  
# values from the debconf database.  
#  
# Edit this file with caution, and see the xorg.conf manual page.  
# (Type "man xorg.conf" at the shell prompt.)  
#  
# This file is automatically updated on xserver-xorg package upgrades *only*  
# if it has not been modified since the last upgrade of the xserver-xorg  
# package.  
#  
# If you have edited this file but would like it to be automatically updated  
# again, run the following command:  
#   sudo dpkg-reconfigure -phigh xserver-xorg  
  
Section "Device"  
        Identifier      "Card0"  
        Driver          "siliconmotion"  
        Option          "pci_burst" "true"  
        Option          "HWCursor" "true"  
        Option          "VideoKey" "45000"  
        Option          "UseBIOS" "false"  
        Option          "PanelSize" "1024x600"  
        Option          "CSCVideo" "false"  
EndSection  
  
Section "Screen"  
        Identifier      "Screen0"  
        Device          "Card0"  
        Monitor         "Monitor0"  
        DefaultDepth    16  
EndSection  
EOF

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My experience to install Debian on loongson-2f

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