Godson 2nd generation burn PMON and reload system

Problem description

Originally, I just turned on and couldn't enter the operating system , It was not clear at that time PMON What's the function , Think with Ubuntu Under the tty0 almost , Accidentally deleted during the process of entering the command line PMON, From then on, the development board becomes brick .

At that time, I said this question to the technicians in despair , The kind Mr. long sent me his EJTAG, So there is the next burning PMON And the process of reinstalling the system .

burning PMON

Environmental Science

Environmental Science	explain
operating system	Ubuntu 20.04

Burning process

according to 《 Godson Ejtag Brief introduction 》 Burn ：

1. download ejtag Software

   Because the official website provided in the document has expired , So I really csdn I found one on the Internet ejtag-debug-v3.25.19.tar.gz Download address ：https://download.csdn.net/download/xiaolong1126626497/18927988

2. I will download ejtag-debug-v3.25.19.tar.gz It's decompressed Ubuntud Of ~/Download

   tar zxvf ejtag-debug-v3.25.19.tar.gz
   

   Then go to cd /ejtag_debug

3. Then download pmon, Will download pmon It's all in /tmp/ Under the folder

   PMON	link	Failure / Success shows
   gzrom.bin	http://ftp.loongnix.cn/embedd/ls2k/	After downloading this, you can't boot , Feeling is ls1b model
   gzrom4g.bin	http://ftp.loongnix.cn/embedd/ls2k/	After downloading this, you can't boot
   gzrom-2h3a300m.bin	http://ftp.loongnix.cn/embedd/others/zd/	ditto
   ️gzrom-dtb.bin	http://ftp.loongnix.cn/loongsonpi/pi_2/source/	Longxin school 2 Generation exclusive PMON
   pmon-ls2k.bin		It can be turned on , But the system cannot be reinstalled , I feel it is suitable for education

   The following is the picture of unable to reinstall the system , Will be stuck here all the time ：

   

4. The simulator USB End to Ubuntu On , The other section connects the development board in the way shown in the figure , Connect the development board to the power supply

   
   

5. Burn

   sudo ./ejtag_debug_usb -t
   source configs/config.ls2k
   program_cachelock /tmp/gzrom-dtb.bin  # pmon The path of 
   

6. After writing the command , Press the start key or restart key on the development board , Start burning , Wait until the terminal stops , Press the restart key on the development board .

Reshipment system

Download mirroring

Downloaded image	link	explain
loongnix-20180531.iso	http://ftp.loongnix.cn/embedd/os/
️loongnix-1.0-2005-livecd.iso	http://ftp.loongnix.cn/loongsonpi/pi_2/OS/Loongnix/	This image is installed
loongbian_buster_ls2k_base_20201220.iso	loongbian_buster_ls2k_base_20201220.iso

Make the startup disk

According to this blog Godson education school started from scratch （ One ）—— Production starts U disc 、 Turn on SSH service 、 download Loongpio library use UltraISO Failed to create startup disk ,U After disc insertion PMON I can't recognize , So only in Ubuntu Next, make a startup disk .

1. Download the image to Ubuntu In a directory of , such as ~/loongson, The first thing to do is to create loongson The catalog of

2. Switch to the directory cd ~/loongson

3. Insert a greater than 4G Of U Disk as a startup disk ,U The contents of the disk will be formatted , So it's better to be empty U disc

4. Input... At the terminal sudo fdisk -l find U The device symbol corresponding to the disk , For example, if the system comes with a hard disk , It's usually /dev/sda, Insert a U disc , The corresponding is /dev/sdb 了 , This must not be mistaken .

5. Enter the following command at the terminal to start making the startup disk ：

   sudo dd if=xxx.ios of=dev/sdy    # xxx Represents the installation disk ios Image file path ,y On behalf of U Device symbol of disk 
    Such as ：sudo dd if=loongnix-1.0-2005-livecd.iso   of=dev/sdb
   #  After entering the above command , The terminal will react nothing , It will take about ten to twenty minutes , There will be a prompt that the burning is complete or something wrong happens 
   sync  #  Better input sync
   

6. Then insert the startup disk into the development board

   There could be catons , Just wait patiently , For specific installation operations, please refer to 《Loongnix-1.0.2003 Installation manual 》

   Or reference video Godson TechLive The first phase ： install Loongnix System

   ps： I partition according to the method in the video , As soon as I start up, I say I don't have enough disk space ; Another problem is that I have insufficient authority , Therefore, it is still installed according to the way in the document .

Reference link
The embedded Linux Development : Godson 2K1000 Use EJTAG burning POPM： Burned PMON There is a problem , But the steps are not wrong
Godson education school started from scratch （ One ）—— Production starts U disc 、 Turn on SSH service 、 download Loongpio library ： This blogger uses the education school , I don't know PMON Dissimilarity , The system disk burned according to his method cannot be read
Godson TechLive The first phase ： install Loongnix System ： amusing up Lord , But there is a problem with the system at the end of the operation according to his steps .

in addition
I packed the tools and files mentioned in the article into my resources .