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针对Cool Pi 4B主板，如需更新u-boot操作如下：

0823版本请升级到0904

1. 下载0904版本bin文件
   uboot.zip

2. 解压zip，将bin文件拷贝到U盘或Tf卡根目录

3. 将U盘或Tf卡插入主板，连接Debug串口到PC电脑，打开串口终端工具，主板通电，连续输入大写CP中止u-boot自动启动

   备注：请注意U盘启动或升级仅支持插入USB3 下层端口

4. 在u-boot shell命令行窗口，
   针对串口输出信息如下的主板

COOLPI LOADER BY YANYI(Aug 23 2022)                                             
                                                                                
DRAM:  3.7 GiB                                                                  
CR: M/C/I                                                                       
Using default environment

A) 如果是从U盘导入文件升级步骤
usb reset
load usb 0:1 0x800000 uboot.img
mtd erase nor0 0x200000 0x500000
mtd write nor0 0x800000 0x200000 0x500000
擦除与写入过程请勿断电或重启

B) 如果是从TF卡导入文件升级步骤
mmc dev 1
load mmc 1:1 0x800000 uboot.img
mtd erase nor0 0x200000 0x500000
mtd write nor0 0x800000 0x200000 0x500000
擦除与写入过程请勿断电或重启

5. 等待执行完毕，确认无异常后，断电或reset即可。

6. 升级完成后，串口输出信息如下

COOLPI LOADER BY YANYI(Sep 03 2022)                                             
                                                                                
DRAM:  3.7 GiB                                                                  
Using default environment

后续的升级指令封装为
c update usb|tf|mmc

tf卡升级测试：
CPBOOT# v                                                                       
COOLPI LOADER BY YANYI(Sep 03 2022)                                             
                                                                                
aarch64-none-linux-gnu-gcc (GNU Toolchain for the A-profile Architecture 10.3-21
GNU ld (GNU Toolchain for the A-profile Architecture 10.3-2021.07 (arm-10.29)) 1
CPBOOT# c update tf                                                             
reading uboot.img                                                               
5242880 bytes read in 428 ms (11.7 MiB/s)                                       
wait for erase...                                                               
uboot upgrade ok...                                                             
CPBOOT# reset

u盘升级测试：
CPBOOT# v                                                                       
COOLPI LOADER BY YANYI(Sep 03 2022)                                             
                                                                                
aarch64-none-linux-gnu-gcc (GNU Toolchain for the A-profile Architecture 10.3-21
GNU ld (GNU Toolchain for the A-profile Architecture 10.3-2021.07 (arm-10.29)) 1
CPBOOT# c update usb                                                            
resetting USB...                                                                
Bus usb@fc880000: USB EHCI 1.00                                                 
scanning bus usb@fc880000 for devices... 2 USB Device(s) found                  
       scanning usb for storage devices... 1 Storage Device(s) found            
reading uboot.img                                                               
5242880 bytes read in 363 ms (13.8 MiB/s)                                       
wait for erase...                                                               
uboot upgrade ok...                                                             
CPBOOT# reset
备注：请注意U盘启动或升级仅支持插入USB3 下层端口

RKDevTool_Release_v2.92_loader0104.zip

You can try refuse loader program and check if display coolpi logo.

1. 串口引脚说明

40PIN引脚，其中第8、10、14引脚信号分别对应TXD RXD GND，3.3V TTL电平，请连接到USB转TTL模块上。
如下图：

图中标号1连接GND
图中标号2连接USB串口模块TXD
图中标号3连接USB串口模块RXD

上图中40 pin排母功能定义如下表（图中左下为编号1，左上为编号2，右下为编号39，右上为编号40）

2. 串口工具putty

串口工具不限，附件仅作为参考使用
putty.zip

电脑串口工具设置串口波特率115200，8比特数据位，1个停止位，无校验，关闭流控。
putty串口工具配置参考

@retroman
also use onedrive link(https://1drv.ms/u/s!AhSBNZjrDPlSanDDQF7WowYhiz8?e=lRpMrk). And then the top u3 port is used for adb debug.

Debian11

流程操作体验，视频硬解码，简洁桌面xfce

终端命令行清晰可见

谷歌浏览器轻松访问

B站视频内容尽享

高清视频解码

宝塔是什么，可以查看demo页面

apt-get install wget curl

wget -O install.sh http://download.bt.cn/install/install-ubuntu_6.0.sh

sudo bash install.sh

安装成功后，保存账户信息用于内网面板登陆

==================================================================
Congratulations! Installed successfully!
==================================================================
外网面板地址: http://xxx.226.28.51:8888/dc404f6c
内网面板地址: http://192.168.3.xx:8888/dc404f6c
username: xxxx
password: xxxx
If you cannot access the panel,
release the following panel port [8888] in the security group
若无法访问面板，请检查防火墙/安全组是否有放行面板[8888]端口
==================================================================
Time consumed: 9 Minute!
ubuntu@coolpi:~$

Debian11 & Ubuntu image for coolpi 4b

Onedrive

https://www.cool-pi.com/topic/126/coolpi-4b-镜像固件离线刷机方法

https://www.cool-pi.com/topic/127/coolpi-4b-镜像固件在线刷机方法

在Cool Pi Model 4主板上，安装统信UOS系统，体验流畅，画质清晰。

基于Coolpi 4B搭建流行的gitlab服务器，一步到位。
gitlab_install.sh

ubuntu@coolpi:~$ ./gitlab_install.sh 
libcurl4 was already not on hold.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
curl is already the newest version (7.81.0-1ubuntu1.6).
0 upgraded, 0 newly installed, 0 to remove and 230 not upgraded.
Detected operating system as Ubuntu/jammy.
Checking for curl...
Detected curl...
Checking for gpg...
Detected gpg...
Running apt-get update... done.
Installing apt-transport-https... done.
Installing /etc/apt/sources.list.d/gitlab_gitlab-ce.list...done.
Importing packagecloud gpg key... done.
Running apt-get update... done.

The repository is setup! You can now install packages.
ubuntu@coolpi:~$ 

选择你需要的版本，安装它

ubuntu@coolpi:~$ sudo apt install gitlab-ce=15.6.0-ce.0
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following NEW packages will be installed:
  gitlab-ce
0 upgraded, 1 newly installed, 0 to remove and 230 not upgraded.
Need to get 1,148 MB of archives.
After this operation, 3,869 MB of additional disk space will be used.
Get:1 https://packages.gitlab.com/gitlab/gitlab-ce/ubuntu jammy/main arm64 gitlab-ce arm64 15.6.0-ce.0 [1,148 MB]
Fetched 1,148 MB in 1min 10s (16.3 MB/s)                                       
Selecting previously unselected package gitlab-ce.
(Reading database ... 148928 files and directories currently installed.)
Preparing to unpack .../gitlab-ce_15.6.0-ce.0_arm64.deb ...
Unpacking gitlab-ce (15.6.0-ce.0) ...
Setting up gitlab-ce (15.6.0-ce.0) ...
It looks like GitLab has not been configured yet; skipping the upgrade script.

       *.                  *.
      ***                 ***
     *****               *****
    .******             *******
    ********            ********
   ,,,,,,,,,***********,,,,,,,,,
  ,,,,,,,,,,,*********,,,,,,,,,,,
  .,,,,,,,,,,,*******,,,,,,,,,,,,
      ,,,,,,,,,*****,,,,,,,,,.
         ,,,,,,,****,,,,,,
            .,,,***,,,,
                ,*,.
  


     _______ __  __          __
    / ____(_) /_/ /   ____ _/ /_
   / / __/ / __/ /   / __ `/ __ \
  / /_/ / / /_/ /___/ /_/ / /_/ /
  \____/_/\__/_____/\__,_/_.___/
  

Thank you for installing GitLab!
GitLab was unable to detect a valid hostname for your instance.
Please configure a URL for your GitLab instance by setting `external_url`
configuration in /etc/gitlab/gitlab.rb file.
Then, you can start your GitLab instance by running the following command:
  sudo gitlab-ctl reconfigure

For a comprehensive list of configuration options please see the Omnibus GitLab 
readme
https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/README.md

Help us improve the installation experience, let us know how we did with a 1 min
ute survey:
https://gitlab.fra1.qualtrics.com/jfe/form/SV_6kVqZANThUQ1bZb?installation=omnib
us&release=15-6

ubuntu@coolpi:~$

修改默认配置文件，重新部署初始化配置

ubuntu@coolpi:~$ sudo vim /etc/gitlab/gitlab.rb
...
#external_url 'http://gitlab.example.com'
external_url 'http://192.168.1.172'
...

ubuntu@coolpi:~$ sudo gitlab-ctl reconfigure
...
Notes:
Default admin account has been configured with following details:
Username: root
Password: You didn't opt-in to print initial root password to STDOUT.
Password stored to /etc/gitlab/initial_root_password. This file will be cleaned up in first reconfigure run after 24 hours.

NOTE: Because these credentials might be present in your log files in plain text, it is highly recommended to reset the password following https://docs.gitlab.com/ee/security/reset_user_password.html#reset-your-root-password.

gitlab Reconfigured!

初始root用户密码请查看文件

ubuntu@coolpi:~$ sudo cat /etc/gitlab/initial_root_password
[sudo] password for ubuntu: 
# WARNING: This value is valid only in the following conditions
#          1. If provided manually (either via `GITLAB_ROOT_PASSWORD` environment variable or via `gitlab_rails['initial_root_password']` setting in `gitlab.rb`, it was provided before database was seeded for the first time (usually, the first reconfigure run).
#          2. Password hasn't been changed manually, either via UI or via command line.
#
#          If the password shown here doesn't work, you must reset the admin password following https://docs.gitlab.com/ee/security/reset_user_password.html#reset-your-root-password.

Password: HQQY3tBsOGOW2jd2gmiLDROf3fEnKH8CW3ZFnikPlHg=

# NOTE: This file will be automatically deleted in the first reconfigure run after 24 hours.

浏览器访问http://localhost 或者 http://192.168.1.172

用户基于我们发布是镜像系统，安装软件或进行其他配置之后，如果想备份系统，有很多方法可以实现，我这里提供一个比较简单的思路供大家参考。

前置条件：

1. 假如您手边有一张已经做好系统的TF卡
2. 各种改动后的EMMC系统

核心操作步骤：

1. 从EMMC启动系统，登陆桌面并打开终端命令行更改卷标

sudo su
fatlabel /dev/mmcblk0p1 emmc-boot
e2label /dev/mmcblk0p2 emmc-rootfs

vim /boot/firmware/cmdline.txt
将writable替换为emmc-rootfs  然后保存退出

vim /etc/fstab
将writable替换为emmc-rootfs  然后保存退出

sync;

2. 插入TF卡，重启系统

3. 默认优先从TF卡引导系统，进入系统之后，可以挂载EMMC分区进行备份压缩

环境补充安装：

sudo ln -sf /usr/bin/python2 /usr/bin/python
sudo apt install flex bison

可选执行

sudo dpkg-reconfigure dash

（注意弹框选择No）

测试代码下载与编译

ubuntu@coolpi:~$ mkdir test
ubuntu@coolpi:~$ cd test/
ubuntu@coolpi:~/test$ git clone https://gitee.com/yanyitech/coolpi-kernel.git
正克隆到 'coolpi-kernel'...
remote: Enumerating objects: 88605, done.
remote: Counting objects: 100% (88605/88605), done.
remote: Compressing objects: 100% (75148/75148), done.

...

查看远程仓库

ubuntu@coolpi:~/test/$ git remote -v
origin	https://gitee.com/yanyitech/coolpi-kernel.git (fetch)
origin	https://gitee.com/yanyitech/coolpi-kernel.git (push)

编译

ubuntu@coolpi:~/test/$ ./build-kernel.sh

修改内核配置

ubuntu@coolpi:~/test/$ make ARCH=arm64 menuconfig

@retroman
hi, thanks for your advice. This work will be long and continue. We need more community friends to participate.

Sometimes we may need to customize the logo display. We just need to copy logo bmp files to first partition of tf-card or emmc. Two logo files can be the same.

It should be noted that uboot must be upgraded to the latest.
uboot-20230222.zip

Ubuntu 22.04.1 LTS coolpi ttyS0

coolpi login: coolpi
Password: 
Welcome to Ubuntu 22.04.1 LTS (GNU/Linux 5.10.110 aarch64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

This system has been minimized by removing packages and content that are
not required on a system that users do not log into.

To restore this content, you can run the 'unminimize' command.

56 updates can be applied immediately.
27 of these updates are standard security updates.
To see these additional updates run: apt list --upgradable


The list of available updates is more than a week old.
To check for new updates run: sudo apt update
Last login: Wed Feb 22 06:11:20 UTC 2023 on ttyS0
coolpi@coolpi:~$ sudo cp logo.bmp logo_kernel.bmp /boot/firmware/
[sudo] password for coolpi: 
coolpi@coolpi:~$ sudo reboot

使用1017镜像版本，需要额外执行如下指令完成环境搭建

sudo su
apt-mark unhold libssl1.1 libdpkg-perl libc-dev-bin libc6 libc6-dev
apt update
apt install gcc make git python libncurses5-dev openssl libssl-dev build-essential pkg-config libc6-dev bison flex

下载内核本地编译

mkdir test;cd test
git clone https://gitee.com/yanyitech/coolpi-kernel.git
cd coolpi-kernel
./build-kernel.sh
编译完成，在out目录生成内核二进制文件、设备树以及驱动包
coolpi@coolpi:~/test/coolpi-kernel$ ls -lh out/
total 150M
-rw-r--r-- 1 coolpi coolpi 137M 10月 17 13:33 modules.tar.gz
-rw-r--r-- 1 coolpi coolpi 137K 10月 17 13:33 rk3588s-cp4.dtb
-rw-r--r-- 1 coolpi coolpi  13M 10月 17 13:33 vmlinuz


查看当前磁盘挂载状态
coolpi@coolpi:~/test/coolpi-kernel$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            1.9G  8.0K  1.9G   1% /dev
tmpfs           373M  1.5M  371M   1% /run
/dev/mmcblk2p2   29G   12G   16G  44% /
tmpfs           1.9G  209M  1.7G  12% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
/dev/mmcblk2p1  300M   27M  273M   9% /boot/firmware
tmpfs           373M   32K  373M   1% /run/user/1000

根据需要进行内核文件替换更新
coolpi@coolpi:~/test/coolpi-kernel$ ls -l /boot/firmware/
total 27084
-rwxr-xr-x 1 root root      176  1月  1  2021 cmdline.txt
-rwxr-xr-x 1 root root       64  8月 31 09:25 config.txt
-rwxr-xr-x 1 root root  8775086  8月 31 09:25 initrd.img
-rwxr-xr-x 1 root root  8128296 10月 17 11:11 modules.tar.gz
-rwxr-xr-x 1 root root   139847 10月 17 11:11 rk3588s-cp4.dtb
-rwxr-xr-x 1 root root 10673011 10月 17 11:11 vmlinuz
coolpi@coolpi:~/test/coolpi-kernel$

Debian或Ubuntu镜像使用离线刷机方法，镜像写入完成后，在system-boot分区根目录，新建文件wifi.txt，内容参考如下：

ssid="你要连接的wifi名"
passwd="wifi密码"

插上TF到CoolPi主板，自动连接Wifi

Basic system for ubuntu server.

链接: https://pan.baidu.com/s/17hNy8o6hUv7p4M5ruOIpuA
提取码: w00w

user: ubuntu
passwd: coolpi

Console串口登陆

网络ssh远程登陆

@Mcfly
内核和系统应用不用额外操作。先试下有没有改善，我们目前没有相应的U3相机验证，帮忙排查下，谢谢！

Ubuntu22 原生系统测试版

Download link: 百度网盘 OneDrive

刷机操作请参考：
https://www.cool-pi.com/topic/126/coolpi-4b-镜像固件离线刷机方法

https://www.cool-pi.com/topic/127/coolpi-4b-镜像固件在线刷机方法